JP7807901B2 - Display device, photoelectric conversion device and electronic device - Google Patents

Description

The present invention relates to a display device, a photoelectric conversion device, and an electronic device.

Display devices using organic electroluminescence (hereinafter referred to as organic EL) films have a light-emitting element in each pixel, and images are displayed by individually controlling light emission. In Patent Document 1, a first video signal line that applies a signal voltage corresponding to video data and a second video signal line that applies a reference voltage for the video data are individually arranged along each pixel column. Here, initialization and threshold compensation are performed simultaneously on a first pixel row and an adjacent second pixel row. By then sequentially writing specified video data, a display device is proposed that achieves high definition while suppressing the occurrence of display defects.

Japanese Patent Application Laid-Open No. 2018-045186

In the above example, two video signal lines are placed between each pixel, which can limit the ability of the display device to achieve higher resolution. The object of the present invention is to provide technology that is advantageous for achieving higher resolution while maintaining the display device's high frame rate.

In view of the above problems, a display device of the present invention is a display device including a plurality of pixels arranged to form a plurality of rows and a plurality of columns, a plurality of first column signal lines that supply signal voltages to the plurality of pixels according to video data, and at least one second column signal line that supplies a reference voltage to the plurality of pixels, wherein each of the plurality of pixels comprises a light-emitting element, a drive transistor that drives the light-emitting element, a first selection transistor that supplies the signal voltage from the first column signal line to a control electrode of the drive transistor, and a second selection transistor that supplies the reference voltage from the second column signal line to the control electrode of the drive transistor , the plurality of first column signal lines and the at least one second column signal line are arranged along columns of the plurality of pixels, the at least one second column signal line is commonly connected to pixels of at least two columns of the plurality of pixels via the second selection transistor, the at least one second column signal line is connected to a plurality of common signal lines arranged along the row, and the plurality of common signal lines are connected by short-circuit signal lines that are arranged parallel to the first column signal line .

This invention provides technology that is advantageous for achieving high resolution while maintaining a high frame rate for display devices.

1 is a schematic configuration diagram of a display device according to an embodiment of the present technology. 3 shows an example of a pixel circuit according to an embodiment. FIG. 4 is a timing chart illustrating a pixel driving method. 1 shows an example of the configuration of a display device according to an embodiment. 1 shows an example of the configuration of a display device according to an embodiment. 1 shows an example of the configuration of a display device according to an embodiment. 1 shows an example of the configuration of a display device according to an embodiment. FIG. 4 is a diagram illustrating pixel drive timing according to an embodiment. FIG. 2 is a plan view illustrating the arrangement of a display device according to an embodiment. 10 shows an application example of a display device according to the present disclosure. (A) An example of an imaging device. (B) An example of an electronic device. (A) An example of a display device. (B) An example of a foldable display device. (A) An example of a wearable device. (B) An example of a wearable device having an imaging device.

The following describes the embodiments in detail with reference to the attached drawings. Note that the following embodiments do not limit the scope of the claimed invention. While the embodiments describe multiple features, not all of these features are necessarily essential to the invention, and multiple features may be combined in any desired manner. Furthermore, in the attached drawings, the same reference numbers are used to designate identical or similar components, and redundant explanations will be omitted.

Figure 1 is a schematic diagram of a display device according to the present disclosure. The display device 1 has a scanning signal line driving circuit 80, a column signal line driving circuit 90, and a plurality of pixels 100 each including a light-emitting element. A plurality of scanning signal lines 30 are connected to the scanning line driving circuit 80, and a plurality of column signal lines 20 are connected to the column signal line driving circuit 90. Note that pixel 100(i,j) here represents the pixel located in the ith row and jth column of pixels arranged to form a plurality of rows and a plurality of columns.

The outline of the pixel circuit and signal lines will be explained using the circuit diagram shown in Figure 2. A first column signal line 101 and a second column signal line 102 are connected to a column signal line drive circuit 90. A first scanning signal line 105, a second scanning signal line 106, a third scanning signal line 107, a fourth scanning signal line 108, and a power supply line 109 are connected to a scanning line drive circuit 80. Each line is connected to a transistor in a pixel circuit 110 included in the pixel 100.

