Display device, information display device, and electronic device

Abstract

To provide a display device which offers further improved unevenness in brightness among pixels.SOLUTION: An aspect of the present invention relates to a display device comprising a data signal output unit, first light-emitting elements, a first input route for feeding a signal from the data signal output unit to the first light-emitting elements, and a second input route, different from the first input route, for feeding the signal from the data signal output unit to the first light-emitting units.SELECTED DRAWING: Figure 2

Description

[Technical Field]

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

[0002] An example of a display device is an active matrix organic EL display device, which controls video signals supplied to display elements using transistors in pixels.

[0003] Patent Document 1 discloses a display device having a pixel configuration in which a plurality of signal lines are provided for each column in order to increase speed. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-15276 Summary of the Invention [Problem to be solved by the invention]

[0005] The prior art leaves room for improvement in image quality. For example, in an organic EL display device, the parasitic capacitance of the capacitance 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, which can cause brightness unevenness between pixels. The configuration of Cited Document 1 leaves room for improvement in brightness unevenness between pixels, such as the occurrence of houndstooth-like display unevenness. [Means for solving the problem]

[0006] One aspect relates to a display device having a data signal output unit, a first light-emitting element, a first input path for inputting a signal from the data signal output unit to the first light-emitting element, and a second input path different from the first input path for inputting a signal from the data signal output unit to the first light-emitting element.

[0007] Another embodiment relates to a display device having a plurality of pixels, a plurality of signal lines, and a data signal output section, each of the plurality of pixels having a first light-emitting element, a first transistor having one of a source or a drain connected to the 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 of the plurality of signal lines and the gate of the first transistor. [Effects of the Invention]

[0008] To provide a display device with improved image quality. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a conceptual diagram of an overall display device according to an embodiment of the present invention; [Figure 2] 1 is an example of an equivalent circuit diagram of some pixels according to an embodiment; [Figure 3] 1 is a conceptual diagram of an interface of a display device according to an embodiment of the present invention; [Figure 4] Example of a driving method for a signal selection circuit according to an embodiment [Figure 5] 1 is an example of an equivalent circuit diagram of some pixels according to an embodiment; [Figure 6] 1 is an example of an equivalent circuit diagram of some pixels according to an embodiment; [Figure 7] Example of a driving method for a signal selection circuit according to an embodiment [Figure 8] 1 is an example of an equivalent circuit diagram of some pixels according to an embodiment; [Figure 9] 1 is a schematic cross-sectional view of an example of a display device according to an embodiment; [Figure 10] Schematic diagram illustrating an application example of a display device according to an embodiment. [Figure 11] 1 is a schematic cross-sectional view of an example of a display device according to an embodiment; [Figure 12] FIG. 1A is a schematic diagram illustrating an example of an imaging device according to an embodiment; FIG. 1B is a schematic diagram illustrating an example of an electronic device according to an embodiment; [Figure 13]FIG. 1A is a schematic diagram illustrating an example of a display device according to an embodiment; FIG. 1B is a schematic diagram illustrating an example of a foldable display device; [Figure 14] FIG. 1A is a schematic diagram showing an example of a lighting device according to an embodiment; FIG. 1B is a schematic diagram showing an example of a vehicle having a vehicle lamp according to an embodiment; [Figure 15] Example of equivalent circuit diagram of some conventional pixels [Figure 16] Example of a conventional signal selection circuit driving method DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, specific embodiments and application examples of the display device according to the embodiment will be described with reference to the accompanying drawings. Note that in the following description and drawings, common reference numerals are used to designate components common to multiple drawings. Therefore, the common components will be described with mutual reference to multiple drawings, and descriptions of the components with common reference numerals will be omitted as appropriate.

[0011] (First embodiment) The display device according to this embodiment will be described with reference to the drawings.

[0012] FIG. 1 is an overall schematic diagram showing an example of a display device according to this embodiment. The display device of FIG. 1 includes a pixel region 1, a horizontal drive circuit 2, a vertical drive circuit 3, and a connection terminal section 4. A plurality of pixels are arranged in a matrix in the pixel region 1, and the pixel circuits shown in FIG. 2 are arranged in the pixel region 1 for each color. Each pixel emits light of one of red (R), green (G), or blue (B), and has an organic EL element which is a light-emitting element. The horizontal drive circuit 2 is a circuit which outputs data signals (image signals and reference voltages) and is connected to output lines.

[0013] In this specification, the term "arranged in a matrix" does not necessarily mean that light-emitting elements and drive circuits for the light-emitting elements are arranged in a grid pattern in the row and column directions, but also means that pixels are systematically arranged in a matrix across the entire pixel area. For example, consider a display device in which R pixel light-emitting elements are arranged in the Lth column (L is a natural number), G pixel light-emitting elements are arranged in the L+1th column, and B pixel light-emitting elements are arranged in the L+2th column. In this case, the matrix arrangement also includes a case in which the R pixel and B pixel light-emitting elements are aligned in a straight line across M rows, and the G pixel light-emitting element is arranged between the R pixel light-emitting element and the G pixel light-emitting element at a position offset by half a row from the R pixel and B pixel light-emitting element.

[0014] The vertical drive circuit 3 is a circuit that outputs a selection signal. The connection terminal unit 4 is a terminal that inputs signals such as clock signals and data signals 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 by wiring (not shown).

[0015] Here, a pixel circuit used in the display device of this embodiment will be described with reference to Fig. 2. In Fig. 2, a pixel 10 has a current-driven light-emitting element 11 whose light emission luminance changes according to the current flowing through the organic EL element, and a drive circuit that drives the light-emitting element 11. One electrode of the light-emitting element 11 is connected to a common power supply 25 that is wired in common to all pixels 10. Here, an example is shown in which the cathode electrode of the light-emitting element 11 is connected to the common power supply 25.

