JP6857764B2 - Detection device and display device - Google Patents

Description

The present invention relates to a detection device and a display device.

In a display device, there is a demand for detecting a touch operation on a display surface and also detecting a pressure or pressure applied to the display surface due to the touch operation. As a simple method for satisfying such a demand, a method of providing both a touch sensor for detecting a touch operation on a display surface of a display device and a pressure sensor for detecting a pressure on the display surface is known (for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2013-186501

However, the touch sensor and the pressure sensor require a space for arranging the parts, wiring, etc. for each configuration, and cause restrictions on the arrangement of the components, wiring, etc. of other configurations. Therefore, simply providing the configuration of both the existing touch sensor and the pressure sensor in one device increases the difficulty of design. Even if the design can be done, it is inevitable that the cost will increase due to the provision of dedicated parts for each configuration.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a detection device and a display device capable of detecting pressure in a configuration integrated with parts used in other configurations.

The detection device according to one aspect of the present invention includes a plurality of touch detection electrodes provided along the touch detection surface, a plurality of strain gauges, a detection circuit, a plurality of first wires, and a plurality of second wires. Each of the plurality of first wirings is connected to a first end portion of the touch detection electrode connected to the corresponding touch detection electrode and one end of the plurality of strain gauges corresponding to the corresponding strain gauge. The third end is provided so that each of the plurality of second wires corresponds to each of the plurality of first wires, and is connected to the other end of the corresponding strain gauge. The detection circuit includes a portion and a fourth end portion connected to the detection circuit, and the detection circuit applies a pressure received by the touch detection surface based on an electric resistance between the second end portion and the fourth end portion. To detect.

The display device according to one aspect of the present invention is a display device including a display panel for displaying an image and a detection unit, and the detection unit is a touch detection provided so as to cover a display surface of the image by the display panel. A plurality of touch detection electrodes provided along the surface, a plurality of strain gauges, a detection circuit, a plurality of first wirings, and a plurality of second wirings are provided, and each of the plurality of first wirings is provided. The plurality of touch detection electrodes include a first end portion connected to the corresponding touch detection electrode and a second end portion of the plurality of strain gauges connected to one end of the corresponding strain gauge. Each of the second wires is provided so as to correspond to each of the plurality of first wires, and has a third end connected to the other end of the corresponding strain gauge and a fourth wire connected to the detection circuit. The detection circuit includes an end portion and detects the pressure received by the touch detection surface based on the electric resistance between the second end portion and the fourth end portion.

FIG. 1 is a block diagram showing a configuration example of a display device with a touch detection function according to the first embodiment. FIG. 2 is an explanatory diagram showing a state in which the fingers are not in contact with or close to each other in order to explain the basic principle of the capacitive touch detection method. FIG. 3 is an explanatory diagram showing an example of an equivalent circuit in a state where the fingers shown in FIG. 2 are not in contact with or close to each other. FIG. 4 is a diagram showing an example of waveforms of a drive signal and a touch detection signal. FIG. 5 is a diagram showing an example of a module in which a display device with a touch detection function is mounted. FIG. 6 is a cross-sectional view showing a schematic cross-sectional structure of the display device with a touch detection function according to the first embodiment. FIG. 7 is a circuit diagram showing a pixel arrangement of the display device with a touch detection function according to the first embodiment. FIG. 8 is a perspective view showing a configuration example of a drive electrode and a touch detection electrode of the display device with a touch detection function according to the first embodiment. FIG. 9 is a schematic wiring diagram showing an arrangement example of a pressure detection unit provided in a display device with a touch detection function. FIG. 10 is a diagram showing an example of a specific configuration in the vicinity of the pressure detection unit and the pressure detection unit. FIG. 11 is a diagram showing an example of a specific configuration in the vicinity of the pressure detection unit and the pressure detection unit. FIG. 12 is a block diagram showing an example of a functional configuration of a circuit related to pressure detection. FIG. 13 is a timing chart schematically showing the relationship between the display drive timing, the touch detection timing, and the pressure detection timing in the display device with the touch detection function. FIG. 14 is a block diagram showing another example of the functional configuration of the circuit related to pressure detection. FIG. 15 is a timing chart schematically showing the relationship between the display drive timing, the touch detection timing, and the pressure detection timing when touch detection and pressure detection are performed in parallel during the same period. FIG. 16 is a block diagram showing an example of a functional configuration of a circuit related to pressure detection when touch detection and pressure detection are performed in parallel during the same period. FIG. 17 is a diagram showing an example of the relationship between the voltage waveform of the pulse output from the voltage application circuit, the output of the amplifier, and the output of the comparator according to the output of the amplifier. FIG. 18 is a diagram showing an example of the configuration of the pressure detection unit and the vicinity of the pressure detection unit in the second embodiment. FIG. 19 is a diagram showing an example of a specific configuration in the vicinity of the pressure detection unit and the pressure detection unit in the second embodiment. FIG. 20 is a schematic diagram showing a configuration example in which the two systems are selectively operated. FIG. 21 is a diagram schematically showing the relationship between the use timing of the two systems, the coordinate calculation based on the touch detection results of the two systems, and the pressure calculation based on the touch detection results of the two systems. FIG. 22 is a schematic diagram showing an example of the difference between the output of the other system and the output of the one system when there is no pressure. FIG. 23 is a schematic diagram showing an example of the difference between the output of the other system and the output of the one system when there is pressure. FIG. 24 is a schematic diagram showing an example of the difference between the output of the other system and the output of one system when there is pressure. FIG. 25 is a schematic diagram showing a configuration example in which two systems are operated in parallel. FIG. 26 is a schematic diagram showing an example of the outputs of the two systems when there is no pressure in the modified example 1. FIG. 27 is a schematic diagram showing an example of the difference between the outputs of the two systems when there is pressure in the modified example 1. FIG. 28 is a schematic wiring diagram showing an arrangement example of the pressure detection unit in the third embodiment. FIG. 29 is a diagram showing an example of the configuration of the pressure detection unit and the vicinity of the pressure detection unit in the third embodiment. FIG. 30 is a diagram showing an example of a specific configuration in the vicinity of the pressure detection unit and the pressure detection unit in the third embodiment. FIG. 31 is a schematic wiring diagram showing the relationship between the pressure detection unit and the touch detection electrode in the fourth embodiment. FIG. 32 is a diagram showing an example of the configuration of the pressure detection unit and the vicinity of the pressure detection unit in the fourth embodiment. FIG. 33 is a diagram showing an example of a specific configuration in the vicinity of the pressure detection unit and the pressure detection unit in the fourth embodiment. FIG. 34 is a schematic diagram showing a configuration example in which the two systems according to the fourth embodiment are selectively operated. FIG. 35 is a schematic diagram showing a configuration example in which the two systems in the fourth embodiment are selectively operated. FIG. 36 is a diagram showing an example of a specific configuration of the pressure detecting unit and the vicinity of the pressure detecting unit in the modified example 2. FIG. 37 is a diagram showing an example of a module in which the display device with a touch detection function according to the fifth embodiment is mounted. FIG. 38 is an explanatory diagram showing a state in which the fingers are not in contact with or close to each other for explaining the basic principle of the self-capacitating touch detection. FIG. 39 is an explanatory diagram showing a state in which fingers are in contact with each other or in close proximity to explain the basic principle of self-capacitating touch detection. FIG. 40 is a diagram showing an example of waveforms of a drive signal and a touch detection signal. FIG. 41 is a diagram showing an arrangement example of touch detection electrodes. FIG. 42 is a diagram showing an example of a specific configuration in the vicinity of the pressure detection unit and the pressure detection unit in the fifth embodiment. FIG. 43 is a diagram showing an example of a specific configuration in the vicinity of the pressure detection unit and the pressure detection unit in the fifth embodiment. FIG. 44 is a schematic wiring diagram showing an arrangement example of the pressure detection unit in the sixth embodiment. FIG. 45 is a diagram showing an example of a specific configuration in the vicinity of the pressure detection unit and the pressure detection unit. FIG. 46 is a diagram showing an example of a specific configuration in the vicinity of the pressure detection unit and the pressure detection unit. FIG. 47 is a diagram showing an example of a specific configuration in the vicinity of the pressure detection unit and the pressure detection unit. FIG. 48 is a diagram showing an example of a specific configuration in the vicinity of the pressure detection unit and the pressure detection unit. FIG. 49 is a timing chart schematically showing an example of the relationship between the touch detection timing and the pressure detection timing in the sixth embodiment. FIG. 50 is a schematic waveform diagram showing an example of the relationship between the synthesized signal forming a capacitance between the touch detection electrode, the drive signal for touch detection, and the drive signal for pressure detection. Is. FIG. 51 is a schematic wiring diagram showing an arrangement example of the pressure detection unit in the modified example 3. FIG. 52 is a diagram showing an example of a specific configuration in the vicinity of the pressure detection unit and the pressure detection unit. FIG. 53 is a diagram showing an example of a specific configuration in the vicinity of the pressure detection unit and the pressure detection unit. FIG. 54 is a diagram showing an example of a specific configuration in the vicinity of the pressure detection unit and the pressure detection unit. FIG. 55 is a diagram showing an example of a specific configuration in the vicinity of the pressure detection unit and the pressure detection unit. FIG. 56 is a timing chart schematically showing an example of the relationship between the drive timing of the drive electrode and the touch detection timing by the touch detection electrode in the modified example 4. FIG. 57 is a diagram showing an example of the cross-sectional structure of the organic EL display.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. It should be noted that the disclosure is merely an example, and those skilled in the art can easily conceive of appropriate changes while maintaining the gist of the invention are naturally included in the scope of the present invention. Further, in order to clarify the explanation, the drawings may schematically represent the width, thickness, shape, etc. of each part as compared with the actual embodiment, but this is just an example, and the interpretation of the present invention is used. It is not limited. Further, in the present specification and each figure, the same elements as those described above with respect to the above-mentioned figures may be designated by the same reference numerals, and detailed description thereof may be omitted as appropriate.

(Embodiment 1)
FIG. 1 is a block diagram showing a configuration example of a display device with a touch detection function according to the first embodiment of the present invention. The display device 1 with a touch detection function includes a display device 10 with a touch detection function, a control unit 11, a gate driver 12, a source driver 13, a drive electrode driver 14, a constant voltage circuit 15, and a touch detection unit 40. It has. The display device 1 with a touch detection function is a display device in which the display device 10 with a touch detection function has a built-in touch detection function. The display device 10 with a touch detection function is a device in which a liquid crystal display device 20 which is a so-called liquid crystal display using a liquid crystal display element as a display element and a capacitance type touch detection device 30 are integrated. The display device 10 with a touch detection function may be a device in which a capacitance type touch detection device 30 is mounted on a liquid crystal display device 20 that uses a liquid crystal display element as a display element. The liquid crystal display device 20 may be, for example, an organic EL display device.

The liquid crystal display device 20 is a device that sequentially scans and displays according to the scanning signal Vscan supplied from the gate driver 12. The control unit 11 supplies control signals to the gate driver 12, the source driver 13, the drive electrode driver 14, and the touch detection unit 40, respectively, based on the video signal Vdisp supplied from the outside, and these are synchronized with each other. It is a circuit that controls to operate.

The gate driver 12 has a function of supplying a scanning signal Vscan to a scanning line GCL to which a sub-pixel SPix, which is a target of display driving of the display device 10 with a touch detection function, is connected, based on a control signal supplied from the control unit 11. have.

The source driver 13 is a circuit that supplies a pixel signal Vpix to each sub-pixel SPix described later in the display device 10 with a touch detection function based on the control signal supplied from the control unit 11.

The drive electrode driver 14 is a circuit that supplies a drive signal Vcom to the drive electrode COML, which will be described later, of the display device 10 with a touch detection function based on the control signal supplied from the control unit 11.

The constant voltage circuit 15 is a circuit that supplies a constant voltage Vt to the pressure detection units 71 and 72 of the display device 10 with a touch detection function based on the control signal supplied from the control unit 11.

The touch detection unit 40 touches the touch detection device 30 based on the control signal supplied from the control unit 11 and the touch detection signal Vdet supplied from the touch detection device 30 of the display device 10 with the touch detection function (described later). It is a circuit that detects the presence or absence of contact or proximity) and, when there is a touch, obtains its coordinates in the touch detection area. The touch detection unit 40 includes an amplification unit 42, an A / D conversion unit 43, a signal processing unit 44, a coordinate calculation unit 45, a detection timing control unit 46, a current measurement unit 101, a pressure calculation unit 102, and the like.

The amplification unit 42 amplifies the touch detection signal Vdet supplied from the touch detection device 30. The amplification unit 42 may include a low frequency pass analog filter that removes high frequency components (noise components) included in the touch detection signal Vdet, extracts the touch components, and outputs the respective touch components.

The touch detection device 30 operates based on the basic principle of capacitive touch detection, and outputs a touch detection signal Vdet. The basic principle of touch detection in the display device 1 with a touch detection function according to the first embodiment will be described with reference to FIGS. 1 to 4. FIG. 2 is an explanatory diagram showing a state in which the fingers are not in contact with or close to each other in order to explain the basic principle of the capacitive touch detection method. FIG. 3 is an explanatory diagram showing an example of an equivalent circuit in a state where the fingers shown in FIG. 2 are not in contact with or close to each other. FIG. 4 is a diagram showing an example of waveforms of a drive signal and a touch detection signal.

For example, as shown in FIG. 2, the capacitance element C includes a pair of electrodes, a drive electrode E1 and a touch detection electrode E2 that are arranged to face each other with the dielectric D in between, and stores electric charges by capacitance. Form an electric field. As shown in FIG. 3, one end of the capacitive element C is coupled to the AC signal source (drive signal source) S, and the other end is coupled to the voltage detector (touch detection unit) DET. The voltage detector DET is, for example, an integrating circuit included in the amplification unit 42 shown in FIG.