Now, pixel 100(i,j) will be described. Pixel 100(i,j) and pixel 100(i,j+1) have a first selection transistor 103, a pixel circuit 110, and a second selection transistor 104. The signal on the second column signal line 102 travels via a common signal line 116, and the output of the second selection transistor 104 becomes the input signal to each pixel circuit 110.

A signal voltage (hereinafter referred to as the signal voltage) corresponding to the video data is supplied to the first column signal lines 101(j) and 101(j+1) from the column signal line drive circuit 90. A voltage (hereinafter referred to as the reference voltage) that serves as a reference for the video data is supplied to the second column signal line 102(j) from the column signal line drive circuit 90. The reference voltage is used for pixel reset operations and drive transistor threshold compensation. In this embodiment, the reference voltage supplied from the second column signal line 102(j) is written in common to pixels arranged in a row (for example, 100(i,j), 100(i,j+1), 100(i,j+2), etc.). The scanning signal line drive circuit 80 supplies signal pulses to the pixels via scanning signal lines 105-108 to drive the pixels. The pixel circuit 110 includes a first storage capacitor 121, a second storage capacitor 122, a light-emitting element 123, a drive transistor 124, a light-emitting control transistor 125, and a reset transistor 126. While the transistors are described here as having a P-type MOS structure, this is not limiting. N-type MOS transistors may also be used, or a combination of these may be used. In this case, the circuit connection may be changed as appropriate.

Figure 3 is a timing diagram illustrating a method for driving the circuit of Figure 2. Specifically, by time T1, the voltage VLIN_R of the second column signal line 102 is set to the reference voltage ref. At time T1, SEL_ref1 is controlled to turn on the second selection transistor 104, and the reference voltage ref is written to the connection point between the control electrode (gate) of the drive transistor 124 and one of the second holding capacitors 122. At the same time, RES1_Tr is controlled to turn on the reset transistor 126, discharging the charge at node 1, where one of the first holding capacitors 121 and one of the second holding capacitors 122 are connected, and resetting the potential.

At time T2, ILM1_Tr is controlled to turn on the light-emitting control transistor 125, precharging node 1. At time T3, ILM1_Tr is controlled to turn off the light-emitting control transistor 125. This causes the terminal voltage of the storage capacitor 122 to change until it settles, thereby maintaining the threshold voltage of the drive transistor 124 relative to the reference voltage. At time T4, the second selection transistor 104 is turned off, and at time T5, SEL_sig1 is controlled to turn on the first selection transistor 103. This causes the signal voltage sig1, which is the voltage VLIN_D of the first column signal line 101, to be written to the gate of the drive transistor 124 and one connection point of the second storage capacitor 122. Thereafter, at time T6, the first selection transistor 103 is turned off to maintain the written signal voltage. At time T7, ILM1_Tr is controlled to turn on the light-emitting control transistor 125, causing the light-emitting element 123 to emit light. Thereafter, the next row is displayed in sequence.

In this embodiment, the reference voltage and signal voltage can be written using separate column signal lines, compared to the conventional method of arranging one column signal line along each pixel column. This minimizes the effect of the time constant of the column signal line, allowing writing at a high frame rate. In addition, by sharing the second column signal line 102, which writes the reference voltage, among multiple pixels, the spacing between pixels along the row can be narrowed, making it possible to realize a high-definition display device.