[0016] The drive circuit that drives the light-emitting element 11 includes a drive transistor 12, a selection transistor 13A, a selection transistor 13B, a switching transistor 14, a switching transistor 15, a first capacitance element 16, and a second capacitance element 17. Here, an example is shown in which P-channel transistors are used as the drive transistor 12, the selection transistor 13, the switching transistor 14, and the switching transistor 15.

[0017] In this specification, when referring to a specific selection transistor among the multiple selection transistors 13A and 13B, a subscript is added after the reference number, such as selection transistor 13A. When referring to either or both, the term is simply referred to as selection transistor 13. This also applies to other components.

[0018] The driving transistor 12 is connected in series to the light-emitting element 11 to supply a driving current to the light-emitting element 11. 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 a signal input to the gate electrode of the driving transistor 12.

[0019] The selection transistor 13A has a gate electrode connected to a scanning line, a source electrode connected to a signal line 24A, and a drain electrode connected to the gate electrode of the drive transistor 12. The selection transistor 13B has a gate electrode connected to a scanning line, a source electrode connected to a signal line 24B, and a drain electrode connected to the gate electrode of the drive transistor 12. In other words, two selection transistors 13 are provided for one pixel 10, and therefore there are two input paths through which signals from the horizontal drive circuit 2, which is a data signal output section, are input to the pixel 10.

[0020] A signal written from the vertical drive circuit 3 through a scanning line 21A is applied to the gate electrode of the selection transistor 13A. A signal written from the vertical drive circuit 3 through a scanning line 21B is applied to the gate electrode of the selection transistor 13B. The on / off of the selection transistors 13A and 13B is controlled by the signals written via the scanning lines 21A and 21B, respectively.

[0021] 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 is electrically connected, and 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 disconnected. The same applies to the signal line 24B and the selection transistor 13B.

[0022] The display device according to this embodiment includes a horizontal drive circuit 2 serving as a data signal output unit, a light-emitting element 11, and a first input path and a second input path for inputting a signal from the data signal output unit to the light-emitting element. The second input path is an input path different from the first input path. For example, in FIG. 1, for a light-emitting element in a pixel located in L columns and M rows, the first input path includes a signal line 24A and a selection transistor 13A, and the second input path includes a signal line 24B and a selection transistor 13B.

[0023] The switching transistor 14 has a gate electrode connected to the scanning line 22, a source electrode connected to the first power supply potential VDD, and a drain electrode connected to the source electrode of the driving transistor 12. A signal for controlling light emission is applied to the gate electrode of the switching transistor 14 from the vertical driving circuit 3 through the scanning line 22.

[0024] The switching transistor 15 has a gate electrode connected to the scanning line 23, a source electrode connected to the second power supply potential VSS, and a drain electrode connected to the anode electrode of the light-emitting element 11. 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.

[0025] The first capacitance element 16 is connected between the gate electrode and source electrode of the driving transistor 12. The second capacitance element 17 is connected between the source electrode of the driving transistor 12 and the first power supply potential VDD.

[0026] The vertical drive circuit 3, to which the scanning lines 21A, 21B, 22, and 23 are connected, supplies signals sequentially row by row, thereby causing the signal voltage and reference voltage to be held in the holding capacitance element of each pixel, and controls the pixel to emit light at a brightness corresponding to the signal voltage.

[0027] The pixel circuit in the Mth row and the pixel circuit in the (M+1)th row have the same circuit configuration, and the pixel circuit in the Lth column and the pixel circuit in the (L+1)th column also have the same circuit configuration.

[0028] In the pixel 10 configured as described above, the selection transistors 13A and 13B are rendered conductive in response to a write signal applied to their gate electrodes from the vertical drive circuit 3 via the scanning lines 21A and 21B. This operation samples a signal voltage or reference voltage corresponding to brightness information and writes it into the pixel 10. By applying the reference voltage, variations in the threshold voltage of the drive transistor 12 of each pixel can be corrected, thereby reducing variations in brightness of each pixel caused by variations in threshold voltage. The written signal voltage or reference voltage is applied to the gate electrode of the drive transistor 12 and is held in the first capacitance element 16.

[0029] The driving transistor 12 is designed to operate in a saturation region. The driving transistor 12 receives a current from the power supply potential VDD via the switching transistor 14, and drives the light emitting element 11 to emit light. At this time, the amount of current flowing through the light emitting element 11 is determined according to the voltage held in the first capacitance element 16, so the amount of light emitted by the light emitting element 11 can be controlled. The switching transistor 14 is rendered conductive when a signal for controlling light emission is applied to its gate electrode from the vertical driving circuit 3 via the scanning line 22. In other words, it has the function of controlling whether the light emitting element 11 emits light or not.

[0030] The switching transistor 15 selectively supplies a second power supply potential VSS to the anode electrode when a signal for controlling the potential of the anode electrode of the light-emitting element 11 is applied to its gate electrode from the vertical drive circuit 3 via the scanning line 23. If the potential of the common power supply 25 connected to the cathode electrode of the light-emitting element 11 is a cathode electrode potential Vcath and the threshold voltage of the light-emitting element 11 is a threshold voltage Vthel, the power supply potential VSS is designed to satisfy the condition VSS < Vcath + Vthel. This allows a reverse bias to be applied to the light-emitting element 11 when the switching transistor 15 is in a conductive state, controlling the light-emitting element 11 to a non-emitting state.

[0031] 2 uses PMOS transistors as MOS transistors, but NMOS transistors may also be used. Also, while a 5Tr2C configuration consisting of five transistors and two capacitive elements is shown as the drive circuit for light-emitting element 11, the drive circuit is not limited to this circuit configuration. Also, transistors formed on a silicon wafer or thin-film transistors formed on a glass substrate may be used as MOS transistors.

[0032] The configuration of an interface that transmits data signals to signal lines 24 will be described using Figure 3. A signal selection circuit 31 is disposed between the horizontal driver 2 and signal lines 24 in the display device. The signal selection circuit 31 is a circuit that can selectively output data signals 32 to signal lines 24 connected to its output terminal, and a switch circuit is provided for each output terminal. If the number of signal lines 24 output from one signal selection circuit 31 is M and the number of signal selection circuits 31 is N, the total number of signal lines 24 is MxN.

