Display device

Abstract

A display device (1) comprises a display unit (3) and a power supply unit (2). The display unit (3) has a light-emitting element group that includes a common electrode (4), an auxiliary wiring group (10) that is connected to the power supply unit (2), and a contact hole group (15) that electrically connects the common electrode (4) and the auxiliary wiring group (10). The display unit (3) includes a first portion (13) that includes a part of the contact hole group (15), and a second portion (14) that includes another part of the contact hole group (15) and has the same area as the first portion (13) in a plan view. As compared with the first portion (13), the second portion (14) has a greater distance from the power supply unit (2), and a larger number of contact holes (24) included therein.

Description

Display device

[0001] The present disclosure relates to a display device.

[0002] In a display of self-emitting elements, for the light-emitting elements arranged in a matrix, an image is displayed (light-emitted) by a current control circuit formed for each pixel and a current flowing between common (cathode, etc.) electrodes spanning the entire screen.

[0003] When light-emitting, a voltage drop occurs due to the resistance of the common electrode from the power input part to the light-emitting element. However, since the resistance of the common electrode varies depending on the position within the screen for each light-emitting element, a difference in voltage drop occurs within the screen, causing a change in the current supplied from the pixel's current control circuit and resulting in problems such as display unevenness.

[0004] In order to suppress such a voltage drop, it is necessary to lower the resistance of the common electrode. However, the common electrode has a large area spanning the display screen, and often a high-resistance transparent conductive film, metal thin film, etc. is used to transmit light as a display device, resulting in a high resistance. In response to this, it is known to use a means of reducing the resistance by forming and connecting an auxiliary wiring such as metal to the common electrode (Patent Documents 1 - 3).

[0005] Japanese Patent Application Laid-Open No. 2003 - 123988, Japanese Patent Application Laid-Open No. 2009 - 199868, Japanese Patent Application Laid-Open No. 2015 - 69830

[0006] However, in order to form auxiliary wiring, connection points, etc. within the screen to reduce the resistance, it is necessary to reduce the area for forming the light-emitting elements and pixel circuits, which becomes a factor of adverse effects such as a decrease in luminance. Thus, even if auxiliary wiring is added, it is a difficult problem to sufficiently reduce the voltage drop and suppress display unevenness.

[0007] A display device according to one aspect of the present disclosure comprises a display unit and a power supply unit, wherein the display unit has a group of light-emitting elements including a common electrode, a group of auxiliary wiring connected to the power supply unit, and a group of contact holes electrically connecting the common electrode and the group of auxiliary wiring, wherein the display unit includes a first portion including a part of the group of contact holes, and a second portion including another part of the group of contact holes, the area of ​​which in plan view is equal to that of the first portion, and the second portion is located further from the power supply unit and contains a larger number of contact holes compared to the first portion.

[0008] A display device according to one aspect of the present disclosure comprises a first power supply unit and a second power supply unit, and a display unit located between the first and second power supply units, wherein the display unit has a group of light-emitting elements including a common electrode, a group of auxiliary wiring connected to the first and second power supply units, and a group of contact holes electrically connecting the common electrode and the group of auxiliary wiring units, wherein the display unit includes a first portion including a part of the group of contact holes, and a second portion including another part of the group of contact holes, the area of ​​which in plan view is equal to that of the first portion, the first and second portions are located closer to the first power supply unit than the center of the display unit, and the second portion is located further away from the first power supply unit and contains a larger number of contact holes compared to the first portion.

[0009] According to one aspect of this disclosure, the resistance reduction effect of auxiliary wiring can be set to be approximately uniform across the entire screen, thereby suppressing the occurrence of display unevenness within the screen.