Figure 4 illustrates an embodiment in which pixels of different luminescent colors are used as units. In this embodiment, the pixels 200 of different luminescent colors are illustrated as an example, using an R pixel that controls red emission, a G pixel that controls green emission, and a B pixel that controls blue emission. In this embodiment, adjacent pixels are arranged so that they emit different luminescent colors. A group of pixels 200 of different luminescent colors constitutes a single unit. This unit is called a pixel unit 115. In this embodiment, multiple pixel units 115 are arranged in a stripe pattern, but this arrangement is not limited to this. In this embodiment, one second column signal line 202 is arranged for each of the three pixels 200 included in the pixel unit 115, and this line is shared by the three pixels 200. A reference signal is written to the three pixels 200 by the second selection transistor 204 via the common signal line 216. Note that the materials used for the organic EL films used in the pixels of different luminescent colors are arranged in the order of green (G), blue (B), and red (R), assuming that the luminescent intensities of the materials are G pixel > R pixel > B pixel. The pixels are arranged in the pixel unit 115 in this order. This relationship will be assumed in subsequent embodiments.

In FIG. 4 , the second-column signal line 202 is preferably disposed in the green (G) pixel of the pixel unit 115. When the pixels 200 are arranged at equal intervals, the pixel in which the second-column signal line 202 is disposed may have a smaller area within the pixel than the pixel in which the second-column signal line 202 is not disposed. Due to the aforementioned premise of the light-emission intensity relationship, the G pixel can pass less current to its light-emitting element than the R and B pixels, allowing the light-emitting area to be smaller than those of the R and B pixels. Therefore, the second-column signal line 202 is disposed in the G pixel. As a result, in this example, even if the pixel circuits included in the pixel 200 are arranged at equal intervals, a decrease in light-emission intensity can be suppressed. However, the arrangement in the G pixel is merely an example, and the second-column signal line 202 can also be disposed in pixels of other light-emitting colors depending on the purpose, application, and material used for the organic EL film. According to this embodiment, separating the first-column signal line 101 and the second-column signal line 202 enables high-speed writing of signals to the pixels. Furthermore, by sharing the second-column signal line 202 across the pixel unit 115, the pixel spacing can be narrowed, thereby reducing the area of the pixel layout. This makes it possible to achieve high definition while maintaining a high frame rate.

Figure 5 illustrates an arrangement in which the second selection transistor 404 and second column signal line 402 are shared by the pixels 400 of each emitting color. In Figure 5, the second selection transistor 404 and second column signal line 402 may be arranged in a dummy pixel area located outside the effective pixel area, including optical black pixels (OB) that do not emit light and pixels not used for emitting light.

In this embodiment, dummy pixels are arranged in the outermost pixels of the display device, and second column signal lines 402 are arranged in the area where the dummy pixels are arranged. Figure 5 shows an example in which columns 400(1,1) to 400(1,3) are arranged as dummy pixels. The second column signal lines 402 can be laid out without affecting the spacing between pixels of each luminescent color within the effective pixel area. Reference voltages are written to pixels of the same luminescent color in each row via common signal lines 416 (here, three per row) provided for each luminescent color. The common signal lines 416 must be arranged in the same number as the number of luminescent colors, intersecting with the first column signal lines 101. Due to the arrangement of the common signal lines 416, the resolution in the direction intersecting the scanning signal lines 105-108, power supply line 109, and common signal line 416 may be lower than in the embodiment shown in Figure 2. However, the reduction in resolution in the direction parallel to the common signal lines 416, i.e., for pixels arranged in rows, can be suppressed. This embodiment also makes it possible to achieve high definition while maintaining a high frame rate. Furthermore, because the common signal lines 416 intersect with the first column signal lines 101 for each emitted color, the coupling capacitance between the signal lines becomes larger than in the above embodiment, potentially reducing the effect of achieving a high frame rate. However, an increase in the number of common signal lines 416 can improve the supply of reference voltage, making the display less susceptible to fluctuations in the reference voltage. Also, in this embodiment, arranging the second column signal lines 402 in the dummy pixel regions of the multiple pixels 400 is advantageous for achieving high definition, but they do not necessarily have to be arranged in the dummy pixel regions. Furthermore, the region in which the second column signal lines 402 are arranged does not have to be the outermost periphery, as long as it is an area that has little effect on the display.