[0033] 3 shows an example of a configuration in which six signal lines 24 can be output to one signal selection circuit 31, and six switch circuits are also provided for one signal selection circuit 31. In this case, the switch circuits are used to perform six signal voltage write operations within one horizontal scanning period. Signal line 24A and signal line 24B may be connected to the same signal selection circuit 31, or may be connected to different signal selection circuits 31.

[0034] Because the signal line 24 has wiring capacitance, the signal line 24 is in a floating state and holds the signal voltage during the period when no write operation is being performed by the switch circuit provided in the signal selection circuit 31. 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.

[0035] By providing multiple signal lines for one column, different signals can be supplied simultaneously to multiple rows, which shortens the time required to write to each pixel in one frame and improves the frame rate at which images are displayed.

[0036] Furthermore, even when multiple signal lines are not connected to the same signal selection circuit 31, the time required to write to each pixel in one frame can be shortened, thereby improving the frame rate. This is because, if there is one signal line per column, after a signal is supplied to the signal line, the signal of the next row cannot be supplied to that row until the potential of the signal line has settled. On the other hand, because multiple signal lines are arranged in one column, a signal can be supplied from another signal line to pixels in another row of the same column while the potential of the signal supplied via one signal line is settling.

[0037] A driving method of this embodiment using the pixel circuit of FIG. 2 will be described with reference to FIG.

[0038] During the Nth frame period, in order to perform threshold correction of the drive transistor of each pixel, the switch circuits for each output terminal in the signal selection circuit 31 are turned on at the same timing while a reference voltage (Vref) is being supplied as the data signal 32.

[0039] After the reference voltage Vref is simultaneously written to the signal lines 24A and 24B, the selection transistor 13B in the Mth row is kept in the off state, while the selection transistor 13A in the Mth row is turned on, thereby sampling the reference voltage and writing it into the pixel in the Mth row.

[0040] Similarly, the reference voltage is sampled and written into the pixels in the (M+1)th row by turning on the selection transistor 13B in the (M+1)th row while keeping the selection transistor 13A in the (M+1)th row in the off state. That is, the reference voltage supplied from the signal line 24A is written into the pixels in the Mth row, and the reference voltage supplied from the signal line 24B is written into the pixels in the (M+1)th row.

[0041] Thereafter, while a signal voltage (Vsig) (image signal) is being supplied as the data signal 32, the switch circuits in the corresponding signal selection circuits 31 are sequentially turned on to write the signal voltage Vsig to the signal lines 24A and 24B. After that, at a certain time, the selection transistor 13B in the Mth row is kept off while the selection transistor 13A in the Mth row is turned on, thereby writing the signal voltage into the pixel in the Mth row. Next, the selection transistor 13A in the M+1th row is kept off while the selection transistor 13B in the Mth row is turned on, thereby writing the signal voltage into the pixel in the M+1th row.

[0042] That is, in the pixel on the Mth row, the signal voltage from the data signal output unit is written to the pixel via the input path including the signal line 24A and the selection transistor 13B, while the input path including the signal line 24B and the selection transistor 13B is electrically disconnected. Also, in the pixel on the (M+1)th row, the signal voltage from the data signal output unit is written to the pixel via the input path including the signal line 24B and the selection transistor 13B, while the input path including the signal line 24A and the selection transistor 13B is electrically disconnected.

[0043] These operations are performed simultaneously on the Mth row and the (M+1)th row within one horizontal period, and similar circuit operations are repeated simultaneously on two rows in the horizontal scanning periods from the (M+2)th row onwards.

[0044] 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.

[0045] 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. That is, in the pixels in the Mth row, the reference voltage supplied from the signal line 24B is written into the pixels, and in the pixels in the (M+1)th row, the reference voltage supplied from the signal line 24A is written into the pixels.

[0046] Furthermore, in the pixel on the Mth row, 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 13B, with the input path including the signal line 24B and the selection transistor 13B being electrically disconnected. In the pixel on the (M+1)th row, the signal voltage from the data output unit is written into the pixel via the input path including the signal line 24A and the selection transistor 13B, with the input path including the signal line 24B and the selection transistor 13B being electrically disconnected. During the (N+2)th frame period, the reference voltage and the signal voltage are written into the pixel via the same paths as in the Nth frame period.

[0047] In this embodiment, the input path through which the signal from the data signal output unit is written to the pixel differs for each frame period.

[0048] By changing the input path for each frame period, the brightness difference between pixels caused by the difference in the parasitic capacitance of the capacitive element is averaged over multiple frames. Therefore, the brightness difference is averaged over the time axis, and display unevenness can be suppressed for the entire display panel. Furthermore, even if the parasitic capacitance differs for each signal line, the brightness difference between pixels is averaged over multiple frames.

[0049] In this specification, the frame period refers to the period from the timing at which an initialization voltage Vref is written to a signal line in a pixel in a given row to the timing at which the initialization voltage Vref is next written to the pixel in that row.

[0050] Furthermore, when viewing pixels in an arbitrary column, the method of writing data signals may involve writing for each row, writing for a certain number of rows, etc., and after the last write in the direction in which the write progresses, the next write may not be performed on pixels in the same row. In such cases, the frame period refers to the period from timing A, at which the initialization voltage Vref is written to a pixel in an arbitrary row, to timing B. Timing B is after the timing at which the initialization voltage Vref would be written to the pixel next if writing had been performed sequentially on pixels in all rows, and is the timing at which the initialization voltage Vref is written to another row closest to that timing.

[0051] Next, a conventional example of a pixel circuit will be described with reference to Fig. 15. The difference from the pixel circuit of this embodiment is that there is one selection transistor 13 for one light-emitting element 11, and therefore there is one input path through which a signal from a data signal output unit is input to the light-emitting element 11.

