JP7622157B2 - Display device - Google Patents

Description

An embodiment of the present invention relates to a display device.

In recent years, touch sensors (touch detection devices) have been used as interfaces for display devices. The touch sensor has a plurality of first detection electrodes provided in a detection area, a plurality of second detection electrodes provided in the detection area intersecting the first detection electrodes, and an insulating layer provided between the first detection electrodes and the second detection electrodes. In addition, a plurality of first wirings connected to the plurality of first detection electrodes are provided in an outer area (frame area) located outside the detection area. Similarly, a plurality of second wirings connected to the second detection electrodes are provided in the outer area (frame area) and extend overlapping the first wirings.

JP 2013-105275 A

In the above-mentioned touch sensor, the first wiring and the second wiring have a portion that is overlapped and parallel to each other or arranged side by side in parallel. Therefore, coupling (parasitic capacitance) is likely to occur between the first wiring and the second wiring. This coupling appears as noise in touch detection and may deteriorate the touch detection.
An object of the embodiments is to provide a touch detection device capable of reducing coupling between wirings and improving detection performance, and a display device including the same.

A display device according to an embodiment includes a display panel including a first substrate having a display region including a plurality of pixels and a non-display region, and a touch detection device provided on the display panel. The touch detection device includes a plurality of first detection electrodes provided to overlap the display region, a plurality of second detection electrodes provided to overlap the display region and intersecting the first detection electrodes via an insulating layer, a plurality of first control wirings provided in the non-display region and connected to the first detection electrodes, and a plurality of second control wirings provided in the non-display region and connected to the second detection electrodes, the first control wirings being connected to the first detection electrodes via switches including a plurality of switching elements. The line width of the first control wirings is narrower than the width of the first detection electrodes and the line width of the second control wirings.

FIG. 1 is a perspective view showing a display device according to a first embodiment. FIG. 2 is a plan view that illustrates a touch detection device (touch sensor) provided in the display device. FIG. 3 is a block diagram illustrating an example of a Tx drive circuit of a touch sensor. FIG. 4 is a timing chart showing drive timing of the touch sensor. FIG. 5 is a plan view that illustrates a schematic arrangement of first control wiring and second control wiring between a switch in a Tx drive circuit and a Tx scanner. 6A is a cross-sectional view of the display panel taken along line BB in FIG. 6B is a cross-sectional view of the control wiring taken along line BB in FIG. 5. FIG. FIG. 7 is a plan view illustrating a schematic arrangement of signal lines provided in a non-display area of a first substrate. FIG. 8A is a plan view illustrating a schematic arrangement of first control wirings and second control wirings in a Tx drive circuit of a touch detection device according to a first modified example. 8B is a cross-sectional view of the control wiring taken along line CC in FIG. 8A. FIG. 9A is a plan view illustrating a schematic arrangement of first control wirings and second control wirings in a Tx drive circuit of a touch detection device according to a second modified example. 9B is a cross-sectional view of the control wiring taken along line DD in FIG. 9A. FIG. 10A is a plan view illustrating a schematic arrangement of first control wirings and second control wirings in a Tx drive circuit of a touch detection device according to a third modified example. 10B is a cross-sectional view of the control wiring taken along line EE in FIG. 10A. FIG. 11A is a plan view illustrating a schematic arrangement of first control wirings and second control wirings in a Tx drive circuit of a touch detection device according to a fourth modified example. 11B is a cross-sectional view of the arrangement structure according to the fifth modified example taken along line FF in FIG. 11A. FIG. 12 is a plan view illustrating a schematic arrangement of first control wirings and second control wirings in a Tx drive circuit of a touch detection device according to a fifth modified example. FIG. 13 is a plan view illustrating a schematic arrangement of first control wirings and second control wirings in a Tx drive circuit of a touch detection device according to a sixth modified example. FIG. 14 is a cross-sectional view of the sixth modified arrangement structure taken along line G--G in FIG. FIG. 15 is a plan view that illustrates a schematic electrode structure and a wiring structure of a touch detection device in a display device according to a second embodiment. FIG. 16 is a plan view illustrating an example of a wiring structure according to the second embodiment. FIG. 17 is a plan view illustrating a seventh modification of the wiring structure according to the second embodiment. FIG. 18 is a plan view illustrating an eighth modification of the wiring structure according to the second embodiment. FIG. 19 is a cross-sectional view of a display device and a touch detection device according to a third embodiment. FIG. 20 is a plan view that illustrates a schematic electrode structure and a wiring structure of a touch detection device according to a third embodiment. FIG. 21 is a plan view roughly showing a ninth modification of the wiring structure in the third embodiment.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.
The disclosure is merely an example, and appropriate modifications that are within the spirit of the invention and that can be easily conceived by a person skilled in the art are naturally included in the scope of the present invention. In addition, in order to make the explanation clearer, the width, thickness, shape, etc. of each part may be shown diagrammatically compared to the actual embodiment, but these are merely examples and do not limit the interpretation of the present invention. In this specification and each figure, elements similar to those described above with respect to the previous figures may be given the same reference numerals, and detailed explanations may be omitted as appropriate.

(First embodiment)
FIG. 1 is a perspective view illustrating a display device according to a first embodiment.
A liquid crystal display device will be described as an example of the display device 10. The display device 10 can be incorporated into various electronic devices such as smartphones, tablet terminals, mobile phones, notebook type PCs, portable game consoles, video cameras, electronic dictionaries, in-vehicle devices, or television receivers. The main configuration disclosed in this embodiment can also be applied to a self-luminous display device having an organic electroluminescence display element or the like, an electronic paper display device having an electrophoretic element or the like, a display device using MEMS (Micro Electro Mechanical Systems), or a display device using electrochromism.

As shown in FIG. 1, the display device 10 includes an active matrix display panel (liquid crystal display panel) 12, a driving IC chip (driving element) 14 that drives the display panel 12, a touch sensor (touch detection device) 16 that detects the approach or contact of an object to be detected, for example, a finger, a touch control IC (driving element) 18 that drives the touch sensor 16, and a first flexible wiring board (FPC) 20 and a second flexible wiring board (FPC) 22 that are joined to the display panel 12. The driving IC chip 14 is mounted on the display panel 12. The touch control IC 18 is mounted on, for example, the second FPC 22, and is connected to the first FPC 20 and the driving IC chip 14 via a connector 24.

The display panel 12 comprises a rectangular flat first substrate (array substrate) SUB1, a rectangular flat second substrate (counter substrate) SUB2 arranged opposite the first substrate SUB1, and a liquid crystal layer (liquid crystal layer LQ described below) held between the first substrate SUB1 and the second substrate SUB2. The first substrate SUB1 and the second substrate SUB2 are formed using an insulating substrate (insulating layer) having optical transparency, such as a glass substrate or a resin substrate. The first substrate SUB1 and the second substrate SUB2 are bonded together by a seal material SE with a predetermined cell gap formed between them. The liquid crystal layer LQ is held inside the cell gap between the first substrate SUB1 and the second substrate SUB2, surrounded by the seal material SE.

The display panel 12 includes a display area DA for displaying an image and a frame-shaped non-display area ED surrounding the display area DA in an area inside the sealant SE in a plan view (referring to a state in which the display panel 12 is viewed from a direction perpendicular to the display panel 12; the same applies below). In this embodiment, the display area DA also serves as a touch detection area for detecting the approach and touch of a finger or the like. The non-display area ED also serves as a non-detection area.
The display panel 12 includes a plurality of pixels PX arranged in a matrix in a display area DA. In the display area DA, the first substrate SUB1 includes source lines S extending in a first direction X, gate lines G extending in a second direction Y perpendicular to the first direction X, switching elements SW electrically connected to the gate lines G and the source lines S in each pixel PX, and pixel electrodes PE connected to the switching elements SW in each pixel PX. A common electrode CE of a common potential is provided on the first substrate SUB1 or the second substrate SUB2 and faces the plurality of pixel electrodes PE. The gate lines G do not have to be formed in a straight line parallel to the first direction X, and the source lines S do not have to be formed in a straight line parallel to the second direction Y. That is, the gate lines G and the source lines S may be bent or partially branched.