An example in which the second column signal line 602 is arranged at the outermost periphery of an area in which multiple pixels 600 are arranged will be described with reference to Figure 6. In this embodiment, the second column signal line 602 can be arranged in an area in which dummy pixels, including optical black (OB) pixels, are arranged outside the effective pixel area in which light is displayed. In this embodiment, the multiple pixels 600 arranged along a row that intersects with the first column signal line 101 share the second column signal line 602.

In this embodiment, dummy pixels are arranged in the outermost portion of a column within the pixel-arranged region of the display device, and second-column signal lines 602 can be arranged in the dummy pixel region. This allows for a layout without affecting the spacing between pixels of each luminescent color within the effective pixel region. Furthermore, one common signal line 616 is arranged for each pixel 600 arranged in a direction intersecting the first-column signal line 101. In other words, one common signal line 616 is provided for each of multiple pixels 600 arranged in a row. Therefore, the structure of this embodiment is advantageous for achieving high resolution in directions intersecting and parallel to the scanning signal lines 105-108, the power supply line 109, and the common signal line 616. In particular, since the second-column signal line 602 can be arranged in the outermost pixel where the dummy pixels are arranged, it is easy to achieve high frame rates and high resolution. Coupling capacitance is also reduced compared to embodiments in which common signal lines are arranged in the same number as the number of luminescent colors, the effect of achieving a high frame rate can be even greater.

FIG. 7 illustrates an example in which multiple common signal lines 616 arranged along a row of pixels arranged in multiple rows and columns are shorted together to share a second column signal line. This embodiment is applicable to each of the above-mentioned embodiments. FIG. 7 illustrates a modification of the embodiment in FIG. 6. In FIG. 6, the second column signal line 602 is arranged in the first column of pixels 600 arranged in multiple rows and columns, corresponding to the emitting color. In the example in FIG. 7, in addition to the configuration shown in the embodiment in FIG. 6, common signal lines 616 arranged in adjacent rows are connected by a short-circuiting signal line 620 that intersects with the common signal line 616, thereby shorting the common signal lines 616 together. In FIG. 7, the common signal lines 616 arranged in multiple rows are short-circuited together by the short-circuiting signal line 620. However, placing one short-circuiting signal line 620 between pixels in multiple columns is advantageous for achieving high resolution in the direction parallel to the first column signal line.

High-resolution enhancement in the direction parallel to the scanning signal lines 105-108, the power supply line 109, and the common signal line 616 can achieve the same effect as the example in Figure 8. In the direction intersecting the common signal line 616, the placement of the short-circuiting signal line 620 to short-circuit the common signal line 616 is detrimental to high-resolution enhancement. However, short-circuiting the common signal line 616 is advantageous for reducing the resistance of the reference voltage supply, and even taking into account the negative effects of increased coupling capacitance, the impact of the time it takes for the reference voltage to settle can be reduced, thereby strengthening tolerance to fluctuations in the reference voltage. Furthermore, placing one short-circuiting signal line 620 for multiple columns can prevent a decrease in high-resolution enhancement. Incidentally, by simultaneously turning on the second selection transistors 604 provided in multiple rows, it is also possible to minimize the time it takes for the reference voltage to settle.

In addition, although not shown, the first column signal line 101 and first selection transistor 103 can be shared by pixels of multiple emitting colors, enabling even higher resolution.

An example of pixel drive timing for each of the above-described embodiments will be described. In this embodiment, a drive method that can achieve an even higher frame rate for each of the above-described embodiments will be described. Here, the configuration example of FIG. 4 will be described using FIG. 8, which is a simplified version of the timing diagram of FIG. 3. FIG. 8 shows the timing of the reference voltage and signal voltage to the pixel 200. In FIG. 8, N1, N2, and N3 each represent the drive of pixels 200 arranged in different rows parallel to the first column signal line 101 in FIG. 4. Specifically, for example, N1 represents the drive of pixels 200(1,1), 200(1,2), 200(1,3), ... 200(1,n). N2 represents the drive of pixels 200(2,1), 200(2,2), 200(2,3), ... 200(2,n). N3 represents the drive of pixels 200(3,1), 200(3,2), ... 200(3,n).