When an AC rectangular wave Sg having a predetermined frequency (for example, about several kHz to several hundred kHz) is applied from the AC signal source S to the drive electrode E1 (one end of the capacitance element C), the touch detection electrode E2 (the other end of the capacitance element C). The output waveform (touch detection signal Vdet) appears via the voltage detector DET coupled to the side. The AC square wave Sg corresponds to the touch drive signal Vcomt described later.

In a state where the fingers are not in contact (or close to each other) (non-contact state), a current I corresponding to the capacitance value of the capacitance element C flows as the capacitance element C is charged and discharged. As shown in FIG. 4, the voltage detector DET converts the fluctuation of the current I according to the AC square wave Sg into the fluctuation of the voltage (solid line waveform V ₀ ).

On the other hand, in the state where the fingers are in contact (or close to each other) (contact state), the capacitance formed by the fingers is in contact with or in the vicinity of the touch detection electrode E2, so that the drive electrode E1 and the touch detection electrode E2 The capacitance of the fringes in between is blocked, and the capacitance element C acts as a capacitance element having a capacitance value smaller than the capacitance value in the non-contact state. Then, a current I that fluctuates according to a change in the capacitance element C flows. As shown in FIG. 4, the voltage detector DET converts the fluctuation of the current I according to the AC square wave Sg into the fluctuation of the voltage (dotted line waveform V ₁ ). In this case, _{the amplitude of the waveform V 1} is smaller than that of the waveform V _{0 described above.} As a result, _{the absolute value | ΔV | of the voltage difference between the waveform V 0} and the waveform V ₁ changes according to the influence of an object close to the outside such as a finger. The voltage detector DET _{accurately detects the absolute value | ΔV | of the voltage difference between the waveform V 0} and the waveform V _1. Therefore, by switching in the circuit, the capacitor's frequency is adjusted to the frequency of the AC square wave Sg. It is more preferable that the operation is provided with a period for resetting the charge / discharge.

The touch detection device 30 shown in FIG. 1 sequentially scans one detection block at a time according to a drive signal Vcom (touch drive signal Vcomt described later) supplied from the drive electrode driver 14 to perform touch detection.

The touch detection device 30 outputs a touch detection signal Vdet for each detection block from a plurality of touch detection electrodes TDL, which will be described later, via the voltage detector DET shown in FIG. 3 or FIG. It is designed to be supplied to the D conversion unit 43.

The A / D conversion unit 43 is a circuit that samples analog signals output from the amplification unit 42 and converts them into digital signals at a timing synchronized with the drive signal Vcom. The amplification unit 42 may be omitted as long as a signal having sufficient intensity and S / N ratio for processing by the signal processing unit 44 can be obtained.

The signal processing unit 44 includes a digital filter that reduces frequency components (noise components) other than the frequency at which the drive signal Vcom is sampled, which is included in the output signal of the A / D conversion unit 43. The signal processing unit 44 is a logic circuit that detects the presence or absence of touch on the touch detection device 30 based on the output signal of the A / D conversion unit 43. The signal processing unit 44 performs a process of extracting only the voltage difference due to the finger. The voltage of the difference due to the finger is the absolute value | ΔV | of the difference _{between the waveform V 0} and the waveform V _{1 described above.} The signal processing unit 44 may perform an operation of averaging the absolute value | ΔV | per detection block, and obtain the average value of the absolute value | ΔV |. As a result, the signal processing unit 44 can reduce the influence of noise. In this way, if the differential voltage cannot be extracted, it means that there is no proximity or contact with the external proximity object, and if the difference voltage can be extracted, it means that there is proximity or contact with the external proximity object. Further, the larger the voltage difference is, the greater the degree of proximity of the externally close objects is, or the more they are in contact with each other. In this way, the touch detection unit 40 can perform touch detection.

Further, the signal processing unit 44 of the first embodiment is based on the output from the touch detection electrode TDL that functions as the touch detection electrode E2 (for example, the current Vi output in response to the application of the voltage from the constant voltage circuit 15). , The pressure detected by the pressure detection unit (for example, pressure detection units 71 and 72) integrated with each touch detection electrode TDL is calculated. The pressure referred to here is not limited to the force per unit area, but also includes a simple pressing force.

The coordinate calculation unit 45 is a logic circuit that obtains the touch panel coordinates when a touch is detected by the signal processing unit 44. Specifically, the signal processing unit 44 is driven, for example, at the timing at which the touch detection electrode TDL from which the touch detection signal Vdet determined to be in contact with an external proximity object is output and the touch detection signal Vdet are obtained. The coordinates of the position corresponding to the combination of the drive electrodes COML are defined as the touch panel coordinates at which the touch is detected. The coordinate calculation unit 45 outputs the touch panel coordinates as the signal output Vout1.

The detection timing control unit 46 is a logic circuit that controls the A / D conversion unit 43, the signal processing unit 44, and the coordinate calculation unit 45 so as to operate in synchronization with each other.

The current measuring unit 101 is a circuit that measures the current value of the current Vi, which will be described later, and outputs an output indicating the measurement result to the pressure calculation unit 102. The pressure calculation unit 102 is a pressure detection unit (for example, the pressure detection unit 71, which is provided integrally with the current value of the current Vi measured by the current measurement unit 101 and each of the touch detection electrodes TDL held in advance. It is a logic circuit that calculates the distribution of the pressure applied to the display device 1 with the touch detection function in accordance with the touch operation based on the information indicating the positional relationship of 72). By using the result of the calculation, for example, the touch panel coordinates to which the strongest pressure is applied due to the touch operation can be specified. The pressure calculation unit 102 outputs the result of the calculation as the signal output Vout2.

FIG. 5 is a diagram showing an example of a module in which a display device with a touch detection function is mounted. As shown in FIG. 5, when mounting the display device 1 with a touch detection function on a module, the drive electrode driver 14 described above may be formed on the glass substrate 21 of the glass substrate.

As shown in FIG. 5, the display device 1 with a touch detection function includes a display device 10 with a touch detection function, a drive electrode driver 14, a COG (Chip On Glass) 19, a printed circuit board T, and the like. FIG. 5 schematically shows the positional relationship between the drive electrode COML and the touch detection electrode TDL formed so as to cross over the drive electrode COML in a plan view. The drive electrode COML is formed, for example, in a direction along one side of the display device 10 with a touch detection function, and the touch detection electrode TDL is, for example, the other side intersecting the one side of the display device 10 with a touch detection function. It is formed in the direction along. The output of the touch detection electrode TDL is provided on the other side of the display device 10 with a touch detection function, and is connected to the touch detection unit 40 mounted on the outside of this module via a terminal portion composed of a printed circuit board T or the like. It is combined. The drive electrode driver 14 is formed on a glass substrate 21 which is a glass substrate. The COG 19 is a chip mounted on a glass substrate 21, and incorporates circuits necessary for display operation, such as a control unit 11, a gate driver 12, and a source driver 13 shown in FIG. The printed circuit board T has a configuration in which wiring is formed, for example, a flexible printed circuit board, and functions as wiring for connecting the touch detection unit 40 (not shown in FIG. 5) and the touch detection electrode TDL, for example. The printed circuit board T also functions as wiring for outputting the signal output Vout1 and the signal output Vout2 to the outside.

Next, a configuration example of the display device 10 with a touch detection function will be described in detail. FIG. 6 is a cross-sectional view showing a schematic cross-sectional structure of the display device with a touch detection function according to the first embodiment. FIG. 7 is a circuit diagram showing a pixel arrangement of the display device with a touch detection function according to the first embodiment. The display device 10 with a touch detection function includes a first substrate 2, a second substrate 3 arranged so as to face the surface of the first substrate 2 in a direction perpendicular to the surface, and the first substrate 2 and the second substrate 3. It includes a liquid crystal layer 6 inserted between them.

The first substrate 2 includes a glass substrate 21, a plurality of pixel electrodes 22 arranged in a matrix on the glass substrate 21, and a plurality of drive electrodes COML formed between the glass substrate 21 and the pixel electrodes 22. Includes an insulating layer 24 that insulates the pixel electrode 22 and the drive electrode COML. The glass substrate 21 includes a thin film transistor (TFT) element Tr of each sub-pixel SPIx shown in FIG. 7, a signal line SGL that supplies a pixel signal Vpix to each pixel electrode 22 shown in FIG. 6, and each TFT element Tr. Wiring such as a scanning line GCL to be driven is formed. In this way, the signal line SGL extends on a plane parallel to the surface of the glass substrate 21 and supplies a pixel signal Vpix for displaying an image on the pixels. The liquid crystal display device 20 shown in FIG. 7 has a plurality of sub-pixel SPix arranged in a matrix. The sub-pixel SPix includes a TFT element Tr and a display element (for example, a liquid crystal element LC). The TFT element Tr is composed of a thin film transistor, and in this example, it is composed of an n-channel MOS (Metal Oxide Semiconductor) type TFT. One of the source or drain of the TFT element Tr is coupled to the signal line SGL, the gate is coupled to the scanning line GCL, and the other of the source or drain is coupled to one end of the liquid crystal element LC. One end of the liquid crystal element LC is coupled to the other of the source or drain of the TFT element Tr, and the other end is coupled to the drive electrode COML. For example, the liquid crystal element LC includes a pixel electrode 22, and the pixel electrode 22 is connected to the drain of the TFT element Tr. Further, the plurality of liquid crystal elements LC are connected to the plurality of drive electrodes COML via the insulating layer 24 and the liquid crystal layer 6. Then, the sub-pixel SPIx is driven according to the electric charges given to the pixel electrode 22 and the drive electrode COML. As described above, the pixel electrode 22 and the drive electrode COML function as electrodes used for driving the sub-pixel SPix. In this embodiment, the drive electrode COML, the insulating layer 24, and the pixel electrode 22 are laminated in this order on the glass substrate 21, but the present invention is not limited to this, and the pixel electrode 22 and the insulation are not limited to this. The layer 24 and the drive electrode COML may be laminated in this order, or the pixel electrode 22 and the drive electrode COML may be formed in the same layer via the insulating layer 24.

The sub-pixel SPix shown in FIG. 7 is coupled to each other by the scanning line GCL with another sub-pixel SPix belonging to the same row of the liquid crystal display device 20. The scanning line GCL is combined with the gate driver 12, and the scanning signal Vscan is supplied from the gate driver 12. Further, the sub-pixel SPix is coupled to each other by the signal line SGL with other sub-pixel SPix belonging to the same row of the liquid crystal display device 20. The signal line SGL is combined with the source driver 13, and the pixel signal Vpix is supplied from the source driver 13. Further, the sub-pixel SPix is coupled to each other by the drive electrode COML with other sub-pixel SPix belonging to the same row of the liquid crystal display device 20. The drive electrode COML is coupled with the drive electrode driver 14, and a drive signal Vcom is supplied from the drive electrode driver 14.

The gate driver 12 shown in FIG. 1 is formed in a matrix on the liquid crystal display device 20 by applying the scanning signal Vscan to the gate of the TFT element Tr of the pixel Pix via the scanning line GCL shown in FIG. The sub-pixel SPix sharing the continuous scanning line GCL in one line (one horizontal line) of the sub-pixel SPix is sequentially selected as the display drive target. The source driver 13 shown in FIG. 1 supplies the pixel signal Vpix to each sub-pixel SPix sequentially selected by the gate driver 12 via the signal line SGL shown in FIG. Then, in these sub-pixel SPix, display output corresponding to the supplied pixel signal Vpix is performed. The drive electrode driver 14 shown in FIG. 1 applies a drive signal Vcom to drive the drive electrode COML for each block composed of a predetermined number of drive electrode COMLs. The specific extension directions of the drive electrode COML and the touch detection electrode TDL can be changed as appropriate. In FIG. 7, the drive electrode COML is extended along the same direction as the arrangement direction of the sub-pixel SPix constituting the pixel Pix, but the extension direction of the drive electrode COML is a direction orthogonal to the arrangement direction. May be good. Further, the touch detection electrode TDL may be arranged so as to overlap with the drive electrode COML in a twisted relationship, and the angle between the drive electrode COML and the touch detection electrode TDL does not have to be a right angle in a plan view.

The liquid crystal display device 20 drives the gate driver 12 to scan the scanning line GCL in a time-division manner in a line-sequential manner. Further, the drive electrode driver 14 applies the drive signal Vcom to the block including the drive electrode COML corresponding to the position where the sub-pixel SPix to which the pixel signal Vpix is supplied by the source driver 13 is provided. ..

The drive electrode COML according to the first embodiment functions as a drive electrode of the liquid crystal display device 20 and also as a drive electrode of the touch detection device 30. FIG. 8 is a perspective view showing a configuration example of a drive electrode and a touch detection electrode of the display device with a touch detection function according to the first embodiment. As shown in FIG. 6, the drive electrode COML shown in FIG. 8 faces the pixel electrode 22 in the direction perpendicular to the surface of the glass substrate 21. The touch detection device 30 includes a drive electrode COML provided on the first substrate 2 and a touch detection electrode TDL provided on the second substrate 3. The touch detection electrode TDL is configured to include a striped electrode pattern extending in a direction intersecting the extending direction of the electrode pattern of the driving electrode COML. The touch detection electrode TDL faces the drive electrode COML in a direction perpendicular to the surface of the glass substrate 21. Each electrode pattern of the touch detection electrode TDL is coupled to the input of the amplification unit 42 of the touch detection unit 40. The electrode patterns that intersect each other by the drive electrode COML and the touch detection electrode TDL generate capacitance at the intersection. As described above, the display device 1 with the touch detection function is provided at a non-contact position between the touch detection electrode (touch detection electrode TDL) and the drive electrode (drive electrode COML) that forms a capacitance between the touch detection electrode. ) Is provided. The touch detection electrode TDL or the drive electrode COML (drive electrode block) is not limited to a shape that is divided into a plurality of stripes. For example, the touch detection electrode TDL or the drive electrode COML (drive electrode block) may have a comb tooth shape. Alternatively, the touch detection electrode TDL or the drive electrode COML (drive electrode block) may be divided into a plurality of parts, and the shape of the slit for dividing the drive electrode COML may be a straight line or a curved line.

