Display device

Abstract

The transmission of stray light between light-emitting elements in the display device is reduced, and the display quality of the display device is improved. The display device includes a first light-emitting element (10) having a first light-emitting region (14), a second light-emitting element (20) having a second light-emitting region (24), and a third light-emitting element (30) having a third light-emitting region (34). Any position of each light-emitting area is located at a position which is in three-time rotational symmetry with each other. The two opposite edges between every two adjacent light-emitting areas extend in the intersecting direction.

Description

Technical Field

[0001] The present disclosure relates to a display device including a plurality of light emitting elements. Background Art

[0002] Patent Document 1 discloses a micro LED display device including a micro LED for each sub-pixel. Prior art literature Patent Literature

[0003] Patent Document 1: Japanese Patent Application Publication No. 2018-185515 Summary of the invention Technical Problems to be Solved by the Invention

[0004] In a display device including a light-emitting element for each sub-pixel, such as the micro LED display device described in Patent Document 1, stray light may be generated when light emitted from a certain sub-pixel propagates to other sub-pixels. The stray light may reduce the display quality of the display device. Solutions to the problem

[0005] A display device involved in one embodiment of the present invention comprises: a first light-emitting element, which has a first light-emitting area; a second light-emitting element, which is adjacent to the first light-emitting element and has a second light-emitting area; and a third light-emitting element, which is adjacent to both the first light-emitting element and the second light-emitting element and has a third light-emitting area, when observed in a top view, any position of each of the first light-emitting area, the second light-emitting area and the third light-emitting area is located at a position that is three-fold rotationally symmetrical with each other, and when observed in a top view, the two facing sides between the first light-emitting area and the second light-emitting area, between the second light-emitting area and the third light-emitting area, and between the third light-emitting area and the first light-emitting area extend in intersecting directions. Effects of the Invention

[0006] Reduce the spread of stray light between light-emitting elements and improve display quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 This is an enlarged plan view of a pixel of the display device according to Embodiment 1. Figure 2 This is a schematic plan view of the display device according to Embodiment 1. Figure 3 This is an enlarged plan view of the display device according to Embodiment 1. Figure 4 This is a schematic side cross-sectional view of the display device according to Embodiment 1. Figure 5This is a schematic diagram for explaining the stacked structure of the light-emitting element according to Embodiment 1. Figure 6 This is another schematic side cross-sectional view of the display device according to Embodiment 1. Figure 7 This is a flowchart showing a method for manufacturing the display device according to Embodiment 1. Figure 8 The following are cross-sectional views showing the steps of the method for manufacturing the display device according to the first embodiment. Fig. 9 This is a cross-sectional view showing another step of the method for manufacturing the display device according to Embodiment 1. Fig.10 Graphs showing the relationship between the distance from the centroid of the light emitting region and the brightness in the display devices according to each of the embodiment and the comparative example. Fig.11 This is an enlarged plan view of a pixel of the display device according to Embodiment 2. Fig.12 This is a schematic side cross-sectional view of a display device according to Embodiment 3. Fig.13 This is an enlarged plan view of a pixel of a display device according to Embodiment 4. Fig.14 This is an enlarged plan view of the display device according to Embodiment 5. Fig.15 This is a schematic cross-sectional view of a wearable device according to a fifth embodiment. Fig.16 This is a schematic cross-sectional view of another wearable device involved in embodiment 5. DETAILED DESCRIPTION

[0008] [Implementation method 1] <Display Device: Overview> Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In addition, the same reference numerals are attached to the same components in each drawing, and description thereof will be omitted.

[0009] Figure 2 1 is a schematic top view of the display device 1 involved in the present embodiment. The display device 1 is a device that can be used for a display such as a television or a smartphone, or a wearable device such as an HMD, VR goggles, AR goggles, etc. The display device 1 includes a display portion DA and a frame portion NA formed on the periphery of the display portion DA. The display device 1 displays in the display portion DA by controlling the light emission from each of the multiple light-emitting elements described later formed in the display portion DA. In the frame portion NA, a driver for driving each of the multiple light-emitting elements of the display portion DA may also be formed.

[0010] <Display device: pixel and light-emitting element configuration> Reference Figure 3 The display device 1 according to this embodiment will be described in detail. Figure 3 is an enlarged top view of the display portion DA of the display device 1, especially Figure 2 The area E shown is enlarged and shown in a top view. In order to more clearly show each component, the Figure 3 The enlarged plan view of the display portion DA of the display device 1 in the present disclosure extracts and shows the light emitting regions of each light emitting element described later.

[0011] The display device 1 includes a plurality of light emitting elements, including a blue light emitting element 10 as a first light emitting element, a green light emitting element 20 as a second light emitting element, and a red light emitting element 30 as a third light emitting element. The display device 1 includes a plurality of pixels P, each pixel P including a blue light emitting element 10, a green light emitting element 20, and a red light emitting element 30.

[0012] The blue light emitting element 10 emits blue light as the first light, the green light emitting element 20 emits green light as the second light, and the red light emitting element emits red light as the third light. The display device 1 drives each of the light emitting elements of each pixel P separately, and extracts blue light, green light, and red light from each pixel. Thus, the display device 1 performs full-color display in the display portion DA.

[0013] In the present embodiment, the blue light emitting element 10 is adjacent to the green light emitting element 20 and the red light emitting element 30 included in the pixel P including the blue light emitting element 10. In addition, the blue light emitting element 10 may be adjacent to the green light emitting element 40 as the fourth light emitting element and the red light emitting element 50 as the fifth light emitting element included in a pixel P different from the pixel P including the blue light emitting element 10. In addition, in the present invention, "two light emitting elements are adjacent" means that other light emitting elements are not located between the facing sides of the light emitting regions of the two light emitting elements when viewed from above.

[0014] In this embodiment, in two adjacent pixels P, the positional relationship between the blue light emitting element 10, the green light emitting element 20, and the red light emitting element 30 in each pixel P may be different from each other. Thus, the display device 1 suppresses the reduction of display quality accompanying the visual recognition of the light emitting area of ​​the same light emitting color in the same cycle. In addition, in this embodiment, each light emitting element may also be configured so that the light emitting colors of two adjacent light emitting elements are different. Thus, in the display device 1, the reduction of display quality caused by the light emitting areas of two adjacent light emitting elements being obviously connected to each other and the substantial reduction of resolution is suppressed.

[0015] <Display device: substrate> Reference Figure 4 The configuration of the display portion DA of the display device 1 will be described in further detail. Figure 4 is a schematic side sectional view of the display device 1, particularly Figure 3 The cross-sectional view shown is along the line IV-IV. In other words, Figure 4 A side cross-section through the blue light emitting element 10 , the green light emitting element 20 , and the red light emitting element 30 of the display device 1 is shown.

