Display device, photoelectric conversion device and electronic device

Abstract

To provide a technique advantageous for high definition while maintaining a high frame rate of a display.SOLUTION: In a display, arranged are 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 voltage according to video data to the plurality of pixels, and at least one second column signal line supplying reference voltage to the plurality of pixels. The plurality of first column signal lines and the at least one second column signal line are arranged along the columns of the plurality of pixels. The at least one second column signal line is connected in common to pixels in at least two columns of the plurality of pixels.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a display device, a photoelectric conversion device, and an electronic device. [Background technology]

[0002] In a display device using an organic electroluminescence (hereinafter referred to as organic EL) film, each pixel is provided with a light-emitting element, 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 voltage that serves as a reference 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. Then, predetermined video data is sequentially written, thereby proposing a display device that achieves high definition while suppressing the occurrence of display defects. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2018-045186 Summary of the Invention [Problem to be solved by the invention]

[0004] In the above example, two video signal lines are arranged between each pixel, which may limit the ability to increase the resolution of the display device. An object of the present invention is to provide a technology that is advantageous for increasing the resolution while maintaining a high frame rate of the display device. [Means for solving the problem]

[0005] 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 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 the reference voltage from the second column signal line to the control electrode of the drive transistor, and the plurality of first column signal lines and the at least one second column signal line are arranged along the columns 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, and the plurality of common signal lines are connected to each other by short-circuit signal lines arranged in parallel to the first column signal lines. It is characterized by being connected. [Effects of the Invention]

[0006] According to the present invention, it is possible to provide a technique that is advantageous for achieving high definition while maintaining a high frame rate of a display device. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is a schematic configuration diagram of a display device according to an embodiment of the present technology. [Figure 2] 3 shows an example of a pixel circuit according to an embodiment. [Figure 3] FIG. 4 is a timing chart illustrating a pixel driving method. [Figure 4] 1 shows an example of the configuration of a display device according to an embodiment. [Figure 5] 1 shows an example of the configuration of a display device according to an embodiment. [Figure 6] 1 shows an example of the configuration of a display device according to an embodiment. [Figure 7] 1 shows an example of the configuration of a display device according to an embodiment. [Figure 8] FIG. 4 is a diagram illustrating pixel drive timing according to an embodiment. [Figure 9]FIG. 2 is a plan view illustrating the arrangement of a display device according to an embodiment. [Figure 10] 10 shows an application example of a display device according to the present disclosure. [Figure 11] (A) An example of an imaging device. (B) An example of an electronic device. [Figure 12] (A) An example of a display device. (B) An example of a foldable display device. [Figure 13] (A) An example of a wearable device. (B) An example of a wearable device having an imaging device. DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. Note that the following embodiments do not limit the scope of the invention claimed. Although multiple features are described in the embodiments, not all of these multiple features are necessarily essential to the invention, and multiple features may be combined arbitrarily. Furthermore, in the accompanying drawings, the same reference numerals are used to designate the same or similar components, and redundant explanations will be omitted.

[0009] 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 among the pixels arranged to form a plurality of rows and a plurality of columns.

[0010] An outline of the pixel circuit and signal lines will be explained using the circuit diagram shown in Fig. 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 a pixel 100.

[0011] Here, pixel 100(i,j) will be described. Pixel 100(i,j) and pixel 100(i,j+1) each have a first selection transistor 103, a pixel circuit 110, and a second selection transistor 104. The signal of the second column signal line 102 is transmitted via a common signal line 116, and the output of the second selection transistor 104 becomes an input signal to each pixel circuit 110.

[0012] A signal voltage (hereinafter referred to as a signal voltage) corresponding to 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 a reference voltage) that serves as a reference for 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 resetting the pixels and for threshold compensation of the drive transistors. In this embodiment, the reference voltage supplied from 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.). Signal pulses for driving the pixels are supplied to the pixels from scanning signal line drive circuit 80 via scanning signal lines 105-108. Note that pixel circuit 110 includes first storage capacitor 121, second storage capacitor 122, light-emitting element 123, drive transistor 124, light-emitting control transistor 125, and reset transistor 126. Note that, although the transistors are described here as having a P-type MOS structure, this is not limitative. N-type MOS structure transistors may also be used, or a combination of these may be used. In such cases, the circuit connection may be changed as appropriate.