The display panel 12 is, for example, a transmissive type having a transmissive display function of displaying an image by selectively transmitting light from a backlight device. Note that the display panel 12 may be a reflective type having a reflective display function of displaying an image by selectively reflecting light from the display surface side, such as external light or auxiliary light, in addition to the transmissive display function. Furthermore, the display panel 12 may be a semi-transmissive type having both a transmissive display function and a reflective display function.
The display panel 12 may have a configuration corresponding to a horizontal electric field mode, which mainly utilizes a horizontal electric field that is approximately parallel to the main surface of the substrate, or a configuration corresponding to a vertical electric field mode, which mainly utilizes a vertical electric field that is approximately perpendicular to the main surface of the substrate.

FIG. 2 is a plan view of a display panel that shows a schematic example of an electrode structure of the touch sensor 16. As shown in FIG. 2, the touch sensor 16 includes a plurality of, for example, 33, first detection electrodes Tx1 to Txn provided on the first substrate SUB1, and a plurality of, for example, 63, second detection electrodes Rx1 to Rxn provided on the upper surface (surface opposite to the first substrate SUB1) of the second substrate SUB2, which is an insulating layer. To avoid complicating the drawing, FIG. 2 shows a schematic diagram with a reduced number of electrodes. The first detection electrodes Tx1 to Txn are formed in a stripe shape and extend along the longitudinal direction (first direction X) of the first substrate SUB1. The first detection electrodes Tx1 to Txn are also arranged parallel to each other at a predetermined interval in the width direction (second direction Y) perpendicular to the longitudinal direction. The first detection electrodes Tx1 to Txn are provided facing almost the entire surface of the display area (touch detection area) DA. In this embodiment, the first detection electrodes Tx1 to Txn also serve as the common electrode CE of the display panel 12. The first detection electrodes Tx1 to Txn (common electrode CE) are formed of a transparent conductive material such as indium tin oxide (ITO) or indium zinc oxide (IZO).

The second detection electrodes Rx1 to Rxn are formed in stripes and extend in the width direction (second direction Y) of the second substrate SUB2, i.e., in a direction perpendicular to or intersecting the extension direction of the first detection electrodes Tx1 to Txn. The second detection electrodes Rx1 to Rxn are arranged parallel to one another at a predetermined interval in the longitudinal direction of the second substrate SUB2. The second detection electrodes Rx1 to Rxn are provided facing each other over almost the entire display area DA. As a result, the second detection electrodes Rx1 to Rx are arranged in the display area DA so as to intersect with the first detection electrodes Tx1 to Txn, and are further arranged overlapping the first detection electrodes Tx1 to Txn with the second substrate SUB2 in between.
The second detection electrode Rx is formed of a conductive transparent material. Such a conductive transparent material is, for example, an oxide material such as ITO or IZO. The oxide material preferably contains at least one of indium, tin, zinc, gallium, and titanium. The conductive transparent material is not particularly limited to an oxide material, and may be formed of a conductive organic material, a dispersion of fine conductive material, or the like. In addition, the second detection electrode Rx is not limited to the above-mentioned transparent material, and may be formed of a conductive film including a metal layer or an alloy layer made of one or more metals selected from the group consisting of aluminum (Al), copper (Cu), silver (Ag), molybdenum (Mo), chromium (Cr), and tungsten (W). This conductive film is made invisible by blackening or mesh processing.
The first detection electrodes Tx may be provided so as to extend not only in the first direction X but also in the second direction Y. In this case, the second detection electrodes Rx are provided so as to extend in the first direction X.

The touch sensor 16 has a plurality of first control wirings CL1 connected to the first detection electrodes Tx1 to Txn, respectively, and a plurality of second control wirings CL2 connected to the second detection electrodes Rx1 to Rxn, respectively. The first control wirings CL1 are control wirings for electrically connecting each of the first detection electrodes Tx to the shift register SR or the driving IC chip 14. In this embodiment, the plurality of first control wirings CL1 extend from one end in the longitudinal direction of the first detection electrodes Tx1 to Txn, for example, one end on the driving IC chip 14 side, and extend to the driving IC chip 14 through the non-display area ED of the display panel 12. The first control wirings CL1 will be described in detail later.

The second control wiring CL2 (a, b) is a control wiring for electrically connecting each second detection electrode Rx and the touch control IC 18. The second control wiring CL2 extends from one end of the second detection electrodes Rx1 to Rxn in the longitudinal direction, passes through the non-display area ED of the display panel 12, and is connected to the second FPC 22. In this embodiment, for the second detection electrodes Rx1, Rx3, to Rxn in the odd-numbered columns, the second control wiring CL2a extends from the lower end of the second detection electrode Rx in FIG. 2, passes through the non-display area ED on the lower edge side, and extends to the second FPC 22. For the second detection electrodes Rx2, Rx4, to Rxn-1 in the even-numbered columns, the second control wiring CL2b extends from the upper end of the second detection electrode Rx in FIG. 2, passes through the non-display area ED on the upper edge side, and further passes through the non-display area ED on the short side, and extends to the second FPC 22.
According to this embodiment, the second FPC 22 is shifted to one end on the short side of the second substrate SUB2, that is, is joined near the lower end in Fig. 2. Therefore, the second control wiring CL2b connected to the second detection electrodes Rx2, Rx4 to Rxn-a in the even-numbered columns extends across almost the entire width at the end of the short side of the second substrate SUB2.

FIG. 3 is a block diagram that illustrates an example of a drive circuit for the touch sensor 16, and FIG. 4 is a timing chart that illustrates drive timing of the touch sensor.
3, the touch sensor 16 includes a Tx drive circuit 30 that is provided on a first substrate SUB1 and sequentially drives a plurality of first detection electrodes Tx1 to Txn. The Tx drive circuit 30 includes a Tx scanner 32 including a plurality of shift registers SR1, SR2, SR3, etc., a plurality of AND gates N1, N2, N3 that output selection signals, and a switch SW including switching elements SW1, SW2, SW3.

The switching element SW1 is provided between the first detection electrode Tx and the TPH line, and opens and closes in response to the select signal TPHSEL from the AND gate N1 to apply a high-level detection drive signal TPH to the first detection electrode Tx. The switching element SW2 is provided between the first detection electrode Tx and the TPL line, and opens and closes in response to the select signal TPLSEL from the AND gate N2 to apply a low-level detection drive signal TPL to the first detection electrode Tx. The switching element SW3 is provided between the first detection electrode Tx and the Vcom power line, and opens and closes in response to the select signal VcomSEL from the AND gate N3 to apply the Vcom voltage to the first detection electrode Tx.

The Tx scanner 32 sequentially drives a plurality of shift registers SR1, SR2, SR3, etc. in response to a scanner control signal from the drive IC chip 14. The output signals of the shift registers SR1, SR2, SR3, etc. are input to one input terminal of each of the AND gates N1, N2, N3. A signal VcomSEL from the drive IC chip 14 is input to the other input terminal of each of the AND gates N1, N2, N3.
The drive IC chip 14 inputs a vertical synchronization signal and a horizontal synchronization signal to a touch control IC 18 for touch detection, and the touch control IC 18 inputs a drive signal for the first detection electrodes Tx in response to the input synchronization signal to the drive IC chip 14. In addition, a detection signal detected by the second detection electrodes Rx is sent to the touch control IC 18 for touch detection via a second control wiring CL2.