[0010] This is a cross-sectional view of the display unit provided in the display device according to Embodiment 1. This is a schematic plan view of the above display device. This is another schematic plan view of the above display device. This is a graph showing the relationship between RC / RD and display unevenness level in the above display device. This is a graph showing the relationship between the difference (%) in the number of contact holes and the display unevenness level in the above display device. This is a schematic plan view for explaining the relationship between the screen position and voltage drop of the above display device. This is a graph showing the relationship between the screen position and voltage drop of the above display device. This is a schematic plan view of the display device according to a comparative example. This is a graph showing the relationship between the screen position and voltage drop of the above display device. This is a schematic plan view of the display device according to Embodiment 2. This is another schematic plan view of the above display device. This is a schematic plan view for explaining the relationship between the screen position and voltage drop of the above display device. This is a graph showing the relationship between the screen position and voltage drop of the above display device. This is a schematic plan view of the display device according to another comparative example. This is a graph showing the relationship between the screen position and voltage drop of the display device according to another comparative example.

[0011] (Embodiment 1) Figure 1 is a cross-sectional view of the display unit 3 provided in the display device 1 according to Embodiment 1. Figures 2 and 3 are schematic plan views of the display device 1.

[0012] As shown in Figures 2 and 3, the display device 1 comprises a display unit 3 and a power supply unit 2. As shown in Figures 1 to 3, the display unit 3 has a light-emitting element layer 8 including a common electrode 4, a group of N auxiliary wirings SG connected to the power supply unit 2, and a group of contact holes CG consisting of a plurality of contact holes CH electrically connecting the common electrode 4 and the group of auxiliary wirings SG. As shown in Figure 1, the display unit 3 comprises a light-emitting element layer 8 including a group of light-emitting elements 5 arranged in a matrix, and a circuit board 9 including the group of auxiliary wirings SG and a group of pixel circuits 19. The common electrode 4 is arranged in common across the entire screen for the plurality of light-emitting elements 5 arranged in a matrix.

[0013] In this manner, the common electrode 4 of the light-emitting element layer 8 receives the power supply voltage from the power supply unit 2 via the auxiliary wiring group SG and the contact hole group CG.

[0014] As shown in Figure 1, the light-emitting layer 8 includes a plurality of pixel electrodes 6 corresponding to a plurality of light-emitting elements 5, and an organic insulating film 7 covering the edges of each of the plurality of pixel electrodes 6. A plurality of contact holes CH included in the contact hole group CG penetrate the organic insulating film 7. The plurality of pixel electrodes 6 may be a plurality of anodes. The light-emitting layer 8 includes an organic light-emitting diode (OLED) or a quantum dot light-emitting diode (QLED). The common electrode 4 is a translucent metal film or a translucent metal oxide film. The pixel circuit 19 is provided for each of the plurality of light-emitting elements 5 arranged in a matrix, and as shown in Figure 1, includes a source electrode 21 and a drain electrode 22 formed in the same layer as the auxiliary wiring group SG, a gate electrode 23, and a semiconductor layer 20 connected to the source electrode 21 and the drain electrode 22. The drain electrode 22 is connected to the pixel electrode 6.

[0015] As shown in Figures 2 and 3, the common electrode 4 is arranged across the entire display screen and receives power voltage from the power supply unit 2 located outside the display unit 3.

[0016] As shown in Figure 2, the display unit 3 includes a first portion J1 which includes a portion of the multiple contact holes CH included in the contact hole group CG, and a second portion J2 which includes another portion of the multiple contact holes CH included in the contact hole group CG and whose area in plan view is equal to that of the first portion J1. As shown in Figure 2, the second portion J2 is located further away from the power supply unit 2 and contains a larger number of contact holes CH compared to the first portion J1. In Figure 2, the contact holes CH are represented by black, vertically elongated rectangles. The first portion J1 and the second portion J2 are horizontally elongated portions that cross the multiple auxiliary wirings included in the auxiliary wiring group SG.

[0017] In the example shown in Figure 2, the number of contact holes CH contained within the second region J2 is 8, which is more than the number of contact holes CH contained within the first region J1, which is 3.

[0018] Thus, the number of contact holes CH that electrically connect the common electrode 4 and the auxiliary wiring group SG is arranged such that the number of contact holes CH increases as the distance from the power supply unit 2 increases.

