Display device, photoelectric conversion device, electronic device, lighting device and mobile device

Abstract

The present invention relates to a display device, a photoelectric conversion device, an electronic device, a lighting device, and a mobile body. The display device includes: a data signal output unit; a first light-emitting element; a first transistor connected to the first light-emitting element and including a gate; a first capacitor including a first node and a second node; a second transistor provided on a first input path through which a signal from the data signal output unit is input to the gate; and a third transistor provided on a second input path different from the first input path through which a signal from the data signal output unit is input to the gate. The first node is connected to the second transistor, the third transistor, and the gate. The second node is configured to be supplied with a power supply potential.

Description

Technical Field

[0001] One aspect of the present invention relates to, for example, a display device, an information display device, a photoelectric conversion device, an electronic device, a lighting device, and a mobile object. Background Art

[0002] As an example of a display device, there is an active matrix type organic electroluminescence (EL) display device that controls a video signal to be supplied to a display element using transistors in pixels.

[0003] Japanese Patent Laid-Open No. 2009-15276 discusses a display device having a pixel structure in which a plurality of signal lines are provided in each column to increase processing speed. Summary of the Invention

[0004] According to a first aspect, a display device includes: a data signal output unit; a first light-emitting element; a first transistor connected to the first light-emitting element and including a gate; a first capacitor element including a first node and a second node; a second transistor arranged on a first input path, and a signal from the data signal output unit is input to the gate via the first input path; and a third transistor arranged on a second input path different from the first input path, and a signal from the data signal output unit is input to the gate via the second input path, wherein the first node is connected to the second transistor, the third transistor and the gate, and wherein the second node is configured to be supplied with a power supply potential.

[0005] According to a second aspect, a display device includes: a plurality of pixels; a plurality of signal lines; and a data signal output unit, wherein each pixel of the plurality of pixels includes: a first light-emitting element; a first transistor connected to one of a source and a drain of the first light-emitting element; a second transistor arranged between one of the plurality of signal lines and a gate of the first transistor; and a third transistor arranged between a signal line different from the one signal line among the plurality of signal lines and the gate of the first transistor.

[0006] According to a third aspect, a display device includes: a first light-emitting element; a data signal output unit configured to output a signal corresponding to the amount of light emitted by the first light-emitting element; a first transistor connected to the first light-emitting element and including a gate; a first capacitor element including a first node and a second node; a first input path, through which a signal from the data signal output unit is input to the gate; and a second input path, through which a signal from the data signal output unit is input to the gate, and the second input path is different from the first input path, wherein a signal corresponding to the first amount of light is supplied to the gate via the first input path, and wherein a signal corresponding to the second amount of light is supplied to the gate via the second input path.

[0007] An information display device includes: an imaging element; and the above-mentioned display device, wherein a display image of the display device is controlled based on information related to a user's line of sight from the imaging element.

[0008] A photoelectric conversion device comprises: an optical unit including a plurality of lenses; an imaging element configured to receive light having passed through the optical unit; and a display unit configured to display an image captured by the imaging element, wherein the display unit comprises the above-mentioned display device.

[0009] An electronic device includes: a display unit including the above-mentioned display device; a housing for equipping the display unit; and a communication unit arranged in the housing and configured to communicate with the outside.

[0010] A lighting device includes: a light source including the above-mentioned display device; and a light diffusion unit or an optical film, through which light emitted from the light source passes.

[0011] A mobile object includes: a lighting tool including the above-mentioned display device; and a main body equipped with the lighting tool.

[0012] Further features of the present invention will become apparent from the following description of embodiments with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is an overall conceptual diagram of a display device according to an embodiment.

[0014] Figure 2 is an example of an equivalent circuit diagram of a portion of a pixel according to an embodiment.

[0015] Figure 3 is a conceptual diagram of an interface of a display device according to an embodiment.

[0016] Figure 4 An example of a driving method of the signal selection circuit according to the embodiment is shown.

[0017] Figure 5 is an example of an equivalent circuit diagram of a portion of a pixel according to an embodiment.

[0018] Figure 6 is an example of an equivalent circuit diagram of a portion of a pixel according to an embodiment.

[0019] Figure 7 An example of a driving method of the signal selection circuit according to the embodiment is shown.

[0020] Figure 8 is an example of an equivalent circuit diagram of a portion of a pixel according to an embodiment.

[0021] Figure 9A 、 9B 9C are schematic structural diagrams of examples of the display device according to the embodiment.

[0022] Figure 10 is a schematic diagram showing an application example of the display device according to the embodiment.

[0023] Figure 11 is a schematic diagram of an example of a display device according to an embodiment.

[0024] Figure 12A and 12B Each is a schematic diagram of an example of an image pickup apparatus and an electronic apparatus according to an embodiment.

[0025] Figure 13A and 13B Each is a schematic diagram of an example of a display device and a foldable display device according to an embodiment.

[0026] Figure 14A is a schematic diagram of an example of a lighting device according to an embodiment. Figure 14B is a schematic diagram of an example of a vehicle including a vehicle lighting tool according to an embodiment.

[0027] Figure 15 This is an example of an equivalent circuit diagram of a portion of a conventional pixel.

[0028] Figure 16 An example of a driving method of a conventional signal selection circuit is shown. DETAILED DESCRIPTION

[0029] Conventional technologies have room for improving image quality. For example, organic electroluminescent (EL) display devices can cause uneven brightness between pixels because the parasitic capacitance of the capacitor element that holds the signal varies from pixel to pixel, column to column, or row to row due to the position of the transistors and wiring within the pixel. The structure discussed in Japanese Patent Application Laid-Open No. 2009-15276 has room for improving uneven brightness between pixels (such as the occurrence of zigzag display unevenness).

[0030] Specific embodiments and application examples of the display device will be described below with reference to the accompanying drawings. In the following description and drawings, common structures across multiple figures are denoted by common reference numerals. Therefore, common structures will be described by cross-referencing multiple figures, and descriptions of structures denoted by common reference numerals will be omitted as appropriate.

[0031] (First embodiment)

[0032] A display device according to a first embodiment will be described with reference to the drawings.

[0033] Figure 1 is an overall schematic diagram of an example of the display device according to the present embodiment. Figure 1 The display device in FIG. 1 includes a pixel region 1, a horizontal drive circuit 2, a vertical drive circuit 3, and a connection terminal unit 4. In the pixel region 1, a plurality of pixels are arranged in a matrix, and a plurality of pixels are arranged for each color. Figure 2 Pixel circuit in. Each pixel includes an organic EL element as a light-emitting element, which emits light of any color of red (R), green (G), and blue (B). The horizontal drive circuit 2 is a circuit for outputting data signals (image signals and reference voltage) and is connected to the output line.

[0034] The matrix arrangement in this specification is not limited to an arrangement in which the light-emitting elements and the driving circuits of the light-emitting elements are arranged in a grid pattern in the direction of rows and columns, and includes an arrangement in which pixels are systematically arranged in a matrix in the entire pixel area. For example, it is assumed that the display device has a structure in which the light-emitting elements of the R pixels are arranged in the Lth column (L is a natural number), the light-emitting elements of the G pixels are arranged in the (L+1)th column, and the light-emitting elements of the B pixels are arranged in the (L+2)th column. In this case, the matrix arrangement includes an arrangement in which the light-emitting elements of the R pixels and the light-emitting elements of the B pixels are aligned in the Mth row, and the light-emitting elements of the G pixels are arranged between the light-emitting elements of the R pixels and the light-emitting elements of the B pixels at a position offset by half a row relative to the light-emitting elements of the R pixels and the B pixels.