[0052] 15, in the pixel circuits in the Mth row (M is an odd number), a signal line 24A is connected to the selection transistor 13, and in the pixel circuits in the (M+1)th row, a signal line 24B is connected to the selection transistor 13. In other words, a signal voltage is supplied from the signal line 24A to the pixels in the odd-numbered rows, and a signal voltage is supplied from the signal line 24B to the pixels in the even-numbered rows.

[0053] Figure 16 shows a conventional example of a driving method using the pixel circuit of Figure 15. To correct the threshold value of the drive transistor of each pixel, the switch circuits for each output terminal in the signal selection circuit 31 are turned on at the same time while a reference voltage (Vref) is being supplied as the data signal 32. This causes the reference voltage Vref to be written simultaneously to the signal lines 24A and 24B, after which the selection transistors 13A and 13B in the Mth and (M+1)th rows are turned on at the same time, thereby sampling the reference voltage and writing it into the pixel.

[0054] That is, the reference voltage supplied from signal line 24A is written into the pixel in the Mth row, and the reference voltage supplied from signal line 24B is written into the pixel in the M+1th row.

[0055] Thereafter, while a signal voltage (Vsig) (image signal) is being supplied to the image signal line 32, the signal voltage Vsig is written to the signal lines 24A and 24B by sequentially turning on the switch circuits in the corresponding signal selection circuits 31. Thereafter, the selection transistors 13A and 13B in the Mth and (M+1)th rows are turned on at the same time, thereby writing the signal voltage into the pixel.

[0056] That is, the signal voltage supplied from signal line 24A is written to the pixels in the Mth row, and the signal voltage supplied from signal line 24B is written to the pixels in the (M+1)th row. These operations are performed within one horizontal period, and the same circuit operations are repeated in the next and subsequent horizontal scanning periods. Furthermore, the same circuit operations are performed across all frame periods.

[0057] Because the signal lines 24A and 24B are positioned differently relative to other wiring and transistors, the wiring capacitances due to coupling with other wiring and transistors also differ between the signal lines 24A and 24B. Therefore, even when the same image signal is applied, there is a possibility that a difference in signal voltage will occur between the signal lines. In this case, the potential difference between the signal lines will cause a difference in brightness, which may result in uneven brightness between pixels due to the signal lines being written.

[0058] On the other hand, in the display device according to the embodiment, the input path from the data signal output unit to the light-emitting element 11 is switched for each pixel between the first frame period and the second frame period, which is different from the first frame period. Therefore, even if a difference in luminance occurs between pixels due to differences in the parasitic capacitance between the signal lines 24A and 24B, the relationship between the luminance difference between pixels due to the difference in parasitic capacitance is reversed between the first frame period and the second frame period. Therefore, when averaged over time, the luminance difference between pixels is reduced. This makes it possible to provide a display device with reduced luminance difference between pixels.

[0059] In this embodiment, the signal input paths are different between odd-numbered frame periods and even-numbered frame periods, but this is not limiting and any pixel may exist in which the signal line supplying the image signal changes for each frame period. For example, the pixel may be driven so that signals from the data output unit are input to the pixel via an input path that is different from that used for other frame periods only during a specific frame period. Furthermore, the pixel may be driven so that signals from the data output unit are written to the pixel via a different input path for each frame period only for a specific row.

[0060] In this embodiment, an example is shown in which there are two paths through which signals from the data signal output unit are written to pixels (light-emitting elements), but this is not limited to this as long as there are multiple different paths. For example, a configuration may be used in which three or more signal lines are provided for each column and three or more selection transistors are provided for each pixel.

[0061] In addition, when a signal from the data signal output unit is input to a pixel (light-emitting element 11), this does not only mean that a voltage corresponding to the signal is actually applied to the light-emitting element 11, but also that the signal is input to the gate of the drive transistor 12 so that it is applied to the light-emitting element 11.

[0062] In addition, although the present embodiment shows a case where the data signal output unit is the horizontal scanning circuit 2 arranged within the display device, the data signal output unit is not limited to this. For example, if the horizontal scanning circuit 2 is arranged outside the display device and a signal (signal voltage) is supplied via a pad, the data signal output unit may be a pad.

[0063] Furthermore, by changing the layout of the scan lines for each select transistor, the parasitic capacitance with the first capacitive element 16 changes, which can be used to reduce the signal voltage difference between each pixel. For example, the parasitic capacitance of the first capacitive element 16 differs depending on the position of the scan line layout of the select transistor 13. The signal input path from the data signal output unit to the pixel can be changed by turning on / off each select transistor 13, so it is possible to change the signal voltage written to the first capacitive element 16 so as to reduce the difference in parasitic capacitance of the first capacitive element 16.

[0064] That is, by reducing the signal voltage difference due to the wiring layout in addition to the driving method of this embodiment, it is possible to further reduce the luminance difference between pixels.

[0065] (Second embodiment) The pixel circuit of this embodiment is shown in Figure 5. What differs from the first embodiment is that in a certain row during one frame period, there are pixels that have different signal lines that supply image signals. That is, in a certain row in any one frame, there are pixels that have signal line 24A and pixels that have signal line 24B that supplies a signal voltage (image signal).

[0066] In the pixels in the Mth row and the (M+1)th row and the Lth column, a signal line 24A is connected to the source electrode of the selection transistor 13A, and a signal line 24B is connected to the source electrode of the selection transistor 13B. Meanwhile, in the pixels in the Mth row and the (M+1)th row and the (L+1)th column, a signal line 24B is connected to the source electrode of the selection transistor 13A, and a signal line 24A is connected to the source electrode of the selection transistor 13B.

[0067] Although a 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. Furthermore, if the parasitic capacitance of the signal line 24A in the Lth column is larger than that of the signal line 24B, the parasitic capacitance of the signal line 24A in the (L+1)th row is also larger than that of the signal line 24B.