[0019] Multiple auxiliary wirings included in the auxiliary wiring group SG may be arranged at each pitch of multiple pixel circuits 19, but may also be arranged independently of the pitch of the pixel circuits 19, or one wire may be arranged for each set of R pixels, G pixels, and B pixels, or these arrangements may be repeated.

[0020] The common electrode 4 may be a cathode shared by multiple light-emitting elements 5 of the light-emitting element group. As shown in Figure 3, the length of each auxiliary wiring in the auxiliary wiring group SG is LS, the length between the center of the first part J1 and the power supply unit 2 is L1, the length between the center of the second part J2 and the power supply unit 2 is L2, the number of contact holes CH in the first part J1 is N1, the number of contact holes CH in the second part J2 is N2, k > 0 and 0.8 ≤ α ≤ 1.2, and the following equations hold: N1 = k × L1 / LS, N2 = α × k × L2 / LS. The configuration shown in Figure 2 is an example where N1 = 3 and N2 = 8. Figure 4 is a graph showing the relationship between RC / RD and display unevenness level in the display device 1. The horizontal axis shows the ratio RC / RD, where RD is the ratio of the distance L2 between the power supply unit 2 and the second part J2 to the distance L1 between the power supply unit 2 and the first part J1, and RC is the ratio of the number of contact holes in the second part J2 to the number of contact holes in the first part J1. The vertical axis shows the display unevenness level of the display device 1. The ratio RC / RD corresponds to α in the above formula N2 = α × k × L2 / LS. From the graph in Figure 4, it can be seen that when the ratio RC / RD exceeds 1.2 or falls below 0.8, the display unevenness level exceeds 3 and becomes 4, and the unevenness becomes clearly recognizable. This difference in α corresponds to the difference that occurs in the range of 0.8 ≤ α ≤ 1.2.

[0021] As shown in Figure 2, the auxiliary wiring group SG includes a first auxiliary wiring 11 that intersects with the first part J1 and a second auxiliary wiring 12 that intersects with the second part J2. The number of contact holes CH connected to the first auxiliary wiring 11 may be equal to the number of contact holes CH connected to the second auxiliary wiring 12. For example, in the example shown in Figure 2, there are 6 contact holes CH connected to the first auxiliary wiring 11 and 6 contact holes CH connected to the second auxiliary wiring 12, so the numbers are equal.

[0022] In the auxiliary wiring group SG, the maximum number of contact holes CH per auxiliary wiring is NA, and the minimum number is NB, where 0 ≤ (NA - NB) / NA ≤ 0.2. For example, in the example shown in Figure 2, the maximum number of contact holes CH per auxiliary wiring is NA = 6, and the minimum value is NB = 5. Therefore, (NA - NB) / NA = 1 / 6 ≈ 0.167, which satisfies the above condition. Figure 5 is a graph showing the relationship between the difference (%) in the number of contact holes in the display device 1 and the display unevenness level. The horizontal axis represents the ratio (difference) of the maximum number NA and the minimum value NB of the number of contact holes CH per auxiliary wiring, expressed in %). The vertical axis represents the display unevenness level of the display device 1. As shown in the graph of Figure 5, it can be seen that when the ratio of the maximum value NA to the minimum value NB exceeds 20%, the display unevenness can be clearly recognized.

[0023] The number of contact holes CH per auxiliary wire is preferably as similar as possible across multiple auxiliary wires included in the auxiliary wire group SG.

[0024] Within the display unit 3, multiple auxiliary wires included in the auxiliary wiring group SG may be electrically connected to each other. Let m and M be integers of 2 or more such that m < M. The first part J1 intersects with M auxiliary wires extending in the first direction shown in Figure 2. The M auxiliary wires include M connectable positions arranged in a second direction perpendicular to the first direction shown in Figure 2. Let m be the number of contact holes among the M connectable positions. The number of connectable positions that are not contact holes (non-connected positions BC) located between two adjacent contact holes in the second direction is an integer less than or equal to the number obtained by rounding up M / m and subtracting 1. For example, in the example shown in Figure 2, the first part J1 intersects with 10 auxiliary wires shown in Figure 2. The 10 auxiliary wires include 10 connectable positions arranged in the second direction. That is, M = 10. Let m be the number of contact holes CH among the 10 connectable positions. The number of connectable positions that are not designated as contact holes (non-connected positions BC) located between two adjacent contact holes CH in the second direction is an integer less than or equal to the number obtained by subtracting 1 from the number obtained by rounding up the decimal part of M / m.