[0035] The vertical drive circuit 3 is a circuit for outputting a selection signal. The connection terminal unit 4 is a terminal for inputting signals such as a clock signal and a data signal to the horizontal drive circuit 2 and the vertical drive circuit 3, and is connected to the horizontal drive circuit 2 and the vertical drive circuit 3 through wiring (not shown).

[0036] Will refer to Figure 2 The pixel circuit used in the display device according to this embodiment is described below. Figure 2 In the embodiment, pixel 10 includes: a current-driven light-emitting element 11 whose luminance varies according to the current flowing through the organic EL element; and a drive circuit for driving light-emitting element 11. One electrode of light-emitting element 11 is connected to a common power supply 25, which is commonly connected to all pixels 10 via wiring. Here, an example is described in which the cathode electrode of light-emitting element 11 is connected to the common power supply 25.

[0037] The driving circuit for driving the light emitting element 11 includes a driving transistor 12, selection transistors 13A and 13B, switching transistors 14 and 15, a first capacitance element 16, and a second capacitance element 17. In the example described here, P-channel transistors are used as the driving transistor 12, the selection transistor 13, and the switching transistors 14 and 15.

[0038] In this specification, suffixes are added after reference numerals, such as the suffix of the select transistor 13A when describing a specific select transistor among the multiple select transistors 13A and 13B. If any one or both of the select transistors are mentioned, they are simply referred to as the select transistor 13. The same applies to other components.

[0039] The driving transistor 12 is connected in series to the light-emitting element 11, and thus supplies a driving current to the light-emitting element 11. More specifically, the drain electrode of the driving transistor 12 is connected to the anode electrode of the light-emitting element 11. The amount of light emitted by the light-emitting element 11 is controlled according to the voltage value of the signal input to the gate electrode of the driving transistor 12.

[0040] The selection transistor 13A is connected to the scan line 21A via a gate electrode, to the signal line 24A via a source electrode, and to the gate electrode of the drive transistor 12 via a drain electrode. The selection transistor 13B is connected to the scan line 21B via a gate electrode, to the signal line 24B via a source electrode, and to the gate electrode of the drive transistor 12 via a drain electrode. In other words, a single pixel 10 includes two selection transistors 13, so that there are two input paths through which signals from the horizontal drive circuit 2, which is a data signal output unit, are input to the pixel 10.

[0041] A signal written from the vertical drive circuit 3 via the scan line 21A is applied to the gate electrode of the selection transistor 13A. A signal written from the vertical drive circuit 3 via the scan line 21B is applied to the gate electrode of the selection transistor 13B. The signals written via the scan lines 21A and 21B control the on and off states of the selection transistors 13A and 13B, respectively.

[0042] When the selection transistor 13A is turned on, the input path between the signal line 24A and the gate electrode of the drive transistor 12 becomes conductive. When the selection transistor 13A is turned off, the input path between the signal line 24A and the gate electrode of the drive transistor 12 is electrically interrupted. The same applies to the signal line 24B and the selection transistor 13B.

[0043] The display device according to this embodiment includes a horizontal driving circuit 2 as a data signal output unit, a light emitting element 11, and a first input path and a second input path through which a signal from the data signal output unit is input to the light emitting element 11. The second input path is different from the first input path. For example, Figure 2 , with respect to the light emitting element included in the pixel of the Lth column and the Mth row, the first input path includes the signal line 24A and the selection transistor 13A, and the second input path includes the signal line 24B and the selection transistor 13B.

[0044] The switching transistor 14 is connected to the scanning line 22 via a gate electrode, to the first power supply potential VDD via a source electrode, and to the source electrode of the driving transistor 12 via a drain electrode. A signal for controlling light emission from the vertical driving circuit 3 via the scanning line 22 is applied to the gate electrode of the switching transistor 14.

[0045] The switching transistor 15 is connected to the scanning line 23 via a gate electrode, to the second power supply potential VSS via a source electrode, and to the anode electrode of the light-emitting element 11 via a drain electrode. A signal for controlling the potential of the anode electrode of the light-emitting element is applied to the gate electrode of the switching transistor 15 from the vertical drive circuit 3 via the scanning line 23.

[0046] The first capacitor 16 is connected between the gate electrode and the source electrode of the driving transistor 12. The second capacitor 17 is connected between the source electrode of the driving transistor 12 and the first power supply potential VDD.

[0047] The vertical drive circuit 3 connected to the scanning lines 21A, 21B, 22 and 23 sequentially supplies signals row by row to cause the holding capacitor element in each pixel to hold the signal voltage and the reference voltage and control the pixel to emit light at a brightness corresponding to the signal voltage.

[0048] The pixel circuits in the M-th row and the (M + 1)-th row have the same circuit structure, and the pixel circuits in the L-th column and the (L + 1)-th column have the same circuit structure.

[0049] In the pixel 10 including the above structure, the selection transistors 13A and 13B enter the on state in response to the write signal applied to the gate electrode from the vertical drive circuit 3 through the scan lines 21A and 21B. Through this operation, the signal voltage corresponding to the luminance information or the reference voltage is sampled and written into the pixel 10. By applying the reference voltage, the threshold voltage variation of the drive transistor 12 in each pixel is corrected, so that the luminance variation in each pixel due to the threshold voltage variation can be reduced. The written signal voltage or the written reference voltage is applied to the gate electrode of the drive transistor 12 and is also held by the first capacitor element 16.

[0050] The drive transistor 12 is designed to operate in the saturation region. The drive transistor 12 receives the supply of current from the first power supply potential VDD via the switching transistor 14 and causes the light-emitting element 11 to emit light by current driving. At this time, the amount of current flowing through the light-emitting element 11 is determined according to the voltage held by the first capacitor element 16, so that the light emission amount of the light-emitting element 11 can be controlled. A signal for controlling light emission is applied from the vertical drive circuit 3 to the gate electrode of the switching transistor 14 through the scan line 22, so that the switching transistor 14 enters the on state. In other words, the switching transistor 14 has the function of controlling the light emission and non-light emission of the light-emitting element 11.

[0051] A signal for controlling the potential of the anode electrode of the light-emitting element 11 is applied from the vertical drive circuit 3 to the gate electrode of the switching transistor 15 through the scan line 23, so that the switching transistor 15 selectively supplies the second power supply potential VSS to the anode electrode. If the potential of the common power supply 25 connected to the cathode electrode of the light-emitting element 11 is represented as the cathode potential Vcath and the threshold voltage of the light-emitting element 11 is represented as the threshold voltage Vthel, the second power supply potential VSS is designed to satisfy the condition VSS < Vcath + Vthel. Therefore, in the case where the switching transistor 15 is in the on state, the light-emitting element 11 can be controlled to be in the non-light-emitting state by applying a reverse bias voltage.

[0052] In Figure 2 P-channel metal oxide semiconductor (PMOS) transistors are used as MOS transistors, but N-channel MOS (NMOS) transistors can also be used. Figure 2 The circuit structure including five transistors and two capacitor elements 5Tr2C, which is shown as the drive circuit of the light-emitting element 11, is shown, but the drive circuit is not limited to this circuit structure. For MOS transistors, transistors formed on a silicon wafer or thin film transistors formed on a glass substrate can be used.