[0013] Fig. 3 is a timing diagram illustrating a method for driving the circuit of Fig. 2. Specifically, the voltage VLIN_R of the second column signal line 102 is set to the reference voltage ref by time T1. 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, which is the connection point between one of the first holding capacitors 121 and one of the second holding capacitors 122, and resetting the potential.

[0014] At time T2, ILM1_Tr is controlled to turn on the light-emission control transistor 125, precharging node 1, and at time T3, ILM1_Tr is controlled to turn off the light-emission 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, and at time T7, ILM1_Tr is controlled to turn on the light-emission control transistor 125, causing the light-emitting element 123 to emit light. Thereafter, the next row is displayed in sequence.

[0015] In this embodiment, the reference voltage and the signal voltage can be written using separate column signal lines, compared to the conventional arrangement in which one column signal line is arranged along each pixel column, and therefore writing can be performed at a high frame rate while minimizing the effect of the time constant of the column signal line. In addition, by sharing the second column signal line 102, which writes the reference voltage, among multiple pixels, the spacing between the pixels along the row can be narrowed, making it possible to realize a high-resolution display device.

[0016] FIG. 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 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 the 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 a second selection transistor 204 via a common signal line 216. Note that, assuming that the luminescent intensities of the materials used for the organic EL films of the pixels of different luminescent colors are in the order G pixel > R pixel > B pixel, the pixels are arranged in the pixel unit 115 in the order green (G), blue (B), and red (R). The following embodiments will also be described on the basis of this relationship.

[0017] In FIG. 4 , the second-column signal line 202 is preferably disposed in a green (G) pixel of the base 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 current flowing through the light-emitting element of the G pixel can be reduced compared to the R and B pixels, allowing the light-emitting area to be smaller than that 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 pixels 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 emitting colors depending on the purpose, application, and material used for the organic EL film. According to this embodiment, signals can be written to the pixels at high speed by separating the first-column signal line 101 and the second-column signal line 202. 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.

[0018] 5, an arrangement in which the second selection transistors 404 and the second column signal lines 402 are shared by the pixels 400 of each luminescent color will be described. In Fig. 5, the second selection transistors 404 and the second column signal lines 402 may be arranged in a dummy pixel area or the like that is arranged outside the effective pixel area and includes optical black pixels (OB) that do not emit light and pixels that are not used for luminescent display.

[0019] 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. FIG. 5 shows an example in which columns including 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 in 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 lines 109, and common signal lines 416 may be lower than in the embodiment of FIG. 2. However, the resolution reduction 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 resolution while maintaining a high frame rate. Furthermore, because the common signal lines 416 intersect with the first column signal lines 101 for each luminescent 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, since the increased number of common signal lines 416 can improve the supply of reference voltage, the display is 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 resolution, 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.

[0020] An example in which the second column signal line 602 is arranged on the outermost periphery of an area in which a plurality of pixels 600 are arranged will be described with reference to Fig. 6. In this embodiment, the second column signal line 602 may 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 emitted. In this embodiment, the plurality of pixels 600 arranged along a row intersecting with the first column signal line 101 share the second column signal line 602.

[0021] In this embodiment, dummy pixels are arranged in the outermost portion of a column within a pixel 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 with the first-column signal line 101. In other words, one common signal line 616 is provided for each of the pixels 600 arranged in a row. Therefore, the structure of this embodiment is advantageous for achieving high resolution in directions intersecting with 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 region where 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, which can further enhance the effect of increasing frame rates.

[0022] 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 short-circuited to share a second column signal line. This embodiment is applicable to each of the above-described embodiments. FIG. 7 illustrates a modification of the embodiment shown 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 of the pixel. In the example shown in FIG. 7, in addition to the configuration shown in the embodiment shown in FIG. 6, common signal lines 616 arranged in adjacent rows are connected by a short-circuit signal line 620 that intersects with the common signal line 616, thereby short-circuiting the common signal lines 616. In FIG. 7, the common signal lines 616 arranged in multiple rows are short-circuited by the short-circuit signal line 620. However, placing one short-circuit signal line 620 between pixels in multiple columns is advantageous for achieving high resolution in a direction parallel to the first column signal line.