[0016] like Figure 4 As shown, the display device 1 includes a first substrate 2, a second substrate 7 opposite to the first substrate 2, and a blue light emitting element 10, a green light emitting element 20, and a red light emitting element 30 between the first substrate 2 and the second substrate 7. The first substrate 2 and the second substrate 7 are formed, for example, over the display portion DA and the frame portion NA. In addition, unless otherwise specified, in the present disclosure, the direction from the first substrate 2 to each light emitting element is set as the "downward direction", and the direction from the second substrate 7 to each light emitting element is set as the "upward direction" for description.

[0017] The first substrate 2 is a hard substrate with light transmittance, for example, a sapphire substrate, which includes sapphire with a C-face on the first surface 2F located on the side of the second substrate 7. The blue light-emitting element 10, the green light-emitting element 20 and the red light-emitting element 30 are located on the first surface 2F. The second substrate 7 includes a pixel circuit 71 that drives the blue light-emitting element 10, the green light-emitting element 20 and the red light-emitting element 30 respectively by the method described later. In addition, the display device 1 has a bonding material 6 on the second surface 7F on the first substrate 2 side of the second substrate 7. The second substrate 7 is bonded to the blue light-emitting element 10, the green light-emitting element 20 and the red light-emitting element 30 via the bonding material 6. The first substrate 2 and the second substrate 7 can also be bonded around each light-emitting element in the frame portion NA by bonding materials or the like.

[0018] <Display device: Light-emitting element: Laminated structure> The blue light-emitting element 10, the green light-emitting element 20, and the red light-emitting element 30 include a base layer 3, an electron transport layer 4, a blue light-emitting layer 13 as a first light-emitting layer, and a hole transport layer 5 in order from the first substrate 2 side. In addition, the green light-emitting element 20 and the red light-emitting element 30 include an electron transport layer 4, a green light-emitting layer 23 as a second light-emitting layer, and a hole transport layer 5 in order from the first substrate 2 side on a portion of the lower surface of the hole transport layer 5 directly below the blue light-emitting layer 13. Moreover, the red light-emitting element 30 includes an electron transport layer 4, a red light-emitting layer 33 as a third light-emitting layer, and a hole transport layer 5 in order from the first substrate 2 side on a portion of the lower surface of the hole transport layer 5 directly below the green light-emitting layer 23.

[0019] The number of layers between the blue light-emitting layer 13, the green light-emitting layer 23, and the red light-emitting layer 33 and the first substrate 2 is different from each other. Therefore, the distance L1, the distance L2, and the distance L3 from the blue light-emitting layer 13, the green light-emitting layer 23, and the red light-emitting layer 33 to the first surface 2F of the first substrate 2 are different from each other. In addition, the first surface 2F of the first substrate 2 and the second surface 7F of the second substrate 7 are substantially parallel. Therefore, the distance L4, the distance L5, and the distance L6 from the blue light-emitting layer 13, the green light-emitting layer 23, and the red light-emitting layer 33 to the second surface 7F of the second substrate 7 are different from each other.

[0020] Reference Figure 5 The stacked structure of each light emitting element according to this embodiment will be described in detail. Figure 5 It is a schematic diagram showing the stacked structure from the base layer 3 to the hole transport layer 5 of the blue light-emitting element 10 in an extracted manner.

[0021] The base layer 3 is a layer for lattice matching of the sapphire crystal of the first substrate 2 as a sapphire substrate and the semiconductor crystal of the electron transport layer 4 described later. The base layer 3 includes a first buffer layer 81 and a second buffer layer 82 in sequence from the first substrate 2 side. The first buffer layer 81 may include semiconductor crystals epitaxially grown on the first surface 2F, for example, at a low temperature below 600°C, and may include gallium nitride crystals with a film thickness of 40nm. The second buffer layer 82 includes semiconductor crystals epitaxially grown on the first buffer layer 81, and may include non-doped gallium nitride crystals with a film thickness of 2μm. The first buffer layer 81 and the second buffer layer 82 may also be formed between the electron transport layer 4 and the hole transport layer 5, respectively.

[0022] The electron transport layer 4 is a layer that transports electrons from the cathode described later to the light emitting layer. The electron transport layer 4 may also include an n-type semiconductor crystal epitaxially grown on the second buffer layer 82, for example, a 2 μm-thick gallium nitride crystal containing a Group 14 element such as Si as a dopant.

[0023] The hole transport layer 5 is a layer that transports holes from the anode described later to the light emitting layer and includes a first p-type semiconductor layer 83, a second p-type semiconductor layer 84, a first n-type semiconductor layer 85, and a second n-type semiconductor layer 86 in order from the first substrate 2 side.

[0024] The first p-type semiconductor layer 83 and the second p-type semiconductor layer 84 each include a p-type semiconductor crystal formed by epitaxial growth. For example, the first p-type semiconductor layer 83 may include aluminum gallium nitride crystals with a film thickness of 20 nm, and the second p-type semiconductor layer 84 may include gallium nitride crystals with a film thickness of 120 nm. The first p-type semiconductor layer 83 and the second p-type semiconductor layer 84 may also have a Group 2 element such as Mg as a dopant.

[0025] The first n-type semiconductor layer 85 and the second n-type semiconductor layer 86 each include an n-type semiconductor crystal formed by epitaxial growth. For example, the first n-type semiconductor layer 85 may include a gallium nitride crystal with a film thickness of 25 nm, and the second n-type semiconductor layer 86 may include a gallium nitride crystal with a film thickness of 400 nm. The first n-type semiconductor layer 85 and the second n-type semiconductor layer 86 may also have a Group 14 element such as Si as a dopant.

[0026] The blue light-emitting layer 13, the green light-emitting layer 23, and the red light-emitting layer 33 include a light-emitting material that emits light using excitons generated by the recombination of electrons from the electron transport layer 4 and holes from the hole transport layer 5. The light-emitting materials of the blue light-emitting layer 13, the green light-emitting layer 23, and the red light-emitting layer 33 each emit blue light, green light, and red light, and may have, for example, a multi-quantum well structure.

[0027] For example, as a blue light-emitting layer 13 that emits blue light with a wavelength of about 450 [nm], indium gallium nitride (a mixed crystal with an atomic ratio of In to Ga of 1:4) having a thickness of 50 [nm] and an In (indium) composition ratio of 20% can be used. For example, as a green light-emitting layer 23 that emits green light with a wavelength of about 550 [nm], indium gallium nitride (mixed crystal) having an In composition ratio of 25% can be used. For example, as a red light-emitting layer 33 that emits red light with a wavelength of about 630 [nm], indium gallium nitride (mixed crystal) having an In composition ratio of 30% can be used.