[0053] Will refer to Figure 3 The structure of the interface for transmitting data signals to the signal lines 24 is described below. A signal selection circuit 31 is arranged between the horizontal drive circuit 2 and the signal lines 24 in the display device. The signal selection circuit 31 is capable of selectively outputting data signals 32 to the signal lines 24 connected to the output terminals, and is provided with a switch circuit for each output terminal. If the number of signal lines 24 output from one signal selection circuit 31 is represented as M, and the number of signal selection circuits 31 is represented as N, the total number of signal lines 24 is represented as M*N.

[0054] Figure 3 An example of a structure in which six signal lines 24 can be output from one signal selection circuit 31 is shown, so that one signal selection circuit 31 is provided with six switch circuits. In this case, six signal voltage write operations are performed using the switch circuits during one horizontal scanning period. The signal lines 24A and 24B can be connected to the same signal selection circuit 31 or to different signal selection circuits 31.

[0055] The signal line 24 has wiring capacitance and therefore enters a floating state and holds a signal voltage during a period when the switch circuit provided in the signal selection circuit 31 is not performing a writing operation. The signal line 24 can hold the supplied signal voltage until the selection transistors 13 for each selected row are simultaneously turned on and the signal voltage is written to the pixel circuit.

[0056] Since a plurality of signal lines 24 are provided in one column, different signals can be supplied simultaneously in units of a plurality of rows. Therefore, the writing time of each pixel in one frame can be shortened, and the frame rate for displaying an image can be increased.

[0057] Even when multiple signal lines are not connected to the same signal selection circuit 31, the writing time for each pixel in a frame can be shortened, and the frame rate can be increased. The reason is as follows. When a column is provided with a single signal line, after a signal is supplied to that signal line, the signal for the next row cannot be supplied to that column until the potential of the signal line stabilizes. On the other hand, since a column is provided with multiple signal lines, while the potential of the signal supplied by one signal line stabilizes, signals can be supplied from another signal line to pixels in other rows of the same column.

[0058] Will refer to Figure 4 To illustrate the use of this embodiment Figure 2 A driving method for a pixel circuit in FIG.

[0059] In the Nth frame time period, in order to perform threshold correction on the driving transistor in each pixel, when the reference voltage (Vref) is supplied as the data signal 32, the switching circuits of each output terminal in the signal selection circuit 31 enter the conductive state at the same timing.

[0060] After the reference voltage Vref is simultaneously written to the signal lines 24A and 24B, the selection transistor 13A of the Mth row is turned on while the selection transistor 13B of the Mth row is kept off, so that the reference voltage is sampled and written to the pixels of the Mth row.

[0061] Similarly, while the selection transistor 13A of the (M+1)th row is kept in the off state, the selection transistor 13B of the (M+1)th row is turned on, so that the reference voltage is sampled and written into the pixels of the (M+1)th row. In other words, the reference voltage supplied from the signal line 24A is written into the pixels of the Mth row, and the reference voltage supplied from the signal line 24B is written into the pixels of the (M+1)th row.

[0062] Subsequently, while the signal voltage (Vsig) (image signal) is supplied as the data signal 32, the switch circuits in the corresponding signal selection circuits 31 are sequentially turned on, and the signal voltage Vsig is written into the signal lines 24A and 24B. Subsequently, at a certain moment, the selection transistor 13A of the Mth row is turned on while the selection transistor 13B of the Mth row is kept off, and the signal voltage is written into the pixels of the Mth row. Next, the selection transistor 13B of the (M+1)th row is turned on while the selection transistor 13A of the (M+1)th row is kept off, and the signal voltage is written into the pixels of the (M+1)th row.

[0063] In other words, for the pixels in the Mth row, in a state where the input path including the signal line 24B and the selection transistor 13B is electrically interrupted, the signal voltage from the data signal output unit is written into the pixel via the input path including the signal line 24A and the selection transistor 13A. For the pixels in the (M+1)th row, in a state where the input path including the signal line 24A and the selection transistor 13A is electrically interrupted, the signal voltage from the data signal output unit is written into the pixel via the input path including the signal line 24B and the selection transistor 13B.

[0064] These operations are performed simultaneously in the Mth row and the (M+1)th row in one horizontal scanning period, and the same circuit operations are repeated simultaneously in two rows in the horizontal scanning period of the (M+2)th row and subsequent rows.

[0065] When the selection transistor 13A is turned on and a signal voltage is written to the pixel, the signal line 24A is in a floating state. Similarly, when the selection transistor 13B is turned on and a signal voltage is written to the pixel, the signal line 24B is in a floating state.

[0066] In the (N+1)th frame period, the reference voltage and the signal voltage are written into the pixels via a path different from that in the Nth frame period. In other words, the reference voltage supplied from the signal line 24B is written into the pixels in the Mth row, and the reference voltage supplied from the signal line 24A is written into the pixels in the (M+1)th row.

[0067] For the pixels in the Mth row, while the input path including the signal line 24A and the selection transistor 13A is electrically interrupted, the signal voltage from the data signal output unit is written into the pixel via the input path including the signal line 24B and the selection transistor 13B. For the pixels in the (M+1)th row, while the input path including the signal line 24B and the selection transistor 13B is electrically interrupted, the signal voltage from the data signal output unit is written into the pixel via the input path including the signal line 24A and the selection transistor 13A. In the (N+2)th frame period, the reference voltage and the signal voltage are written into the pixel via the same path as in the Nth frame period.

[0068] According to the present embodiment, the input path through which the signal from the data signal output unit is written into the pixel is different for each frame period.

[0069] The input path changes for each frame period, averaging the brightness differences between pixels due to differences in parasitic capacitance of the capacitor elements over multiple frames. This averages the brightness differences over time, reducing or preventing display unevenness across the entire display panel. Furthermore, even when parasitic capacitance varies for each signal line, the brightness differences between pixels are averaged over multiple frames.

[0070] In this specification, a frame period refers to a period from when the initialization voltage Vref is written to a certain signal line of a certain pixel in an arbitrary row to when the initialization voltage Vref is next written to the certain pixel in the row.

[0071] If data signals are written for each row or for each plurality of rows, then, for pixels in any column, after the last write in the direction in which the write is performed, the next write cannot be performed on the pixels in the same row. In this case, the frame period is the period from timing A when the initialization voltage Vref is written to the pixels in any column to timing B. Timing B is the timing at which the initialization voltage Vref is written to the pixels in another row, after and closest to the timing at which the initialization voltage Vref is next written to the pixels, when writing is performed sequentially on pixels in all rows.

[0072] Next, refer to Figure 15 A conventional example of a pixel circuit is described below. The conventional example differs from the pixel circuit according to this embodiment in that the pixel circuit includes a single selection transistor 13 for a single light-emitting element 11 and therefore includes one input path through which a signal from a data signal output unit is input to the light-emitting element 11.

[0073] exist Figure 15 , the signal line 24A is connected to the selection transistor 13 in the pixel circuit of the M-th row (M is an odd number), and the signal line 24B is connected to the selection transistor 13 in the pixel circuit of the (M+1)-th row. In other words, the signal voltage from the signal line 24A is supplied to the pixels of the odd-numbered rows, and the signal voltage from the signal line 24B is supplied to the pixels of the even-numbered rows.