With this configuration, in the touch detection device 30, when the touch detection operation is performed, the drive electrode driver 14 drives the drive electrode block so as to scan the drive electrode block in a time-division manner in a line-sequential manner. As a result, one detection block of the drive electrode COML is sequentially selected in the scan direction Scan. Then, the touch detection signal Vdet is output from the touch detection electrode TDL. In this way, the touch detection device 30 is adapted to perform touch detection of one detection block. That is, the drive electrode block corresponds to the drive electrode E1 in the above-mentioned basic principle of touch detection, the touch detection electrode TDL corresponds to the touch detection electrode E2, and the touch detection device 30 touches according to this basic principle. It is designed to detect. In this way, the touch detection device 30 performs touch detection on the screen side (display surface side) of the display device (liquid crystal display device 20). As shown in FIG. 8, the electrode patterns intersecting each other form a capacitive touch sensor in a matrix. Therefore, by scanning the entire touch detection surface of the touch detection device 30 provided so as to cover the display surface on which the display output is performed by the display area, the display device 1 with the touch detection function touches or approaches an external proximity object. It is configured so that the position where the above occurs can be detected.

The liquid crystal layer 6 modulates the light passing therethrough according to the state of the electric field. For example, a liquid crystal in a transverse electric field mode such as a so-called IPS (In Plane Switching) method including an FFS (Fringe Field Switching) method is used. The liquid crystal display device used is used. An alignment film may be arranged between the liquid crystal layer 6 and the first substrate 2 shown in FIG. 6 and between the liquid crystal layer 6 and the second substrate 3, respectively.

The second substrate 3 includes a glass substrate 31 and a color filter 32 formed on one surface of the glass substrate 31. A touch detection electrode TDL, which is a detection electrode of the touch detection device 30, is formed on the other surface of the glass substrate 31, and a polarizing plate 35 is arranged on the touch detection electrode TDL. In the first embodiment, in the first substrate and the second substrate, the substrate is a glass substrate, but the present invention is not limited to this, and a film substrate or the like may be used.

In the color filter 32 shown in FIG. 6, for example, the color regions of the color filters colored in three colors of red (R), green (G), and blue (B) are periodically arranged and shown in FIG. 7 described above. Each sub-pixel SPix is associated with color regions 32R, 32G, 32B (see FIG. 7) of three colors R, G, and B, and the color regions 32R, 32G, and 32B form a set of pixel Pix. Pixels are arranged in a matrix along a direction parallel to the scanning line GCL and a direction parallel to the signal line SGL to form a display area. In the following description and the schematic diagram of FIG. 9 and the like, reference numeral 20a is attached to the display area by the display area for the purpose of showing the positional relationship between the display area and other configurations.

The color filter 32 faces the liquid crystal layer 6 in the direction perpendicular to the glass substrate 21. In this way, the sub-pixel SPix can perform a single color display. The liquid crystal display device 20 displays an image by a display output using a pixel Pix in which a sub-pixel SPix color-coded by a color filter 32 is combined. That is, the liquid crystal display device 20 is a display device having a plurality of pixel Pix for displaying an image. The color filter 32 may be a combination of other colors as long as it is colored in a different color. Further, the type of color is not limited to three colors, and may be four or more colors. Further, the color filter 32 may include a non-colored region or a non-existent region. In other words, there may be sub-pixel SPix that are not colored by the color filter 32.

Next, the configuration related to pressure detection and the mechanism of pressure detection will be described. FIG. 9 is a schematic wiring diagram showing an arrangement example of pressure detection units 71 and 72 provided in the display device 1 with a touch detection function. The display device 1 with a touch detection function includes pressure detection units 71 and 72. Specifically, as shown in FIG. 9, for example, the pressure detection units 71 and 72 are provided on the opposite side of the end portion of the touch detection electrode TDL with the display area interposed therebetween. More specifically, the pressure detection units 71 and 72 include the touch detection electrode TDL and the wiring as a configuration continuous with the wiring connecting the touch detection unit 40 (see FIG. 5) and the touch detection electrode TDL outside the display area. It is formed integrally. In FIG. 9 and the like, reference numeral U is attached to the electrical connection end on the side where the touch detection electrode TDL is interposed when viewed from the pressure detection units 71 and 72. Further, in FIG. 9 and the like, reference numeral Q is attached to the connection line on the side where the touch detection electrode TDL does not intervene when viewed from the pressure detection units 71 and 72. Further, in FIG. 9 and the like, subscript numbers are added to the reference numerals U and Q. The pressure detection unit (pressure detection unit 71 or pressure detection unit 72) and the touch detection electrode TDL to which the connection end U and the connection line Q having the same subscript numbers are connected are the same. Further, in FIG. 9 and the like, the reference numeral T is assigned to a part of the configuration in which the pressure detection unit (pressure detection unit 71 or the pressure detection unit 72) and the touch detection electrode TDL interposed between the connection end U and the connection line Q are integrated. It is attached and has the same subscript number as the connection end U and the connection line Q. In FIG. 9, a plurality of connection ends U ₁ , U ₂ , ..., U ₁₄ , a plurality of connection lines Q ₁ , Q ₂ , ..., Q ₁₄ and configurations T ₁ , T ₂ are shown, but these are pressures. It does not indicate the specific number of the detection unit (pressure detection unit 71 or pressure detection unit 72) and the touch detection electrode TDL. For example, although not shown, the pressure detection unit 72 and the touch detection electrode TDL interposed between _{the connection end U 3} and the connection line Q ₃ can be regarded as _{the configuration T 3.} The same applies to the configuration (T) interposed between the connection end U and the connection line Q whose subscript is a value after 4. When a plurality of connection ends U ₁ , U ₂ , ... Are not particularly distinguished, they may be described as connection ends U. Further, when a plurality of connecting lines Q ₁ , Q ₂ , ... Are not particularly distinguished, they may be described as connecting lines Q. Further, when a plurality of configurations T ₁ , T ₂ , ... Are not particularly distinguished, they may be described as configuration T.

FIG. 10 is a diagram showing an example of a specific configuration in the vicinity of the pressure detection unit 71 and the pressure detection unit 71. FIG. 11 is a diagram showing an example of a specific configuration in the vicinity of the pressure detection unit 72 and the pressure detection unit 72. The pressure detection units 71 and 72 are on the plate surface of the display device 1 having a touch detection function and orthogonal to the detection direction with the strain detection pattern which is a plurality of wiring patterns extending in parallel along the detection direction. It has a folded pattern that connects the strain detection patterns that are adjacent to each other in the crossing direction along the line. The positions of the two folded patterns connecting the one strain detection pattern, the two adjacent strain detection patterns, and the one strain detection pattern are staggered with one strain detection pattern in between. That is, the one strain detection pattern is connected to one of the two strain detection patterns by one folding pattern located on one end side in the detection direction, and another one located on the other end side in the detection direction. It is connected to the other of the two strain detection patterns by one folding pattern. The pressure detection units 71 and 72 are formed as a continuous wiring pattern so that a plurality of strain detection patterns along the detection direction are lined up along the intersection direction by the plurality of strain detection patterns and folding patterns having such a connection relationship. ..

The pressure detection units 71 and 72 function as strain gauges for detecting the strain generated in the display device 1 with a touch detection function. Specifically, the pressure detection units 71 and 72 detect the strain when the plate surface of the display device 1 with the touch detection function is distorted due to the pressing force accompanying the touch operation. The degree of such strain depends on the pressing force associated with the touch operation. In this way, the pressure detection units 71 and 72 function as a configuration for detecting the strain applied to the display device 1 with the touch detection function by detecting the strain of the display device 1 with the touch detection function. To do. More specifically, since the electric resistance values of the pressure detection units 71 and 72 change according to the degree of strain, the display device 1 with the touch detection function changes the electric resistance values of the pressure detection units 71 and 72. Based on this, the display device 1 with a touch detection function has a mechanism capable of detecting the pressure causing the strain (pressing pressure associated with the touch operation). Hereinafter, when simply described as "pressure detection", the presence or absence of pressure (pressing pressure associated with touch operation) causing distortion in the display device 1 with a touch detection function using the pressure detection units 71 and 72, and the pressure. Refers to the detection of strength. As described above, the display device 1 with the touch detection function has a strain gauge (for example, the pressure detection unit 71,) provided integrally with the touch detection electrode (for example, the touch detection electrode TDL) provided along the touch detection surface. 72) is provided.

The pressure detection units 71 and 72 mainly detect the strain generated along the detection direction. In the first embodiment, the detection direction of the pressure detection unit 71 and the detection direction of the pressure detection unit 72 are different. For example, the detection direction of the pressure detection unit 71 is the same as the extension direction of the drive electrode COML. On the other hand, the detection direction of the pressure detection unit 72 is orthogonal to the extension direction of the drive electrode COML and is a direction along the plate surface of the display device 1 with the touch detection function. By arranging a plurality of pressure detection units 71 and 72, it becomes possible to grasp the pressure distribution of the touch detection surface (for example, which part is applying stronger pressure) based on the amount of each strain.

The folded patterns of the pressure detecting units 71 and 72 are provided so as to have higher rigidity than the strain detecting pattern with respect to the strain in the crossing direction. Specifically, the folding pattern has a rectangular shape, and occurs when strain occurs in the crossing direction as compared with the change in the electrical resistance value of the strain detection pattern that occurs when strain occurs in the detection direction. It is provided so that the degree of change in the electric resistance value of the folded pattern becomes smaller.

The pressure detection unit 71 and the pressure detection unit 72 are arranged alternately. Specifically, as shown in FIG. 9, for example, in the frame region located outside the display region in the frame region whose longitudinal direction is along the extension direction of the drive electrode COML, the pressure detection unit 71 and the pressure detection unit 72 Are alternately arranged along the extending direction of the drive electrode COML. When looking at the relationship between the touch detection electrodes TDL arranged along the extension direction of the drive electrode COML and the pressure detection units 71 and 72, is the pressure detection unit 71 continuous with the touch detection electrode TDL? Whether or not the pressure detection unit 72 is used is switched in units of a predetermined number (for example, two in FIG. 9).

Regarding pressure detection, for example, there is a method of measuring an electric resistance value based on a current (for example, current Vi) flowing by supplying a voltage to the pressure detection units 71 and 72. The pressure calculation unit 102 calculates the pressure based on the measurement of the electric resistance value. That is, the touch detection unit 40 detects the pressure based on the electric resistance of the touch detection electrode (for example, the touch detection electrode TDL) integrally provided with the strain gauge (for example, the pressure detection units 71 and 72). Functions as a department.

FIG. 12 is a block diagram showing an example of a functional configuration of a circuit related to pressure detection. As shown in FIG. 12, the plurality of connection ends U ₁ , U ₂ , ... Are connected to the constant voltage circuit 15 via the selector switch unit SEL. The selector switch unit SEL is a switching circuit that selectively connects a plurality of connection ends U ₁ , U ₂ , ... To the constant voltage circuit 15. The selector switch unit SEL may be provided as a part of the configuration of the constant voltage circuit 15, or may be an independent circuit that operates under the control of the control unit 11.

The constant voltage circuit 15 supplies a constant voltage Vt to one configuration T (for example, any of the configurations T ₁ , T _{2, ...) Connected via the selector switch unit SEL.} Here, the constant voltage circuit 15 is provided with a touch detection electrode TDL on the connection end U side to which the selector switch unit SEL is connected, that is, the pressure detection unit (pressure detection unit 71 or pressure detection unit 72). Apply voltage from the side of the switch. Although FIGS. 9 and 12 and the like are shown as applying a voltage from one end (connection end U) side to one configuration T, both ends of one configuration T (for example, the connection end U and the connection line) are shown. A voltage may be applied from Q). The one configuration T generates a current Vi corresponding to a constant voltage Vt and outputs it to the current measuring unit 101. The current measuring unit 101 measures the voltage value of the current Vi, and outputs an output indicating the measurement result to the pressure calculation unit 102. Since the configuration T has a pressure detection unit (pressure detection unit 71 or pressure detection unit 72), the electric resistance value is changed according to the strain generated by the pressure on the touch detection surface. That is, the magnitude of the voltage value of the current Vi depends on the presence or absence of pressure and the magnitude of the pressure when there is pressure. The pressure calculation unit 102 was detected at the position of the pressure detection unit (pressure detection unit 71 or pressure detection unit 72) of the one configuration T based on the current value of the current Vi measured by the current measurement unit 101. Calculate the pressure.

The configuration T to which the constant voltage Vt is supplied sequentially transitions when the selector switch unit SEL performs a switching operation in predetermined time units. For example, the selector switch unit SEL may scan the configuration T in the subscript order, or may scan the configuration T in a different order. Each of the plurality of configurations T generates a current Vi corresponding to the constant voltage Vt and outputs the current Vi to the current measuring unit 101. The current measuring unit 101 measures the voltage value of the current Vi output from each of the plurality of configurations T, and outputs an output indicating the measurement result to the pressure calculation unit 102. The pressure calculation unit 102 is a pressure detection unit (for example,) provided integrally with the pressure indicated by the voltage value of the current Vi output from each of the plurality of configurations T and each of the touch detection electrodes TDL held in advance. Based on the information indicating the positional relationship of the pressure detection units 71 and 72), the distribution of the pressure applied to the display device 1 with the touch detection function due to the touch operation is calculated. When such an operation is adopted, the timing of touch detection by the touch detection electrode TDL that performs touch detection by the capacitance method and the timing of voltage supply for pressure detection to the pressure detection units 71 and 72 are different timings. Is set.