[0025] For example, in Figure 2, the number of contact holes CH in the second row from the bottom is m = 2. The number of unconnected positions BC located between two adjacent contact holes CH in the second direction is at most 4, and is less than or equal to an integer 4 obtained by subtracting 1 from M / m = 10 / 2 = 5, thus satisfying the above condition. This condition means that it is important that the multiple contact holes CH are not arranged regularly, but are distributed.

[0026] Figure 6 is a schematic plan view illustrating the relationship between the screen position and voltage drop of the display device 1. Figure 7 is a graph showing the relationship between the screen position and voltage drop of the display device 1. Figure 8 is a schematic plan view of a display device according to a comparative example. Figure 9 is a graph showing the relationship between the screen position and voltage drop of a display device according to a comparative example.

[0027] The horizontal axis of the graphs in Figures 7 and 9 indicates screen positions 1-10 along the input direction of the auxiliary wiring shown in Figures 6 and 8. These screen positions correspond to the connection points between the auxiliary wiring and the common electrode 4 via the contact hole CH. The vertical axis indicates the voltage drop value within the screen caused by the auxiliary wiring.

[0028] As shown in Figure 8, in a comparative example display device in which multiple contact holes CH are arranged such that the number of contact holes CH remains constant regardless of the distance from the power supply unit 2, as shown by line C1 in Figure 9, the voltage drop within the screen due to auxiliary wiring increases as the distance from the power supply unit 2 to the screen position increases. Line C2 shows the voltage drop within the screen when auxiliary wiring is not provided.

[0029] In contrast, in a display device 1 where multiple contact holes CH are arranged such that the number of contact holes CH increases as the distance from the power supply unit 2 increases, as shown by line C3 in Figure 7, the voltage drop within the screen due to the auxiliary wiring is made uniform along the screen position in the input direction of the auxiliary wiring.

[0030] (Embodiment 2) Figure 10 is a schematic plan view of the display device 1A according to Embodiment 2. Figure 11 is another schematic plan view of the display device 1A. Components similar to those described above are denoted by the same reference numerals, and their detailed descriptions are not repeated.

[0031] As shown in Figures 10 and 11, the display device 1A comprises a first power supply unit 2A and a second power supply unit 2B, and a display unit 3 located between the first and second power supply units 2A and 2B. The display unit 3 has a light-emitting layer 8 including a common electrode 4, a group of N auxiliary wirings SG connected to the first power supply unit 2A and the second power supply unit 2B, and a group of contact holes CG electrically connecting the common electrode 4 and the group of auxiliary wirings SG. As shown in Figure 10, the display unit 3 includes a first part J1 including a part of the group of contact holes CG, and a second part J2 including another part of the group of contact holes CG, the second part having the same area as the first part J1 in plan view. The first and second parts J1 and J2 are located closer to the first power supply unit 2A than the center of the display unit 3.

[0032] Compared to the first part J1, the second part J2 is located further away from the first power supply unit 2A and contains a larger number of contact holes CH. In the example shown in Figure 10, the second part J2 contains 9 contact holes CH, which is more than the 6 contact holes CH contained in the first part J1.

[0033] The common electrode 4 may be a cathode shared by multiple light-emitting elements 5 of the light-emitting element group. Let LS be the length of each auxiliary wiring in the auxiliary wiring group SG, L1 be the length between the center of the first part J1 and the first power supply unit 2A, L2 be the length between the center of the second part J2 and the first power supply unit 2A, N1 be the number of contact holes CH in the first part J1, and N2 be the number of contact holes CH in the second part J2, where k > 0 and 0.8 ≤ α ≤ 1.2, then N1 = k × {(L1 / LS) - (L1 / LS)} ２}, and N2 = α × k × {(L2 / LS) - (L2 / LS)} ２ The following equation holds true. In the example shown in Figure 10, N1 = 6 and N2 = 9 are shown.