As shown in Fig. 4, the driving IC chip 14 executes a display period A and a touch detection period B alternately and repeatedly multiple times in one horizontal period in response to a horizontal synchronization signal. In each display period A, the Tx driving circuit 30 switches the switching element SW3 on and the switching elements SW2 and SW3 off, and applies a Vcom voltage to the first detection electrode (common electrode) Tx. In addition, in the display period A, the driving IC chip 14 supplies a switching signal and a video signal SigX to the gate lines and video signal lines of the display area DA through control wiring described later.

In the touch detection period B, the drive IC chip 14 sequentially switches the shift registers SR1, SR2, ... in response to the Tx drive signal from the touch control IC 18, and alternately switches the switching elements SW1 and SW2 on and off. As a result, in the touch detection period B, a high-level (in-phase) detection drive signal TPH and a low-level (opposite-phase) detection drive signal TPL are alternately applied to the first detection electrodes Tx. In the touch detection period B, when a finger approaches or touches the display surface (detection area) of the display panel 12, a capacitance is added to the second detection electrodes Rx with the touch position as the center, and the capacitance between the first detection electrodes TX and the second detection electrodes RX changes. A detection signal including this capacitance change is sent from the second detection electrodes Rx to the touch control IC 18. The touch control IC 18 detects the touch and the touch coordinate position based on the received detection signal.

FIG. 5 is a plan view that illustrates a schematic arrangement of the first control wiring CL1 and the second control wiring CL2 between the switch SW and the Tx scanner (shift register SR) 32 in the Tx drive circuit 30. As illustrated in FIG.
5, in this embodiment, each switch SW of the Tx drive circuit 30 is provided adjacent to one longitudinal end (the end on the drive IC chip 14 side) of the first detection electrodes Tx1 to Txn, and is directly connected to the end of the first detection electrodes Tx1 to Txn. The second control wirings CL2b connected to the second detection electrodes Rx2 to Rxn-1 in the even-numbered columns are provided between the switch SW and the Tx scanner (shift register SR) 32 in the non-display area ED on the short side of the second substrate SUB2, and extend substantially parallel to the short side of the second substrate SUB2.

The first control lines CL1 that send control signals to the switches SW extend from the shift registers SR1 to SRn to the corresponding switches SW. In this embodiment, each of the first control lines CL1 is bent in a step-like manner, for example. That is, each of the first control lines CL1 extends from the shift register SR in a direction perpendicular to the second control line CL2b, then bends at a right angle, extends parallel to the second control line CL2b, bends at a right angle again, and extends to the switch SW in a direction perpendicular to the second control line CL2. As a result, a portion of the first control line CL1 is positioned so as to overlap with the second control line so as to be perpendicular to the second control line, and a portion of the first control line CL1 extends so as to overlap with the second control line CL2b in parallel to the second control line CL2b. In this way, most of the first control wirings CL1 extend at an angle other than parallel to the second control wirings CL2b in plan view, and in this embodiment, they extend at a substantially right angle to the second control wirings CL2b, with only a portion extending substantially parallel to the second control wirings CL2b. As a result, the first control wirings CL1 are positioned to partially overlap the second control wirings CL2b in plan view, and are not overlapped in parallel over their entire length. Furthermore, as will be described later, the width W1 of the first control wirings CL1 is very small compared to the width W2 of the second control wirings CL2b, and therefore the overlapping area can be made small even in the region where the first control wirings CL1 and the second control wirings CL2 overlap.
In FIG. 5, in order to avoid complicating the drawing, the other multiple first detection electrodes Tx, the switch SW, and the first control line CL1 located in the center are omitted.

6A is a cross-sectional view of the display panel taken along line B-B in FIG. 5. As shown in FIG. 5 and FIG. 6A, the width W1 of each first control line CL1 is narrower than the width of the first detection electrode Tx and narrower than the width W2 of the second control line CL2. In the embodiment, the width W1 of the first control line CL1 is 1/2 or less, more preferably 1/5 or less, of the width W2 of the second control line CL2. The first control line CL1 only transmits a selection signal from the shift register SR to the switch SW, and therefore can be made of a thin line. In the first control line CL1, the potential of the line from the shift registers SR1 to SRn to the switch SW is, for example, 2.5 to 8 V, and the potential of the line from the switch SW to the first detection electrode Tx is, for example, about 8 V or 10 V.
Each first control line CL1 is composed of a set of three lines: a line R1 (TPHSEL) that sends a selection signal to the switch SW1 (TPH), a line R2 (TPLSEL) that sends a selection signal to the switch SW2 (TPL), and a line R3 (VcomSEL) that sends a selection signal to the switch SW3 (VCOMDC). The combined width of these three lines R1 to R3 corresponds to the width W1 of the first control line CL1. At the overlapping position where the first control line CL1 and the second control line CL2b overlap, all of the three lines R1 to R3 that make up the first control line CL1 are positioned to overlap the common second control line CL2b.

FIG. 6B is a cross-sectional view showing a schematic cross section of the control wiring along line B-B in FIG. 5. In the above-mentioned wiring structure, depending on the intersection portion, the second control wiring CL2 overlaps with the first control wiring CL1, and the second control wiring CL2 does not overlap. For example, in the cross section shown in FIG. 6B, two second control wirings CL2 (Rx4, Rx6) overlap with the first control wiring CL1, and one second control wiring CL2 (Rx2) does not overlap with the first control wiring CL1. In this case, coupling occurs between the two overlapping second control wirings CL2 (Rx4, Rx6) and the two first control wirings CL1. Furthermore, as shown by the two-dot chain arrow in FIG. 6B, coupling may also occur between the non-overlapping second control wiring CL2 (Rx2) and the adjacent first control wiring CL1. In order to prevent such coupling between the non-overlapping second control wiring CL2 (Rx2) and the first control wiring CL1, according to the present embodiment, the three wirings constituting the first control wiring CL1 are arranged so that the wiring R3 (VCOMSEL) at a fixed potential is closest to the non-overlapping second control wiring CL2 (Rx2). The wiring R3 is arranged at the boundary between the area overlapping with the second control wiring CL2b and the area not overlapping. That is, the three wirings R1, R2, and R3 constituting the first control wiring CL1 are arranged in the order of R3, R2, and R1 from the non-overlapping second control wiring CL2 (Rx2) side.
By arranging the first control wiring CL1 in the above-mentioned manner, it is possible to suppress the occurrence of unnecessary coupling, and to more effectively suppress the occurrence of noise in the touch detection area and the deterioration of the touch detection performance. Note that the order of the wirings R2 and R1 may be any.

Figure 7 is a plan view showing a schematic arrangement of signal lines SL provided in the non-display area ED of the first substrate SUB1. As shown in the figure, in this embodiment, the multiple signal lines SL1 extending from the driving IC chip 14 to the source lines S or video signal lines in the display area DA are arranged on the first substrate SUB1 so as to avoid the multiple switches SW1 to SWn. For example, the signal lines SL1 are grouped together in groups of multiple lines and are arranged between two adjacent switches SW.

According to the touch detection device and liquid crystal display device of the present embodiment configured as described above, the first control wiring CL1 connected to the first detection electrodes Tx1 to Txn for touch detection overlaps with the second control wiring CL2b at an angle different from parallel for the most part, and the area overlapping with the second control wiring CL2 in parallel is significantly reduced. At the same time, since the first control wiring CL1 is formed with a narrow width W1 (1/2 or less, preferably 1/5 or less of W2) compared to the width W2 of the second control wiring CL2b, it is possible to significantly reduce the area (overlapping area) of the overlapping portion of the first control wiring CL1 and the second control wiring CL2b. As a result, it is possible to significantly reduce the coupling capacitance formed in the overlapping portion of the first control wiring CL1 and the second control wiring CL2b. Therefore, it is possible to obtain a touch detection device that can suppress the generation of noise and the deterioration of touch detection performance in the touch detection area caused by the coupling capacitance and realize stable touch detection over the entire touch detection area, and a display device including the same.
The number, shape, and material of the first and second detection electrodes are not limited to those in the first embodiment described above, and may be changed as appropriate. The first detection electrodes of the touch detection device are not limited to those provided on the first substrate SUB1 of the display panel 12, but may be configured to be stacked on the display surface of the second substrate SUB2, with the first detection electrodes, an insulating layer, and the second detection electrodes laminated thereon.