[0028] <Display device: Light-emitting element: Electrode> return Figure 4 With reference to , the blue light emitting element 10, the green light emitting element 20, and the red light emitting element 30 respectively include an anode 11, an anode 21, and an anode 31. Each anode is electrically connected to the lower surface of the hole transport layer 5 of each light emitting element closest to the second substrate 7. In addition, each anode is electrically connected to each pixel circuit 71 via a bonding material 6, etc., and a voltage is applied via each pixel circuit 71.

[0029] The blue light emitting element 10, the green light emitting element 20 and the red light emitting element 30 respectively include a cathode 12, a cathode 22 and a cathode 32. Each cathode is electrically connected to a portion of the lower surface of the hole transport layer 5 of each light emitting element closest to the second substrate 7. Each cathode is connected to an auxiliary power supply (not shown) via a bonding material 6 or the like, and a common voltage is applied to the cathode.

[0030] In this embodiment, the electron transport layer 4 is an n-type semiconductor layer, and the hole transport layer 5 includes an n-type semiconductor layer on each anode side. Therefore, the display device 1 reduces the need to make a difference in work function between the material of each anode and the material of each cathode, for example, the material of each anode can be the same as the material of each cathode. Each anode and each cathode can have a stacked structure of Ti, Al, and Ti, for example.

[0031] In addition, the display device 1 involved in this embodiment is not limited to a configuration including a plurality of blue light emitting elements 10, green light emitting elements 20, and red light emitting elements 30. For example, the display device 1 may be a monochrome display device including any one of the plurality of blue light emitting elements 10, green light emitting elements 20, and red light emitting elements 30.

[0032] In addition, the display device 1 may also include a wavelength conversion layer that converts the wavelength of light emitted from each light-emitting element at a position closer to the light extraction side than each light-emitting element. For example, the display device 1 may have a plurality of blue light-emitting elements 10, and a green conversion layer and a red conversion layer are arranged as wavelength conversion layers at a position overlapping with a part of the blue light-emitting elements 10 when viewed from above, and the green conversion layer and the red conversion layer contain phosphors that emit green light and red light. Alternatively, the display device 1 may also include a plurality of light-emitting elements that emit ultraviolet light. In this case, the display device 1 may also include a blue conversion layer, a green conversion layer, and a red conversion layer as wavelength conversion layers at a position overlapping with each light-emitting element when viewed from above, and the blue conversion layer, the green conversion layer, and the red conversion layer contain phosphors that emit blue light, green light, and red light. Thus, the display device 1 may also only include a plurality of light-emitting elements of the same luminous color and be able to perform color display.

[0033] <Light-emitting Principle of Light-emitting Element> The display device 1 drives each pixel circuit 71 via a driver (not shown) or the like, thereby applying a voltage to the anode of each light-emitting element individually, thereby generating a potential difference between the anode and the cathode of each light-emitting element. As a result, the display device 1 injects holes from each anode into the hole transport layer 5 and injects electrons from each cathode into the electron transport layer 4.

[0034] In addition, holes from each anode can also be injected into the second p-type semiconductor layer 84 through the second n-type semiconductor layer 86 and the first n-type semiconductor layer 85 of the hole transport layer 5. In this case, the display device 1 can make the materials of each anode and each cathode the same, and efficiently realize the injection of charges from the electrodes in each light-emitting element. The display device 1 injects holes and electrons from the electrodes of each light-emitting element into the light-emitting layer to make the light-emitting layer emit light, thereby extracting light from each light-emitting element.

[0035] In addition, in the blue light-emitting element 10, the electrons from the cathode 12 only need to be injected into the blue light-emitting layer 13 via the electron transport layer 4 directly above the blue light-emitting layer 13, in other words, they do not need to pass through the base layer 3. In addition, in the green light-emitting element 20, the electrons from the cathode 22 only need to be injected into the green light-emitting layer 23 via the electron transport layer 4 directly above the green light-emitting layer 23, in other words, they do not need to pass through the layers closer to the first substrate 2 than the electron transport layer 4. Moreover, in the red light-emitting element 30, the electrons from the cathode 32 only need to be injected into the red light-emitting layer 33 via the electron transport layer 4 directly above the red light-emitting layer 33, in other words, they do not need to pass through the layers closer to the first substrate 2 than the electron transport layer 4.

[0036] <Light Emitting Area of ​​Light Emitting Element> Reference Figure 1 Each light-emitting element in the pixel P of the display device 1 according to the present embodiment will be described in more detail. Figure 1 is another enlarged top view of the display device 1, especially Figure 3 The pixel P is shown in a further enlarged top view. Figure 1 In FIG. 1 , a region in each light-emitting layer that emits light when a light-emitting element including the light-emitting layer is driven is extracted and shown.

[0037] The blue light emitting element 10, the green light emitting element 20, and the red light emitting element 30 have a first light emitting area 14, a second light emitting area 24, and a third light emitting area 34 as their respective light emitting areas. The first light emitting area 14, the second light emitting area 24, and the third light emitting area 34 have a quadrilateral shape when viewed from above, and in particular, have a rhombus shape in the present embodiment. Therefore, the first light emitting area 14, the second light emitting area 24, and the third light emitting area 34 have four end sides 15, four end sides 25, and four end sides 35, respectively, when viewed from above.

[0038] From the perspective of maintaining the distance between two adjacent pixels P and expanding each luminous area, it is preferred that the luminous area included in each pixel P is contained in an area whose outer shape when viewed from above is a substantially regular hexagon. By having each luminous area included in the pixel P have a quadrilateral shape when viewed from above, the outer shape of the pixel P can be closer to a substantially regular hexagon. Moreover, from the perspective of making the outer shape of the pixel P close to a substantially regular hexagon, the outer shape of each luminous area included in the pixel P can also be a rhombus, a parallelogram, or a trapezoid when viewed from above.

[0039] In addition, from the viewpoint of simplifying the mask pattern when manufacturing each light-emitting element and making it easier to manufacture the display device 1, the first light-emitting region 14, the second light-emitting region 24, and the third light-emitting region 34 may have the same shape when viewed from above. In the present invention, "having the same shape" does not necessarily mean that two components have completely identical shapes, and differences such as manufacturing errors are allowed.

[0040] One of the end edges of the light-emitting area of ​​each light-emitting element faces one of the end edges of the light-emitting area of ​​the other light-emitting element when viewed from above. Here, the two sides facing each other extend in the intersecting direction when viewed from above. In other words, the two sides are not parallel when viewed from above. For example, the two sides facing each other between the end edge 15 and the end edge 25, between the end edge 25 and the end edge 35, and between the end edge 35 and the end edge 15 extend in the intersecting direction when viewed from above.