[0034] As shown in Figure 10, the display unit 3 is located closer to the second power supply unit 2B than the center of the display unit 3 and includes a third part J3 and a fourth part J4 that have the same area in a plan view. The fourth part J4 is located further away from the second power supply unit 2B than the third part J3 and contains a larger number of contact holes CH. In the example shown in Figure 10, the fourth part J4 contains 9 contact holes CH, which is more than the 6 contact holes CH contained in the third part J3.

[0035] Let LS be the length of each auxiliary wire in the auxiliary wiring group SG, L3 be the length between the center of the third section J3 and the second power supply unit 2B, L4 be the length between the center of the fourth section J4 and the second power supply unit 2B, N3 be the number of contact holes CH in the third section J3, and N4 be the number of contact holes CH in the fourth section J4, where k > 0 and 0.8 ≤ α ≤ 1.2. Then N3 = k × {(L3 / LS) - (L3 / LS)} ２}, and N4 = α × k × {(L4 / LS) - (L4 / LS)} ２The following holds true. The auxiliary wiring group SG includes a first auxiliary wiring 11 that intersects with the first part J1 and a second auxiliary wiring 12 that intersects with the second part J2. The number of contact holes CH connected to the first auxiliary wiring 11 and the number of contact holes CH connected to the second auxiliary wiring 12 may be equal. For example, in the example shown in Figure 10, the number of contact holes CH connected to the first auxiliary wiring 11 is 6, and the number of contact holes CH connected to the second auxiliary wiring 12 is 6, so the numbers are equal.

[0036] In the auxiliary wiring group SG, the maximum number of contact holes per auxiliary wiring is NA, and the minimum is NB. The condition is 0 ≤ (NA - NB) / NA ≤ 0.2. For example, in the example shown in Figure 10, the maximum number of contact holes CH per auxiliary wiring is NA = 7, and the minimum is NB = 6. Therefore, (NA - NB) / NA = 1 / 7 = 0.14, which satisfies the above condition.

[0037] Within the display unit 3, multiple auxiliary wires included in the auxiliary wiring group SG may be electrically connected to each other. Let m and M be integers of 2 or more such that m < M. The first part J1 intersects with M auxiliary wires extending in the first direction shown in Figure 10. The M auxiliary wires include M connectable positions arranged in the second direction shown in Figure 10. Let m be the number of contact holes among the M connectable positions. The number of connectable positions that are not contact holes (non-connected positions BC) located between two adjacent contact holes in the second direction is an integer less than or equal to the number obtained by rounding up M / m and subtracting 1. For example, in the example shown in Figure 10, the first part J1 intersects with 10 auxiliary wires shown in Figure 10. The 10 auxiliary wires include 10 connectable positions arranged in the second direction. That is, M = 10. Let m be the number of contact holes CH among the 10 connectable positions. The number of connectable positions that are not designated as contact holes (non-connected positions BC) located between two adjacent contact holes CH in the second direction is an integer less than or equal to the number obtained by subtracting 1 from the number obtained by rounding up the decimal part of M / m.