Further, in the first embodiment, the drive electrode COML is used for both display drive and touch detection. Therefore, the display drive timing and the touch detection timing are set to be different from each other. The timing control is performed via the detection timing control unit 46 under the control of the control unit 11, for example, but a dedicated configuration for controlling the timing may be provided.

FIG. 13 is a timing chart schematically showing the relationship between the display drive timing, the touch detection timing, and the pressure detection timing in the display device 1 with the touch detection function. As described above, the display drive timing and the touch detection timing are different. Therefore, in the first embodiment, an intermittent drive system in which display drive and touch detection are alternately performed is adopted. Further, as described above, the timing of touch detection and the timing of pressure detection are different. On the other hand, it is not necessary to make the display drive timing and the pressure detection timing different. Therefore, in the first embodiment, the display drive and the pressure detection are performed at the same timing. That is, at the display drive timing, the voltage from the constant voltage circuit 15 is supplied to the touch detection electrodes TDL and the pressure detection units 71 and 72. On the other hand, at the timing of touch detection, the touch detection electrode TDL forms a capacitance C used for touch detection according to the drive signal Vcom of the drive electrode COML.

Since the electrical resistance of each of the electrodes of the display device 1 with the touch detection function, that is, the drive electrode COML, the touch detection electrode TDL, the pressure detection units 71, 72, etc., changes depending on the temperature, these electrodes Touch detection and pressure detection can be performed with higher accuracy by considering the relationship between the temperature and the temperature. For example, the display device 1 with a touch detection function may be provided with a temperature detection unit, and the signal processing unit 44 or the like may perform correction according to the temperature detected by the temperature detection unit in the calculation.

The circuit configuration related to pressure detection using the pressure detection units 71 and 72 can be changed as appropriate. FIG. 14 is a block diagram showing another example of the functional configuration of the circuit related to pressure detection. As shown in FIG. 14, the configuration T having the pressure detection unit (pressure detection unit 71 or pressure detection unit 72) is one of the four electrical resistances constituting the Wheatstone bridge H whose electrical resistance value is unknown. The circuit configuration may be treated as. Specifically, the Wheatstone bridge H has electric resistances R ₁ , R ₂ , R ₃ having known electric resistance values, and a plurality of configurations T. The plurality of configurations T are selectively connected to other electrical resistances constituting the Wheatstone bridge H by the selector switch unit SEL. That is, the configuration T connected by the selector switch unit SEL is treated as one of the four electrical resistances constituting the Wheatstone bridge H whose electrical resistance value is unknown. More specifically, a Wheatstone bridge H, for example, configuration T and the electric resistance R _2, R ₃ are connected. Moreover, Wheatstone bridge H, the electric resistance R _2, the electrical resistance R ₁ on the end side configuration T is not connected of R ₃ are connected.

The Wheatstone bridge H is connected to the constant voltage circuit 15 and the electrical resistance measurement circuit 101A. The electric resistance measuring circuit 101A has a configuration provided in place of the current measuring unit 101, and measures the electric resistance value of the Wheatstone bridge H. Specifically, the constant voltage circuit 15 is connected to the Wheatstone bridge H at two points _{, for example, between the configuration T and the electric resistance R 3} and between the electric resistance R ₁ and the electric resistance R _{2 to supply a constant voltage.} To do. Electric resistance measuring circuit 101A, for example, is connected to the Wheatstone bridge H at two points between the between the structure T and the electric resistance R ₂ and the electric resistance R ₁ and the electrical resistance R _3, measuring the electrical resistance value. The electric resistance value measured by the electric resistance measuring circuit 101A is a change in the electric resistance value of the pressure detection unit (pressure detection unit 71 or pressure detection unit 72) of the configuration T caused by the strain generated by the pressure on the touch detection surface. It changes according to. Therefore, the electric resistance value measured by the electric resistance measuring circuit 101A indicates the pressure at which the pressure detecting unit 71 or the pressure detecting unit 72 is distorted. An output indicating the electric resistance value measured by the electric resistance measuring circuit 101A is output to the pressure calculation unit 102. The pressure calculation unit 102 determines the positional relationship between the pressure indicated by the electric resistance value and the pressure detection units (for example, pressure detection units 71 and 72) integrally provided with the respective touch detection electrodes TDL held in advance. Based on the indicated information, the distribution of the pressure applied to the display device 1 with the touch detection function due to the touch operation is calculated.

In FIG. 14, a plurality of configurations T share the Wheatstone bridge H by using the selector switch unit SEL, but each of the configurations T may be provided with the Wheatstone bridge H.

FIG. 15 is a timing chart schematically showing the relationship between the display drive timing, the touch detection timing, and the pressure detection timing when touch detection and pressure detection are performed in parallel during the same period. In the explanation with reference to FIG. 13, the timing of touch detection by the touch detection electrode TDL that performs touch detection by the capacitance method and the timing of current supply for pressure detection to the pressure detection units 71 and 72 are different timings. However, both timings may be the same. That is, touch detection and pressure detection may be performed in parallel during the same period.

FIG. 16 is a block diagram showing an example of a functional configuration of a circuit related to pressure detection when touch detection and pressure detection are performed in parallel during the same period. In the example shown in FIG. 16, instead of the constant voltage circuit 15, a voltage application circuit 15A that outputs a pulse (short diameter wave) from the connection line Q side to apply a voltage to the configuration T is provided. The output (touch detection signal Vdet) from the configuration T to which the voltage is applied is input to the touch detection unit 40 and the difference detection unit 101B connected via the selector switch unit SEL. The difference detection unit 101B is composed of an amplifier AMP that amplifies the output from the configuration T, a comparator COMP that outputs according to the comparison result between the output from the amplifier and the reference voltage TH (see FIG. 17) that functions as a threshold value, and a comparator COMP. It has a counter CUN or the like that counts the period during which the output of is generated.

FIG. 17 is a diagram showing an example of the relationship between the voltage waveform of the pulse output from the voltage application circuit 15A, the output of the amplifier AMP, and the output of the comparator COMP corresponding to the output of the amplifier AMP. The output of the configuration T generated in response to the pulse output from the voltage application circuit 15A is amplified by the amplifier AMP and compared with the reference voltage TH by the comparator COMP. Here, the output of the configuration T differs depending on whether or not the pressure detection unit (pressure detection unit 71 or pressure detection unit 72) is strained according to the pressure. _{Specifically, the output PE 1} when strain is generated according to the pressure has a larger time constant for the rise and fall of the output than _{the output PN 1} when no strain is generated. This is because when the pressure detection unit (pressure detection unit 71 or pressure detection unit 72) is strained according to the pressure, the electrical resistance of the pressure detection unit increases. _{Therefore, the output PE 1} when strain is generated according to the pressure has a later timing when it exceeds the reference voltage TH than _{the output PN 1} when no strain is generated, and the timing when it falls below the reference voltage TH. Even in relation to the reference voltage TH, such as being faster, a difference is generated with respect to _{the output PN 1 when no distortion is generated. Therefore, the output PE 2} of the comparator when strain is generated according to the pressure is output such that the output start timing is delayed and the output start timing is earlier than _{the output PN 2} when strain is not generated. Make a difference in the pattern of. The difference detection unit 101B outputs the count result by the counter COUN to the pressure calculation unit 102. The pressure calculation unit 102 is the position of the pressure detection unit (for example, pressure detection units 71 and 72) provided integrally with the pressure detection result indicated by the count result and each of the touch detection electrodes TDL held in advance. Based on the information indicating the relationship, the distribution of the pressure applied to the display device 1 with the touch detection function due to the touch operation is calculated. In the configuration shown in FIG. 17, the touch detection unit 40 may make a touch determination using the output of the amplifier AMP or the output of the comparator COMP.

As described above, according to the first embodiment, the strain gauge (for example, pressure detection units 71 and 72) provided integrally with the touch detection electrode (for example, the touch detection electrode TDL) provided along the touch detection surface is provided. Therefore, the configuration related to touch detection and the configuration related to pressure detection can be integrated. Therefore, the pressure can be detected in a configuration integrated with the components used in other configurations (configuration related to touch detection).

Further, since the pressure is detected based on the electric resistance of the touch detection electrode integrally provided with the strain gauge, it is easy to secure the accuracy of the pressure detection.

(Embodiment 2)
Hereinafter, an embodiment (Embodiment 2) of the present invention, which is partially different from the first embodiment, will be described with reference to FIGS. 18 to 23. Regarding the description of the second embodiment, the same components as those of the first embodiment may be designated by the same reference numerals and the description thereof may be omitted.

FIG. 18 is a diagram showing an example of the configuration in the vicinity of the pressure detection unit 71 and the pressure detection unit 71 in the second embodiment. FIG. 19 is a diagram showing an example of a specific configuration in the vicinity of the pressure detection unit 72 and the pressure detection unit 72 in the second embodiment. In the second embodiment, each of the touch detection electrode TDLs schematically shown by one solid line in FIG. 9 has two electric systems. Hereinafter, in relation to the description of the two systems, one of the two systems may be described as "one system RX1" and the other as "the other system RX2". The specific arrangement of the pressure detection units 71 and 72 in the second embodiment is the same as the arrangement shown in FIG. 9, for example. The various pressure detection methods described with reference to FIGS. 12 to 17 described above are similarly applicable to the second embodiment.

As shown in FIGS. 18 and 19, one system RX1 has the same configuration as the touch detection electrode TDL in the first embodiment. That is, the pressure detection units 71 and 72 in the second embodiment are configured to be continuous with the wiring connecting the touch detection unit 40 (see FIG. 5) and the touch detection electrode TDL of the one system RX1 outside the display area. It is integrally formed with the touch detection electrode TDL of RX1 and the wiring. The other system RX2 does not have pressure detection units 71 and 72. Specifically, for example, as shown in FIGS. 18 and 19, pressure detection units 71 and 72 provide wiring for connecting the touch detection electrode TDL of the other system RX2 and the touch detection unit 40 (see FIG. 5). An L-shaped wiring pattern that borders the formed area is formed. As described above, in the second embodiment, the touch detection electrode (one system RX1) integrally provided with the strain gauge and the touch detection electrode (the other system RX2) not provided with the strain gauge are provided side by side. There is.

FIG. 20 is a schematic diagram showing a configuration example in which the two systems are selectively operated. In FIG. 20 and the like, the illustration of the amplification unit 42 is omitted. In the second embodiment, the A / D conversion unit 43 can be shared by one system RX1 and the other system RX2. Specifically, for example, as shown in FIG. 20, a switch SW1 is provided in the connection path between one one system RX1 and one other system RX2 and one ADC 43, and one system RX1 or the other system. It may be possible to switch which of RX2 is connected to the A / D conversion unit 43. The switch SW1 switches the configuration connected to the A / D conversion unit 43 according to, for example, the switching timing managed by the detection timing control unit 46.

In the second embodiment, touch detection and pressure detection can be performed in parallel by using both one system RX1 and the other system RX2. Specifically, in the second embodiment, the output of the other system RX2 which does not have the pressure detection units 71 and 72 is used as a reference, and a change may occur depending on the output of the other system RX2 and the presence or absence of pressure. Pressure detection can be performed based on the relationship with the output of one system RX1.

FIG. 21 is a diagram schematically showing the relationship between the use timing of the two systems, the coordinate calculation based on the touch detection results of the two systems, and the pressure calculation based on the touch detection results of the two systems. As shown in the upper part of FIG. 21, one system RX1 and the other system RX2 are used at different timings. One system RX1 and the other system RX2 of the touch detection electrode TDL form a drive electrode COML and a capacitance C3 at different timings, and output a touch detection signal Vdet.

The touch detection signals Vdet output by one system RX1 and the other system RX2 can both be used for touch detection. Therefore, the touch detection period is not shortened by the exclusive use of one system RX1 and the other system RX2, and either one system RX1 or the other system RX2 can form the drive electrode COML and the capacitance C3. Period (Rx1 + Rx2) functions as a touch detection period.

FIG. 22 is a schematic diagram showing an example of the difference between the output of the other system RX2 and the output of the one system RX1 when there is no pressure. 23 and 24 are schematic views showing an example of the difference between the output of the other system RX2 and the output of the one system RX1 when there is pressure. The pressure detection can be obtained based on the difference (RX2t1-Rx1t1) between the output of the other system RX2 and the output of the one system RX1. As shown in FIGS. 9, 18 and 19, one system RX1 and the other system RX2 of the touch detection electrode TDL are arranged at substantially the same position, and touch detection is performed at substantially the same position. Therefore, when there is no pressure due to the touch operation, the touch detection signal Vdet of one system RX1 and the touch detection signal Vdet of the other system RX2 are substantially the same. Therefore, if the touch detection period is the same, the output pattern (RX2t1) of the touch detection signal Vdet by the other system RX2 from the start timing to the end timing of touch detection and one system from the start timing to the end timing of touch detection. As shown in FIG. 22, the combined output obtained by combining the inverted output pattern (-RX1t1) of the touch detection signal Vdet by RX1 is a combined output that cancels each other's outputs. That is, when the combined output showing the difference (RX2t1-Rx1t1) between the output of the other system RX2 and the output of one system RX1 is substantially zero or small enough to be equal to zero, pressure detection that there is no pressure by touch operation The result of On the other hand, when pressure is applied by touch operation, strain is applied to the pressure detection units 71 and 72. In this case, the electrical resistance of one system RX1 becomes larger than when no pressure is applied. Therefore, the inverted output pattern (-RX1t1) of the touch detection signal Vdet by one system RX1 from the start timing to the end timing of the touch detection changes according to the increase in the electric resistance. Specifically, for example, as shown in FIG. 23, the wave height (resistance value conversion) of the inverted output pattern (-RX1t1) of the touch detection signal Vdet is the output pattern (RX2t1) of the touch detection signal Vdet by the other system RX2. There is a difference in wave height (resistance value conversion), such as being higher than the wave height (resistance value conversion). Further, when the output of the comparator COMP described with reference to FIG. 17 is adopted in the second embodiment, as shown in FIG. 24, the inverted output pattern (-RX1t1) of the touch detection signal Vdet has a rising waveform. There is a difference in the rising period of the waveform, such as a shorter period. Therefore, the combined output showing the difference (RX2t1-Rx1t1) between the output of the other system RX2 and the output of the one system RX1 becomes a combined output with positive and negative signal changes, for example, as shown in FIGS. 23 and 24. .. That is, when the combined output is significantly larger than zero in this way, the result of pressure detection that the pressure by the touch operation is applied can be obtained. Since the combined output increases as the applied pressure increases, the pressure strength can also be measured by the degree of change in the combined output with respect to the combined output when there is no pressure.