[0041] The first light-emitting region 14, the second light-emitting region 24, and the third light-emitting region 34 have centroids 16, 26, and 36, respectively. In the present embodiment, the centroid of each light-emitting region may coincide with the intersection of two diagonals of each light-emitting region when viewed from above. In the present invention, the centroid of a region when viewed from above refers to a position where the first moment of the section is 0 when the region when viewed from above is set as a cross section.

[0042] <Positional Relationship of Light Emitting Areas> In order to explain the positional relationship of each light emitting area in the pixel P, Figure 1 , a virtual figure T is shown by a dotted line. The figure T is a figure of an equilateral triangle having a centroid TC when viewed from above, and has three vertices TV. Therefore, the figure T is a figure that is three-fold rotationally symmetric about the centroid TC when viewed from above, and the three vertices TV are located at positions that are three-fold rotationally symmetric about the centroid TC when viewed from above.

[0043] In the present embodiment, the centroids 16, 26, and 36 overlap with the vertex TV of the figure T in a plan view. Therefore, the centroids 16, 26, and 36 are located at positions that are three-fold rotationally symmetric to each other in a plan view.

[0044] In order to explain the positional relationship of each light emitting area in the pixel P, Figure 1 The imaginary second light emitting region 24A and the third light emitting region 34A are shown by dotted lines in FIG. The second light emitting region 24A and the third light emitting region 34A are respectively consistent with the regions obtained by rotating the first light emitting region 14 around a point (particularly the centroid TC) located outside the first light emitting region 14 when viewed from above.

[0045] Here, the second light-emitting region 24 is consistent with the region rotated around a point located inside the second light-emitting region 24A (particularly the centroid of the second light-emitting region 24A) when viewed from above. In addition, the third light-emitting region 34 is consistent with the region rotated around a point located inside the third light-emitting region 34A (particularly the centroid of the third light-emitting region 34A) when viewed from above. Thus, the display device 1 can easily realize a configuration in which the two sides facing each other between the end side 15 and the end side 25 and between the end side 15 and the end side 35 are non-parallel when viewed from above.

[0046] <Reduction of stray light> Reference Figure 1 The effects achieved by the positional relationship of the light-emitting areas will be described.

[0047] Light from each light emitting element of the display device 1 can be used for display on the display portion DA by taking out light from each light emitting layer toward the first substrate 2 or the second substrate 7. On the other hand, light from each light emitting element of the display device 1 includes light emitted from the side of each light emitting layer, and this light includes a component that propagates from a certain light emitting element toward other light emitting elements.

[0048] For example, light propagating from each light emitting element in a direction parallel to the display surface of the display device is difficult to be used for display. Therefore, the generation of this light leads to a decrease in the efficiency of light extraction from each light emitting element.

[0049] In addition, among the light propagating from a certain light-emitting element toward other light-emitting elements, light propagating in a direction deviating from a direction parallel to the display surface of the display device is sometimes extracted from a position overlapping with the other light-emitting element when viewed from above. This light is stray light extracted from a position different from the assumed position of the original extraction, which reduces the display quality of the display device. Moreover, the stray light sometimes undergoes multiple reflections between the light-emitting elements, which sometimes leads to further reduction in the display quality of the display device.

[0050] In this embodiment, the two sides facing each other between two adjacent light-emitting regions are not parallel when viewed from above. Therefore, light emitted from the side of the light-emitting layer of a certain light-emitting element is refracted when incident on other light-emitting elements. Moreover, in this embodiment, a portion of each light-emitting region is located at a position that is three-fold rotationally symmetrical when viewed from above. Therefore, as described above, the refracted light can propagate in a circumferential manner between the three light-emitting elements comprising the light-emitting region, and a portion of the light-emitting region is located at a position that is three-fold rotationally symmetrical to each other when viewed from above.

[0051] For example, Figure 1As shown, light SL1 is emitted from the side of the blue light-emitting layer 13 toward the direction toward the green light-emitting element 20. In this case, the light L1 incident on the green light-emitting element 20 is refracted at the end 25 of the second light-emitting region 24, and propagates in the green light-emitting element 20 as light SL2. Moreover, the light SL2 is refracted again at the other end 25 of the second light-emitting region 24, and becomes light SL3 propagating toward the red light-emitting element 30. By repeating the above-mentioned actions, the light emitted from the side of any light-emitting layer in the pixel P propagates in a circling manner in the pixel P when viewed from above. Therefore, the display device 1 suppresses the light from being taken out of the pixel P and becoming stray light.

[0052] As described above, the display device 1 involved in this embodiment reduces the light emitted from the side of the light-emitting layer of a certain light-emitting element and is extracted from the position overlapping with the light-emitting element far away when viewed from above. Therefore, the display device 1 reduces the generation of stray light and improves the display quality. In addition, the display device 1 involved in this embodiment relatively increases the intensity of light from each light-emitting layer toward the display surface, thereby improving the light extraction efficiency from each light-emitting element.

[0053] In particular, in the present embodiment, the centroids 16, 26, and 36 are located at positions that are three-fold rotationally symmetric to each other when viewed from above. Thus, the display device 1 can improve the rotational symmetry of the positions of the first light-emitting region 14, the second light-emitting region 24, and the third light-emitting region 34 when viewed from above, and further reduce stray light.

[0054] <Relationship between the side surface of the light-emitting layer and the surface of the substrate> Reference Figure 6 , the light-emitting element involved in this embodiment is described in more detail. Figure 6 is another schematic side cross-sectional view of the display device 1 according to the present embodiment. In particular, Figure 6 yes Figure 1 The cross-sectional view taken along the line VI-VI is, in other words, a schematic side cross-sectional view of the display device 1 passing through the red light emitting element 30 .

[0055] The outer side surface of the red light emitting element 30 includes the outer side surface 13S of the blue light emitting layer 13, the outer side surface 23S of the green light emitting layer 23, and the outer side surface 33S of the red light emitting layer 33, and is substantially coplanar. Here, the outer side surface of the red light emitting element 30 forms a first angle A1 with the first surface 2F of the first substrate 2, and forms a second angle A2 with the second surface 7F of the second substrate 7.

[0056] In this embodiment, the red light emitting element 30 may also have a portion in the shape of a truncated cone, and the portion in the shape of a truncated cone has one side of the front end on the side of the first substrate 2. In this case, in this portion, the first angle A1 is an acute angle, and the second angle A2 is an obtuse angle. In other words, the outer side surface 13S, the outer side surface 23S, and the outer side surface 33S form an acute angle with the first surface 2F and an obtuse angle with the second surface 7F.