The driving method begins with writing a reference voltage to pixels 200(1,1), 200(1,2), 200(1,3), ... 200(1,n) in N1 from time T1, followed by writing a signal voltage from time T2. Starting from time T3, the driving method writes a reference voltage to pixels 200(2,1), 200(2,2), 200(2,3), ... 200(2,n) in N2, followed by writing a signal voltage from time T4. The reference voltage written to pixels 200(2,1), ... 200(2,n) from time T3 overlaps with the signal voltage written to pixels 200(1,1), ... 200(1,n) from time T2. In the example shown in Figure 8, this driving method significantly reduces the time required for driving because the time required for the reference voltage to settle can be included within the signal voltage period. This driving method allows for a higher frame rate. As the wiring length of the second column signal line 202 increases, it takes time for it to settle, but by overlapping it with the signal voltage writing period, the impact of the time it takes for it to settle can be reduced. While the configuration in Figure 4 has been used as an example, in other embodiments, a high frame rate can also be achieved by overlapping the signal voltage writing period and the reference voltage writing period.

An example of a specific wiring layout for a display device is described with reference to FIG. 9. FIG. 9 is a plan view of a portion of pixels arranged in a matrix. Here, FIG. 9 will be described using an example of three pixels arranged in a matrix, as in FIG. 4. The element region 501 shown in FIG. 9 is an area where the transistors, storage capacitors, and light-emitting elements included in the pixel 200 are arranged. Wiring for driving the pixel 200 is also arranged. An image signal line 502 corresponding to the first column signal line 101, a reference signal line 507 corresponding to the second column signal line 202, and a local reference signal line 506 corresponding to the common signal line 616 are arranged. A power supply voltage line 503 connected to the power supply line 109 and a reference GND line 504 that provides the reference voltage for the light-emitting element are also arranged. The pixel 200 has storage capacitors 121 and 122. Regarding the storage capacitors 121 and 122, shielding wiring 505 is arranged between pixels arranged along a row in FIG. 9 to reduce interference between pixels 200 due to adjacent storage capacitors. The shielding wiring is not limited to the arrangement shown in FIG. 9. It may be arranged to surround the storage capacitor.

Here, a portion of the shield wiring 505 is used as a reference signal line 507 for supplying a reference voltage. The reference voltage is written to the pixel 200 by using the shield wiring 505 as an input line to the pixel and connecting it to the local reference signal line 506. The reference voltage from the reference signal line 5071 is written to the shield wiring 505 between each pixel via the local reference signal line 506. The reference voltage is supplied to the pixel via the shield wiring 505. The second column signal line 202 may also serve as a shield wiring. When using the second column signal line as a shield wiring, it is preferable to make the width of the second column signal line larger than the width of the first column signal line. A wider width than normal wiring can be expected to provide a greater shielding effect. In this case, the number of additional wiring lines required to supply the reference voltage can be reduced, thereby reducing the layout spacing of the pixels 200 in a planar view.

Next, a device using the display device of this embodiment will be described with reference to Figure 10. The display device 1000 may have a touch panel 1003, a display panel 1005, a frame 1006, a circuit board 1007, and a battery 1008 between an upper cover 1001 and a lower cover 1009. Flexible printed circuits FPCs 1002 and 1004 are connected to the touch panel 1003 and the display panel 1005. Circuit elements such as transistors are mounted on the circuit board 1007. The display device 1 of this embodiment can be applied to the display panel 1005. The display panel 1005 can be driven by transistors mounted on the circuit board 1007. The battery 1008 does not need to be provided if the display device is not a portable device, and even if it is a portable device, it does not need to be provided in this position.

The display device according to this embodiment may have color filters having red, green, and blue colors. The red, green, and blue color filters may be arranged in a delta configuration. The display device according to this embodiment may be used in the display unit of a mobile device. In this case, it may have both display and operation functions. Examples of mobile devices include mobile phones such as smartphones, tablets, and head-mounted displays.