[0023] The effect of increasing resolution in the direction parallel to the scanning signal lines 105-108, the power supply line 109, and the common signal line 616 can be similar to that of the example shown in FIG. 8 . The short-circuit signal line 620 for shorting the common signal line 616 is disadvantageous in increasing resolution in the direction intersecting the common signal line 616. However, short-circuiting the common signal line 616 is advantageous for reducing the resistance of the reference voltage supply. Therefore, even if the adverse effect of increased coupling capacitance is taken into account, the effect of the time required for the reference voltage to settle can be reduced, thereby enhancing tolerance to fluctuations in the reference voltage. Furthermore, by providing one short-circuit signal line 620 for multiple columns, a decrease in resolution can be suppressed. Incidentally, the time required for the reference voltage to settle can be minimized by simultaneously turning on the second selection transistors 604 provided in multiple rows.

[0024] Although not shown, the first column signal line 101 and the first selection transistor 103 can be shared by pixels of a plurality of luminescent colors, thereby enabling even higher resolution.

[0025] An example of pixel drive timing according to each of the above-described embodiments will be described. In this embodiment, a drive method that can achieve a higher frame rate for each of the above-described embodiments will be described. Here, the configuration example shown in FIG. 4 will be described using FIG. 8, which is a simplified version of the timing diagram shown in FIG. 3. FIG. 8 shows the timing of the reference voltage and signal voltage applied to the pixel 200. In FIG. 8, N1, N2, and N3 respectively represent the drive of pixels 200 arranged in different rows parallel to the first column signal line 101 shown in FIG. 4. Specifically, for example, N1 represents the drive of pixels 200(1,1), 200(1,2), 200(1,3), and 200(1,n). N2 represents the drive of pixels 200(2,1), 200(2,2), 200(2,3), and 200(2,n). N3 represents the drive of pixels 200(3,1), 200(3,2), and 200(3,n).

[0026] In the driving, starting from time T1, a reference voltage is written to pixels 200(1,1), 200(1,2), 200(1,3),..., 200(1,n) in N1, and then a signal voltage is written from time T2. Starting from time T3, a reference voltage is written to pixels 200(2,1), 200(2,2), 200(2,3),..., 200(2,n) in N2, and then a signal voltage is written from time T4. The reference voltage written to pixels 200(2,1),..., 200(2,n) from time T3 is included in the period of the signal voltage written to pixels 200(1,1),..., 200(1,n) from time T2, and the periods overlap. In the example of FIG. 8, by driving in this manner, the time until the reference voltage settles can be included in the period of the signal voltage, thereby significantly shortening the time required for driving. This driving method can achieve a higher frame rate. As the wiring length of the second column signal line 202 increases, it takes time for the signal line 202 to settle, but by overlapping the signal voltage writing period with the signal voltage writing period, the effect of the time required for the signal line 202 to settle can be reduced. Although the configuration of FIG. 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 with the reference voltage writing period.

[0027] An example of a specific wiring layout of a display device will be 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 serves as a reference voltage for the light-emitting element are also arranged. Each 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 the 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.

[0028] Here, a portion of the shield wiring 505 is used as a reference signal line 507 for supplying a reference voltage. Writing a reference voltage to the pixel 200 is performed by using the shield wiring 505 as an input line to the pixel and connecting it to a local reference signal line 506. A reference voltage from a 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 that the width of the second column signal line be 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 wirings required for supplying a reference voltage can be reduced, thereby reducing the layout spacing of the pixels 200 in a planar view.

[0029] Next, a device using the display device of this embodiment will be described with reference to FIG. 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 according to 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 may not 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.

[0030] The display device according to this embodiment may have color filters having red, green, and blue colors. The color filters may be arranged in a delta configuration. The display device according to this embodiment may be used in a display unit of a mobile terminal. In this case, the display device may have both a display function and an operation function. Examples of the mobile terminal include mobile phones such as smartphones, tablets, and head-mounted displays.

[0031] The display device according to this embodiment may be used as a display unit of an imaging device having an optical unit with a plurality of lenses and an imaging element that receives light that has passed through the optical unit. The imaging device may have a display unit that displays information acquired by the imaging element. The display unit may be a display unit exposed to the outside of the imaging device or a display unit disposed within a viewfinder. The imaging device may be a digital camera or a digital video camera.

[0032] 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 captured image but also environmental information, imaging instructions, etc. The environmental information may include the intensity of external light, the direction of external light, the moving speed of the subject, the possibility that the subject will be blocked by an obstruction, etc.