Next, a display device and a touch detection device according to various modified examples and other embodiments will be described. In the modified examples and other embodiments described below, the same parts as those in the first embodiment described above will be given the same reference numerals, and detailed descriptions thereof will be simplified or omitted, and the detailed description will focus on the parts that differ from the first embodiment.

(First Modification)
8A is a plan view illustrating a schematic arrangement of first and second control wirings of a display device and a touch detection device according to a first modification. According to the first modification, at least one of the first control wiring CL1 and the second control wiring CL2b extends at an inclination angle with respect to the other control wiring at the overlapping position, i.e., overlaps and crosses obliquely.
8, in the first modified example, the second control wirings CL2b connected to the second detection electrodes Rx2 to Rxn-1 in the even-numbered columns extend in a direction parallel to the short side of the second substrate SUB2 between the switch SW and the Tx scanner (shift register SR) 32 in the non-display area ED on the short side of the second substrate SUB2. Furthermore, a part of the second control wirings CL2, for example, a part in the vicinity of the Tx scanner 32, has a plurality of inclined portions 64 inclined like a sawtooth. The inclined portions 64 are inclined at an angle θ, for example, 30 to 90 degrees, with respect to the direction parallel to the short side of the second substrate SUB2.

The first control wiring CL1 that sends control signals to the switches SW extends from the shift registers SR1 to SRn to the corresponding switches SW. In this modification, each of the first control wirings CL1 is bent in a step shape. That is, each of the first control wirings CL1 extends from the shift register SR in a direction perpendicular to the short side of the second substrate SUB2, then bends at a right angle, extends parallel to the short side of the second substrate SUB2, bends at a right angle again, and extends to the switch SW. A part of the first control wiring CL1 extends intersecting with the inclined portion 64 of the second control wiring CL2b. At this time, since the inclined portion 64 is inclined at an angle θ, the first control wiring CL1 also extends intersecting with or overlapping with the second control wiring CL2 with an inclination angle of θ or 90 degrees. This prevents the first control wiring CL1 from overlapping with the second control wiring CL2b in parallel, and allows the area of the overlapping portion to be significantly reduced. At the same time, the overlapping areas of the multiple overlapping portions between each of the first control wiring CL1 and the multiple second control wirings CL2 become uniform, making it possible to suppress the generation of noise in the touch detection region and the deterioration of touch detection performance.
Furthermore, a ground layer 60 may be formed on the periphery of the second substrate SUB2 outside the second control wiring CL2. This ground layer 60 is provided so as to overlap the shift register SR.

FIG. 8B is a cross-sectional view showing a schematic cross section of the control wiring along line C-C in FIG. 8A. In the above-mentioned wiring structure, depending on the intersection portion, the second control wiring CL2 overlaps with the first control wiring CL1, and the second control wiring CL2 does not overlap. For example, in the cross section shown in FIG. 8B, two second control wirings CL2 (Rx4, Rx6) overlap with the first control wiring CL1, and one second control wiring CL2 (Rx2) does not overlap with the first control wiring CL1. In this case, coupling occurs between the two overlapping second control wirings CL2 (Rx4, Rx6) and the two first control wirings CL1. Furthermore, as shown by the two-dot chain arrow in FIG. 8B, coupling may also occur between the non-overlapping second control wiring CL2 (Rx2) and the adjacent first control wiring CL1. In order to prevent such coupling between the non-overlapping second control wiring CL2 (Rx2) and the first control wiring CL1, according to this modification, the three wirings constituting the first control wiring CL1 are arranged so that the wiring R3 (VCOMSEL) at a fixed potential is closest to the non-overlapping second control wiring CL2 (Rx2). The wiring R3 is arranged at the boundary between the area overlapping with the second control wiring CL2b and the area not overlapping. That is, the three wirings R1, R2, and R3 constituting the first control wiring CL1 are arranged in the order of R3, R2, and R1 from the non-overlapping second control wiring CL2 (Rx2) side.
By arranging the first control wiring CL1 in the above-mentioned manner, it is possible to suppress the occurrence of unnecessary coupling, and to more effectively suppress the occurrence of noise in the touch detection area and the deterioration of the touch detection performance. Note that the order of the wirings R2 and R1 may be any.

(Second Modification)
9A is a plan view illustrating a schematic arrangement of the first and second control wirings of a display device and a touch detection device according to a second modified example. According to the second modified example, at least one of the first control wiring CL1 and the second control wiring CL2b extends at an inclination angle with respect to the other control wiring at the overlapping position, that is, overlaps and extends so as to cross obliquely.
As shown in Figure 9, in the second modified example, a plurality of second control wirings CL2b connected to the second detection electrodes Rx2 to Rxn-1 in the even columns extend in a direction parallel to the short side of the second substrate SUB2 between the switch SW and the Tx scanner (shift register SR) 32 in the non-display area ED on the short side of the second substrate SUB2.

The first control lines CL1 that send control signals to the switches SW extend linearly from the shift registers SR1 to SRn to the corresponding switches SW. Each first control line CL1 is inclined at an angle θ, for example, 30 to 90 degrees, with respect to the direction parallel to the short side of the second substrate SUB2, that is, with respect to the second control line CL2b. A part of each first control line CL1 extends across the second control line CL2b. At this time, the first control line CL1 extends crossing or overlapping with the second control line CL2 with an inclination angle of angle θ. This prevents the first control line CL1 from overlapping in parallel with the second control line CL2b, and makes it possible to significantly reduce the area of the overlapping portion. At the same time, the overlapping areas of the multiple overlapping portions between each first control line CL1 and multiple second control lines CL2 become substantially uniform, and it is possible to suppress the generation of noise in the touch detection area and the deterioration of touch detection performance.

FIG. 9B is a cross-sectional view showing a schematic cross section of the control wiring along line D-D in FIG. 9A. In the above-mentioned wiring structure, depending on the intersection portion, the second control wiring CL2 overlaps with the first control wiring CL1, and the second control wiring CL2 does not overlap. For example, in the cross section shown in FIG. 9B, two second control wirings CL2 (Rx4, Rx6) overlap with the first control wiring CL1, and one second control wiring CL2 (Rx2) does not overlap with the first control wiring CL1. In this case, coupling occurs between the two overlapping second control wirings CL2 (Rx4, Rx6) and the two first control wirings CL1. Furthermore, as shown by the two-dot chain arrow in FIG. 9B, coupling may also occur between the non-overlapping second control wiring CL2 (Rx2) and the adjacent first control wiring CL1. In order to prevent such coupling between the non-overlapping second control wiring CL2 (Rx2) and the first control wiring CL1, according to the present embodiment, among the three wirings constituting the first control wiring CL1, the wiring R3 (VCOMSEL) having a fixed potential is arranged so as to be closest to the non-overlapping second control wiring CL2 (Rx2). The wiring R3 is arranged at the boundary between the area overlapping with the second control wiring CL2b and the area not overlapping. That is, the three wirings R1, R2, and R3 constituting the first control wiring CL1 are arranged in the order of R3, R2, and R1 from the non-overlapping second control wiring CL2 (Rx2) side.
By arranging the first control wiring CL1 in the above-mentioned manner, it is possible to suppress the occurrence of unnecessary coupling, and to more effectively suppress the occurrence of noise in the touch detection area and the deterioration of the touch detection performance. Note that the order of the wirings R2 and R1 may be any.