[0038] For example, in Figure 10, the number of contact holes CH in the second row from the bottom is m = 6. The number of unconnected positions BC located between two adjacent contact holes CH in the second direction is at most 1. For example, the number of unconnected positions BC located between the second contact hole CH from the left and the fourth contact hole CH from the left, which are adjacent in the second direction, is 1. M / m = 10 / 6 ≈ 1.67, and rounding up the decimal part gives 2, and subtracting 1 gives an integer of 1, so the above condition is satisfied. Figure 12 is a schematic plan view to explain the relationship between the screen position and voltage drop of the display device 1A. Figure 13 is a graph showing the relationship between the screen position and voltage drop of the display device 1A. Figure 14 is a schematic plan view of a display device according to another comparative example. Figure 15 is a graph showing the relationship between the screen position and voltage drop of a display device according to another comparative example. The horizontal axis of the graphs in Figures 13 and 15 shows the screen positions 1-9 along the input direction of the auxiliary wiring shown in Figures 12 and 14. As shown in Figure 14, in a display device relating to another comparative example in which multiple contact holes CH are arranged such that the number of contact holes CH remains constant regardless of the distance from the power supply units 2A and 2B, as shown by line C4 in Figure 15, the voltage drop in the screen due to auxiliary wiring increases as the distance from the power supply units 2A and 2B to the screen position increases. Line C5 shows the voltage drop in the screen when auxiliary wiring is not provided. In contrast, in the display device 1A in which multiple contact holes CH are arranged such that the number of contact holes CH increases as the distance from the power supply units 2A and 2B increases, as shown by line C6 in Figure 13, the voltage drop in the screen due to auxiliary wiring is made uniform along the screen position in the input direction of the auxiliary wiring.

[0039] In this way, by equalizing the resistance reduction effect within the screen due to the auxiliary wiring included in the auxiliary wiring group SG, the occurrence of display unevenness in the image displayed on the screen can be suppressed. Specifically, by changing the number of connection points between the auxiliary wiring group SG and the common electrode 4 according to the distance of the auxiliary wiring from the power supply unit 2, the resistance of the auxiliary wiring from the power supply unit 2 can be made uniform along the direction of the auxiliary wiring within the screen, thereby suppressing the occurrence of display unevenness.

[0040] This allows for the reduction of resistance by auxiliary wiring to be applied approximately uniformly across the entire screen, thereby suppressing display unevenness within the screen. Furthermore, by making the auxiliary wiring thinner, reducing the number of auxiliary wirings, and reducing the number of connection points, the area required for auxiliary wiring and connection points can be reduced, thereby suppressing display unevenness within the screen and improving the display (illumination) performance of the display.

[0041] The present invention is not limited to the embodiments described above, and various modifications are possible within the scope of the claims. Embodiments obtained by appropriately combining the technical means disclosed in different embodiments are also included in the technical scope of the present invention. Furthermore, new technical features can be formed by combining the technical means disclosed in each embodiment.

[0042] 1 Display device 2 Power supply unit 2A First power supply unit 2B Second power supply unit 3 Display unit 4 Common electrode 5 Light-emitting element 6 Pixel electrode 7 Organic insulating film 8 Pixel circuit 9 Circuit board SG Auxiliary wiring group 11 First auxiliary wiring 12 Second auxiliary wiring J1 First part J2 Second part CG Contact hole group J3 Third part J4 Fourth part 19 Pixel circuit 20 Semiconductor layer 21 Source electrode 22 Drain electrode 23 Gate electrode CH Contact hole BC Unconnected position

Claims

1. A display device comprising a display unit and a power supply unit, wherein the display unit has a group of light-emitting elements including a common electrode, a group of auxiliary wiring connected to the power supply unit, and a group of contact holes electrically connecting the common electrode and the group of auxiliary wiring, wherein the display unit includes a first portion including a part of the group of contact holes, and a second portion including another part of the group of contact holes, the area of ​​which in plan view is equal to that of the first portion, and the second portion is located further from the power supply unit and contains a larger number of contact holes compared to the first portion.

2. The display device according to claim 1, wherein the common electrode is a cathode shared by a plurality of light-emitting elements of the group of light-emitting elements.

3. The display device according to claim 1, wherein the length of each auxiliary wiring in the group of auxiliary wirings is LS, the length between the center of the first part and the power supply unit is L1, the length between the center of the second part and the power supply unit is L2, the number of contact holes in the first part is N1, the number of contact holes in the second part is N2, k > 0 and 0.8 ≤ α ≤ 1.2, and the following conditions hold: N1 = k × L1 / LS, N2 = α × k × L2 / LS.