[0074] Figure 16 Show use Figure 15 This is a conventional example of a method for driving pixel circuits in . To perform threshold correction on the drive transistor in each pixel, the switch circuits at the output terminals of the signal selection circuit 31 are turned on at the same timing while a reference voltage (Vref) is supplied as the data signal 32. Therefore, after the reference voltage Vref is simultaneously written to the signal lines 24A and 24B, the selection transistors 13 in the Mth and (M+1)th rows are turned on at the same timing, and the reference voltage is sampled and written to the pixels.

[0075] In other words, the reference voltage supplied from the signal line 24A is written into the pixels in the M-th row, and the reference voltage supplied from the signal line 24B is written into the pixels in the (M+1)-th row.

[0076] Subsequently, in a state where a signal voltage (Vsig) (image signal) is supplied as the data signal 32, the switch circuits in the corresponding signal selection circuits 31 are sequentially turned on, and the signal voltage Vsig is written into the signal lines 24A and 24B. Next, the selection transistors 13 of the Mth and (M+1)th rows are turned on at the same timing, and the signal voltage is written into the pixels.

[0077] In other words, the signal voltage supplied from the signal line 24A is written into the pixels in the Mth row, and the signal voltage supplied from the signal line 24B is written into the pixels in the (M+1)th row. These operations are performed in one horizontal scanning period, and the same circuit operation is repeated in the next and subsequent horizontal scanning periods. The same circuit operation is performed in all frame periods.

[0078] Signal lines 24A and 24B are positioned differently relative to other wiring and transistors, causing the wiring capacitance of signal lines 24A and 24B to differ due to coupling with other wiring and transistors. Therefore, even when the same image signal is applied, there is a possibility of a signal voltage difference between signal lines 24A and 24B. In this case, the difference in brightness is caused by the potential difference between the signal lines. Consequently, there is a possibility of uneven brightness between pixels due to the signal lines to which the image signal is written.

[0079] In contrast, the display device according to this embodiment switches the input path from the data signal output unit to the light-emitting element 11 in a pixel during a first frame period and a second frame period different from the first frame period. Therefore, if a brightness difference occurs between pixels due to a difference in parasitic capacitance of signal lines 24A and 24B, the relationship between the brightness difference between pixels due to the difference in parasitic capacitance is reversed in the first frame period and the second frame period. Therefore, the brightness difference between pixels can be reduced by averaging over time. Therefore, this realizes a display device that reduces the brightness difference between pixels.

[0080] According to this embodiment, the input path of the signal is distinguished between the odd frame period and the even frame period, but this is not restrictive. Any structure including a pixel in which the signal line for supplying the image signal changes for each frame period is applicable. For example, the pixel circuit can be driven so that the signal from the data signal output unit is input to the pixel only in a specific frame period via an input path different from that in other frame periods. The pixel circuit can be driven so that the signal from the data signal output unit is input to the pixel only in a specific row via an input path different for each frame period.

[0081] This embodiment describes an example in which two paths are used by which signals from a data signal output unit are written to pixels (light-emitting elements). However, this embodiment is not limited to this example, and any number of different paths may be used. For example, a structure in which three or more signal lines are provided for each column, and three or more select transistors are provided for each pixel may be employed.

[0082] The above description of “the signal from the data signal output unit is input to the pixel (light-emitting element 11)” includes not only the case where the voltage corresponding to the signal is actually input to the light-emitting element 11, but also the case where the signal is input to the gate of the driving transistor 12 to be applied to the light-emitting element 11.

[0083] This embodiment describes a case where the data signal output unit is a horizontal drive circuit 2 disposed within the display device. However, the data signal output unit is not limited to this configuration. For example, if the horizontal drive circuit 2 is disposed outside the display device and a signal (signal voltage) is supplied via a pad, the data signal output unit may be a pad.

[0084] Since the parasitic capacitance of the first capacitor 16 is changed by changing the layout of the scan line for each selection transistor, this change can be used to reduce the signal voltage difference generated in each pixel. For example, the parasitic capacitance of the first capacitor 16 changes due to the layout position of the scan line of the selection transistor 13. The input path of the signal from the data signal output unit to the pixel can be changed by turning on / off each selection transistor 13, so that the signal voltage to be written to the first capacitor 16 can be changed to reduce the difference in the parasitic capacitance of the first capacitor 16.

[0085] In other words, in addition to the driving method according to the present embodiment, the luminance difference between pixels can be further reduced by reducing the signal voltage difference due to the wiring layout.

[0086] (Second embodiment)

[0087] Figure 5 A pixel circuit according to a second embodiment is shown. This embodiment differs from the first embodiment in that a row in one frame period includes pixels having different signal lines for supplying image signals. In other words, a row in any frame includes pixels connected to signal line 24A and pixels connected to signal line 24B as signal line 24 for supplying a signal voltage (image signal).

[0088] In the pixels in the M-th row of the L-th column and the (M+1)-th row of the L-th column, the signal line 24A is connected to the source electrode of the selection transistor 13A, and the signal line 24B is connected to the source electrode of the selection transistor 13B. In the pixels in the M-th row of the (L+1)-th column and the (M+1)-th row of the (L+1)-th column, the signal line 24B is connected to the source electrode of the selection transistor 13A, and the signal line 24A is connected to the source electrode of the selection transistor 13B.

[0089] Although the plan view is omitted, the signal lines 24A and 24B in the (L+1)th column correspond to the signal lines 24A and 24B in the Lth column, respectively. Therefore, the signal lines 24A and 24B in the (L+1)th column are parallel to the signal lines 24A and 24B in the Lth column, respectively. If the parasitic capacitance of the signal line 24A is greater than the parasitic capacitance of the signal line 24B in the Lth column, the parasitic capacitance of the signal line 24A is also greater than the parasitic capacitance of the signal line 24B in the (L+1)th column.

[0090] Pixels having different signal lines for supplying image signals coexist in the same row in such a manner that linear luminance unevenness generated between rows is averaged for every multiple columns, and display unevenness can be controlled.

[0091] This embodiment describes a structure in which the signal lines supplying image signals vary between odd-numbered and even-numbered columns. However, this structure is not limited to the above structure, as long as display unevenness can be controlled. For example, the signal lines supplying pixels can be varied for each column based on the characteristics of each pixel and the convenience of the wiring layout. To make display unevenness less noticeable, the columns where the signal lines supplying pixels vary can be randomly arranged.

[0092] (Third embodiment)

[0093] Figure 6 A pixel circuit according to a third embodiment is shown.

[0094] This embodiment differs from the first embodiment in that only pixels of a specific color have different paths through which data signals are written into the pixels (light-emitting elements) for each frame period.

[0095] The red (R) pixels, green (G) pixels, and blue (B) pixels are arranged in strips in the Mth, (M+1)th, and (M+2)th rows, respectively, and the red, green, and blue pixels are periodically arranged every three rows. In the red (R) and green (G) pixels in the Mth and (M+1)th rows, the signal line 24A is connected to the source electrode of the selection transistor 13A, and the signal line 24B is connected to the source electrode of the selection transistor 13B. In contrast, in the blue (B) pixel in the (M+2)th row, only one selection transistor 13 is arranged, and the signal line 24C is connected to the source electrode of the selection transistor 13.

[0096] In other words, according to this embodiment, the light-emitting elements 11 in a portion of the plurality of pixels include multiple paths through which the signal output from the data signal output unit is input, and the light-emitting elements 11 in the other portion of the plurality of pixels include one path through which the signal output from the data signal output unit is input. The color of light emitted is different between the pixel including two input paths and the pixel including one input path.