(Third Modification)
10A is a plan view illustrating a schematic arrangement of first and second control wirings of a display device and a touch detection device according to a third modified example. According to the third modified example, at least one of the first control wiring CL1 and the second control wiring CL2b extends at an inclination angle with respect to the other control wiring at the overlapping position, that is, overlaps and extends so as to cross obliquely.
10A, in the third modified example, the second control wirings CL2b connected to the second detection electrodes Rx2 to Rxn-1 in the even-numbered columns extend in a direction parallel to the short side of the second substrate SUB2 between the switch SW and the Tx scanner (shift register SR) 32 in the non-display area ED on the short side of the second substrate SUB2. Furthermore, at least a part of each second control wiring CL2, in this modified example, the entire second control wiring CL2 is formed to have continuous unevenness such as a wave shape, a sine wave shape, a sawtooth shape, etc. Each part of the second control wiring CL2 is inclined, for example, by 30 to 90 degrees with respect to the direction parallel to the short side of the second substrate SUB2.

Each first control line CL1 is bent in a step shape. That is, each first control line CL1 extends from the Tx scanner 32 in a direction perpendicular to the short side of the second substrate SUB2, then bends at a right angle, extends parallel to the short side of the second substrate SUB2, and then bends at a right angle and extends to the switch SW. A part of the first control line CL1 extends intersecting with the inclined portion 64 of the second control line CL2b. At this time, since each second control line CL2 is formed in a wavy shape, the first control line CL1 extends intersecting with the second control line CL2 at all overlapping portions with an inclination angle of θ or 90 degrees. As a result, the first control line CL1 does not overlap with the second control line CL2b in parallel, and the area of the overlapping portion can be significantly reduced. At the same time, the overlapping areas of the multiple overlapping portions between each first control line CL1 and the multiple second control lines CL2 are substantially uniform, which makes it possible to suppress the generation of noise in the touch detection area and the deterioration of touch detection performance.

FIG. 10B is a cross-sectional view showing a schematic cross section of the control wiring along line E-E in FIG. 10A. In the above-mentioned wiring structure, depending on the intersection portion, the second control wiring CL2 overlaps with the first control wiring CL1, and the second control wiring CL2 does not overlap. For example, in the cross section shown in FIG. 10B, two second control wirings CL2 (Rx4, Rx6) overlap with the first control wiring CL1, and one second control wiring CL2 (Rx2) does not overlap with the first control wiring CL1. In this case, coupling occurs between the two overlapping second control wirings CL2 (Rx4, Rx6) and the two first control wirings CL1. Furthermore, as shown by the two-dot chain arrow in FIG. 10B, coupling may also occur between the non-overlapping second control wiring CL2 (Rx2) and the adjacent first control wiring CL1. In order to prevent such coupling between the non-overlapping second control wiring CL2 (Rx2) and the first control wiring CL1, according to the present embodiment, among the three wirings constituting the first control wiring CL1, the wiring R3 (VCOMSEL) having a fixed potential is arranged so as to be closest to the non-overlapping second control wiring CL2 (Rx2). The wiring R3 is arranged at the boundary between the area overlapping with the second control wiring CL2b and the area not overlapping. That is, the three wirings R1, R2, and R3 constituting the first control wiring CL1 are arranged in the order of R3, R2, and R1 from the non-overlapping second control wiring CL2 (Rx2) side.
By arranging the first control wiring CL1 in the above-mentioned manner, it is possible to suppress the occurrence of unnecessary coupling, and to more effectively suppress the occurrence of noise in the touch detection area and the deterioration of the touch detection performance. Note that the order of the wirings R2 and R1 may be any.

(Fourth Modification)
11A is a plan view illustrating an arrangement structure of the first control wirings and the second control wirings of a display device and a touch detection device according to a fourth modified example. According to the fourth modified example, the second control wirings CL2b connected to the second detection electrodes Rx2 to Rxn-1 in the even-numbered columns extend in a direction parallel to the short side of the second substrate SUB2 between the switch SW and the Tx scanner (shift register SR) 32 in the non-display area ED on the short side of the second substrate SUB2.
The first control lines CL1 that send control signals to the switches SW extend in one direction from the shift registers SR1 to SRn to the corresponding switches SW. Each of the first control lines CL1 is inclined at an angle θ, for example, 30 to 90 degrees, with respect to a direction parallel to the short side of the second substrate SUB2, i.e., with respect to the second control lines CL2b. Furthermore, at least a portion of each of the first control lines CL1, and in this modification, the entirety of each of the first control lines CL1, is formed to have continuous unevenness in the planar direction, such as a wavy, sinusoidal, or sawtooth shape.

A portion of each of the first control lines CL1 extends across the second control line CL2b. At this time, the first control lines CL1 extend crossing or overlapping the second control line CL2 with an inclination angle of θ or 90 degrees. Furthermore, since each of the first control lines CL1 is formed in a wavy shape, most of the overlapping portion crosses the second control line CL2 in a direction substantially perpendicular to the second control line CL2.
This prevents the first control wiring CL1 from overlapping with the second control wiring CL2b in parallel, and further reduces the area of the overlapping portion. At the same time, the overlapping areas of the multiple overlapping portions between each of the first control wiring CL1 and the multiple second control wirings CL2 become substantially uniform, and it is possible to suppress the generation of noise in the touch detection region and the deterioration of touch detection performance.

FIG. 11B is a cross-sectional view showing a schematic cross section of the control wiring along the line F-F in FIG. 11A. In the above-mentioned wiring structure, depending on the intersection portion, the second control wiring CL2 overlaps with the first control wiring CL1, and the second control wiring CL2 does not overlap. For example, in the cross section shown in FIG. 11B, two second control wirings CL2 (Rx4, Rx6) overlap with the first control wiring CL1, and one second control wiring CL2 (Rx2) does not overlap with the first control wiring CL1. In this case, coupling occurs between the two overlapping second control wirings CL2 (Rx4, Rx6) and the two first control wirings CL1. Furthermore, as shown by the two-dot chain arrow in FIG. 11B, coupling may also occur between the non-overlapping second control wiring CL2 (Rx2) and the adjacent first control wiring CL1. In order to prevent such coupling between the non-overlapping second control wiring CL2 (Rx2) and the first control wiring CL1, according to the present embodiment, among the three wirings constituting the first control wiring CL1, the wiring R3 (VCOMSEL) having a fixed potential is arranged so as to be closest to the non-overlapping second control wiring CL2 (Rx2). The wiring R3 is arranged at the boundary between the area overlapping with the second control wiring CL2b and the area not overlapping. That is, the three wirings R1, R2, and R3 constituting the first control wiring CL1 are arranged in the order of R3, R2, and R1 from the non-overlapping second control wiring CL2 (Rx2) side.
By arranging the first control wiring CL1 in the above-mentioned manner, it is possible to suppress the occurrence of unnecessary coupling, and to more effectively suppress the occurrence of noise in the touch detection area and the deterioration of the touch detection performance. Note that the order of the wirings R2 and R1 may be any.

(Fifth Modification)
12 is a plan view showing a schematic arrangement of the first control wiring and the second control wiring of the display device and the touch detection device according to the fifth modification. According to the fifth modification, the switches SW of the Tx drive circuit are provided adjacent to the shift registers SR1 to SRn of the Tx scanner 32, respectively, and are spaced apart from one end of the first detection electrode Tx.
A plurality of second control wirings CL2b connected to the second detection electrodes Rx2 to Rxn-1 in the even columns extend in a direction parallel to the short side of the second substrate SUB2 between one end of the first detection electrode Tx and the switch SW in the non-display area ED on the short side of the second substrate SUB2.