[0057] In addition, the blue light-emitting element 10 and the green light-emitting element 20 have the same structure as the red light-emitting element 30, except that a part of each layer on the second substrate 7 side is replaced with the bonding material 6. Therefore, in the blue light-emitting element 10 and the green light-emitting element 20, the outer side surface of each light-emitting layer forms an acute angle with the first surface 2F and an obtuse angle with the second surface 7F.

[0058] According to the above configuration, the display device 1 can reduce the component of light that propagates in a direction parallel to the first surface 2F or the second surface 7F in the light emitted from the outer side surface of each light-emitting layer, thereby improving the light extraction efficiency from each light-emitting element. In addition, the display device 1 reduces the propagation of stray light from the outer side surface of each light-emitting element, especially the outer side surface of each light-emitting layer, to a distant place, thereby improving the display quality.

[0059] <Method for Manufacturing Display Device> Reference Figures 7 to 9 A method for manufacturing the display device 1 according to the present embodiment will be described. Figure 7 1 is a flowchart showing a method for manufacturing the display device 1 . Figure 8 and Fig. 9 The process cross-sectional views in this embodiment all show the process cross-sectional views of the manufacturing method of the display device 1. Figure 4 The cross section of the display device 1 shown corresponds to the cross section of the display device 1 at the position.

[0060] like Figure 7 As shown, in the manufacturing method of the display device 1, firstly, the first substrate 2 is prepared (step S1). In step S1, the first substrate 2 with the first surface 2F facing upward is prepared. In step S1, a large sheet of the first substrate 2 can be prepared. In this case, in the manufacturing method of the display device 1, it can also be cut together with the second substrate 7 and singulated into individual display devices 1.

[0061] Next, the base layer 3 is formed on the first surface 2F of the first substrate 2 (step S2), the electron transport layer 4 is formed (step S3), the light emitting layer is formed (step S4), and the hole transport layer 5 is formed (step S5). The film formation of each layer can be performed by the above method. In addition, when the display device 1 has multiple light emitting layers, steps S3 to S5 can be repeated according to the number of light emitting layers. Thus, if Figure 8As shown in step S5, a stacked structure of multiple semiconductor layers is formed on the first substrate 2.

[0062] Next, the semiconductor layer is etched (step S6). In step S6, the semiconductor layer may be etched by dry etching, for example. Step S6 may be performed by repeatedly forming a resist, patterning the resist by photolithography, etching the semiconductor layer exposed from the resist when viewed from above, and removing the resist.

[0063] In step S6, etching is performed at the formation position of each light-emitting element so that a portion of the hole transport layer 5 directly above the light-emitting layer included in the light-emitting element and a portion of the electron transport layer 4 directly below are exposed. For example, at the formation position of the blue light-emitting element 10, etching is performed so that a portion of the hole transport layer 5 directly above the blue light-emitting layer 13 and a portion of the electron transport layer 4 directly below are exposed.

[0064] Furthermore, all semiconductor layers on the first substrate 2 are removed between the positions where the light emitting elements are formed. In step S6, the angle between the end faces of each layer and the first surface 2F, in other words, the first angle A1, can be controlled by changing the patterning and etching conditions when removing the semiconductor layers between the positions where the light emitting elements are formed. Figure 8 The structure shown in step S8. In addition, the semiconductor layer between the formation positions of each light emitting element can also be removed after the formation of the electrode described later.

[0065] Next, electrodes including the anode and cathode of each light-emitting element are formed (step S7). For example, in step S7, after forming a resist pattern at a position including the upper surface of the electron transport layer 4 and the upper surface of the hole transport layer 5 exposed in step S6, a metal thin film is formed by a vapor deposition method in the order of Ti, Al, and Ti. Next, the resist pattern is removed, and the formed metal thin film is patterned. By the above, as Figure 8 As shown in step S7, at the formation position of each light-emitting element, each anode is formed on the upper surface of the hole transport layer 5, and each cathode is formed on the upper surface of the electron transport layer 4. The above manufacturing method can be performed when the materials of each anode and each cathode are the same, which reduces the need to perform the film forming process of each anode and the film forming process of each cathode separately, making the manufacturing method of the display device 1 simpler.

[0066] Through the above, the first stack LA1 is formed on the first substrate 2. The first stack LA1 is formed with a semiconductor layer and an electrode. Afterwards, in this embodiment, a process of forming a protective layer can also be performed, and the protective layer covers the side surfaces of the blue light emitting element 10, the green light emitting element 20, and the red light emitting element 30 on the first substrate 2.

[0067] In the manufacturing method of the display device 1 according to the present embodiment, the second substrate 7 is prepared separately from the formation of the first laminate LA1 (step S8). In step S8, the second substrate 7 is prepared with the second surface 7F facing upward. In step S8, the pixel circuit 71 may be formed on the second substrate 7.

[0068] Next, a bonding material 6 is formed on the second surface 7F (step S9). The bonding material 6 can be formed, for example, by film formation of a photosensitive resin and patterning of the photosensitive resin formed by photolithography. In step S8, the height of each bonding material 6 is designed in consideration of the height of each layer formed in the first stack LA1 to which the second stack LA2 described later is attached. In step S8, a contact portion for realizing electrical connection between the pixel circuit 71 and the anode, and between the auxiliary electrode and the cathode can be formed on the bonding material 6.

[0069] Through the above, the second stacked body LA2 is formed on the second substrate 7, and the bonding material 6 is formed in the second stacked body LA2.

[0070] After step S7 and step S9 are completed, in the manufacturing method of the display device 1 involved in the present embodiment, the first stack LA1 and the second stack LA2 are bonded together (step S10). In step S10, for example, the first surface 2F and the second surface 7F are made to face each other, and the first substrate 2 and the second substrate 7 are bonded using an adhesive material not shown in the figure, so that the first stack LA1 and the second stack LA2 are bonded together. Through the above, the manufacturing method of the display device 1 is completed. In addition, after bonding the first stack LA1 and the second stack LA2, the first substrate 2 can be peeled off from each light-emitting element by a laser peeling method or the like.

[0071] <Evaluation of Optical Characteristics of Display Device> Hereinafter, display devices according to Examples and Comparative Examples were produced, and the optical characteristics of each display device were evaluated.

[0072] The display device involved in the embodiment has the same structure as the display device 1 involved in the present embodiment, and is manufactured by the same method as the manufacturing method of the above-mentioned display device 1. The display device involved in the comparative example is different from the display device 1 involved in the present embodiment only in the shape of the light-emitting area of ​​each light-emitting element when viewed from above. Each light-emitting area of ​​the display device involved in the comparative example is rectangular and arranged in a matrix direction when viewed from above. In addition, in the display device involved in the comparative example, the two facing sides of two adjacent light-emitting areas extend substantially in parallel.