[0068] By mixing pixels in the same row that have different signal lines supplying image signals in this way, the line-shaped luminance unevenness that occurs between rows is averaged for each of a plurality of columns, thereby suppressing display unevenness.

[0069] In this embodiment, the signal lines that supply image signals are different for odd-numbered columns and even-numbered columns, but this configuration is not limiting as long as it is possible to suppress display unevenness. For example, the signal lines that supply signals to pixels may be changed every several columns depending on the characteristics of each pixel and the wiring layout. Furthermore, columns that change the signal lines that supply signals to pixels may be arranged randomly in order to make display unevenness less noticeable.

[0070] (Third embodiment) FIG. 6 shows the pixel circuit of this embodiment.

[0071] The difference from the first embodiment is that the path along which a data signal is written to a pixel (light-emitting element) for each frame period is different for only pixels of a specific color.

[0072] Red (R) pixels are arranged in a stripe pattern on the Mth row, green (G) pixels on the M+1th row, and blue (B) pixels on the M+2th row, with red, green, and blue pixels arranged periodically every three rows. In the red (R) and green (G) pixels on the Mth and M+1th rows, a signal line 24A is connected to the source electrode of the selection transistor 13A, and a signal line 24B is connected to the source electrode of the selection transistor 13B. Meanwhile, in the blue (B) pixel on the M+2th row, only one selection transistor 13 is arranged, and a signal line 24C is connected to the source electrode of the selection transistor 13.

[0073] That is, in this embodiment, the light emitting elements 11 of some of the pixels have multiple paths through which signals output from the data signal output unit are input, while the light emitting elements 11 of another part of the pixels have one input path through which signals are output from the data signal output unit. Also, the pixels with two input paths emit different colors of light than the pixels with one input path.

[0074] Figure 7 shows a driving method of this embodiment using the pixel circuit of Figure 6. What differs from embodiment 1 is that only the (M+2)th row, which drives blue (B) pixels, always writes a reference voltage and a signal voltage into the pixel using the selection transistor 13. During one horizontal period, writing operations are performed simultaneously on the (M+1)th, (M+2)th, and (M+3)th rows, and similar circuit operations are repeated simultaneously for the three rows in the horizontal scanning periods from the (M+3)th row onwards.

[0075] In this way, display unevenness can be suppressed by prioritizing red (R) and green (G) pixels, which have high luminosity and tend to show brightness differences, and by changing the signal lines (input paths) that supply image signals for each frame period. Also, because only one selection transistor is placed per blue (B) pixel, the degree of freedom in pixel layout is improved, making it possible to miniaturize pixels and improve resolution.

[0076] (Fourth embodiment) FIG. 8 shows the pixel circuit of this embodiment.

[0077] The difference from the first embodiment is that one signal line is provided for each column. The source electrodes of the selection transistors 13A and 13B of each pixel are connected to the same signal line 24.

[0078] Even if each column has one signal line, by providing a plurality of selection transistors for each pixel, it is possible to provide a plurality of input paths for signals input from the data signal output section to the light emitting element 11.

[0079] Due to the layout of pixels, the layout of transistors other than the selection transistor and wiring may differ for each pixel, and the parasitic capacitance of the first capacitance element 16 that holds a signal may differ for each pixel. On the other hand, the display device of this embodiment has two input paths to the pixel (light-emitting element). Because the input paths are different, it is possible to change the signal voltage written to the first capacitance element 16 by using the difference in parasitic capacitance caused by the position of the selection transistor's scan line layout, etc. Therefore, by selecting an input path that reduces the difference in parasitic capacitance of the first capacitance element 16, it is possible to reduce the brightness difference between pixels.

[0080] Furthermore, in the display device of this embodiment, the luminance difference between pixels can be averaged over multiple frames by changing the selection transistor to which a signal is written for each frame period, which averages the luminance difference over time and reduces display unevenness across the entire display panel.

[0081] (Fifth embodiment) [Configuration of organic light-emitting element] The organic light-emitting element is provided by forming an anode, an organic compound layer, and a cathode on a substrate. A protective layer, a color filter, etc. may be provided on the cathode. When a color filter is provided, a planarizing layer may be provided between the protective layer and the color filter. The planarizing layer may be made of acrylic resin or the like.

[0082] [substrate] Examples of the substrate include quartz, glass, silicon wafer, resin, and metal. Furthermore, the substrate may be provided with switching elements such as transistors and wiring, and an insulating layer thereon. The insulating layer may be made of any material, as long as it can form contact holes to ensure electrical continuity between the anode 2 and the wiring and can ensure insulation from unconnected wiring. For example, resins such as polyimide, silicon oxide, silicon nitride, etc. can be used.

[0083] [electrode] A pair of electrodes can be used. The pair of electrodes may be an anode and a cathode. When an electric field is applied in the direction in which the organic light-emitting element emits light, the electrode with a higher potential is the anode, and the other is the cathode. It can also be said that the electrode that supplies holes to the light-emitting layer is the anode, and the electrode that supplies electrons is the cathode.

[0084] The material for the anode should have as high a work function as possible. For example, simple metals such as gold, platinum, silver, copper, nickel, palladium, cobalt, selenium, vanadium, and tungsten, mixtures containing these metals, and alloys combining these metals can be used. Metal oxides such as tin oxide, zinc oxide, indium oxide, indium tin oxide (ITO), and zinc indium oxide can also be used. Furthermore, conductive polymers such as polyaniline, polypyrrole, and polythiophene can also be used.

[0085] These electrode materials may be used alone or in combination of two or more. The anode may be composed of one layer or multiple layers.

[0086] When used as a reflective electrode, for example, chromium, aluminum, silver, titanium, tungsten, molybdenum, or alloys or laminates thereof can be used. When used as a transparent electrode, transparent conductive oxide layers such as indium tin oxide (ITO) and indium zinc oxide can be used, but are not limited to these. Photolithography techniques can be used to form the electrodes.