The first control wiring CL1, which transmits a control signal from the switch SW to the first detection electrode Tx, is formed in a stripe shape and extends linearly from the switch SW to one end of the corresponding first detection electrode Tx. According to this modification, the width (wiring thickness) of each first control wiring CL1 is formed to be approximately equal to the width of the first detection electrode Tx, or approximately equal to the width of the second control wiring CL2b. In addition, each first control wiring CL1 is inclined at an angle θ, for example, 30 to 90 degrees, with respect to the direction parallel to the short side of the second substrate SUB2, that is, with respect to the second control wiring CL2b. Each first control wiring CL1 extends across multiple second control wirings CL2b. At this time, the first control wiring CL1 extends crossing or overlapping with the second control wiring CL2 with an inclination angle of angle θ. This prevents the first control line CL1 from overlapping the second control line CL2b in parallel, and makes it possible to significantly reduce the area of the overlapping portion. At the same time, the overlapping area of the multiple overlapping portions between each first control line CL1 and multiple second control lines CL2 becomes uniform, making it possible to suppress the generation of noise in the touch detection area and the deterioration of touch detection performance.

(Sixth Modification)
13 is a plan view that shows a schematic arrangement of the first control wiring and the second control wiring of the display device and the touch detection device according to the sixth modification, and FIG. 14 is a cross-sectional view of the display device taken along line G-G in FIG. 13. According to the sixth modification, the display device further includes two power supply wirings that function as the first control wirings. That is, the display device includes a first power supply wiring P1 (VCOMSEL) and an opposite-phase second power supply wiring P2 (xVCOMSEL) that are provided on the first substrate SUB1. The first power supply wiring P1 and the second power supply wiring P2 extend along the side edge of the second substrate SUB2 outside the Tx scanner 32. The first power supply wiring P1 and the second power supply wiring P2 are connected to each shift register SR of the Tx scanner 32.
The second control wirings CL2b connected to the second detection electrodes Rx2 to Rxn-1 in the even-numbered columns are disposed in the non-display area ED on the short side of the second substrate SUB2 between the switch SW and the Tx scanner (shift register SR) 32, and are arranged substantially parallel to the short side of the second substrate SUB2. The first control wirings CL1 are bent in a step shape. That is, each of the first control wirings CL1 extends from the shift register SR in a direction perpendicular to the short side of the second substrate SUB2, then bends at a right angle, extends parallel to the short side of the second substrate SUB2, and further bends at a right angle to extend to the switch SW. A part of the first control wiring CL1 extends crossing the inclined portion 64 of the second control wiring CL2b.
Furthermore, according to this modification, a mesh-shaped ground layer 60 is formed on the periphery of the second substrate SUB2 outside the second control wiring CL2. This ground layer 60 is provided overlapping the Tx scanner 32 and the first and second power supply wirings P1, P2 on the first substrate SUB1. The ground layer 60 suppresses the occurrence of coupling between the Tx scanner 32, the first and second power supply wirings P1, P2, and the second control wiring CL2.

Second Embodiment
FIG. 15 is a plan view that illustrates a touch detection device of a display device according to a second embodiment, and FIG. 16 is a plan view that illustrates an example of an arrangement structure of control wiring and power supply wiring.
According to the second embodiment, the touch sensor (touch detection device) 16 is configured to input a drive signal from both ends of each first detection electrode Tx in the longitudinal direction. As shown in FIG. 15, the touch sensor 16 includes a plurality of first detection electrodes Tx1 to Txn provided on a first substrate SUB1 and a plurality of second detection electrodes Rx1 to Rxn provided on the upper surface of a second substrate SUB2, which is an insulating layer. The first detection electrodes Tx1 to Txn are formed in a stripe shape and extend along the longitudinal direction (first direction X) of the first substrate SUB1. The first detection electrodes Tx1 to Txn are arranged parallel to each other at a predetermined interval in the width direction (second direction Y) perpendicular to the longitudinal direction. The first detection electrodes Tx1 to Txn are provided to face almost the entire display area (touch detection area) DA.
The second detection electrodes Rx1 to Rxn are formed in stripes and extend in the width direction (second direction Y) of the second substrate SUB2, i.e., in a direction perpendicular to or intersecting the extension direction of the first detection electrodes Tx1 to Txn. The second detection electrodes Rx1 to Rxn are arranged parallel to one another at a predetermined interval in the longitudinal direction of the second substrate SUB2. The second detection electrodes Rx1 to Rxn are provided opposite to almost the entire display area DA. As a result, the second detection electrodes Rx1 to Rx are arranged so as to intersect with the first detection electrodes Tx1 to Txn in the display area DA, and further, the intersecting portions are opposed to the first detection electrodes Tx1 to Txn across the second substrate SUB2.

In the second embodiment, a Tx scanner 32 having a plurality of shift registers SR is provided on one end and the other end of the first substrate SUB1 in the longitudinal direction. Switches SW are provided adjacent to both ends of each first detection electrode Tx in the longitudinal direction and are connected to the first detection electrodes Tx. Each shift register SR of the Tx scanner 32 is connected to a corresponding switch SW by a first control line CL1.
The second control wirings CL2 extend from one end of the second detection electrodes Rx1 to Rxn in the longitudinal direction, pass through the non-display area ED of the display panel 12, and are connected to the second FPC 22. In this embodiment, for the second detection electrodes Rx1, Rx3, to Rxn-1 in the odd-numbered columns, the second control wirings CL2b extend from the upper ends (one end in the Y direction) of the second detection electrodes Rx when the Y direction is the vertical direction in FIG. 15, pass through the non-display area ED on the long side of the second substrate SUB2, and further pass through the non-display area ED on the short side of the second substrate SUB2, and extend to the second FPC 22. For the second detection electrodes Rx2, Rx4, to Rxn in the even columns, the second control wiring CL2a extends from the lower end (the other end in the Y direction) of the second detection electrode Rx, passes through the non-display area ED on the long side of the second substrate SUB2, and extends to the second FPC 22.
The second FPC22 is joined to a position shifted to one end of the short side of the second substrate SUB2, that is, in a position near the bottom end of the short side when the Y direction is the vertical direction in Fig. 15. Therefore, the second control wiring CL2b connected to the odd-numbered second detection electrodes Rx1, Rx3 to Rxn-1 extends over almost the entire length of the short side in the non-display area ED on the short side of the second substrate SUB2.

The first control wiring CL1 and the second control wiring CL2b are arranged in the same manner as in the first embodiment described above, at the short side end portion of the second substrate SUB2 located on the side of the driving IC chip 14. That is, the multiple second control wirings CL2b connected to the odd-numbered second detection electrodes Rx1, Rx3 to Rxn-1 are arranged in a direction substantially parallel to the short side of the second substrate SUB2, between the switch SW and the Tx scanner (shift register SR) 32, in the non-display area ED on the short side of the second substrate SUB2.
The first control wiring CL1 that sends a control signal to the switch SW extends from the shift register SR of the Tx scanner 32 to the corresponding switch SW. Each of the first control wirings CL1 is bent in a step-like shape, for example. That is, each of the first control wirings CL1 extends from the shift register SR in a direction perpendicular to the second control wiring CL2b, then bends at a right angle, extends parallel to the second control wiring CL2b, bends at a right angle again, and extends to the switch SW in a direction perpendicular or intersecting with the second control wiring CL2. As a result, a part of the first control wiring CL1 is positioned so as to overlap with the second control wiring CL2b so as to be perpendicular, and a part of the first control wiring CL1 extends so as to overlap with the second control wiring CL2b in parallel. The width of each of the first control wirings CL1 is narrower than the width of the first detection electrode Tx, and is further narrower than the width W2 of the second control wiring CL2. In this embodiment, the width of the first control line CL1 is set to ½ or less, more preferably ⅕ or less, of the width of the second control line CL2.