In the second embodiment, the signal processing unit 44 calculates the pressure based on the difference between the two touch detection signals Vdet, and the pressure calculation unit 102 calculates the pressure distribution based on the calculated pressure. That is, the touch detection unit 40 in the second embodiment touch detection based on the capacitance of the touch detection electrode (touch detection electrode TDL) integrally provided with the strain gauge (for example, the pressure detection units 71 and 72). It functions as a detection unit that detects pressure based on the difference between the output of (touch detection signal Vdet) and the output of touch detection based on the capacitance of the touch detection electrode without a strain gauge.

As described above, according to the second embodiment, the output of touch detection based on the capacitance of the touch detection electrode (touch detection electrode TDL) integrally provided with the strain gauge (for example, pressure detection units 71 and 72) (for example, the pressure detection electrode TDL). Since the pressure is detected based on the difference between the touch detection signal Vdet) and the touch detection output based on the capacitance of the touch detection electrode without the strain gauge, the pressure can be detected at the same time as the touch detection. .. Therefore, the necessity of supplying the voltage for pressure detection to the strain gauge at a timing different from the touch detection timing and the restriction on the timing are eliminated, and the constant voltage circuit 15 and the like can be omitted.

In the first embodiment as well, it is possible to perform touch detection based on the capacitance as in the second embodiment. However, it is necessary that the touch detection unit 40 holds information as a reference when there is no pressure in advance.

(Modification 1: Modification of Embodiment 2)
Hereinafter, a modified example of the second embodiment (modified example 1) will be described with reference to FIGS. 25 to 27. Regarding the description of the first modification, the same reference numerals may be given to the same configurations as those of the second embodiment, and the description may be omitted.

FIG. 25 is a schematic diagram showing a configuration example in which two systems are operated in parallel. In the second embodiment described with reference to FIG. 20, a two-system switching method using the switch SW1 has been adopted, but as shown in FIG. 25, the A / D conversion unit 43 dedicated to each of the two systems has been adopted. May be configured to connect.

FIG. 26 is a schematic diagram showing an example of the outputs of the two systems when there is no pressure in the modified example 1. FIG. 27 is a schematic diagram showing an example of the difference between the outputs of the two systems when there is pressure in the modified example 1. The touch detection electrode TDL in the first modification is the same as the touch detection electrode TDL in the embodiment. In addition, since a dedicated A / D conversion unit 43 is used in each of the two systems, touch detection can be performed at the same timing by parallel operation. Therefore, as shown in FIG. 26, the output pattern (RX2t1) of the touch detection signal Vdet by the other system RX2 from the start timing to the end timing of touch detection and the one system RX1 from the start timing to the end timing of touch detection. If the output pattern (RX1t1) of the touch detection signal Vdet is substantially the same, it can be seen that there is no pressure due to the touch operation. On the other hand, if pressure is applied by the touch operation, as shown in FIG. 27, the output pattern (RX2t1) of the touch detection signal Vdet by the other system RX2 from the start timing to the end timing of the touch detection and the start timing of the touch detection. The difference from the output pattern (RX1t1) of the touch detection signal Vdet by the other system RX2 from to the end timing is detected.

According to the first modification, the switching control of the switch SW1 and the switch SW1 in the second embodiment can be omitted. Further, since the output (touch detection signal Vdet) can be obtained from the two systems at the same time, pressure detection with higher accuracy becomes easy.

(Embodiment 3)
Hereinafter, an embodiment (Embodiment 3) of the present invention, which is partially different from the first and second embodiments, will be described with reference to FIGS. 28 to 30. Regarding the description of the third embodiment, the same reference numerals may be given to the same configurations as those of the first and second embodiments, and the description thereof may be omitted.

FIG. 28 is a schematic wiring diagram showing an arrangement example of the pressure detection units 71 and 72 in the third embodiment. FIG. 29 is a diagram showing an example of the configuration in the vicinity of the pressure detection unit 71 and the pressure detection unit 71 in the third embodiment. FIG. 30 is a diagram showing an example of a specific configuration in the vicinity of the pressure detection unit 72 and the pressure detection unit 72 in the third embodiment. The arrangement of the pressure detection units 71 and 72 in the second embodiment is the same as the arrangement of the pressure detection units 71 and 72 in the first embodiment described with reference to FIG. 9, and the pressure between all the touch detection electrodes TDL and the wiring. Although any of the detection units 71 and 72 is provided, the pressure detection units 71 and 72 may be arranged intermittently. For example, as shown in FIG. 28, pressure detection is performed between a line (first line) in which any of the pressure detection units 71 and 72 is provided between the touch detection electrode TDL and the wiring, and between the touch detection electrode TDL and the wiring. A line (second line) in which the portions 71 and 72 are not provided may be alternately arranged along the extending direction of the drive electrode COML. In this case, as shown in FIGS. 29 and 30, one adjacent first line and one second line are paired, the first line is one system RX1, and the second line is the other system RX2. By treating as, touch detection and pressure detection can be performed in parallel based on the output of the touch detection signal Vdet in the same manner as in the second embodiment. However, in the third embodiment, the interval between the touch detection electrode TDL of the first line and the second line is larger than the interval of the touch detection electrode TDL of one system RX1 and the other system RX2 in the second embodiment. It is desirable to correct the output in consideration of the interval, or adjust the wiring resistance so that each interval is the same.

When the arrangement of the pressure detection units 71 and 72 of the third embodiment as shown in FIG. 28 is adopted, the pressure detection method similar to that of the first embodiment, that is, the touch detection electrode TDL having the pressure detection units 71 and 72 is provided. A method of detecting pressure by measuring the electric resistance value by supplying a voltage may be adopted.

As described above, according to the third embodiment, the same effects as those of the first and second embodiments can be obtained.

(Embodiment 4)
Hereinafter, an embodiment (Embodiment 4) of the present invention, which is partially different from the first to third embodiments, will be described with reference to FIGS. 31 to 35. Regarding the description of the fourth embodiment, the same reference numerals may be given to the same configurations as those of the first to third embodiments, and the description thereof may be omitted.

FIG. 31 is a schematic wiring diagram showing the relationship between the pressure detection units 71 and 72 and the touch detection electrode TDL in the fourth embodiment. FIG. 32 is a diagram showing an example of the configuration in the vicinity of the pressure detection unit 71 and the pressure detection unit 71 in the fourth embodiment. FIG. 33 is a diagram showing an example of a specific configuration in the vicinity of the pressure detection unit 72 and the pressure detection unit 72 in the fourth embodiment. As shown in FIGS. 31 to 33, the wiring connecting the touch detection electrode TDL and the touch detection unit 40 may be provided in two systems, and the pressure detection units 71 and 72 may be provided in one system RX1. In this case, one of the two wiring systems RX1 may be treated as one system RX1 in the second embodiment, and the other system RX2 of the two wiring systems may be treated as the other system RX2 in the second embodiment. it can. The various pressure detection methods described with reference to FIGS. 12 to 17 can be similarly applied to the third embodiment. Specifically, for example, by using one system RX1 as the connecting line Q, various pressure detection methods can be applied.

34 and 35 are schematic views showing a configuration example in which the two systems according to the fourth embodiment are selectively operated. FIG. 34 shows the connection state at the time of touch detection. FIG. 35 shows the connection state at the time of pressure detection. In the fourth embodiment, for example, as shown in FIGS. 34 and 35, a switch SW2 is provided in the connection path between one other system RX2, one A / D conversion unit 43, and the resistance change detection circuit 47, and the other. The system RX2 of the above can be switched so as to be connected to either the A / D conversion unit 43 or the resistance change detection circuit 47. Further, in the fourth embodiment, for example, as shown in FIGS. 34 and 35, a switch SW3 is provided in the connection path between one system RX1 and one resistance change detection circuit 47, and the one system RX1 and the resistor are provided. The connection with the change detection circuit 47 and the non-connection with the change detection circuit 47 can be switched. The resistance change detection circuit 47 detects the pressure by detecting the change in the electrical resistance of the one system RX1 that increases in response to the pressure due to the touch operation, using the other system RX2 as a reference. That is, when the difference in electrical resistance between one system RX1 and the other system RX2 is zero or as small as equal to zero, the result of pressure detection that there is no pressure due to the touch operation can be obtained. Further, when the difference in electrical resistance between one system RX1 and the other system RX2 is significantly larger than zero, the result of pressure detection that the pressure corresponding to the magnitude is applied by the touch operation can be obtained. .. In the fourth embodiment, as shown in FIG. 34, the other system RX2 is connected to the A / D conversion unit 43 at the time of touch detection. Further, in the fourth embodiment, one system RX1 and the other system RX2 are connected to the resistance change detection circuit 47 at the time of pressure detection.

As described above, according to the fourth embodiment, since two systems can be provided for each of the touch detection electrode TDLs, the touch detection signal Vdet that does not pass through the pressure detection units 71 and 72 can be obtained without increasing the number of touch detection electrode TDLs. Obtainable. That is, it becomes easy to increase the output of the touch detection signal Vdet, and it becomes easy to reduce the power consumption related to the output of the touch detection signal Vdet.

(Modification 2)
Hereinafter, modified examples (modification example 2) of the first to fourth embodiments will be described with reference to FIG. 36. Regarding the description of the modified example 2, the same reference numerals may be given to the same configurations as those of the first to fourth embodiments, and the description may be omitted.

FIG. 36 is a diagram showing an example of a specific configuration in the vicinity of the pressure detecting unit 72 and the pressure detecting unit 72 in the modified example 2. As shown in FIG. 36, the structure of the touch detection electrode TDL may be a mesh structure. In FIG. 36, the touch detection electrode TDL has a diamond-shaped mesh structure, but the specific shape of the mesh is arbitrary and can be changed as appropriate. By forming the electrodes such as the touch detection electrode TDL located in the display area into a mesh structure in this way, it is possible to make the touch detection electrode TDL more difficult to visually recognize, and the touch detection electrode TDL visually with respect to the display output. It becomes easier to reduce the impact.

Further, as shown in FIG. 36, the loci drawn by the strain detection pattern constituting the pressure detection unit 72 and the electrode lines forming the folding pattern may be the same as the network structure of the touch detection electrode TDL. Here, by adopting a structure in which the sides constituting the network structure at positions corresponding to the intervals between the plurality of strain detection patterns are not connected, the plurality of strain detection patterns are electrically disconnected in the crossing direction. Therefore, the structure of the pressure detecting unit 72 as described with reference to FIG. 11 can be made into a mesh structure. The mesh structure shown in FIG. 36 does not have a configuration in which the folded pattern is thicker than the strain detection pattern, but the strain detection pattern may have a sufficient length in the detection direction. In this way, by forming the pressure detection unit 72 into a network structure similar to the electrodes provided in the display area such as the touch detection electrode TDL, the visual effect when the pressure detection unit 72 is arranged in the display area can be further enhanced. It becomes easy to reduce. That is, according to the second modification, it becomes easier to arrange the pressure detection unit 72, which was arranged outside the display area in the first to fourth embodiments, inside the display area.

Further, as shown in FIG. 36, a dummy electrode DD whose mesh structure (for example, rhombus) side is cut may be arranged around the touch detection electrode TDL and the pressure detection unit 72. By providing the dummy electrode DD, the configuration in which the arrangement is determined according to the function, such as the touch detection electrode TDL, the pressure detection unit 72, etc., is made a part of the network structure in a wider range including the dummy electrode DD. Can be done. That is, by providing the network structure in a wider area of the display area by the dummy electrode DD, it is possible to make the visual recognition more difficult than when the network structure is locally provided.

Although FIG. 36 illustrates the pressure detection unit 72 to which the network structure is applied, the same network structure can be applied to the pressure detection unit 71.

As described above, according to the modified example 2, since it becomes easier to provide the strain gauges (pressure detecting units 71 and 72) in the display area, it becomes easier to make the frame area thinner.

(Embodiment 5)
Hereinafter, an embodiment (Embodiment 5) of the present invention, which is partially different from the first to fourth embodiments, will be described with reference to FIGS. 37 to 43. Regarding the description of the fifth embodiment, the same components as those of the first to fourth embodiments may be designated by the same reference numerals and the description thereof may be omitted.

FIG. 37 is a diagram showing an example of the module 1A on which the display device with the touch detection function according to the fifth embodiment is mounted. In the fifth embodiment, instead of the touch detection electrode TDL, the touch detection electrode 80, which is a self-capacitance type electrode in which the capacitance of the touch detection electrode changes according to the touch operation on the touch detection surface, is adopted. There is. Specifically, for example, as shown in FIG. 37, a plurality of touch detection electrodes 80 arranged in a two-dimensional matrix in the display region are the drive electrode driver 14 and the drive electrode driver 14 via the wiring formed by using the wiring layer. It is electrically connected to the printed circuit board T. The touch detection electrode 80 transmits an output indicating its own capacitance to the printed circuit board T side according to the drive timing of the drive electrode driver 14. Since the self-capacity changes according to the touch operation on the display area, touch detection can be performed based on the output of the touch detection electrode 80.