The display device according to this embodiment may be used in the display section of an imaging device that has an optical section with multiple lenses and an imaging element that receives light that has passed through the optical section. The imaging device may have a display section that displays information acquired by the imaging element. The display section may be a display section that is exposed to the outside of the imaging device, or a display section that is located within the viewfinder. The imaging device may be a digital camera or a digital video camera.

Figure 11 (A) is a schematic diagram showing an example of an imaging device according to this embodiment. The imaging device 1100 may have a viewfinder 1101, a rear display 1102, an operation unit 1103, and a housing 1104. The display device 1 according to this embodiment can be applied to the viewfinder 1101. In this case, the display device 1 functions as a display unit and may display not only the image to be captured, but also environmental information, imaging instructions, etc. Environmental information may include the intensity of external light, the direction of external light, the speed at which the subject is moving, the possibility that the subject will be blocked by an obstruction, etc.

Since the optimum timing for capturing an image is very short, it is best to display information as quickly as possible. Therefore, it is advisable to use a light-emitting unit using the organic light-emitting elements according to the embodiment in a display device. This is because organic light-emitting elements generally have a faster response speed than liquid crystal display devices. Display devices using organic light-emitting elements are best used in devices where high display speed is required.

The imaging device 1100 has an optical section (not shown). The optical section may have multiple lenses. The optical section forms an image of a subject on an imaging element housed in a housing 1104. The focus of the multiple lenses can be adjusted by adjusting their relative positions. This operation can also be performed automatically. The imaging device may also be called a photoelectric conversion device. Rather than capturing images sequentially, photoelectric conversion devices can include imaging methods such as detecting the difference from the previous image and cutting out images from images that are constantly being recorded.

Figure 11 (B) is a schematic diagram showing an example of an electronic device according to this embodiment. The electronic device 1200 has a display unit 1201, an operation unit 1202, and a housing 1203. The housing 1203 may include a circuit, a printed circuit board having the circuit, a battery, and a communication unit. The operation unit 1202 may be a button or a touch panel type reaction unit. The operation unit may be a biometric recognition unit that recognizes a fingerprint to unlock the device, etc. An electronic device that has a communication unit can also be called a communication device. The electronic device may further have a camera function by including a lens and an image sensor. An image captured by the camera function is displayed on the display unit. Examples of the electronic device include a smartphone, a laptop computer, etc.

Figures 12(A) and (B) are schematic diagrams showing an example of a display device using the display device 1 of this embodiment. Figure 12(A) may be a display device such as a television monitor or a PC monitor. The display device 1300 has a frame 1301 and a display unit 1302. The display device 1 of this embodiment can be applied to the display unit 1302. The display device 1300 has a base 1303 that supports the frame 1301 and the display unit 1302. The base 1303 is not limited to the form shown in Figure 12(A). The bottom edge of the frame 1301 may also serve as the base. The frame 1301 and the display unit 1302 may also be curved. The radius of curvature may be 5000 mm or more and 6000 mm or less.

Figure 12(B) is a schematic diagram showing another example of a display device using the display device 1 of the present disclosure. The display device 1310 of Figure 12(B) is configured to be foldable and is a so-called foldable display device. The display device 1310 has a first display unit 1311, a second display unit 1312, a housing 1313, and a bending point 1314. The display device 1 according to the embodiment can be applied to the first display unit 1311 and the second display unit 1312. The first display unit 1311 and the second display unit 1312 may be a single display device with no joints. The first display unit 1311 and the second display unit 1312 can be separated by the bending point 1314. The first display unit 1311 and the second display unit 1312 may each display different images, or the first and second display units may display a single image.

With reference to Figure 13, we will explain further examples of applications of the display device 1 of each of the above-mentioned embodiments to equipment. The display device 1 can be applied to systems that can be attached as a wearable device, such as smart glasses, HMDs, and smart contact lenses. An image capturing and displaying device used in such an application example has an image capturing device capable of photoelectrically converting visible light and a displaying device capable of emitting visible light.