According to the second embodiment, a first power supply wiring (VCOMSEL) P1 and a second power supply wiring (xVCOMSEL) P2 are provided in the non-display region, i.e., the peripheral portion, of the first substrate SUB1 and extend around the entire periphery. The first and second power supply wirings P1 and P2 functioning as first control wirings extend along a pair of long sides and a pair of short sides of the first substrate SUB1. The first and second power supply wirings 1 and P2 are electrically connected to a pair of Tx scanners 32 and a driving IC chip 14.
15 and 16, of the first and second power supply wirings P1, P2, the long side wiring portions extending along a pair of long sides of the first substrate SUB1 extend at an angle θ2 (e.g., 5 to 90 degrees) with respect to a direction parallel to the long sides. In this embodiment, the long side wiring portions of the first and second power supply wirings P1, P2 are bent at the center. That is, the long side wiring portions of the first and second power supply wirings P1, P2 extend from one end of the long side of the first substrate SUB1 to approximately the center at an angle θ2 toward the second detection electrode Rx, and then extend from this center to the other end of the long side at an angle θ2 outward. As a result, the long-side wiring portions of the first and second power supply wirings P1, P2 do not extend parallel to the second control wirings CL2a, CL2b, but intersect and overlap at an angle with respect to the second control wirings CL2a, CL2b.

A mesh-shaped ground layer 60 is formed on the periphery of the second substrate SUB2 outside the second control wiring CL2. This ground layer 60 is provided overlapping one of the Tx scanners 32 (for example, the Tx scanner 32 provided on the driver IC chip 14 side) and the first and second power supply wirings P1, P2 on the first substrate SUB1. The ground layer 60 suppresses the occurrence of coupling between the Tx scanner 32, the first and second power supply wirings P1, P2, and the second control wiring CL2.

According to the touch detection device and display device of the present embodiment configured as described above, the first control wiring CL1 connected to the first detection electrodes Tx1 to Txn for touch detection is provided so that a part of it overlaps or crosses the second control wiring CL2b. These overlapping parts overlap with the second control wiring CL2b at an angle different from parallel, and the area of parallel overlap with the second control wiring CL2b is significantly reduced. At the same time, the first control wiring CL1 is formed with a narrow width W1 (1/2 or less, preferably 1/5 or less of W2) compared to the width W2 of the second control wiring CL2b, so that the area of the overlapping part (overlapping area) of the first control wiring CL1 and the second control wiring CL2b can be significantly reduced. This makes it possible to significantly reduce the coupling capacitance formed in the overlapping part of the first control wiring CL1 and the second control wiring CL2b.

In addition, the long side wiring portions of the first and second power supply wirings P1, P2 functioning as control wirings extend crossing or overlapping with the second control wirings CL2a, CL2b at an inclination angle of θ2. This prevents the first and second power supply wirings P1, P2 from overlapping in parallel with the second control wirings CL2a, CL2b, making it possible to significantly reduce the area of the overlapping portions. At the same time, the overlapping areas of the multiple overlapping portions between each power supply wiring and the multiple second control wirings CL2 become uniform, making it possible to suppress the generation of noise in the touch detection area and the deterioration of touch detection performance.
From the above, even in the second embodiment, it is possible to obtain a touch detection device that can suppress the generation of noise and degradation of touch detection performance in the touch detection area caused by coupling capacitance and realize stable touch detection over the entire touch detection area, and a display device including the same.
The number, shape, and material of the first and second detection electrodes are not limited to those of the first embodiment described above, and may be changed as appropriate. The first detection electrodes of the touch detection device are not limited to those provided on the first substrate SUB1 of the display panel 12, and may be configured to be stacked on the display surface of the second substrate SUB2, with the first detection electrodes, an insulating layer, and the second detection electrodes stacked. The wiring structure and stacked structure of the first control wiring CL1 and the second control wiring CL2b are not limited to those of the second embodiment, and any of the first to sixth modified examples described above may be applied.

(Seventh Modification)
17 is a schematic diagram showing a wiring structure according to the seventh modification. In the second embodiment described above, the shape of the end of the second control wiring CL2a, CL2b connected to the second detection electrode Rx is not limited to a rectangular shape, but may be a multi-step shape as shown in FIG. 17. By making it such a step shape, the intersection angle between the end of the second control wiring CL2a, CL2b and the first and second power supply wiring P1, P2 can be made larger and closer to 90 degrees. This makes it possible to reduce the area of the portion where the second control wiring CL2a, CL2b and the first and second power supply wiring P1, P2 overlap, and further reduce the coupling capacitance.

(Eighth Modification)
Fig. 18 is a schematic diagram showing a wiring structure according to the eighth modification. In the second embodiment described above, the first and second power supply wirings P1, P2 are configured to overlap a portion of the second control wirings CL2a, CL2b, but this is not limiting. As shown in Fig. 18, the first and second power supply wirings P1, P2 may be arranged apart from the second control wirings CL2a, CL2b without overlapping with the second control wirings CL2a, CL2b. In this case, the first and second power supply wirings P1, P2 are arranged apart from the second control wirings CL2a, CL2b by a distance d at which no coupling occurs.

Third Embodiment
FIG. 19 is a cross-sectional view of a display device including a touch detection device according to the third embodiment, and FIG. 20 is a plan view that roughly illustrates the touch detection device.
According to the second embodiment, the touch detection device (touch sensor) 16 is configured as an independent touch panel and is provided on the display surface of the display panel 12 .
In detail, the touch detection device 16 has, for example, a first insulating layer IF1 formed of a transparent synthetic resin, a plurality of first detection electrodes TX1 to Txn provided on the first insulating layer IF1, a second insulating layer IF2 formed of a transparent synthetic resin, and a plurality of second detection electrodes Rx1 to Rxn provided on the second insulating layer IF2. The second insulating layer IF2 is laminated on the first detection electrodes Tx1 to Txn and the first insulating layer IF1. As a result, the first detection electrodes Tx1 to Txn face the second detection electrodes Rx1 to Rxn with the second insulating layer IF2 sandwiched therebetween.

The display panel 12 has a first substrate SUB1, a second substrate SUB2 arranged opposite the first substrate SUB1 with a gap therebetween, and a liquid crystal layer LQ arranged between the first and second substrates. The first insulating layer IF1 of the touch detection device 16 is attached to the display surface of the display panel 12 by a transparent adhesive layer AD2. Furthermore, in this embodiment, a transparent cover panel 62 is attached to the touch detection device 16 by a transparent adhesive layer AD1.

20, the first detection electrodes Tx1 to Txn are formed in stripes and are arranged along the longitudinal direction (first direction X) of the first insulating layer IF1. The first detection electrodes Tx1 to Txn are arranged parallel to each other at a predetermined interval in the width direction (second direction Y) perpendicular to the longitudinal direction. The first detection electrodes Tx1 to Txn are provided opposite to almost the entire display area (touch detection area) DA.
The second detection electrodes Rx1 to Rxn are formed in stripes and extend in the width direction (second direction Y) of the second substrate SUB2, i.e., in a direction perpendicular to the extension direction of the first detection electrodes Tx1 to Txn. The second detection electrodes Rx1 to Rxn are arranged parallel to one another at a predetermined interval in the longitudinal direction of the second substrate SUB2. The second detection electrodes Rx1 to Rxn are provided facing each other over almost the entire surface of the display area DA. As a result, the second detection electrodes Rx1 to Rx are arranged in the display area DA so as to intersect with the first detection electrodes Tx1 to Txn, and are further arranged to overlap the first detection electrodes Tx1 to Txn with the second insulating layer IF2 sandwiched therebetween.