[0097] Will refer to Figure 7 To illustrate the use of this embodiment Figure 6 The present embodiment differs from the first embodiment in that the reference voltage and the signal voltage are always written to the pixel using the selection transistor 13 only in the (M+2)th row for driving the blue (B) pixel. The writing operation is performed simultaneously in the Mth row, the (M+1)th row, and the (M+2)th row in one horizontal scanning period, and the same circuit operation is performed simultaneously in the three rows in the horizontal scanning period of the (M+3)th row and subsequent rows.

[0098] As described above, the signal lines (input paths) used to supply image signals are changed for each frame period, giving priority to red (R) and green (G) pixels, which have high visibility and easily noticeable brightness differences. This also achieves the effect of controlling display unevenness. The blue (B) pixel select transistor is arranged in only one per pixel, which improves the freedom of pixel layout and allows for increased resolution while miniaturizing the pixels.

[0099] (Fourth embodiment)

[0100] A fourth embodiment of the present invention will be described below. Figure 8 A pixel circuit according to a fourth embodiment is shown.

[0101] This embodiment differs from the first embodiment in that one signal line is arranged for each column. The source electrodes of the selection transistors 13A and 13B in each pixel are connected to the same signal line 24.

[0102] Providing a plurality of selection transistors in each pixel even when there is a single signal line in each column makes it possible to provide a plurality of input paths through which signals from the data signal output unit are input to the light emitting element 11 .

[0103] Due to the layout of the pixel, the layout of the transistor and the wiring except the selection transistor can be different between pixels, and the parasitic capacitance of the first capacitor 16 for holding the signal can be different between pixels. In contrast, the display device according to the present embodiment includes two input paths to the pixel (light emitting element). Since the input paths are different, the signal voltage to be written in the first capacitor 16 can be changed using the parasitic capacitance difference etc. caused by the layout position of the scan line of the selection transistor. Therefore, the brightness difference between pixels can be reduced by selecting the input path to reduce the parasitic capacitance difference of the first capacitor 16.

[0104] Furthermore, in the display device according to this embodiment, the select transistor for writing a signal changes for each frame period, so the brightness difference between pixels can be averaged over multiple frames. Therefore, the brightness difference is averaged over time, and display unevenness can be controlled across the entire display panel.

[0105] (Fifth embodiment)

[0106] [Structure of Organic Light-Emitting Element]

[0107] An organic light-emitting element is constructed by forming an anode, an organic compound layer, and a cathode on a substrate. A protective layer and a color filter, etc., may be provided on the cathode. If a color filter is provided, a planarization layer may be provided between the protective layer and the color filter. The planarization layer may be made of, for example, acrylic resin.

[0108] [Substrate]

[0109] The substrate may include quartz, glass, silicon wafers, resins, and metals. Switching elements such as transistors and wiring may be disposed on the substrate, and an insulating layer may be disposed thereon. The insulating layer may be made of any material as long as contact holes can be formed thereon to ensure conduction between the anode and the wiring and insulation from unconnected wiring is ensured. For example, polyimide resins, silicon oxide, and silicon nitride may be used for the insulating layer.

[0110] [electrode]

[0111] A pair of electrodes can be used as the electrodes. This pair of electrodes can be an anode and a cathode. When an electric field is applied in the direction of light emission from the organic light-emitting element, the electrode with the higher potential is the anode, and the other electrode is the cathode. Alternatively, the electrode that supplies holes to the light-emitting layer is the anode, and the electrode that supplies electrons is the cathode.

[0112] A material having a work function as large as possible is suitable for the anode. For example, elemental metal substances such as gold, platinum, silver, copper, nickel, palladium, cobalt, selenium, vanadium and tungsten, as well as mixtures comprising these substances, can be used for the anode. Alternatively, alloys obtained by combining these substances can be used for the anode. For example, metal oxides such as tin oxide, zinc oxide, indium oxide, indium tin oxide (ITO) and indium zinc oxide can be used. In addition, conductive polymers such as polyaniline, polypyrrole and polythiophene can be used.

[0113] These electrode materials may be used alone or in combination of two or more materials.The anode may include a single layer or multiple layers.

[0114] When the electrode is used as a reflective electrode, for example, chromium, aluminum, silver, titanium, tungsten, molybdenum, alloys thereof, or stacked layers thereof can be used. When the electrode is used as a transparent electrode, a transparent conductive layer of an oxide made of, for example, indium tin oxide (ITO) and indium zinc oxide can be used, but the transparent electrode is not limited thereto. Photolithography technology can be used to form the electrode.

[0115] For the cathode, a material having a small work function is suitable. For example, alkali metals such as lithium, alkaline earth metals such as calcium, elemental metals such as aluminum, titanium, manganese, silver, lead and chromium, and mixtures thereof can be used. Alternatively, an alloy obtained by combining these elemental metals can be used. For example, alloys of magnesium-silver, aluminum-lithium, aluminum-magnesium, silver-copper and zinc-silver can be used. Metal oxides such as indium tin oxide (ITO) can also be used. The above-mentioned electrode materials can be used alone or in the form of a combination of two or more substances. In addition, the cathode can have a single-layer structure or a multilayer structure. In particular, silver can be used, and silver alloys can be used to control the aggregation of silver. As long as the aggregation of silver can be controlled, the ratio of the alloy is not important. For example, the ratio of the alloy can be 1:1.

[0116] The cathode is not particularly limited and can be formed as a top-emitting element having an oxide conductive layer such as ITO, or can be formed as a bottom-emitting element having a reflective electrode such as aluminum (Al). The method for forming the cathode is not particularly limited. However, if direct current (DC) sputtering or alternating current (AC) sputtering is used, the coverage of the film is good and the resistance can be easily reduced.

[0117] [Protective layer]

[0118] A protective layer can be provided on the cathode. For example, glass provided with a desiccant is bonded to the cathode, so that water or the like can be reduced or prevented from penetrating into the organic composite layer, and the occurrence of display defects can be controlled. As another embodiment, a passivation film made of silicon nitride or the like can be provided on the cathode to reduce or prevent water or the like from penetrating into the organic EL layer. For example, after the cathode is formed, the cathode can be transported to another chamber without breaking the vacuum, and a silicon nitride film with a thickness of 2 μm can be formed on the cathode as a protective layer by a chemical vapor deposition (CVD) method. The protective layer can be provided by an atomic layer deposition (ALD) method after film formation by a CVD method.

[0119] [Color Filter]

[0120] A color filter may be provided on the protective layer. For example, another substrate provided with a color filter tailored to the size of the organic light-emitting element may be bonded to the substrate provided with the organic light-emitting element, or the color filter may be patterned on the protective layer using photolithography. The color filter may be made of a polymer.

[0121] [Planarization layer]

[0122] The planarization layer may be included between the color filter and the protective layer. The planarization layer may be made of an organic compound. The organic compound may be a low molecular weight or a macromolecular compound, in particular, a macromolecular compound.

[0123] The planarization layer may be provided above and below the color filter and may be made of the same or different constituent materials. More specifically, polyvinyl carbazole resin, polycarbonate resin, polyester resin, acrylonitrile-butadiene-styrene (ABS) resin, acrylic resin, polyimide resin, phenolic resin, epoxy resin, silicone resin, urea-formaldehyde resin, etc. may be used.