The basic principle of the self-capacitating touch detection will be described with reference to FIGS. 38 to 40. FIG. 38 is an explanatory diagram showing a state in which the finger Fi is not in contact with or in close proximity for explaining the basic principle of the self-capacitating touch detection. FIG. 39 is an explanatory diagram showing a state in which the finger Fi is in contact with or close to each other for explaining the basic principle of the self-capacitating touch detection. FIG. 40 is a diagram showing an example of waveforms of a drive signal and a touch detection signal.

As shown in FIG. 38, an AC square wave Sg1 having a predetermined frequency (for example, about several kHz to several hundred kHz) is applied to the touch detection electrode E1 in a state where the finger Fi is not in contact with or close to each other. The touch detection electrode E1 has a capacitance C1, and a current corresponding to the capacitance C1 flows. Voltage detector DETa converts the variation of the current in accordance with the AC rectangular wave Sg1 to variations in the voltage (solid line waveform _{V 4} (see FIG. 40)).

Next, as shown in FIG. 39, the capacitance C2 between the finger Fi and the touch detection is added to the capacitance C1 of the touch detection electrode E1 when the finger Fi is in contact with or in close proximity to the finger Fi. Therefore, when the AC rectangular wave Sg1 is applied to the touch detection electrode E1, a current corresponding to the capacitances C1 and C2 flows. As shown in FIG. 40, the voltage detector DETa converts the variation of the current in accordance with the AC rectangular wave Sg1 to variations in the voltage (the dotted line waveform V _5). Then, the voltage value of the waveform obtained V ₄ and the waveform V ₅ were each integrated, by comparing these values, it is possible to determine the touch detection electrodes E1, contact or whether the proximity of the finger Fi .. In FIG. 40, for the waveform V ₂ and the waveform V ₃ , a method may be used in which the periods until the voltage drops to a predetermined reference voltage are obtained and these periods are compared.

Specifically, as shown in FIGS. 38 and 39, the touch detection electrode E1 has a configuration that can be separated by the switch SWa and the switch SWb. In Figure 40, the AC rectangular wave Sg1 at time _{T 01} raises the voltage level corresponding to the voltage _{V 6.} At this time, the switch SWa is on and the switch SWb is off. Therefore touch detection electrodes E1 also becomes the voltage rise of the voltage V _6. Here, when the switch SWa is turned off, the touch detection electrode E1 is in a floating state, but the contact or proximity of the finger Fi or the like to the capacitance C1 of the touch detection electrode (see FIG. 38) or the capacitance C1 of the touch detection electrode. capacity plus According capacitance C2 (C1 + C2, see Fig. 39) by the touch detection electrode E1 is a voltage _{V 6} is maintained. Moreover, to off after a predetermined time has elapsed to turn on the switch SW3 before the timing of time T ₁₁ to reset the voltage detector DETa. By this reset operation, the output voltage becomes a voltage substantially equal to the reference voltage Vref.

Subsequently, when turning on the switch SWb at time _{T 11,} the voltage detector inverting input is next voltage _{V 6} of the touch detection electrode E1 of DETa, then the capacitance C1 (or C1 + C2) and the voltage of the touch detection electrode E1 According to the time constant of the capacitance C3 in the detector DETa, the inverting input portion of the voltage detector DETa drops to the reference voltage Vref. At this time, since the electric charge accumulated in the capacitance C1 (or C1 + C2) of the touch detection electrode E1 moves to the capacitance C3 in the voltage detector DETa, the output (VdateA) of the voltage detector DETa increases. The output of the voltage detector DETa (VdetA) when the finger Fi or the like to the touch detection electrodes E1 are not in close proximity, next waveform _{V 4} shown by a solid line, and _{R1 = C1 · V 6 / C3} . When capacitance due to influence of finger Fi is added, becomes a waveform _{V 5} shown by a dotted line, the _{VdetA = (C1 + C2) ·} V 6 / C3. After that, the switch SWb is turned off at the timing of time T31 after the charge of the capacitance C1 (or C1 + C2) of the touch detection electrode E1 is sufficiently moved to the capacitance C3, and the switch SWa and the switch SW3 are turned on to detect the touch. The potential of the electrode E1 is set to a low level equal to that of the AC square wave Sg1, and the voltage detector DETa is reset. At this time, the timing to switch SWa ON, after turning off the switch SWb, may be any timing as long as the time T ₀₂ is previously. The timing for resetting the voltage detector DETa is, after turning off the switch SWb, may be any timing as long as the time T ₁₂ before. The above operation is repeated at a predetermined frequency (for example, about several kHz to several hundred kHz). The presence or absence of an external proximity object (presence or absence of touch) can be measured based on the absolute value | ΔV | of the difference between the waveform V ₄ and the waveform V _5. The potential of the touch detection electrode E1, as shown in FIG. 40, when the finger Fi or the like does not close has a waveform of V _2, V when capacitance C2 due to the influence of such a finger Fi is added The waveform is _3. It is also possible to measure the presence / absence of an external proximity object (presence / absence of touch) by measuring the time during which the waveform V ₂ and the waveform V ₃ each drop to a predetermined voltage _VTH.

The various pressure detection methods described with reference to FIGS. 12 to 17 described above can also be applied to the fifth embodiment. Specifically, for example, a connection end U is provided in one of the wiring between the drive electrode driver 14 and the touch detection electrode 80 and the wiring between the touch detection electrode 80 and the printed circuit board T shown in FIG. 37, and is connected to the other. By connecting the wire R, various pressure detection methods can be applied.

The touch detection electrode 80 has a structure for pressure detection. Specifically, the plurality of touch detection electrodes 80 arranged in a two-dimensional matrix include a touch detection electrode 81 provided with a pressure detection unit 71 and a touch detection electrode 82 provided with a pressure detection unit 72. (See FIGS. 41 to 43).

FIG. 41 is a diagram showing an arrangement example of the touch detection electrodes 81 and 82. As shown in FIG. 41, the touch detection electrode 81 and the touch detection electrode 82 are arranged so as to be staggered in the matrix direction.

FIG. 42 is a diagram showing an example of a specific configuration in the vicinity of the pressure detection unit 71 and the pressure detection unit 71 in the fifth embodiment. FIG. 43 is a diagram showing an example of a specific configuration in the vicinity of the pressure detection unit 72 and the pressure detection unit 72 in the fifth embodiment. In FIGS. 42 and 43, the wiring connected to the touch detection electrodes 81 and 82 from the drive electrode driver 14 is not shown. As shown in FIG. 42, for example, the touch detection electrode 81 has a pressure detection unit 71, a self-capacity forming unit 81a which is an electrode formed so as to draw four sides of a rectangle surrounding the pressure detection unit 71, and the like. As shown in FIG. 43, for example, the touch detection electrode 82 has a pressure detection unit 72, a self-capacity forming unit 82a which is an electrode formed so as to draw four sides of a rectangle surrounding the pressure detection unit 72, and the like. The specific shapes of the self-capacity forming portions 81a and 82a can be changed as appropriate.

In the fifth embodiment, the connection is switched in the same manner as the touch detection and the pressure detection in the fourth embodiment described with reference to FIGS. 34 and 35. However, the configuration of the touch detection unit 40 provided on the downstream side of the A / D conversion unit 43 in the fifth embodiment is a configuration in which an algorithm for performing detection by the self-capacity method is implemented. One of the four sides of the self-capacity forming units 81a and 82a has a notch for passing the wiring of one system RX1 continuous with the pressure detecting unit 71, and is connected to the switch SW3. Further, the pressure detecting unit 71 and the self-capacity forming unit 81a share the wiring of the other system RX2 and are connected to the switch SW2.

As described above, according to the fifth embodiment, the strain gauges (pressure detecting units 71 and 72) can be arranged in a matrix in the display area.

(Embodiment 6)
Hereinafter, an embodiment (Embodiment 6) of the present invention, which is partially different from the first to fifth embodiments, will be described with reference to FIGS. 44 to 50. Regarding the description of the sixth embodiment, the same components as those of the first to fifth embodiments may be designated by the same reference numerals and the description thereof may be omitted.

FIG. 44 is a schematic wiring diagram showing an arrangement example of the pressure detection units 91, 92, 93, 94 in the sixth embodiment. The pressure detection units 91, 92, 93, 94 in the sixth embodiment are provided integrally with the drive electrode COML. The various pressure detection methods described with reference to FIGS. 12 to 17 are also applicable to the sixth embodiment. Specifically, for example, various pressure detection methods can be applied by providing the connection ends U on the pressure detection units 91, 92, 93, 94 side of the drive electrode COML and providing the connection line Q on the opposite side. it can.

FIG. 45 is a diagram showing an example of a specific configuration in the vicinity of the pressure detection unit 91 and the pressure detection unit 91. FIG. 46 is a diagram showing an example of a specific configuration in the vicinity of the pressure detection unit 92 and the pressure detection unit 92. The pressure detection units 91 and 92 have a strain detection pattern and a folding pattern similar to those of the pressure detection unit 71 in the detection direction and the crossing direction. As shown in FIGS. 44 and 45, the pressure detection unit 91 is provided so as to be continuous with the drive electrode COML on the end side of the drive electrode COML. As shown in FIGS. 44 and 46, the pressure detection unit 92 is provided on the opposite side of the end portion of the drive electrode COML so as to be continuous with the drive electrode COML. More specifically, one side of the frame area where the pressure detection unit 91 is arranged and one side of the frame area where the pressure detection unit 92 is arranged face each other across the display area.

FIG. 47 is a diagram showing an example of a specific configuration in the vicinity of the pressure detection unit 93 and the pressure detection unit 93. FIG. 48 is a diagram showing an example of a specific configuration in the vicinity of the pressure detection unit 94 and the pressure detection unit 94. The pressure detection units 93 and 94 have a strain detection pattern and a folding pattern similar to those of the pressure detection unit 72 in the detection direction and the crossing direction. As shown in FIGS. 44 and 47, the pressure detection unit 93 is provided so as to be continuous with the drive electrode COML on the end side of the drive electrode COML. As shown in FIGS. 44 and 48, the pressure detection unit 94 is provided on the opposite side of the end portion of the drive electrode COML so as to be continuous with the drive electrode COML. More specifically, one side of the frame area where the pressure detection unit 93 is arranged and one side of the frame area where the pressure detection unit 94 is arranged face each other across the display area.

The pressure detection units 91, 92, 93, 94 of the sixth embodiment are provided as a configuration for performing pressure detection by the same mechanism as that of the first embodiment. That is, the drive electrode COML of the sixth embodiment has a configuration in which a voltage for pressure detection is supplied at the execution timing of pressure detection. The voltage may be supplied by the drive electrode driver 14, or may be supplied by a separate configuration such as the constant voltage circuit 15. The output lines of the pressure detectors 91, 92, 93, 94 for outputting the electrical resistance of the pressure detectors 91, 92, 93, 94 according to the supply of the voltage are in the same layer as the drive electrode COML. It may be formed or may be formed in different layers.

FIG. 49 is a timing chart schematically showing an example of the relationship between the touch detection timing and the pressure detection timing in the sixth embodiment. In FIG. 49, the reference numerals TX1, TX2, and TX3 are attached to the timing charts of the respective drive electrode COMLs for the purpose of distinguishing the operation timings of the three different drive electrode COMLs. Further, the waveform of the timing chart shown in FIG. 49 does not indicate the height of the voltage constituting the signal, but merely indicates the timing. In the sixth embodiment, for example, as shown in FIG. 49, the timing of supplying the drive signal Vcom forming the capacitance with the touch detection electrode TDL at the time of touch detection to the drive electrode COML, and the pressure detection units 91, 92, 93, 94 The timing is different from the timing of supplying the voltage for pressure detection using the drive electrode COML to the drive electrode COML. In FIG. 49, when focusing on the operation of one drive electrode COML, there is a timing in which neither touch detection nor pressure detection is performed, but either touch detection or pressure detection is performed at such a timing. May be good. Further, although the timing chart of the three drive electrode COMLs is illustrated in FIG. 49, the fourth and subsequent drive electrode COMLs also operate at different timings as in the relationship of the three drive electrode COMLs shown in FIG. 49. To do.

FIG. 50 shows an example of the relationship between the synthesized signal forming a capacitance between the touch detection electrode TDL, the drive signal Vcom for touch detection, and the drive signal (voltage supply) for pressure detection. It is a schematic waveform diagram which shows. In the sixth embodiment, for example, as shown in FIGS. 49 and 50, the other drive electrode COML detects the pressure at the timing when a part of the plurality of drive electrode COMLs is supplied with the drive signal Vcom for touch detection. It may be supplied with a voltage for. Therefore, when viewed from the touch detection electrode TDL side, as shown in FIG. 50, a signal in which the drive signal Vcom and the voltage for pressure detection are combined is provided from the plurality of drive electrodes COML. Here, the potential difference caused by the increase in voltage accompanying the supply of the voltage used for pressure detection is significantly lower than the potential difference in the voltage ascending / descending pattern indicated by the drive signal Vcom used for touch detection. Therefore, as shown in FIG. 50, even in the synthesized signal, the potential difference of the voltage ascending / descending pattern generated by the drive signal Vcom used for touch detection can be sufficiently identified. In the sixth embodiment, among the synthesized signals, the signal is corrected in consideration of the potential difference (D) brought about by the supply of the voltage for pressure detection. The correction is performed by, for example, the signal processing unit 44, but a dedicated configuration may be performed.