[0087] On the other hand, materials with a low work function are preferred for the cathode. Examples include alkali metals such as lithium, alkaline earth metals such as calcium, and metals such as aluminum, titanium, manganese, silver, lead, and chromium, as well as mixtures containing these metals. Alternatively, alloys combining these metals can be used. For example, 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. These electrode materials can be used alone or in combination. The cathode can have either a single-layer or multi-layer structure. Among these, silver is preferred, and a silver alloy is even more preferred to suppress silver aggregation. The alloy ratio is not critical as long as silver aggregation can be suppressed. For example, a 1:1 ratio is acceptable.

[0088] The cathode may be a top-emission element using an oxide conductive layer such as ITO, or a bottom-emission element using a reflective electrode such as aluminum (Al), and is not particularly limited. The method for forming the cathode is not particularly limited, but DC and AC sputtering methods are more preferred because they provide good film coverage and make it easier to reduce resistance.

[0089] [Protective layer] A protective layer may be provided on the cathode. For example, by adhering glass with a moisture absorbent on the cathode, it is possible to prevent water and other substances from penetrating the organic compound layer, thereby preventing display defects. In another embodiment, a passivation film such as silicon nitride may be provided on the cathode to prevent water and other substances from penetrating the organic EL layer. For example, after forming the cathode 7, the device may be transported to another chamber without breaking the vacuum, and a silicon nitride film with a thickness of 2 μm may be formed by CVD to serve as a protective layer. A protective layer may also be provided using atomic layer deposition (ALD) after the CVD film formation.

[0090] [Color Filter] A color filter may be provided on the protective layer. For example, a color filter taking into consideration the size of the organic light-emitting element may be provided on a separate substrate and then bonded to the substrate on which the organic light-emitting element is provided, or a color filter may be patterned on the protective layer described above using photolithography technology. The color filter may be made of a polymer.

[0091] [Planarization layer] A planarizing layer may be provided between the color filter and the protective layer. The planarizing layer may be made of an organic compound, and may be either a low molecular weight or a high molecular weight, but is preferably a high molecular weight.

[0092] The planarizing layer may be provided above or below the color filter, and may be made of the same or different materials, such as polyvinyl carbazole resin, polycarbonate resin, polyester resin, ABS resin, acrylic resin, polyimide resin, phenol resin, epoxy resin, silicone resin, and urea resin.

[0093] [Competitive board] A counter substrate may be provided on the planarization layer. The counter substrate is called a counter substrate because it is provided at a position corresponding to the aforementioned substrate. The counter substrate may be made of the same material as the aforementioned substrate.

[0094] [Organic layer] The organic compound layers (hole injection layer, hole transport layer, electron blocking layer, light emitting layer, hole blocking layer, electron transport layer, electron injection layer, etc.) constituting the organic light emitting device according to one embodiment of the present invention are formed by the method shown below.

[0095] The organic compound layer constituting the organic light-emitting device according to one embodiment of the present invention can be formed by dry processes such as vacuum deposition, ionization deposition, sputtering, plasma, etc. Alternatively to the dry process, a wet process can be used in which the compound is dissolved in an appropriate solvent and a layer is formed by a known coating method (for example, spin coating, dipping, casting, LB method, inkjet method, etc.).

[0096] Here, when a layer is formed by a vacuum deposition method or a solution coating method, crystallization is unlikely to occur and the layer has excellent stability over time. When a film is formed by a coating method, the film can be formed by combining with an appropriate binder resin.

[0097] Examples of the binder resin include polyvinyl carbazole resin, polycarbonate resin, polyester resin, ABS resin, acrylic resin, polyimide resin, phenol resin, epoxy resin, silicone resin, urea resin, etc. The above are examples, and the binder resin is not limited to these.

[0098] These binder resins may be used singly or in combination as homopolymers or copolymers, and may further contain known additives such as plasticizers, antioxidants, and ultraviolet absorbers, if necessary.

[0099] [Display device usage] The display devices according to the first to fourth embodiments can be used as display units of various electronic devices, such as digital cameras, video cameras, head-mounted displays (goggle-type displays), game consoles, car navigation systems, personal computers, personal digital assistants, electronic books, and television sets. Specific examples are described below with reference to the accompanying drawings.

[0100] 9 shows an example of application of the display devices according to the first to fourth embodiments. The display devices according to any one of the first to fourth embodiments can be applied to information display devices such as a camera viewfinder, a head-mounted display, and smart glasses.

[0101] 9(a) is a schematic diagram of an example of a display device used as a viewfinder for an imaging device such as a camera. Display light 217 and infrared light 218 are emitted from the display device, and the display light and infrared light pass through the same optical member 222 to reach the user's eyeball 6. The infrared light reflected by the user's eyeball 216 is converted into electrical information by an imaging device 223 having an imaging element, and the line of sight is detected based on that information. Instead of providing an imaging device, an imaging element may be provided on an insulating layer of the display device 1, and the display device may be used as a display imaging device.

[0102] 9(b) shows an example of an imaging device such as a camera. The imaging device 224 has a viewfinder 225, a display 226, an operation unit 227, and a housing 228. The display device in FIG. 9(a) is provided in the viewfinder 225.

[0103] 9(a) shows an example in which the display light 217 and the infrared light 218 pass through the same optical member 222, but separate optical members may be provided for the display light and the infrared light. Also, instead of providing an imaging device, an imaging element may be provided on the substrate of the display device 1 and used as a display imaging device. The detected line-of-sight information can be used to control the display device and various devices connected to the display device, such as for camera focus control, display image resolution control, and as a substitute for button operation.

[0104] A display device according to an embodiment of the present invention may have an imaging device having a light receiving element, and may control the image displayed on the display device based on information about the user's line of sight from the imaging device.

[0105] 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 determined by an external control device and received. 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.

[0106] 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.

[0107] 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.

[0108] When display control is performed based on visual recognition detection, the smart glasses can be preferably applied to smart glasses that further include an imaging device for capturing images of the outside world. The smart glasses can display captured external information in real time.