[0073] In each of the examples and comparative examples, only one light-emitting element in each display device was made to emit light, and the brightness at each position on the display surface of each display device was measured. Fig.10Graph G1 shows the measurement results in the display device according to the embodiment, and graphs G2 and G3 show the measurement results in the display device according to the comparative example. Fig.10 In each of the graphs shown, the vertical axis represents the distance from the centroid of the light-emitting region of the light-emitting element when viewed from above (unit: μm), and the horizontal axis represents the brightness (unit: W / μm 2 ). Graph G1 and graph G2 show the display devices of the embodiment and the comparative example, respectively. Figure 4 The measurement results of the measurement surface MA shown in FIG. 1 and the curve G3 show the measurement results of the measurement surface MA shown in FIG. Figure 4 The measurement results of the measurement plane MB are shown. The measurement plane MA is located 200 nm away from the first surface 2F of the first substrate 2 toward the inner side, and the measurement plane MA is located at the interface between the first surface 2F of the first substrate and each light-emitting element. In addition, it should be noted that Fig.10 The data of the various graphs shown are plotted using a scale that can show the maximum brightness, and the scale of the axes is different for each graph.

[0074] As from Fig.10 As can be clearly seen from the comparison of the various graphs, the display device involved in the embodiment has a high brightness near the centroid of the light-emitting area of ​​the light-emitting element compared to the display device involved in the comparative example, and the brightness drops sharply at a position about 10 μm away from the centroid. Moreover, compared to the display device involved in the comparative example, the display device involved in the embodiment can hardly obtain the brightness at a position more than 100 μm away from the centroid. It can be seen that, compared to the display device involved in the comparative example, in the display device involved in the embodiment, the stray light taken out at a position far away from the light-emitting area of ​​the light-emitting element is reduced.

[0075] [Implementation method 2] <Modification of the Shape of the Light Emitting Region> Will refer to Fig.11 A display device according to another embodiment will be described. Fig.11 is an enlarged top view of the display device 1 according to the present embodiment, showing the Figure 1 The area shown is the same area.

[0076] The display device 1 involved in this embodiment has the same structure as the display device 1 involved in the previous embodiment except for the formation position of each light-emitting element. In this embodiment, especially in this embodiment, the centroid 16, the centroid 26 and the centroid 36 are located at different positions from the vertices TV of the figure T when viewed from above. Among them, each vertex TV of the figure T overlaps with a part of the first light-emitting area 14, the second light-emitting area 24 and the third light-emitting area 34 when viewed from above. The display device 1 involved in this embodiment can be manufactured by a manufacturing method in which the etching position of the semiconductor layer in step S6 is changed in the manufacturing method of the display device 1 involved in the previous embodiment.

[0077] In summary, in the display device 1 according to the present embodiment, any part of each of the first light-emitting region 14, the second light-emitting region 24, and the third light-emitting region 34 is also located at a position that is three-fold rotationally symmetrical with each other. Therefore, for the same reasons as those described in the previous embodiments, the display device 1 according to the present embodiment reduces the propagation of stray light between light-emitting elements to improve display quality.

[0078] [Implementation method 3] <Modification of the Shape of Light Emitting Element> Will refer to Fig.12 A display device according to another embodiment will be described. Fig.12 is a schematic side sectional view of a display device 1 according to the present embodiment, showing Figure 6 Side section view of the same position as shown.

[0079] The display device 1 involved in this embodiment has the same structure as the display device 1 involved in the above-mentioned embodiments, except that the first angle A1 is an obtuse angle and the second angle A2 is an acute angle. In this embodiment, each light-emitting element of the display device 1 may also have a frustum shape having a front end on the second substrate 7 side. The display device 1 involved in this embodiment can be manufactured by a manufacturing method in which the etching conditions of the semiconductor layer in step S6 and the formation conditions of the bonding material 6 in step S9 are changed in the manufacturing method of the display device 1 involved in the previous embodiment. The display device 1 involved in this embodiment improves the light extraction efficiency from each light-emitting element for the same reasons as above, and reduces the propagation of stray light from the outer side of each light-emitting layer to a distant place, thereby improving the display quality.

[0080] [Implementation method 4] <Concavity and Concavity of Light Emitting Area> Will refer to Fig.13 A display device according to another embodiment will be described. Fig.13is an enlarged top view of the display device 1 according to the present embodiment, showing the Figure 1 The area shown is the same area.

[0081] The display device 1 according to the present embodiment has the same configuration as the display devices 1 according to the above embodiments, except for the shape of the light-emitting region of each light-emitting element when viewed from above. The light-emitting region of any light-emitting element according to the present embodiment has at least one of a convex portion protruding outward from the surrounding area when viewed from above and a concave portion recessed inward from the surrounding area when viewed from above.

[0082] For example, Fig.13 As shown, the first light emitting region 14 has a convex portion 18 and a concave portion 19, the second light emitting region 24 has a convex portion 28 and a concave portion 29, and the third light emitting region 34 has a convex portion 38 and a concave portion 39. The display device 1 involved in this embodiment can be manufactured by a manufacturing method in which the etching position of the semiconductor layer in step S6 is changed in the manufacturing method of the display device 1 involved in the previous embodiment.

[0083] In addition, in this embodiment, the end edges of each light-emitting region are located on a line segment connecting the vertices of each light-emitting region in a plan view. Therefore, in this embodiment, the two sides facing each other between the end edges 15 and 25, between the end edges 25 and 35, and between the end edges 35 and 15 extend in a direction that intersects in a plan view. The display device 1 involved in this embodiment reduces the propagation of stray light between light-emitting elements to improve display quality for the same reasons as above.

[0084] Furthermore, each light-emitting region according to the present embodiment has a concave portion and a convex portion. Therefore, the display device 1 according to the present embodiment makes the extending directions of the side surfaces facing each other of the two adjacent light-emitting layers further different. Therefore, the display device 1 according to the present embodiment further reduces the propagation of stray light between the light-emitting elements and improves the display quality for the same reason as above.

[0085] [Fifth embodiment] <Modification of Arrangement of Light Emitting Elements> Will refer to Fig.14 A display device according to another embodiment will be described. Fig.14 is an enlarged top view of the display device 1 according to the present embodiment, showing the Figure 3 The area shown is the same area.