4. A display device comprising a first power supply unit and a second power supply unit, and a display unit located between the first and second power supply units, wherein the display unit has a group of light-emitting elements including a common electrode, a group of auxiliary wiring connected to the first and second power supply units, and a group of contact holes electrically connecting the common electrode and the group of auxiliary wiring, wherein the display unit includes a first portion including a part of the group of contact holes, and a second portion including another part of the group of contact holes, the area of ​​which in plan view is equal to that of the first portion, the first and second portions are located closer to the first power supply unit than the center of the display unit, and the second portion is located further away from the first power supply unit and contains a larger number of contact holes compared to the first portion.

5. The display device according to claim 4, wherein the common electrode is a cathode shared by a plurality of light-emitting elements of the group of light-emitting elements.

6. Let LS be the length of each auxiliary wiring in the group of auxiliary wirings, L1 be the length between the center of the first section and the first power supply unit, L2 be the length between the center of the second section and the first power supply unit, N1 be the number of contact holes in the first section, N2 be the number of contact holes in the second section, k > 0 and 0.8 ≤ α ≤ 1.2, then N1 = k × {(L1 / LS) - (L1 / LS)} ２ }, and N2 = α × k × {(L2 / LS) - (L2 / LS)} ２ The display device according to claim 4, wherein the condition} is met.

7. The display device according to claim 4, wherein the display unit includes third and fourth portions that are located closer to the second power supply unit than the center of the display unit and have the same area in a plan view, and the fourth portion is located further away from the second power supply unit and contains more contact holes than the third portion.

8. Let LS be the length of each auxiliary wiring in the group of auxiliary wirings, L3 be the length between the center of the third section and the second power supply section, L4 be the length between the center of the fourth section and the second power supply section, N3 be the number of contact holes in the third section, N4 be the number of contact holes in the fourth section, k > 0 and 0.8 ≤ α ≤ 1.2, then N3 = k × {(L3 / LS) - (L3 / LS)} ２ }, and N4 = α × k × {(L4 / LS) - (L4 / LS)} ２ The display device according to claim 7, wherein the condition} is met.

9. The display device according to any one of claims 1 to 8, wherein the auxiliary wiring group includes a first auxiliary wiring that intersects with the first portion and a second auxiliary wiring that intersects with the second portion, and the number of contact holes connected to the first auxiliary wiring is equal to the number of contact holes connected to the second auxiliary wiring.

10. The display device according to any one of claims 1 to 9, wherein the maximum number of contact holes per auxiliary wiring in the group of auxiliary wirings is NA, the minimum value is NB, and 0 ≤ (NA - NB) / NA ≤ 0.

2.

11. The display device according to any one of claims 1 to 10, wherein a plurality of auxiliary wires included in the auxiliary wiring group are electrically connected within the display unit.

12. The display device according to any one of claims 1 to 11, wherein m and M are integers of 2 or more such that m < M, the first portion intersects with M auxiliary wirings extending in a first direction, the M auxiliary wirings include M connectable positions arranged in a second direction perpendicular to the first direction, m is the number of contact holes made out of the M connectable positions, and the number of non-contact-hole connectable positions located between two adjacent contact holes in the second direction is less than or equal to an integer obtained by subtracting 1 from the number obtained by rounding up the decimal part of M / m.

13. The display device according to any one of claims 1 to 12, wherein the display unit comprises a light-emitting layer including the group of light-emitting elements and a circuit board including the group of auxiliary wiring and the group of pixel circuits.

14. The display device according to claim 13, wherein the light-emitting layer includes a plurality of pixel electrodes and an organic insulating film covering the edges of each of the plurality of pixel electrodes, and a plurality of contact holes included in the contact hole group penetrate the organic insulating film.

15. The display device according to claim 14, wherein the plurality of pixel electrodes are a plurality of anodes.

16. The display device according to any one of claims 1 to 15, wherein the group of light-emitting elements includes an organic light-emitting diode or a quantum dot light-emitting diode, and the common electrode is a translucent metal film or a translucent metal oxide film.

Images