With reference to Figure 13 (A), glasses 1600 (smart glasses) will be described as an example. An imaging device 1602 such as a CMOS sensor or SPAD is provided on the front side of a lens 1601 of the glasses 1600. In addition, a display device 1 according to each of the above-mentioned embodiments is provided on the back side of the lens 1601. The glasses 1600 further include a control device 1603. The control device 1603 functions as a power source that supplies power to a display device including the imaging device 1602 and the display device 1 according to each embodiment. The control device 1603 also controls the operation of the imaging device 1602 and the display device 1. An optical system for focusing light on the imaging device 1602 is formed in the lens 1601.

Figure 13 (B) illustrates another example of glasses 1610 (smart glasses). The glasses 1610 include a control device 1612, which is equipped with an imaging device equivalent to the imaging device 1602 and a display device 1 according to the present disclosure. A lens 1611 incorporates the imaging device within the control device 1612 and an optical system for projecting an image from the display device 1, and an image is projected onto the lens 1611. The control device 1612 functions as a power source for supplying power to the imaging device and the display device 1 and controls the operation of the imaging device and the display device 1. The control device may also include a gaze detection unit that detects the wearer's gaze. Infrared light may be used for gaze detection. The infrared light emitter emits infrared light toward the eyeball of a user gazing at a displayed image. An imaging unit with a light-receiving element detects the reflected infrared light from the eyeball, thereby obtaining an image of the eyeball. In this case, a portion that reduces the amount of light incident from the infrared light emitter on the display unit in a planar view can be provided to reduce degradation in image quality.

The user's gaze relative to the displayed image is detected from an image of the eyeball obtained by capturing infrared light. Any method can be used to detect gaze using an image of the eyeball. One example is a gaze detection method based on the Purkinje image, which is created by reflecting irradiated light off the cornea. More specifically, gaze detection processing is performed based on the pupil-corneal reflex method. Using the pupil-corneal reflex method, the gaze vector representing the direction (rotation angle) of the eyeball is calculated based on the image of the pupil and the Purkinje image contained in the image of the eyeball, thereby detecting the user's gaze.

A display device equipped with the display device 1 of the present disclosure may have an imaging device with a light-receiving element, and may control the display image of the display device based on user line-of-sight information from the imaging device. Specifically, the display device determines a first field of view area where the user gazes, and a second field of view area other than the first field of view area, based on the line-of-sight information. The first field of view area and second field of view area may be determined by a control device of the display device, or may be received from an external control device. In the display area of the display device, the display resolution of the first field of view area may be controlled to be higher than the display resolution of the second field of view area. In other words, the resolution of the second field of view area may be lower than that of the first field of view area.

The display area also includes a first display area and a second display area different from the first display area, and a high priority area is determined from the first display area and the second display area based on line-of-sight information. The first field of view area and the second field of view area may be determined by a control device of the display device, or may be received from an external control device. The resolution of the high priority area may be controlled to be higher than the resolution of areas other than the high priority area. In other words, the resolution of areas with relatively low priority may be lowered.

Note that AI may be used to determine the first field of view area and high-priority areas. The AI may be a model configured to estimate the angle of gaze and the distance to an object in the line of sight from the image of the eyeball, using as training data an image of the eyeball and the direction in which the eyeball in the image was actually looking. The AI program may be included in the display device, the imaging device, or an external device. If included in an external device, it is transmitted to the display device via communication.

When display control is based on visual recognition detection, it can be applied to smart glasses that also have an imaging device that captures images of the outside world. The smart glasses can display captured external information in real time.

As explained above, by using a device that uses the organic light-emitting element disclosed herein, it is possible to achieve high-quality images that are stable even over long periods of time.

The invention is not limited to the above-described embodiments, and various modifications and variations are possible without departing from the spirit and scope of the invention. Therefore, the following claims are appended to clarify the scope of the invention.