[0109] Alternatively, a first imaging device may have a light receiving element for receiving infrared light, and a second imaging device for capturing images of the outside world, which has a light receiving element different from that of the first imaging device. The imaging resolution of the second imaging device may be controlled based on the line-of-sight information of the user of the first imaging device. By lowering the imaging resolution of other areas compared to a prioritized area, the amount of information can be reduced. This reduces power consumption and display delay. The prioritized area may be the first imaging area, and an area with a lower priority than the first imaging area may be the second imaging area.

[0110] FIG. 9(c) is a schematic diagram showing an example of smart glasses. An image capturing and display device 229, typified by smart glasses, has a control unit 230, a transparent display unit 231, and an external image capturing unit (not shown). When applied to smart glasses, both the display device and the external image capturing device can be controlled based on detected gaze information, thereby reducing power consumption and display delays. For example, by lowering the display and image resolution of areas of the display area other than the area the user is gazing at, the amount of information in both the image capturing and display can be reduced, thereby reducing power consumption and display delays.

[0111] The display devices according to the first to fourth embodiments can be used as components of the following display devices and lighting devices, and can also be used as an exposure light source for an electrophotographic image forming device, a backlight for a liquid crystal display device, a light-emitting device having a white light source and a color filter, etc.

[0112] The display device may be an image information processing device that has an image input unit that inputs image information from an area CCD, a linear CCD, a memory card, etc., has an information processing unit that processes the input information, and displays the input image on the display unit.

[0113] The display unit of the imaging device or inkjet printer may have a touch panel function. The driving method of this touch panel function may be an infrared method, a capacitance method, a resistive film method, or an electromagnetic induction method, and is not particularly limited. The display device may also be used in the display unit of a multifunction printer.

[0114] Next, the display device according to this embodiment will be described with reference to the drawings. Fig. 10 is a cross-sectional view showing an example of a display device having an organic light-emitting element and a TFT element connected to the organic light-emitting element. The TFT element is an example of an active element.

[0115] 10 includes a substrate 111 made of glass or the like and a moisture-proof film 112 formed thereon to protect the TFT elements or organic compound layers. Reference numeral 113 denotes a metal gate electrode 113. Reference numeral 114 denotes a gate insulating film 114, and reference numeral 115 denotes a semiconductor layer.

[0116] The TFT element 118 has a semiconductor layer 115, a drain electrode 116, and a source electrode 117. An insulating film 119 is provided on the top of the TFT element 118. An anode 121 constituting the organic light-emitting element and the source electrode 117 are connected via a contact hole 120.

[0117] The electrical connection method between the electrodes (anode, cathode) included in the organic light-emitting element and the electrodes (source electrode, drain electrode) included in the TFT is not limited to the embodiment shown in Fig. 10. In other words, it is sufficient that either the anode or the cathode is electrically connected to either the source electrode or the drain electrode of the TFT element.

[0118] 10 shows the organic compound layer as a single layer, the organic compound layer 122 may be a multi-layer structure. A first protective layer 124 and a second protective layer 125 are provided on the cathode 123 to suppress deterioration of the organic light-emitting element.

[0119] In the display device 110 of FIG. 10, transistors are used as switching elements, but MIM elements may be used instead as switching elements.

[0120] 10 is not limited to transistors using a single-crystal silicon wafer, but may be thin-film transistors having an active layer on an insulating surface of a substrate. Examples of active layers include single-crystal silicon, amorphous silicon, microcrystalline silicon, and other non-single-crystal silicon, as well as non-single-crystal oxide semiconductors such as indium zinc oxide and indium gallium zinc oxide. Thin-film transistors are also called TFT elements.

[0121] The transistors included in the display device 110 of Fig. 10 may be formed within a substrate such as a Si substrate. Here, "formed within a substrate" means that the substrate itself, such as a Si substrate, is processed to form the transistors. In other words, having a transistor within a substrate can be seen as the substrate and the transistor being integrally formed.

[0122] The organic light-emitting element according to this embodiment has its emission brightness controlled by a TFT, which is an example of a switching element. By providing multiple organic light-emitting elements on a surface, an image can be displayed based on the emission brightness of each element. The switching element according to this embodiment is not limited to a TFT, but may also be a transistor formed from low-temperature polysilicon or an active matrix driver formed on a substrate such as a Si substrate. "On the substrate" can also be referred to as "inside the substrate." Whether to provide a transistor within the substrate or to use a TFT is determined by the size of the display unit. For example, for a display size of about 0.5 inches, it is preferable to provide the organic light-emitting element on a Si substrate.

[0123] 11 is a schematic diagram illustrating 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 by flexible printed circuits FPCs 1002 and 1004. Transistors are printed on the circuit board 1007. The battery 1008 may not be provided if the display device is not a portable device, and may be provided in a different position even if the display device is a portable device.

[0124] The display device according to this embodiment may be used as a display unit of a photoelectric conversion device having an optical unit with multiple lenses and an image sensor that receives light that has passed through the optical unit. The photoelectric conversion device may have a display unit that displays information acquired by the image sensor. Alternatively, information may be acquired using information acquired by the image sensor, and the display unit may display information different from that information. The display unit may be a display unit exposed to the outside of the photoelectric conversion device, or a display unit disposed within the viewfinder. The photoelectric conversion device may be a digital camera or a digital video camera.

[0125] 12(a) is a schematic diagram illustrating an example of a photoelectric conversion device according to this embodiment. The photoelectric conversion device 1100 may include a viewfinder 1101, a rear display 1102, an operation unit 1103, and a housing 1104. The viewfinder 1101 may include a display device according to any one of the first to fourth embodiments. In this case, the display device may display not only an image to be captured, but also environmental information, imaging instructions, and the like. The environmental information may include the intensity of external light, the direction of external light, the speed at which the subject is moving, the possibility that the subject will be blocked by an obstruction, and the like.