[0124] [Counter substrate]

[0125] A counter substrate may be provided on the planarization layer. The counter substrate is provided facing the substrate, and is therefore referred to as a counter substrate. The counter substrate may be made of the same material as the substrate.

[0126] [Organic layer]

[0127] The organic compound layers (hole injection layer, hole transport layer, electron blocking layer, light emitting layer, hole blocking layer, electron transport layer and electron injection layer, etc.) included in the organic light emitting element according to an embodiment of the present invention are formed by the method described below.

[0128] The organic compound layer included in the organic light-emitting element according to an embodiment of the present invention can be formed by a dry process such as vacuum vapor deposition, ionization vapor deposition, sputtering, and plasma. Instead of a dry process, a wet process can be used in which the organic compound layer is formed by a known coating method (for example, spin coating, dipping, casting, Langmuir-Blodgett (LB) method, and inkjet method) using an appropriate solvent that dissolves the organic compound.

[0129] If the organic compound layer is formed by vacuum vapor deposition or solution coating, the resulting layer hardly undergoes crystallization and has excellent stability over time. In addition, if the film of the organic compound layer is formed by coating, the film can be formed in combination with an appropriate binder resin.

[0130] The binder resin includes polyvinyl carbazole resin, polycarbonate resin, polyester resin, ABS resin, acrylic resin, polyimide resin, phenol resin, epoxy resin, silicone resin and urea resin. These resins are just examples, and the binder resin is not limited thereto.

[0131] These binder resins may be used singly as a homopolymer or a copolymer, or may be used by mixing two or more resins. In addition, known additives such as a plasticizer, an antioxidant, and an ultraviolet absorber may be used together as needed.

[0132] [Application of display devices]

[0133] The display devices according to the first to fourth embodiments can be used as display units for various electronic devices. Examples of electronic devices include digital cameras, video cameras, head-mounted displays (head-mounted displays), game consoles, car navigation devices, personal computers, portable information terminals, electronic books, and television receivers. Specific examples will be described below with reference to the accompanying drawings.

[0134] Figure 9A 、 9B 9C each shows an application example of the display device according to the first to fourth embodiments. The display device according to any one of the first to fourth embodiments is applied to an information display device such as a viewfinder of a camera, a head-mounted display, and smart glasses.

[0135] Figure 9AThis is a schematic diagram of an example display device used as a viewfinder for an imaging device such as a camera. Display device 212 emits display light 217 and infrared light 218, which travel through the same optical component 222 to reach the user's eyeball 216. Infrared light 218 reflected by the user's eyeball 216 is converted into electronic information by imaging device 223, which includes an imaging element. This electronic information is used to detect line of sight. Instead of providing imaging device 223, display device 212 may be provided with an imaging element on an insulating layer and function as both a display and imaging device.

[0136] Figure 9B An example of an imaging apparatus such as a camera is shown. The imaging apparatus 224 includes a viewfinder 225 , a display 226 , an operation unit 227 , and a housing 228 . Figure 9A The display device is arranged in the viewfinder 225.

[0137] Figure 9A While the example in which display light 217 and infrared light 218 pass through the same optical member 222 is shown, separate optical members may be provided for display light 217 and infrared light 218. Instead of providing an imaging device, the display device may include an imaging element on a substrate and function as both a display and imaging device. Information related to the detected line of sight (also referred to as line of sight information) can be used to control the display device and various devices connected to the display device, such as controlling camera focus, controlling the resolution of displayed images, and replacing button operations.

[0138] A display device according to an embodiment of the present invention may include an imaging device including a light receiving element, and control a display image of the display device based on visual line information of a user from the imaging device.

[0139] More specifically, the display device determines a first viewing area at which the user is looking, and a second viewing area outside the first viewing area, based on the line of sight information. The first viewing area and the second viewing area may be determined by the display device's control device, or may be determined by an external control device. Within the display area of the display device, the display resolution of the first viewing area may be controlled to be higher than the display resolution of the second viewing area. In other words, the resolution of the second viewing area may be lower than that of the first viewing area.

[0140] The display area includes a first display area and a second display area different from the first display area, and an area with a higher priority is determined from the first display area and the second display area based on the line of sight information. The first display area and the second display area can be determined by a control device of the display device, or the first display area and the second display area determined by an external control device can be received. The resolution of the area with a higher priority can be controlled to be higher than the resolution of areas other than the area with a higher priority. In other words, the resolution of the area with a relatively low priority can be reduced.

[0141] Artificial intelligence (AI) can be used to determine the first viewing area and the area with higher priority. The AI can be a model that uses an image of the eyeball and the direction the eyeball is actually looking in the image as teaching data, and estimates the angle of sight and the distance to the target object in front of the sight based on the image of the eyeball. The AI program can be included in the display device, the camera device, or the external device. In the case where the AI program is included in the external device, the AI program is sent to the display device through communication.

[0142] In the case of display control based on visual recognition and detection, the display device can be applied to smart glasses, which also include a camera for capturing external images. The smart glasses can display information related to the captured external environment in real time.

[0143] In addition, the display device may be provided with a first imaging device including a light receiving element for receiving infrared light, and a second imaging device including a light receiving element different from that in the first imaging device and capturing an image of the outside. The imaging resolution of the second imaging device is controlled based on information related to the line of sight of the user of the first imaging device. Compared with the area with a higher priority for imaging resolution, the resolution of other areas is reduced, so the amount of information may be reduced. Therefore, power consumption and display delay may be reduced. The area with a higher priority can be regarded as the first imaging area, and the area with a lower priority than the first imaging area can be regarded as the second imaging area.

[0144] Figure 9C is a schematic diagram of an example of smart glasses. The display and camera device 229 represented by the smart glasses includes a control unit 230, a transparent display unit 231, and an external camera unit (not shown). In the case where the display device is applied to the smart glasses, both the display device and the external camera can be controlled based on the detected line of sight information, and power consumption and display delay can be reduced. For example, in the display area, in areas other than the area where the user is looking, the display and camera resolution is reduced, so that the amount of information in both the camera and the display may be reduced. Therefore, power consumption and display delay may be reduced.

[0145] The display devices according to the first to fourth embodiments can be used as structural members of the display devices and lighting devices described below. In addition, the display devices can be applied to exposure light sources of electrophotographic image forming devices, backlights of liquid crystal display devices, and light-emitting devices including color filters in white light sources.

[0146] The display device can be an image information processing device, which includes an image input unit for inputting image information from an area charge coupled device (CCD), a linear CCD, a memory card, etc., and an information processing unit for processing the input information, and displays the input image on the display unit.

[0147] The display unit included in the imaging device and inkjet printer may have a touch panel function. The method used to drive the touch panel function may be infrared, capacitive, resistive, or electromagnetic induction, and is not particularly limited. The display device may be used in the display unit of a multifunction printer.

[0148] Next, the display device according to the present embodiment will be described with reference to the drawings. Figure 10 FIG2 is a schematic cross-sectional view of an example of a display device including an organic light emitting element and a thin film transistor (TFT) element connected to the organic light emitting element. The TFT element is an example of an active element.

[0149] Figure 10 The display device 110 includes a substrate 111 such as glass and a moisture-proof film 112 provided on the substrate 111 to protect a TFT element or an organic compound layer. The display device 110 also includes a metal gate electrode 113, a gate insulating film 114, and a semiconductor layer 115.