The sixth embodiment can be applied to any display device with a touch detection function of the mutual capacitance method or the self-capacity method, but when the sixth embodiment is applied, the pressure detection unit 71 described in the first to fifth embodiments is described. , 72 are omitted. Further, the sixth embodiment is applicable as long as it has a configuration having a drive electrode COML, and may be a display device having no touch detection function. In that case, the configuration related to touch detection such as the touch detection electrode TDL is omitted. As described above, the display device according to the sixth embodiment includes a strain gauge (for example, pressure detection units 91, 92, 93, 94) provided integrally with the drive electrode used for driving the pixel.

As described above, according to the sixth embodiment, the strain gauge (for example, the pressure detection units 91, 92, 93, 94) is provided integrally with the drive electrode used for driving the pixel, so that the configuration related to the display and the pressure detection can be used. Such a configuration can be integrated. The pressure can be detected in a configuration integrated with parts used in other configurations (configuration related to display).

(Modification example 3)
Hereinafter, a modified example of the sixth embodiment (modified example 3) will be described with reference to FIGS. 51 to 55. Regarding the description of the modified example 3, the same reference numerals may be given to the same configurations as those of the sixth embodiment, and the description may be omitted.

FIG. 51 is a schematic wiring diagram showing an arrangement example of the pressure detection units 91A, 92A, 93A, 94A in the modified example 3. FIG. 52 is a diagram showing an example of a specific configuration in the vicinity of the pressure detection unit 91A and the pressure detection unit 91A. FIG. 53 is a diagram showing an example of a specific configuration in the vicinity of the pressure detection unit 92A and the pressure detection unit 92A. FIG. 54 is a diagram showing an example of a specific configuration in the vicinity of the pressure detection unit 93A and the pressure detection unit 93A. FIG. 55 is a diagram showing an example of a specific configuration in the vicinity of the pressure detection unit 94A and the pressure detection unit 94A. The arrangement of the pressure detection units 91A, 92A, 93A, 94A in the third modification is the same as the arrangement of the pressure detection units 91, 92, 93, 94 in the sixth embodiment. However, in the sixth embodiment, the output lines of the pressure detection units 91, 92, 93, 94 for outputting the electric resistance of the pressure detection units 91, 92, 93, 94 according to the supply of voltage are the drive electrode COML. Although the wiring was separate, the pressure detection units 91A, 92A, 93A, 94A of the modified example 3 also serve as the drive electrode COML as shown in FIGS. 52 to 55.

Specifically, in the modified example 3, as shown in FIG. 51, for example, a drive electrode driver 14 and a relay portion 14a are provided on both ends of the drive electrode COML located so as to face each other with the display region interposed therebetween. The relay unit 14a is configured to apply the drive signal Vcom from the drive electrode driver 14 to the drive electrode COML from the end side of the drive electrode COML at a position facing the drive electrode driver 14 with the display region interposed therebetween. The relay unit 14a is connected to, for example, a wiring for transmitting a drive signal Vcom from the drive electrode driver 14 to the end side of the drive electrode COML at a position facing the drive electrode driver 14 with the display region interposed therebetween. The relay unit 14a may be a drive electrode driver provided separately from the drive electrode driver 14. It should be noted that the various pressure detection methods described with reference to FIGS. 12 to 17 described above can be applied to the modified example 3 as in the sixth embodiment.

In the third modification, the drive signal Vcom reaches the drive electrode COML in the display region through the pressure detection unit (any of the pressure detection units 91A, 92A, 93A, 94A) provided integrally with the drive electrode COML. .. Specifically, the drive signal Vcom from the relay unit 14a is sent to the drive electrode COML provided integrally with the pressure detection units 91A and 93A and the pressure detection units 91A and 93A provided on the relay unit 14a side. Be supplied. Further, the drive signal Vcom from the drive electrode driver 14 is supplied to the drive electrode COML provided integrally with the pressure detection units 92A and 94A and the pressure detection units 92A and 94A provided on the drive electrode driver 14 side. Will be done.

As described above, according to the modified example 3, each electric system of the drive electrode COML can be integrated into one system.

(Modification example 4)
Hereinafter, a modified example of the sixth embodiment (modified example 4) will be described with reference to FIG. 56. Regarding the description of the modified example 4, the same reference numerals may be given to the same configurations as those of the sixth embodiment, and the description may be omitted.

FIG. 56 is a timing chart schematically showing an example of the relationship between the drive timing of the drive electrode COML at the time of touch detection in the modified example 4 and the touch detection timing by the touch detection electrode TDL. In FIG. 56, the symbols RXa, RXb, and RXc are added to the timing charts of the touch detection electrodes TDL for the purpose of distinguishing the touch detection timings of the three different touch detection electrodes TDL. Also in the sixth embodiment, the touch detection and the pressure detection can be performed in parallel by using the touch detection signal Vdet by the capacitance type touch detection. Specifically, for example, as shown in FIG. 56, when the drive signal Vcom is supplied to one of the drive electrodes COML at the time of touch detection, the touch detection electrode TDL starts at a timing later than the supply timing of the drive electrode COML. The touch detection signal Vdet will be output. Here, when pressure is applied by touch operation, the electrical resistance of the drive electrode provided with the pressure detection unit (for example, pressure detection unit 91, 92, 93, 94) is larger than that when there is no pressure. Become. Therefore, when the pressure due to the touch operation is applied, the deviation between the supply timing of the drive electrode COML at the time of touch detection and the output timing of the touch detection signal Vdet becomes larger than when there is no pressure. FIG. 56 shows the supply of the drive electrode COML when there is pressure due to the touch operation, as compared with the deviation between the supply timings S1 and S2 of the drive electrode COML when there is no pressure and the output timings R1 and R2 of the touch detection signal Vdet. It is illustrated that the deviation between the timing S3 and the output timing R3 of the touch detection signal Vdet is large.

The process related to pressure detection described with reference to FIG. 56 is performed by, for example, the signal processing unit 44. That is, the touch detection unit 40 in the modified example 4 functions as a detection unit that detects the pressure based on the output timing of the drive signal forming the electric field and the output timing of the touch detection by the touch detection electrode. Further, in the modified example 4 for performing such pressure detection, as in the first embodiment, the drive electrode is provided at a position where the touch detection electrode is not in contact with the touch detection electrode, and an electric field is formed between the touch detection electrode and the touch detection electrode according to the drive signal. It is premised on doing.

As described above, according to the modification 4, the pressure can be detected at the same time as the touch detection. Therefore, there is no need to supply a voltage for pressure detection to the strain gauges (pressure detection units 91A, 92A, 93A, 94A) at a timing different from the touch detection timing, and there are no restrictions on the timing, so that the constant voltage circuit 15 and the like can be used. It can be omitted.

Although the first to sixth embodiments and the first to fourth embodiments have been described above by way of example, the specific configuration of the present invention can be appropriately changed within the range specified by the matters specifying the invention described in the claims. Is. For example, in the first embodiment and the like, a so-called in-cell method in which the drive electrode COML is shared between the configuration related to touch detection and the configuration related to display output is adopted, but a so-called on-cell method in which the drive electrode COML is not shared may be adopted. ..

In the case of the on-cell method and the out-cell method, the drive electrode COML used for at least one of touch detection and pressure detection in the first embodiment and the like is provided as a configuration separate from the drive electrode COML provided on the first substrate 2. The presence or absence of a display device is arbitrary. That is, the detection device may be, for example, a device having only the configuration related to the operation of the touch detection device 30 and the touch detection device 30 in the first embodiment and the like. When a display device is provided, the specific configuration of the display device is arbitrary. For example, the display device may be a display device other than a liquid crystal display, such as an organic EL display.

FIG. 57 is a diagram showing an example of the cross-sectional structure of the organic EL display. In the image display panel 40, pixels 48 are arranged in a two-dimensional matrix in the row direction and the column direction, and an image is displayed for each display frame.

The pixel 48 includes a plurality of sub-pixels 49. The lighting drive circuit includes a control transistor, a drive transistor, and a charge holding capacitor. The gate of the control transistor is connected to the scan line, the source is connected to the signal line, and the drain is connected to the gate of the drive transistor. One end of the charge holding capacitor is connected to the gate of the drive transistor and the other end is connected to the source of the drive transistor. The source of the drive transistor is connected to the power supply line, and the drain of the drive transistor is connected to the anode of the organic light emitting diode which is a self-luminous body. The cathode of the organic light emitting diode is connected to, for example, a reference potential (eg, ground). The control transistor is, for example, an n-channel transistor, and the drive transistor is, for example, a p-channel transistor, but the polarity of each transistor is not limited to this. If necessary, the polarities of the control transistor and the drive transistor may be determined.

The pixel 48 has, for example, a first sub-pixel 49R, a second sub-pixel 49G, a third sub-pixel 49B, and a fourth sub-pixel 49W. The first sub-pixel 49R, the second sub-pixel 49G, the third sub-pixel 49B, and the fourth sub-pixel 49W are arranged in a stripe shape along one direction, for example. The first sub-pixel 49R displays the primary color red as the first color. The second sub-pixel 49G displays the primary color green as the second color. The third sub-pixel 49B displays the primary color blue as the third color. The fourth sub-pixel 49W displays white as a fourth color different from the first color, the second color, and the third color. However, the first color, the second color, the third color, and the fourth color are not limited to red, green, blue, and white, respectively, and any color such as a complementary color can be selected.

As shown in FIG. 57, the image display panel 40 includes a substrate 51, insulating layers 52 and 53, a reflective layer 54, a lower electrode 55, a self-luminous layer 56, an upper electrode 57, and an insulating layer 58. It includes an insulating layer 59, a color filter 61 as a color conversion layer, a black matrix 62 as a light-shielding layer, and a substrate 50. The substrate 51 is a semiconductor substrate such as silicon, a glass substrate, a resin substrate, or the like, and forms or holds the above-mentioned lighting drive circuit or the like. The insulating layer 52 is a protective film that protects the above-mentioned lighting drive circuit and the like, and silicon oxide, silicon nitride, or the like can be used. The lower electrode 55 is provided on each of the first sub-pixel 49R, the second sub-pixel 49G, the third sub-pixel 49B, and the fourth sub-pixel 49W, and the anode of the organic light emitting diode described above. It is a conductor. The lower electrode 55 is a translucent electrode formed of a translucent conductive material (translucent conductive oxide) such as Indium Tin Oxide (ITO). The insulating layer 53 is called a bank, and is an insulating layer that partitions the first sub-pixel 49R, the second sub-pixel 49G, the third sub-pixel 49B, and the fourth sub-pixel 49W. The reflective layer 54 is made of a metallic luster material that reflects light from the self-luminous layer 56, such as silver, aluminum, or gold. The self-luminous layer 56 contains an organic material, and includes a hole injection layer, a hole transport layer, a light emitting layer, an electron transport layer, and an electron injection layer (not shown).

(Hall transportation layer)
As the layer that generates holes, for example, it is preferable to use a layer containing an aromatic amine compound and a substance exhibiting electron acceptability for the compound. Here, the aromatic amine compound is a substance having an arylamine skeleton. Among the aromatic amine compounds, those containing triphenylamine in the skeleton and having a molecular weight of 400 or more are particularly preferable. Further, among aromatic amine compounds having triphenylamine in the skeleton, those containing a fused aromatic ring such as a naphthyl group in the skeleton are particularly preferable. By using an aromatic amine compound whose skeleton contains triphenylamine and a condensed aromatic ring, the heat resistance of the light emitting element is improved. Specific examples of the aromatic amine compound include, for example, 4,4'-bis [N- (1-naphthyl) -N-phenylamino] biphenyl (abbreviation: α-NPD), 4,4'-bis [N- (3-Methylphenyl) -N-phenylamino] Biphenyl (abbreviation: TPD), 4,4', 4''-tris (N, N-diphenylamino) triphenylamine (abbreviation: TDATA), 4,4' , 4''-Tris [N- (3-methylphenyl) -N-phenylamino] triphenylamine (abbreviation: MTDATA), 4,4'-bis [N- {4- (N, N-di-m) -Trillamino) phenyl} -N-phenylamino] biphenyl (abbreviation: DNTPD), 1,3,5-tris [N, N-di (m-tolyl) amino] benzene (abbreviation: m-MTDAB), 4,4 ', 4''-Tris (N-carbazolyl) triphenylamine (abbreviation: TCTA), 2,3-bis (4-diphenylaminophenyl) quinoxaline (abbreviation: TPAQn), 2,2', 3,3'- Tetrakiss (4-diphenylaminophenyl) -6,6'-bisquinoxalin (abbreviation: D-TriPhAQn), 2,3-bis {4- [N- (1-naphthyl) -N-phenylamino] phenyl} -dibenzo [F, h] Kinoxalin (abbreviation: NPADiBzQn) and the like can be mentioned. The substance exhibiting electron acceptability with respect to the aromatic amine compound is not particularly limited, and for example, molybdenum oxide, vanadium oxide, 7,7,8,8-tetracyanoquinodimethane (abbreviation: TCNQ), and the like. 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane (abbreviation: F4-TCNQ) and the like can be used.