[0126] Since the optimum timing for capturing an image is very short, it is better to display information as soon as possible. Therefore, it is preferable to use a display device using the organic light-emitting element of the present invention. This is because the organic light-emitting element has a fast response speed. A display device using an organic light-emitting element can be used more preferably than a liquid crystal display device, which requires a high display speed.

[0127] The photoelectric conversion device 1100 has an optical section (not shown). The optical section has multiple lenses, which form an image on an image sensor 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.

[0128] The display device according to this embodiment may have color filters having red, green, and blue colors, which may be arranged in a delta arrangement.

[0129] The display device according to the present embodiment may be used as 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 a mobile phone such as a smartphone, a tablet, and the head-mounted display described above.

[0130] FIG. 12(b) is a schematic diagram showing an example of an electronic device according to this embodiment. The electronic device 1200 has a display unit 1201, an operation unit 1202, and a housing 1203. The housing 1203 may have 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 perform operations such as unlocking. An electronic device having a communication unit can also be called a communication device. The display unit may have the display device of any of the first to fourth embodiments.

[0131] 13A and 13B are schematic diagrams illustrating an example of a display device according to this embodiment. Fig. 13A shows 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 unit 1302 may be any of the display devices according to the first to fourth embodiments.

[0132] It has a frame 1301 and a base 1303 that supports a display unit 1302. The base 1303 is not limited to the form shown in Fig. 13(a). The bottom side of the frame 1301 may also serve as the base.

[0133] 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.

[0134] FIG. 13(b) is a schematic diagram illustrating another example of a display device according to this embodiment. The display device 1310 in FIG. 13(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 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, seamless display unit. The first display unit 1311 and the second display unit 1312 can be separated by the bending point. 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.

[0135] 14(a) is a schematic diagram showing an example of an illumination device according to this embodiment. The illumination 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. The light source may include a display device according to any one of the first to fourth embodiments. In this case, image data input to each pixel may be a signal corresponding to the same luminance, rather than forming an image when displayed.

[0136] The optical filter may be a filter that improves the color rendering of the light source. The light diffusion section can effectively diffuse the light from the light source, such as for lighting, and deliver the light over a wide area. The optical filter and light diffusion section may be transparent and provided on the light output side of the lighting. If necessary, a cover may be provided on the outermost part.

[0137] The lighting device is, for example, a device for illuminating a room. The lighting device may emit white, daylight white, or any other color from blue to red. It may have a dimming circuit for dimming these colors. The lighting device may have the organic light-emitting element of the present invention and a power supply circuit connected thereto. The power supply circuit is a circuit for converting AC voltage to DC voltage. Furthermore, white has a color temperature of 4200K, and daylight white has a color temperature of 5000K. The lighting device may have a color filter.

[0138] The lighting device according to this embodiment may also include a heat dissipation unit, which dissipates heat from within the device to the outside, and may be made of a material such as a metal with a high specific heat capacity or liquid silicon.

[0139] 14(b) is a schematic diagram of an automobile, which is an example of a moving body according to this embodiment. The automobile has tail lamps, which are an example of lighting fixtures. The automobile 1500 has tail lamps 1501, and may be configured to turn on the tail lamps when braking or the like is performed.

[0140] The tail lamp 1501 may have a display device according to any one of the first to fourth embodiments as a lighting device. The tail lamp may have a protective member for protecting the organic EL element. The protective member may be made of any material as long as it has a certain degree of strength and is transparent, but it is preferable that the protective member be made of polycarbonate or the like. Polycarbonate may be mixed with a furandicarboxylic acid derivative, an acrylonitrile derivative, or the like.

[0141] An automobile 1500 may have a body 1503 and a window 1502 attached thereto. The window may be a transparent display as long as it is not a window for checking the front and rear of the automobile. The transparent display may have a display device according to any one of the first to fourth embodiments. In this case, constituent materials of the electrodes and the like of the organic light-emitting element are made of transparent materials.

[0142] The moving body according to the present embodiment may be a ship, an aircraft, a drone, or the like. The moving body may have a body and a lighting device provided on the body. The lighting device may emit light to indicate the position of the body. The lighting device has the display device according to any one of the first to fourth embodiments as an illumination device.

[0143] As described above, by using the display device according to any one of the first to fourth embodiments, it is possible to provide a stable display with good image quality even when displayed for a long period of time. [Explanation of symbols]

[0144] 2 Horizontal drive circuit 11 Light-emitting element 21 Signal line

Claims

1. A 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 section and different from the first signal line; A first light-emitting element; a first transistor including a gate, the source or drain of which is connected to the first light emitting element; a second transistor connected between the first signal line and the gate; a third transistor connected between the second signal line and the gate, Both the first signal line and the second signal line are configured to be able to receive an image signal, On a given line: during a first frame period, in a state in which the image signal is input to the first signal line, the second transistor is turned on, and the third transistor is maintained off throughout the entire first frame period; a second frame period following the first frame period, during which the third transistor is turned on while the image signal is being input to the second signal line, and the second transistor is maintained off throughout the entire second frame period.

2. 2. The display device according to claim 1, wherein a parasitic capacitance of the first signal line is different from a parasitic capacitance of the second signal line.

3. A third signal line connected to the data signal output unit; A second light-emitting element; a fourth transistor including a gate and having either a source or a drain connected to the second light emitting element; a fifth transistor connected between the third signal line and the gate of the second light-emitting element, 3. The display device according to claim 1, wherein a signal is input to the gate of the second light-emitting element only from the third signal line.

4. The display device according to claim 3 , wherein the first light emitting element and the second light emitting element emit light of different colors.

5. The display device according to claim 4 , wherein the second light emitting element is a blue light emitting element.

6. An imaging element; The display device according to any one of claims 1 to 5, An information display device that controls a display image on the display device based on user's line of sight information from the imaging element.

7. an optical unit having a plurality of lenses, an image sensor that receives light that has passed through the optical unit, and a display unit that displays an image captured by the image sensor; A photoelectric conversion device, comprising: a display device according to claim 1 ;

8. 6. 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.

Images