[0150] TFT element 118 includes semiconductor layer 115, drain electrode 116, and source electrode 117. An insulating film 119 is provided on TFT element 118. Anode 121 forming an organic light emitting element and source electrode 117 are connected to each other via contact hole 120.

[0151] The method for electrically connecting the electrodes (anode and cathode) included in the organic light emitting element and the electrodes (source electrode and drain electrode) included in the TFT is not limited to Figure 10 In other words, any one of the anode and the cathode can be electrically connected to any one of the source electrode and the drain electrode of the TFT element.

[0152] exist Figure 10 In the display device 110, the organic compound layer is shown as a single layer, but the organic compound layer 122 may include a plurality of layers. A first protective layer 124 and a second protective layer 125 are provided on the cathode 123 to control degradation of the organic light emitting element.

[0153] Figure 10 The display device 110 uses transistors as switching elements, but a metal-insulator-metal (MIM) element may be used as the switching element instead of the transistor.

[0154] Figure 10 The transistors used in the display device 110 are not limited to transistors having a single crystal silicon wafer and may be thin film transistors including an active layer on an insulating surface of a substrate. The active layer may include single crystal silicon, amorphous silicon, non-single crystal silicon (such as microcrystalline silicon), and non-single crystal oxide semiconductors (such as indium zinc oxide and indium gallium zinc oxide). Thin film transistors are also called TFT elements.

[0155] Figure 10 The transistor included in the display device 110 can be formed within a substrate such as a silicon (Si) substrate. Here, the description "formed within a substrate" means that the transistor is manufactured by processing the substrate itself such as a Si substrate. In other words, the fact that the transistor is included within the substrate can be regarded as meaning that the substrate and the transistor are formed integrally.

[0156] The luminous brightness of the organic light-emitting element according to the present embodiment is controlled by a TFT as an example of a switching element, and the organic light-emitting element is provided on a plurality of surfaces, so that an image can be displayed at various luminous brightnesses. The switching element according to the present embodiment is not limited to a TFT, and may be a transistor formed of low-temperature polysilicon and an active matrix driver formed on a substrate such as a Si substrate. The term "on a substrate" may also mean "within a substrate." Whether to provide a transistor within the substrate or to use a TFT is selected based on the size of the display unit. For example, in a case where the size of the display unit is approximately 0.5 inches, an organic light-emitting element may be provided on a Si substrate.

[0157] Figure 11 1 is a schematic diagram of an example of a display device according to this embodiment. The display device 1000 may include 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. The touch panel 1003 and the display panel 1005 are connected to flexible printed circuit boards (FPCs) 1002 and 1004, respectively. Transistors are printed on the circuit board 1007. If the display device is not a portable device, the battery 1008 may not be provided, or even if the display device is a portable device, the battery 1008 may be provided elsewhere.

[0158] The display device according to this embodiment can be used as a display unit of a photoelectric conversion device, which includes an optical unit including a plurality of lenses and an imaging element for receiving light that has passed through the optical unit. The photoelectric conversion device may include a display unit that displays information obtained by the imaging element. The photoelectric conversion device may use the information obtained by the imaging element to obtain information, and the display unit may display information different from the obtained information. The display unit may be exposed to the outside of the photoelectric conversion device or may be arranged in a viewfinder. The photoelectric conversion device may be a digital camera or a digital video camera.

[0159] Figure 12A 1 is a schematic diagram of an example of a photoelectric conversion device according to this embodiment. Photoelectric conversion device 1100 may include a viewfinder 1101, a rear display 1102, an operating unit 1103, and a housing 1104. Viewfinder 1101 may include a display device according to any of the first to fourth embodiments. In this case, the display device may not only display the image to be captured, but also display environmental information, shooting instructions, and the like. Environmental information may include the intensity and direction of external light, the speed of movement of the subject, and the possibility that the subject is obscured by shielding material.

[0160] The timing suitable for capturing images is short, allowing information to be displayed as quickly as possible. Therefore, the display device using an organic light-emitting element according to the present invention can be used. This is because organic light-emitting elements have a high response speed. As mentioned above, display devices using organic light-emitting elements are more suitable than liquid crystal display devices for the above-mentioned devices requiring high display speeds.

[0161] The photoelectric conversion device 1100 includes an optical unit (not shown). The optical unit includes a plurality of lenses and forms an image on an image pickup element housed in a housing 1104. The focus can be adjusted by adjusting the relative positions of the plurality of lenses. This adjustment operation can be performed automatically.

[0162] The display device according to the present embodiment may include a color filter having red, green, and blue colors, wherein the red, green, and blue colors are arranged in a delta arrangement.

[0163] The display device according to this embodiment can be used as a display unit of a mobile terminal. In this case, the display device can have both display functions and operation functions. Mobile terminals include mobile phones such as smartphones, tablet computers, and the above-mentioned head-mounted displays.

[0164] Figure 12B1 is a schematic diagram of an example of an electronic device according to this embodiment. Electronic device 1200 includes a display unit 1201, an operating unit 1202, and a housing 1203. Housing 1203 may include a circuit, a printed circuit board including the circuit, a battery, and a communication unit. Operating unit 1202 may be a button or a touch panel-type reaction unit. Operating unit 1202 may be a liveness recognition unit that recognizes a fingerprint to, for example, release a lock. An electronic device including a communication unit may be considered a communication device. The display unit may include a display device according to any one of the first to fourth embodiments.

[0165] Figure 13A and 13B Each is a schematic diagram of an example of the display device according to the present embodiment. Figure 13A 13. A display device such as a television monitor and a personal computer (PC) monitor is shown. A display device 1300 includes a housing 1301 and a display unit 1302. The display devices according to the first to fourth embodiments can be used in the display unit 1302.

[0166] The display device includes a base 1303 that supports a frame 1301 and a display unit 1302. The base 1303 is not limited to Figure 13A The lower portion of the frame 1301 can be used as a base 1303 .

[0167] The frame 1301 and the display unit 1302 may be curved, and the curvature radius thereof may be greater than or equal to 5000 mm and less than or equal to 6000 mm.

[0168] Figure 13B is a schematic diagram of another example of the display device according to the present embodiment. Figure 13B The display device 1310 in the embodiment is configured to be foldable and is a foldable display device. The display device 1310 includes a first display unit 1311, a second display unit 1312, a housing 1313, and a bending point 1314. The first display unit 1311 and the second display unit 1312 may include a light-emitting device according to any one of the first to fourth embodiments. The first display unit 1311 and the second display unit 1312 may be a single display device without a seam. The first display unit 1311 and the second display unit 1312 may be separated at the bending point 1314. The first display unit 1311 and the second display unit 1312 may each display different images and may display a single image together.

[0169] Figure 14A14 is a schematic diagram of an example of a lighting device according to this embodiment. Lighting device 1400 may include a housing 1401, a light source 1402, a circuit board 1403, an optical film 1404, and a light diffusion unit 1405. Light source 1402 may include a display device according to any of the first to fourth embodiments. In this case, the image data input to each pixel does not form an image in the case of display data, but may be a signal corresponding to the same brightness.

[0170] The optical filter can improve the color rendering of the light source 1402. The light diffuser 1405 can effectively diffuse (e.g., illuminate) the light from the light source 1402 and transmit the light over a wide range. The optical filter and the light diffuser 1405 can be transparent and arranged on the light-emitting side of the lighting device 1400. If necessary, a cover can be provided on the outermost side of the lighting device 1400.