[0086] The display device 1 according to the present embodiment is different from the display device 1 according to the above embodiments in configuration except for the arrangement method of each light emitting element. In particular, in the display device 1 according to the present embodiment, the positional relationship of the blue light emitting element 10, the green light emitting element 20, and the red light emitting element 30 when viewed from above is the same in all pixels P. The display device 1 according to the present embodiment can be manufactured by a manufacturing method in which the etching position of the semiconductor layer in step S6 is changed in the manufacturing method of the display device 1 according to the previous embodiment.

[0087] In this embodiment, the blue light emitting element 10 is adjacent to the green light emitting element 20 and the red light emitting element 30 included in the pixel P including the blue light emitting element 10. In addition, the blue light emitting element 10 is adjacent to the green light emitting element 40 and the red light emitting element 50 included in the pixel P different from the pixel P including the blue light emitting element 10. Moreover, in this embodiment, each light emitting element is configured so that the emission colors of two adjacent light emitting elements are different. Thus, in the display device 1, the reduction in display quality caused by the light emitting areas of two adjacent light emitting elements being obviously connected to each other and the substantial reduction in resolution is suppressed.

[0088] [Implementation method 6] <Wearable devices> Fig.15 and Fig.16 1 is a schematic cross-sectional view showing a configuration example of a wearable device according to the present embodiment. Fig.15 The wearable device 90 and Fig.16 The wearable device 91 shown in the figure is provided with a light emitting device 92. The light emitting device 92 has a plurality of pixels P according to the above-mentioned embodiments, and the pixel P includes the blue light emitting element 10, the green light emitting element 20, and the red light emitting element 30 according to the above-mentioned embodiments.

[0089] Wearable device 90 and wearable device 91 can be installed on the body or other devices. Fig.15 As shown, in the wearable device 90, the light from the pixel P can also be directly incident on the human eye or sensor. Fig.16 As shown, in the wearable device 91, light from the pixel P can also be incident via the projector 93. The wearable device 90 and the wearable device 91 can each also make the image of the outside world 94 overlap with the image of the light emitting device 92.

[0090] <Conclusion> The display device involved in Mode 1 of the present disclosure comprises: a first light-emitting element, which has a first light-emitting area; a second light-emitting element, which is adjacent to the first light-emitting element and has a second light-emitting area; and a third light-emitting element, which is adjacent to both the first light-emitting element and the second light-emitting element and has a third light-emitting area. When observed in a top view, any part of each of the first light-emitting area, the second light-emitting area and the third light-emitting area is located at a position that is three-fold rotationally symmetrical with each other, and when observed in a top view, the two facing sides between the first light-emitting area and the second light-emitting area, between the second light-emitting area and the third light-emitting area, and between the third light-emitting area and the first light-emitting area extend in intersecting directions.

[0091] The display device involved in Mode 2 of the present disclosure may also be in Mode 1 above, wherein the centroids of the first light-emitting area, the second light-emitting area, and the third light-emitting area are located at positions that are three-fold rotationally symmetric to each other when viewed from above.

[0092] The display device according to aspect 3 of the present disclosure may be configured such that, in aspect 1 or 2, the first light emitting region, the second light emitting region, and the third light emitting region have the same shape when viewed from above.

[0093] The display device involved in Mode 4 of the present disclosure may also be in Mode 3 above, when viewed from above, in which, for at least one of the first light-emitting area, the second light-emitting area, and the third light-emitting area, an area rotated around the outer side of the at least one light-emitting area and around the inner side of the at least one light-emitting area after rotation is consistent with any of the remaining light-emitting areas.

[0094] The display device involved in mode 5 of the present disclosure may also be any one of the above-mentioned modes 1 to 4, wherein each of the first light-emitting area, the second light-emitting area and the third light-emitting area has a quadrilateral shape when viewed from above.

[0095] The display device involved in Mode 6 of the present disclosure may also be in the above-mentioned Mode 5, wherein each of the first light-emitting area, the second light-emitting area and the third light-emitting area is any one of a rhombus, a parallelogram, or a trapezoid when viewed from above.

[0096] The display device according to aspect 7 of the present disclosure may be any one of aspects 1 to 6, wherein the first light-emitting element includes a first light-emitting layer, the second light-emitting element includes a second light-emitting layer, and the third light-emitting element includes a third light-emitting layer.

[0097] The display device according to aspect 8 of the present disclosure may be the above-mentioned aspect 7, wherein the display device includes a first substrate on which the first light emitting element, the second light emitting element, and the third light emitting element are located.

[0098] The display device involved in mode 9 of the present disclosure may also be in the above-mentioned mode 8, wherein the first angle formed by the first surface of the first substrate which is a surface on one side of the first light-emitting element, the second light-emitting element, and the third light-emitting element and any side surface of the first light-emitting layer, the second light-emitting layer, and the third light-emitting layer is an acute angle or an obtuse angle.

[0099] The display device involved in mode 10 of the present disclosure may also be in the above-mentioned mode 8 or 9, wherein at least two of the first light-emitting layer, the second light-emitting layer and the third light-emitting layer are at different distances from the first surface of the first substrate, and the first surface is the surface of one side of the first light-emitting element, the second light-emitting element and the third light-emitting element.

[0100] The display device involved in mode 11 of the present disclosure may also be any one of the above-mentioned modes 7 to 10, wherein the display device includes a second substrate, and the second substrate is bonded to each light-emitting area of ​​the first light-emitting element, the second light-emitting element and the third light-emitting element via a bonding material.

[0101] The display device involved in mode 12 of the present disclosure may also be in the above-mentioned mode 11, wherein the second angle formed by the second surface of the second substrate as the surface on one side of the bonding material and any side surface of the first light-emitting layer, the second light-emitting layer and the third light-emitting layer is an acute angle or an obtuse angle.

[0102] The display device involved in mode 13 of the present disclosure may also be in the above-mentioned mode 11 or 12, wherein the second substrate includes a pixel circuit, and the pixel circuit drives each light-emitting area of ​​the first light-emitting element, the second light-emitting element, and the third light-emitting element.

[0103] The display device involved in mode 14 of the present disclosure may also be in any one of the above-mentioned modes 11 to 13, wherein at least two of the first light-emitting layer, the second light-emitting layer, and the third light-emitting layer are at different distances from the second surface of the second substrate, and the second surface is the surface on one side of the bonding material.

[0104] The display device involved in mode 15 of the present disclosure may also be in any one of the above-mentioned modes 1 to 14, wherein, when observed in a top view, at least one of the first light-emitting area, the second light-emitting area and the third light-emitting area has at least one of the following: a convex portion, which protrudes outward than the surrounding area when observed in a top view; and a concave portion, which is concave inward than the surrounding area when observed in a top view.