100: pixel circuit, 101: first column signal line, 102: second column signal line, 103: first selection transistor, 104: second selection transistor, 105: first scanning signal line, 106: second scanning signal line, 107: third scanning signal line, 108: fourth scanning signal line, 109: power supply line, 110: sub-pixel circuit, 116: common signal line, 121: first storage capacitor, 122: second storage capacitor, 123: light-emitting element, 124: drive transistor, 125: light-emitting control transistor, 126: reset transistor

Claims (12)

A display device including a plurality of pixels arranged to form a plurality of rows and a plurality of columns, a plurality of first column signal lines supplying signal voltages according to video data to the plurality of pixels, and at least one second column signal line supplying a reference voltage to the plurality of pixels,
each of the plurality of pixels includes a light-emitting element, a drive transistor that drives the light-emitting element, a first selection transistor that supplies the signal voltage from the first column signal line to a control electrode of the drive transistor, and a second selection transistor that supplies a reference voltage from the second column signal line to the control electrode of the drive transistor;
the plurality of first column signal lines and the at least one second column signal line are arranged along a column of the plurality of pixels;
the at least one second column signal line is commonly connected to pixels in at least two columns of the plurality of pixels via the second selection transistors;
the at least one second column signal line is connected to a plurality of common signal lines arranged along a row;
10. A display device, wherein the plurality of common signal lines are connected to each other by a short-circuit signal line arranged in parallel to the first column signal lines . The display device described in claim 1, characterized in that the multiple columns include a first pixel column including first pixels and a second pixel column including second pixels, and one of the second column signal lines is connected to the first pixels and the second pixels. the plurality of pixels include a plurality of pixels having different luminescent colors,
2. The display device according to claim 1, wherein the second column signal lines are provided corresponding to the luminescent colors, and are each commonly connected to pixels having the same luminescent color via the second selection transistor. 4. The display device according to claim 1 , wherein the plurality of pixels include a dummy pixel region arranged along a column, and the second column signal line is arranged in the dummy pixel region. 5. The display device according to claim 1 , wherein a shielding wiring is arranged between adjacent pixels arranged along a row to shield the pixels from each other. 6. The display device according to claim 5 , wherein the second column signal line also serves as the shield line. 7. The display device according to claim 6 , wherein the width of the second column signal lines is greater than the width of the first column signal lines. 8. The display device according to claim 1, wherein a period during which the first selection transistor of a pixel in a predetermined row supplies the signal voltage from the first column signal line to the control electrode of the drive transistor overlaps with a period during which the second selection transistor of a pixel in a row different from the predetermined row supplies the reference voltage from the second column signal line to the control electrode of the drive transistor. A display device including a plurality of pixels arranged to form a plurality of rows and a plurality of columns, a plurality of first column signal lines that supply signal voltages according to video data to the plurality of pixels, and at least one second column signal line that supplies a reference voltage,
each of the plurality of pixels in the first region includes a light-emitting element, a drive transistor that drives the light-emitting element, a first selection transistor that supplies the signal voltage from the first column signal line to a control electrode of the drive transistor, and a second selection transistor that supplies a reference voltage from the second column signal line to the control electrode of the drive transistor;
the plurality of first column signal lines are arranged along columns of the plurality of pixels in the first region;
Among the plurality of pixels, pixels provided in a second region adjacent to the first region in the row direction are dummy pixels,
the second column signal line extends only in the second region and is commonly connected to pixels in at least two columns of the plurality of pixels via second selection transistors of each pixel. the plurality of pixels in the first region are arranged in units of at least three pixels, and the at least three pixels each exhibit a different luminescent color;
10. The display device according to claim 9, wherein the second column signal line is commonly connected to the at least three pixels included in the unit via the second selection transistor. A photoelectric conversion device comprising an optical unit having a plurality of lenses, an image sensor that receives light that has passed through the optical unit, and a display unit that displays an image captured by the image sensor, wherein the display unit comprises the display device described in any one of claims 1 to 10. An electronic device comprising: a display unit having the display device described in any one of claims 1 to 10; a housing in which the display unit is provided; and a communication unit provided in the housing for communicating with the outside.