[0171] A lighting device, for example, is a device for illuminating a room. The lighting device can emit white light, daylight white light, or any other color from blue to red. The lighting device may include a light control circuit for controlling the light. The lighting device may include an organic light-emitting element according to the present invention and a power supply circuit connected to the organic light-emitting element. The power supply circuit converts AC voltage into DC voltage. The color temperature of white is 4200K, and the color temperature of daylight white is 5000K. The lighting device may include a color filter.

[0172] The lighting device according to the present embodiment may include a heat dissipation unit that dissipates heat within the device to the outside and may include a metal having a high specific heat and liquid silicon.

[0173] Figure 14B 15 is a schematic diagram of a vehicle as an example of a mobile body according to the present embodiment. The vehicle includes taillights as an example of lighting means. Vehicle 1500 includes taillights 1501 that are illuminated when a braking operation is performed, etc.

[0174] Taillight 1501 may include the display device according to any of the first to fourth embodiments as a lighting device. Taillight 1501 may include a protective member for protecting the organic EL element. The protective member may be made of any material that is transparent and has a certain degree of strength, and may be made of polycarbonate, etc. Polycarbonate may be mixed with a furandicarboxylic acid derivative, an acrylonitrile derivative, etc.

[0175] Vehicle 1500 may include a vehicle body 1503 and a window 1502 mounted on vehicle body 1503. If window 1502 is not used for front and rear inspection of the vehicle, it may be a transparent display. The transparent display may include the display device according to any of the first to fourth embodiments. In this case, the transparent member serves as a constituent material for electrodes, etc., included in the organic light-emitting element.

[0176] The mobile object according to this embodiment may be a ship, an aircraft, an unmanned aerial vehicle, or the like. The mobile object may include a main body and a lighting device attached to the main body. The lighting device may emit light to indicate the position of the main body. The lighting device may include the display device according to any one of the first to fourth embodiments as the lighting device.

[0177] As described above, use of the display device according to any one of the first to fourth embodiments realizes display that is excellent in image quality and stable for a long time.

[0178] As described above, according to the present invention, a display device with improved image quality can be provided.

[0179] While the present invention has been described with reference to embodiments, it is to be understood that the invention is not limited to the disclosed embodiments.The scope of the following claims is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures and functions.

Claims

1. A display device, comprising: Data signal output unit; a first signal line connected to the data signal output unit; a second signal line connected to the data signal output unit, the second signal line being different from the first signal line; a first light-emitting element; a first transistor connected to the first light emitting element and including a gate; a first capacitive element comprising a first node and a second node; a second transistor provided on a first input path through which a signal from the data signal output unit is input to the gate, and wherein the first input path includes the first signal line; as well as a third transistor provided on a second input path, a signal from the data signal output unit being input to the gate via the second input path, the second input path including the second signal line, the second input path being different from the first input path, wherein the first node is connected to the second transistor, the third transistor and the gate, wherein the second node is configured to be supplied with a power supply potential, wherein either the first input path or the second input path can input the signal from the data signal output unit to the first light emitting element; wherein, in a first frame period, a signal from the data signal output unit is input to the first light-emitting element via the first input path in a state where the second input path is electrically interrupted, and the second input path is electrically interrupted throughout the first frame period; and In which, in a second frame time period after the first frame time period, the signal from the data signal output unit is input to the first light-emitting element via the second input path while the first input path is electrically interrupted, and the first input path is electrically interrupted during the entire second frame time period.

2. The display device according to claim 1, wherein A source or a drain included in the first transistor is connected to the first light emitting element.

3. The display device according to claim 1, wherein When the second transistor is in an on-state, the first signal line is in a floating state, and when the third transistor is in an on-state, the second signal line is in a floating state.

4. The display device according to claim 1, in, In a state where the second input path is electrically interrupted at a first moment, a signal from the data signal output unit is input to the first light emitting element via the first input path, and In a state where the first input path is electrically interrupted at a second time different from the first time, the signal from the data signal output unit is input to the first light emitting element via the second input path.

5. The display device according to claim 1, further comprising: a second light-emitting element; a third input path, through which the signal from the data signal output unit is input to the second light-emitting element; as well as a fourth input path, through which the signal from the data signal output unit is input to the second light emitting element, and the fourth input path is different from the third input path, Wherein, the third input path includes the first signal line, and The fourth input path includes the second signal line.

6. The display device according to claim 5, in, In the first frame period, in a state where the third input path is electrically interrupted, a signal from the data signal output unit is input to the second light emitting element via the fourth input path, and In the second frame period after the first frame period, in a state where the fourth input path is electrically interrupted, the signal from the data signal output unit is input to the second light emitting element via the third input path.

7. The display device according to claim 6, wherein The first light emitting element and the second light emitting element are adjacent to each other in a direction parallel to the first signal line.

8. The display device according to claim 1, further comprising: a third light-emitting element; a fifth input path, through which the signal from the data signal output unit is input to the third light-emitting element; as well as a sixth input path, through which the signal from the data signal output unit is input to the third light-emitting element, and the sixth input path is different from the fifth input path, wherein the fifth input path includes a third signal line different from the first signal line and the second signal line, wherein the sixth input path includes a fourth signal line different from the first signal line, the second signal line, and the third signal line; The parasitic capacitance of the first signal line is greater than the parasitic capacitance of the second signal line, and the parasitic capacitance of the third signal line is greater than the parasitic capacitance of the fourth signal line. wherein, in a first frame period, in a state where the second input path is electrically interrupted, the signal from the data signal output unit is input to the first light-emitting element via the first input path, and in a state where the fifth input path is electrically interrupted, the signal from the data signal output unit is input to the third light-emitting element via the sixth input path, and In which, in a second frame time period after the first frame time period, when the first input path is electrically interrupted, the signal from the data signal output unit is input to the first light-emitting element via the second input path, and when the sixth input path is electrically interrupted, the signal from the data signal output unit is input to the third light-emitting element via the fifth input path.

9. The display device according to claim 8, further comprising: a fourth light-emitting element; as well as a seventh input path, through which the signal from the data signal output unit is input to the fourth light-emitting element; The seventh input path includes a fifth signal line different from the first to fourth signal lines and a fourth transistor, and The input path of the signal from the data signal output unit to the fourth light-emitting element is only the seventh input path.

10. The display device according to claim 9, in, The pixel including the first light-emitting element is a pixel that emits light of a first color, and The pixel including the third light-emitting element is a pixel that emits light of a second color different from the first color.

11. An information display device comprising: Camera element; as well as The display device according to any one of claims 1 to 10, The display image of the display device is controlled based on the information related to the user's line of sight from the imaging element.

12. A photoelectric conversion device comprising: an optical unit comprising a plurality of lenses; an imaging element configured to receive light having passed through the optical unit; as well as a display unit configured to display the image captured by the imaging element, Wherein, the display unit comprises the display device according to any one of claims 1 to 10.

13. An electronic device comprising: A display unit comprising the display device according to any one of claims 1 to 10; A housing for equipping the display unit; as well as A communication unit is disposed in the housing and configured to communicate with the outside.

14. A lighting device comprising: A light source comprising a display device according to any one of claims 1 to 10; as well as A light diffusion unit or an optical film through which light emitted from the light source passes.

15. A mobile object, comprising: A lighting tool comprising a display device according to any one of claims 1 to 10; as well as The main body is used to equip the lighting tool.

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