[0033] Since the timing suitable for capturing an image is short, it is better to display information as soon as possible. Therefore, it is preferable to use a light-emitting unit using the organic light-emitting element 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 preferable for devices that require a high display speed.

[0034] 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. Instead of capturing images sequentially, the photoelectric conversion device may include an imaging method that detects the difference from the previous image, or a method of cutting out an image from a constantly recorded image, etc.

[0035] FIG. 11B is a schematic diagram illustrating an example of an electronic device according to this embodiment. The electronic device 1200 includes 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 having a communication unit may also be called a communication device. The electronic device may further include 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.

[0036] 12(A) and 12(B) are schematic diagrams illustrating an example of a display device using the display device 1 of this embodiment. FIG. 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 FIG. 12(A). The bottom side of the frame 1301 may also serve as the base. The frame 1301 and the display unit 1302 may be curved. The radius of curvature may be 5000 mm or more and 6000 mm or less.

[0037] FIG. 12(B) is a schematic diagram illustrating another example of a display device using the display device 1 of the present disclosure. The display device 1310 in FIG. 12(B) is configured to be bendable 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 unit without any 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 display different images, or the first and second display units may display a single image.

[0038] 13, a description will be given of an application example of the display device 1 of each of the above-described embodiments to other devices. The display device 1 can be applied to a system that can be attached as a wearable device, such as smart glasses, an HMD, or a smart contact lens. An image capturing and displaying device used in such an application example includes an image capturing device capable of photoelectrically converting visible light and a displaying device capable of emitting visible light.

[0039] Referring to FIG. 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. Furthermore, the display device 1 according to each of the above-described 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. Furthermore, the control device 1603 controls the operations 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.

[0040] Another example of glasses 1610 (smart glasses) will be described with reference to FIG. 13(B). The glasses 1610 include a control device 1612, which includes an imaging device equivalent to the imaging device 1602 and a display device 1 according to the present disclosure. A lens 1611 includes an 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 for detecting 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 for reducing the incidence of light from the infrared light emitter to the display unit in a planar view can be provided to reduce degradation in image quality.

[0041] The user's line of sight with respect to the displayed image is detected from an image of the eyeball obtained by capturing infrared light. Any method can be applied to gaze detection using an image of the eyeball. As an example, a gaze detection method based on a Purkinje image formed by reflection of irradiated light on the cornea can be used. More specifically, gaze detection processing is performed based on the pupil-corneal reflex method. Using the pupil-corneal reflex method, a 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.

[0042] A display device including the display device 1 of the present disclosure may have an imaging device with a light receiving element and 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 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. 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.

[0043] The display area 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 determined by an external control device and received. 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 an area with a relatively low priority may be lowered.

[0044] Note that AI may be used to determine the first field of view area and areas with high priority. 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 an 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.

[0045] When display control is performed based on visual recognition detection, the smart glasses can be applied to smart glasses that further include an imaging device for capturing images of the outside world. The smart glasses can display captured outside information in real time.

[0046] As described above, by using a device using an organic light-emitting element according to the present disclosure, it is possible to provide a stable display with good image quality even over a long period of time.

[0047] The invention is not limited to the above-described embodiments, and various changes and modifications can be made without departing from the spirit and scope of the invention. Accordingly, the following claims are appended to apprise the public of the scope of the invention. [Explanation of symbols]

[0048] 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

1. 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 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.

2. 2. The display device according to claim 1, wherein the plurality of columns include a first pixel column including a first pixel and a second pixel column including a second pixel, and one of the second column signal lines is connected to the first pixel and the second pixel.

3. 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. 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. 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. 6. The display device according to claim 5, wherein the second column signal line also serves as the shield line.

7. 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. 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.

9. A display device comprising 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 corresponding to video data to the plurality of pixels, and at least one second column signal line supplying 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.

10. 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.

11. A photoelectric conversion device comprising: an optical unit having a plurality of lenses; an imaging element that receives light that has passed through the optical unit; and a display unit that displays an image captured by the imaging element, wherein the display unit comprises a display device according to any one of claims 1 to 10.

12. 11. An electronic device comprising: a display unit having the display device according to claim 1; a housing in which the display unit is provided; and a communication unit provided in the housing for communicating with an external device.

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