[0105] The display device involved in mode 16 of the present disclosure may also be in any one of the above-mentioned modes 1 to 15, wherein the first light-emitting element emits a first light, the second light-emitting element emits a second light having a wavelength different from that of the first light, and the third light-emitting element emits a third light having a wavelength different from that of both the first light and the second light.

[0106] The display device involved in mode 17 of the present disclosure may also be in the above-mentioned mode 16, wherein the display device comprises: a fourth light-emitting element, which is adjacent to the first light-emitting element when viewed from above and emits the second light; and a fifth light-emitting element, which is adjacent to the first light-emitting element when viewed from above and emits the third light.

[0107] The display device according to aspect 18 of the present disclosure may be configured such that, in aspect 16 or 17, the first light is blue light, the second light is green light, and the third light is red light.

[0108] The display device involved in mode 19 of the present disclosure may also be in any one of the above-mentioned modes 1 to 18, wherein the display device is a wearable device having a light-emitting device, and the light-emitting device includes the first light-emitting element, the second light-emitting element, and the third light-emitting element.

[0109] The present disclosure is not limited to the above-mentioned embodiments, and various changes can be made within the scope of the claims. The embodiments obtained by appropriately combining the technical solutions disclosed in different embodiments are also included in the technical scope of the present disclosure. Moreover, new technical features can be formed by combining the technical methods disclosed in each embodiment.

[0110] [Cross-reference of related applications] This application claims the benefit of priority to Japanese Patent Application No. 2023-099524 filed on June 16, 2023, and all of its contents are incorporated into this application by reference. Description of Reference Numerals

[0111] 1 Display device 2. First substrate 2F first surface 6. Bonding materials 7 Second substrate 7F Second Surface 10 blue light emitting element (first light emitting element) 13 Blue light emitting layer (first light emitting layer) 14First light emitting area 16 Centroid (of the first light emitting area) 20 Green light emitting element (second light emitting element) 23 Green light-emitting layer (second light-emitting layer) 24 Second light emitting area 26 Centroid (of the second light emitting area) 30 red light emitting element (third light emitting element) 33 Red light-emitting layer (third light-emitting layer) 34Third light emitting area 36 (centroid of the third luminous area) 71 Pixel Circuit A1 First Angle A2 second angle.

Claims

1. A display device, characterized in that: include: A first light emitting element having a first light emitting region; a second light-emitting element, which is adjacent to the first light-emitting element and has a second light-emitting area; as well as a third light emitting element, which is adjacent to both the first light emitting element and the second light emitting element and has a third light emitting region, When viewed from above, any part of each of the first light-emitting area, the second light-emitting area, and the third light-emitting area is located at positions that are three-fold rotationally symmetrical with each other. When viewed from above, the two facing sides between the first light-emitting area and the second light-emitting area, between the second light-emitting area and the third light-emitting area, and between the third light-emitting area and the first light-emitting area extend along intersecting directions.

2. The display device according to claim 1, characterized in that When viewed from above, the centroids of the first light-emitting area, the second light-emitting area, and the third light-emitting area are located at positions that are three-fold rotationally symmetric to each other.

3. The display device according to claim 1 or 2, characterized in that: When viewed from above, the first light emitting area, the second light emitting area, and the third light emitting area have the same shape.

4. The display device according to claim 3, characterized in that: When observed from above, for at least one of the first, second and third light-emitting areas, an area formed by rotating around the outer side of the at least one light-emitting area and around the inner side of the rotated at least one light-emitting area is consistent with any of the remaining light-emitting areas.

5. The display device according to claim 1 or 2, characterized in that: When viewed from above, each of the first light-emitting area, the second light-emitting area, and the third light-emitting area is a quadrilateral shape.

6. The display device according to claim 5, characterized in that: When viewed from above, each of the first light-emitting area, the second light-emitting area, and the third light-emitting area is any one of a rhombus, a parallelogram, or a trapezoid.

7. The display device according to claim 1 or 2, characterized in that: The first light-emitting element includes a first light-emitting layer, the second light-emitting element includes a second light-emitting layer, and the third light-emitting element includes a third light-emitting layer.

8. The display device according to claim 7, characterized in that: The display device includes a first substrate on which the first light emitting element, the second light emitting element, and the third light emitting element are located.

9. The display device according to claim 8, characterized in that: A first angle formed between a first surface of the first substrate as a surface on one side of the first light-emitting element, the second light-emitting element, and the third light-emitting element and any side surface of the first light-emitting layer, the second light-emitting layer, and the third light-emitting layer is an acute angle or an obtuse angle.

10. The display device according to claim 8, characterized in that: At least two of the first light-emitting layer, the second light-emitting layer and the third light-emitting layer are at different distances from a first surface of the first substrate, and the first surface is a surface on one side of the first light-emitting element, the second light-emitting element and the third light-emitting element.

11. The display device according to claim 7, characterized in that: The display device includes a second substrate bonded to each light emitting region of the first light emitting element, the second light emitting element, and the third light emitting element via a bonding material.

12. The display device according to claim 11, characterized in that: A second angle formed between a second surface of the second substrate, which is a surface of one side of the bonding material, and any side surface of the first light-emitting layer, the second light-emitting layer, and the third light-emitting layer is an acute angle or an obtuse angle.

13. The display device according to claim 11, characterized in that The second substrate includes a pixel circuit that drives each light-emitting area of ​​the first light-emitting element, the second light-emitting element, and the third light-emitting element.

14. The display device according to claim 11, characterized in that: At least two of the first light-emitting layer, the second light-emitting layer, and the third light-emitting layer are at different distances from a second surface of the second substrate, and the second surface is a surface on one side of the bonding material.

15. The display device according to claim 1 or 2, characterized in that: When viewed from above, at least one of the first light-emitting area, the second light-emitting area, and the third light-emitting area has at least one of the following: a convex portion that protrudes outward from its surroundings when viewed from above; and The concave portion is recessed inwardly relative to the surrounding area when viewed from above.

16. The display device according to claim 1 or 2, characterized in that: The first light emitting element emits a first light, the second light emitting element emits a second light having a wavelength different from the first light, and the third light emitting element emits a third light having a wavelength different from both the first light and the second light.

17. The display device according to claim 16, characterized in that: The display device comprises: a fourth light-emitting element, which is adjacent to the first light-emitting element when viewed from above and emits the second light; and The fifth light emitting element is adjacent to the first light emitting element in a plan view and emits the third light.

18. The display device according to claim 16, characterized in that: The first light is blue light, the second light is green light, and the third light is red light.

19. The display device according to claim 1 or 2, characterized in that: The display device is a wearable device including a light-emitting device, and the light-emitting device includes the first light-emitting element, the second light-emitting element, and the third light-emitting element.

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