(Electron injection layer, electron transport layer)
The electron transporting substance is not particularly limited, and for example, tris (8-quinolinolato) aluminum (abbreviation: Alq ₃ ), tris (4-methyl-8-quinolinolato) aluminum (abbreviation: Almq ₃ ), bis (10-hydroxybenzo). [H] -Kinolinato) berylium (abbreviation: BeBq ₂ ), bis (2-methyl-8-quinolinolato) -4-phenylphenylato-aluminum (abbreviation: BAlq), bis [2- (2-hydroxyphenyl) benzoxa Zorato] Zinc (abbreviation: Zn (BOX) ₂ ), Bis [2- (2-hydroxyphenyl) benzothiazolato] Zinc (abbreviation: Zn (BTZ) ₂ ) and other metal complexes, as well as 2- (4-biphenylyl) -5- (4-tert-butylphenyl) -1,3,4-oxadiazole (abbreviation: PBD), 1,3-bis [5- (p-tert-butylphenyl) -1,3,4- Oxadiazole-2-yl] benzene (abbreviation: OXD-7), 3- (4-tert-butylphenyl) -4-phenyl-5- (4-biphenylyl) -1,2,4-triazole (abbreviation: abbreviation: TAZ), 3- (4-tert-butylphenyl) -4- (4-ethylphenyl) -5- (4-biphenylyl) -1,2,4-triazole (abbreviation: p-EtTAZ), vasophenantroline (abbreviation) : BPhen), vasocuproin (abbreviation: BCP) and the like can be used. Further, there is no particular limitation on the substance that exhibits electron donating property to the electron transporting substance, and for example, alkali metals such as lithium and cesium, alkaline earth metals such as magnesium and calcium, rare earth metals such as erbium and ytterbium, and the like. Can be used. Further, alkali metal oxides and alkalis such as lithium oxide (Li ₂ O), calcium oxide (CaO), sodium oxide (Na ₂ O), potassium oxide (K ₂ O), magnesium oxide (Mg O), etc. A substance selected from earth metal oxides may be used as a substance exhibiting electron donating property with respect to an electron transporting substance.

(Light emitting layer)
For example, when it is desired to obtain reddish luminescence, 4-dicyanomethylene-2-isopropyl-6- [2- (1,1,7,7-tetramethyldurolysin-9-yl) ethenyl] -4H-pyran ( Abbreviation: DCJTI), 4-dicyanomethylene-2-methyl-6- [2- (1,1,7,7-tetramethyldurolysin-9-yl) ethenyl] -4H-pyran (abbreviation: DCJT), 4 -Dicyanomethylene-2-tert-butyl-6- [2- (1,1,7,7-tetramethyldurolysin-9-yl) ethenyl] -4H-pyran (abbreviation: DCJTB) and perifrantene, 2,5 -Dicyano-1,4-bis [2- (10-methoxy-1,1,7,7-tetramethyldurolysin-9-yl) ethenyl] benzene, etc., emits light having a peak in the emission spectrum from 600 nm to 680 nm. The substance to be presented can be used. When you want to obtain greenish emission, N, N'-dimethylquinacridone (abbreviation: DMQd), coumarin 6 or coumarin 545T, tris (8-quinolinolato) aluminum (abbreviation: Alq ₃ ), etc. emit light from 500 nm to 550 nm. A substance exhibiting luminescence having a peak in the spectrum can be used. If you want to obtain bluish luminescence, 9,10-bis (2-naphthyl) -tert-butylanthracene (abbreviation: t-BuDNA), 9,9'-bianthracene, 9,10-diphenylanthracene (abbreviation). : DPA), 9,10-bis (2-naphthyl) anthracene (abbreviation: DNA), bis (2-methyl-8-quinolinolato) -4-phenylphenylato-gallium (abbreviation: BGaq), bis (2-methyl) A substance that emits light having a peak in the emission spectrum from 420 nm to 500 nm, such as -8-quinolinolato) -4-phenylphenylato-aluminum (abbreviation: BAlq), can be used. As described above, in addition to the substance that emits fluorescence, bis [2- (3,5-bis (trifluoromethyl) phenyl) pyridinato-N, C2'] iridium (III) picolinate (abbreviation: Ir (CF3ppy) ₂ (Pic)), bis [2- (4,6-difluorophenyl) pyridinato-N, C2'] iridium (III) acetylacetonate (abbreviation: FIR (acac)), bis [2- (4,6-difluoro) Phenyl) Pyridinato-N, C2'] Iridium (III) Picolinate (FIr (pic)), Tris (2-phenylpyridinato-N, C2') Iridium (abbreviation: Ir (ppy) ₃ ), etc. The substance to be used can also be used as a luminescent substance.

The upper electrode 57 is a translucent electrode formed of a translucent conductive material (translucent conductive oxide) such as Indium Tin Oxide (ITO). In the sixth embodiment, ITO is mentioned as an example of the translucent conductive material, but the present invention is not limited to this. As the translucent conductive material, a conductive material having another composition such as Indium Zinc Oxide (IZO) may be used. The upper electrode 57 serves as the cathode of the organic light emitting diode. The insulating layer 58 is a sealing layer that seals the above-mentioned upper electrode 57, and silicon oxide, silicon nitride, or the like can be used. The insulating layer 59 is a flattening layer that suppresses a step caused by a bank, and silicon oxide, silicon nitride, or the like can be used. The substrate 50 is a translucent substrate that protects the entire image display panel 40, and for example, a glass substrate can be used. Note that FIG. 57 shows an example in which the lower electrode 55 is an anode (anode) and the upper electrode 57 is a cathode (cathode), but the present invention is not limited to this. The lower electrode 55 may be the cathode and the upper electrode 57 may be the anode. In that case, the polarity of the driving transistor electrically connected to the lower electrode 55 can be appropriately changed, and carrier injection can be performed. It is also possible to appropriately change the stacking order of the layers (hole injection layer and electron injection layer), carrier transport layer (hole transport layer and electron transport layer), and light emitting layer.

When the electrode of the display device and the strain gauge are integrated as in the sixth embodiment and the third modification, for example, the upper electrode 57 has a pressure similar to that of the drive electrode COML in the sixth embodiment and the third modification. It has a configuration integrated with a detection unit (for example, pressure detection units 91, 92, 93, 94 or pressure detection units 91A, 92A, 93A, 94A).

The image display panel 40 is a color display panel, and is a color filter that allows light of a color corresponding to the color of the sub-pixel 49 to pass between the sub-pixel 49 and the image observer among the light emitting components of the self-luminous layer 56. 61 is arranged. The image display panel 40 can emit light of colors corresponding to red, green, blue, and white. The color filter 61 may not be arranged between the fourth sub-pixel 49W corresponding to white and the image observer. Further, in the image display panel 40, the light emitting component of the self-luminous layer 56 does not pass through a color conversion layer such as a color filter 61, and the first sub-pixel 49R, the second sub-pixel 49G, the third sub-pixel 49B, and the fourth sub-pixel It is also possible to emit each color of 49W. For example, in the image display panel 40, the fourth sub-pixel 49W may be provided with a transparent resin layer instead of the color filter 61 for color adjustment. By providing the transparent resin layer on the image display panel 40 in this way, it is possible to prevent a large step from being generated in the fourth sub-pixel 49W. As the fourth sub-pixel 49W, instead of the white sub-pixel, another high-brightness color, for example, a yellow sub-pixel may be used. When a yellow sub-pixel is used as the fourth sub-pixel 49W, a white self-luminous layer 56 and a yellow color filter 61 may be arranged, or a self-luminous layer that emits yellow light is used as the self-luminous layer 56. You may.

Other effects brought about by the above-described aspects that are clear from the description of the present specification, or that can be appropriately conceived by those skilled in the art, are naturally understood to be brought about by the present invention.

1 Display device with touch detection function 2 1st board 3 2nd board 6 Liquid crystal layer 10 Display device with touch detection function 11 Control unit 12 Gate driver 13 Source driver 14 Drive electrode driver 15 Constant voltage circuit 20 Liquid crystal display device 21 Glass substrate 22 Pixel electrode 24 Insulation layer 30 Touch detection device 32 Color filter 32R, 32G, 32B Color region 35 Plate plate 40 Touch detection unit 42 Amplification unit 43 A / D conversion unit 44 Signal processing unit 45 Coordinate calculation unit 46 Detection timing control unit 101 Current Measuring unit 102 Pressure calculation unit 71, 72, 91, 92, 93, 94, 91A, 92A, 93A, 94A Pressure detection unit 80, 81, 82 Touch detection electrode COML Drive electrode DD Dummy electrode GCL Scanning line Pix pixel RX1 One System RX2 Other system SGL Signal line SPix Sub-pixel T printed circuit board

Claims (16)

A plurality of touch detection electrodes provided along the touch detection surface,
With multiple strain gauges
With the detection circuit
With multiple first wires
Equipped with multiple second wires,
Each of the plurality of first wirings is connected to a first end portion of the touch detection electrode connected to the corresponding touch detection electrode and one end of the plurality of strain gauges corresponding to the corresponding strain gauge. With two ends,
Each of the plurality of second wirings is provided so as to correspond to each of the plurality of first wirings, and is connected to the detection circuit with a third end portion connected to the other end of the corresponding strain gauge. With a 4th end
The detection circuit is a detection device that detects the pressure received by the touch detection surface based on the electrical resistance between the second end and the fourth end. Each has a plurality of drive electrodes extending in the first direction and arranged so as to line up in the second direction intersecting the first direction.
Each of the plurality of touch detection electrodes extends in the second direction and is arranged so as to intersect the drive electrode.
The detection device according to claim 1, wherein the touch detection electrode detects a touch operation received by the touch detection surface based on a mutual capacitance type capacitance generated in response to a drive signal applied to the drive electrode. The plurality of strain gauges include a first strain gauge and a second strain gauge.
The first strain gauge has a continuous wiring pattern so that a plurality of strain detection patterns along the first direction are lined up along the second direction.
The second strain gauge has a continuous wiring pattern so that a plurality of strain detection patterns along the second direction are lined up along the first direction.
The detection device according to claim 2, wherein the first strain gauge and the second strain gauge are alternately arranged in the first direction. The touch detection surface has a first side and a second side along the first direction, and has two regions including a first region adjacent to the first side and a second region adjacent to the second side. And
The touch detection electrode has a first touch detection electrode extending along the first side in the touch detection surface and a second touch detection electrode extending along the second side in the touch detection surface. ,
Each of the first touch detection electrodes is connected to one of the strain gauges provided in the first region.
The detection device according to claim 3, wherein each of the second touch detection electrodes is connected to one of the strain gauges provided in the second region. The detection device according to claim 1, wherein the plurality of touch detection electrodes are arranged in a matrix in the touch detection surface, and detect a touch operation received by the touch detection surface based on a self-capacitance type capacitance. The detection device according to claim 5, wherein each of the plurality of touch detection electrodes has a shape surrounding one strain gauge. The plurality of strain gauges include a first strain gauge and a second strain gauge.
The first strain gauge has a continuous wiring pattern so that a plurality of strain detection patterns along the first direction are lined up along a second direction intersecting with the first direction.
The second strain gauge has a continuous wiring pattern so that a plurality of strain detection patterns along the second direction are lined up along the first direction.
The detection device according to claim 5 or 6, wherein the first strain gauge and the second strain gauge are alternately arranged in the first direction. The detection device according to claim 7, wherein the first strain gauge and the second strain gauge are alternately arranged in both the first direction and the second direction. A display device including a display panel for displaying an image and a detection unit.
The detection unit
A plurality of touch detection electrodes provided along the touch detection surface provided so as to cover the display surface of the image by the display panel, and
With multiple strain gauges
With the detection circuit
With multiple first wires
Equipped with multiple second wires,
Each of the plurality of first wirings is connected to a first end portion of the touch detection electrode connected to the corresponding touch detection electrode and one end of the plurality of strain gauges corresponding to the corresponding strain gauge. With two ends,
Each of the plurality of second wirings is provided so as to correspond to each of the plurality of first wirings, and is connected to the detection circuit with a third end portion connected to the other end of the corresponding strain gauge. With a 4th end
The detection circuit is a display device that detects the pressure received by the touch detection surface based on the electrical resistance between the second end and the fourth end. Each has a plurality of drive electrodes extending in the first direction and arranged so as to line up in the second direction intersecting the first direction.
Each of the plurality of touch detection electrodes extends in the second direction and is arranged so as to intersect the drive electrode.
The display device according to claim 9, wherein the touch detection electrode detects a touch operation received by the touch detection surface based on a mutual capacitance type capacitance generated in response to a drive signal applied to the drive electrode. The plurality of strain gauges include a first strain gauge and a second strain gauge.
The first strain gauge has a continuous wiring pattern so that a plurality of strain detection patterns along the first direction are lined up along the second direction.
The second strain gauge has a continuous wiring pattern so that a plurality of strain detection patterns along the second direction are lined up along the first direction.
The display device according to claim 10, wherein the first strain gauge and the second strain gauge are alternately arranged in the first direction. The touch detection surface has a first side and a second side along the first direction, and has two regions including a first region adjacent to the first side and a second region adjacent to the second side. And
The touch detection electrode has a first touch detection electrode extending along the first side in the touch detection surface and a second touch detection electrode extending along the second side in the touch detection surface. ,
Each of the first touch detection electrodes is connected to one of the strain gauges provided in the first region.
The display device according to claim 11, wherein each of the second touch detection electrodes is connected to one of the strain gauges provided in the second region. The display device according to claim 9, wherein the plurality of touch detection electrodes are arranged in a matrix in the touch detection surface, and detect a touch operation received by the touch detection surface based on a self-capacitance type capacitance. The display device according to claim 13, wherein each of the plurality of touch detection electrodes has a shape surrounding one strain gauge. The plurality of strain gauges include a first strain gauge and a second strain gauge.
The first strain gauge has a continuous wiring pattern so that a plurality of strain detection patterns along the first direction are lined up along a second direction intersecting with the first direction.
The second strain gauge has a continuous wiring pattern so that a plurality of strain detection patterns along the second direction are lined up along the first direction.
The display device according to claim 13 or 14, wherein the first strain gauge and the second strain gauge are alternately arranged in the first direction. The display device according to claim 15, wherein the first strain gauge and the second strain gauge are alternately arranged in both the first direction and the second direction.

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