A plurality of first control lines CL1 are provided on the non-display area ED of the first insulating layer IF1. The plurality of first control lines CL1 are connected to one longitudinal end of the first detection electrodes Tx1 to Txn, extend from these first detection electrodes in the first direction X, then bend at a right angle, and extend in the second direction Y (along the short side of the first insulating layer IF1). The first control lines CL1 are connected to a driving IC chip (not shown). The other plurality of first control lines CL1 are connected to the other longitudinal ends of the first detection electrodes Tx1 to Txn, extend from these first detection electrodes in the first direction X, then bend at a right angle, and extend in the second direction Y (along the other short side of the first insulating layer IF1). These other first control lines CL1 are connected to a driving IC chip (not shown). A Tx drive signal (TPH, TPL) is supplied from the drive IC chip to the first detection electrodes Tx1 to Txn via the first control wiring CL1.

A plurality of second control lines CL2 are provided on the non-display area ED of the second insulating layer IF2. The plurality of second control lines CL2 extend in the second direction Y from one end of the longitudinal direction of the second detection electrodes Rx1 to Rxn, then bend in the first direction X (to the right in the figure), then bend in the second direction Y, and extend along one short side of the second insulating layer IF2. The other plurality of second control lines CL2 extend in the second direction Y from one end of the longitudinal direction of the second detection electrodes Rx1 to Rxn, then bend in the first direction X (to the left in the figure), then bend in the second direction Y, and extend along the other short side of the second insulating layer IF2. These plurality of second control lines CL2 are connected to a touch driving IC chip for touch detection (not shown). As a result, the detection signal detected by the second detection electrodes Rx1 to Rxn is sent to the touch driving IC chip via the second control lines CL2.

At least one of the first control line CL1 and the second control line CL2b extends at an inclination angle with respect to the other control line at the overlapping position, that is, overlaps and intersects obliquely.
According to this embodiment, at the pair of short side end portions of the first insulating layer IF1, the first control wiring CL1 extends approximately parallel to the short side of the first insulating layer IF1, that is, in the second direction Y. In contrast, at the pair of short side end portions of the second insulating layer IF2, the multiple second control wiring CL2 extend at an angle θ2 (for example, 5 to 90 degrees) with respect to the direction parallel to the short side. In this embodiment, the second control wiring CL2 is bent at the center. That is, the second control wiring CL2 extends from one end of the short side of the second insulating layer IF2 to approximately the center at an angle θ2 toward the second detection electrode Rx with respect to the direction parallel to the short side of the second insulating layer IF2, and extends from the center to the other end of the short side at an angle -θ2 outward with respect to the direction parallel to the short side of the second insulating layer IF2. As a result, at a pair of short side ends of the first and second insulating layers IF1, IF2, the multiple second control wirings CL2 do not extend parallel to the first control wiring CL1, but intersect and overlap at an angle relative to the first control wiring CL1.

According to the touch detection device and display device of the third embodiment configured as described above, at least one of the first control wiring CL1 and the second control wiring CL2b extends at an inclination angle with respect to the other control wiring at the overlapping position, that is, overlapping so as to cross obliquely. This makes it possible to significantly reduce the area of the overlapping portion without the first control wiring CL1 and the second control wiring CL2 overlapping in parallel. At the same time, the overlapping area of the multiple overlapping portions between each first control wiring CL1 and the multiple second control wirings CL2 becomes uniform, and it is possible to suppress the generation of noise in the touch detection area and the deterioration of touch detection performance. From the above, even in the third embodiment, it is possible to obtain a touch detection device that can suppress the generation of noise in the touch detection area and the deterioration of touch detection performance caused by coupling capacitance and realize stable touch detection over the entire touch detection area, and a display device including the same.
The number, shape, and material of the first and second detection electrodes are not limited to those of the first embodiment, and may be changed as appropriate. The wiring structure and stacking structure of the first control wiring CL1 and the second control wiring CL2b are not limited to those of the second embodiment, and any of the first to sixth modified examples may be applied. The display panel is not limited to a liquid crystal display panel, and an organic EL display panel may be applied.

(Ninth Modification)
FIG. 21 is a schematic diagram showing a wiring structure according to the ninth modification. In the second embodiment described above, in the region where the first control wiring CL1 and the second control wiring CL2 overlap, one of the wirings, for example, the second control wiring CL2, is formed to have continuous unevenness such as a wave shape, a sine wave shape, or a sawtooth shape. In this way, by forming each second control wiring CL2, for example, in a wave shape, the second control wiring CL2 extends crossing the first control wiring CL1 at an inclination angle of 30 to 90 degrees at all overlapping portions with the first control wiring CL1. This makes it possible to significantly reduce the area of the overlapping portion without the first control wiring CL1 overlapping the second control wiring CL2b in parallel. At the same time, the overlapping areas of the multiple overlapping portions between each first control wiring CL1 and the multiple second control wirings CL2 become substantially uniform, and it is possible to suppress the generation of noise in the touch detection region and the deterioration of touch detection performance.

Although several embodiments and variations of the present invention have been described, these embodiments and variations are presented as examples and are not intended to limit the scope of the invention. New embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the gist of the invention. The embodiments and variations are included within the scope and gist of the invention, and are included in the scope of the invention and its equivalents described in the claims.

All configurations that can be implemented by a person skilled in the art through appropriate design modifications based on the respective configurations described above as the embodiments and modified examples of the present invention belong to the scope of the present invention as long as they include the gist of the present invention.
Furthermore, other advantageous effects brought about by the above-described embodiments that are obvious from the description in this specification or that can be appropriately thought of by a person skilled in the art are naturally understood to be brought about by the present invention.

10: display device; 12: display panel; 14, 18: driving IC chip;
16: touch sensor (touch detection device), 20: first FPC, 22: second FPC,
30...touch drive circuit, 32...Tx scanner (shift register),
SUB1: array substrate; SUB2: opposing substrate; Tx: first detection electrode;
Rx: second detection electrode; CL1: first control wiring; CL2: second control wiring;
SW: switch; P1: first power supply line; P2: second power supply line

Claims (4)

A display panel including a first substrate having a display area including a plurality of pixels and a non-display area;
a touch detection device provided on the display panel;
The touch detection device includes:
A plurality of first detection electrodes provided to overlap the display area;
a plurality of second detection electrodes provided to overlap the display area and intersect with the first detection electrodes via an insulating layer;
a plurality of first control wirings each connected to the first detection electrodes and provided in the non-display area;
a plurality of second control wirings each connected to the second detection electrodes and provided in the non-display area;
the first control wiring is connected to the first detection electrode via a switch including a plurality of switching elements;
A display device in which the line width of the first control wiring provided in the non-display area is narrower than the width of the first detection electrode and the line width of the second control wiring provided in the non-display area . The display device according to claim 1, wherein the first control wirings and the second control wirings are arranged to overlap at multiple locations in a plan view. A display panel including a first substrate having a display area including a plurality of pixels and a non-display area;
a touch detection device provided on the display panel;
The touch detection device includes:
A plurality of first detection electrodes provided to overlap the display area;
a plurality of second detection electrodes provided to overlap the display area and intersect with the first detection electrodes via an insulating layer;
a plurality of first control wirings each connected to the first detection electrodes and provided in the non-display area;
a plurality of second control wirings each connected to the second detection electrodes and provided in the non-display area;
A display device in which the line width of the first control wiring provided in the non-display area is narrower than the width of the first detection electrode and the line width of the second control wiring provided in the non-display area . 4. The display device according to claim 3, wherein at least a portion of the first control wiring extends parallel to and overlaps with the second control wiring in a planar view, and in the parallel overlapping portion, the line width of the first control wiring is narrower than the line width of the second control wiring.

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