Indication device

Abstract

To reduce stray light propagation between light emitting elements in a display and improve the display quality of the display.SOLUTION: A display has a first light emitting element (10) having a first light emitting area (14), a second light emitting element (20) having a second light emitting area (24), and a third light emitting element (30) having a third light emitting area (34). Any of the positions of each light emitting area is in three-fold rotational symmetry with each other. The two sides facing each other between two adjacent light emitting areas extend in an intersecting direction.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

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

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2018-185515 Summary of the Invention [Problem to be solved by the invention]

[0004] In a display device having a light-emitting element for each subpixel, such as the micro LED display device described in Patent Document 1, stray light may occur, where light emitted from one subpixel propagates to another subpixel. This stray light can degrade the display quality of the display device. [Means for solving the problem]

[0005] A display device according to one embodiment of the present disclosure comprises a first light-emitting element having a first light-emitting region, a second light-emitting element adjacent to the first light-emitting element and having a second light-emitting region, and a third light-emitting element adjacent to both the first light-emitting element and the second light-emitting element and having a third light-emitting region, wherein, in a planar view, any position of the first light-emitting region, the second light-emitting region, and the third light-emitting region is three-fold rotationally symmetric with respect to each other, and between the first light-emitting region and the second light-emitting region, between the second light-emitting region and the third light-emitting region, and between the third light-emitting region and the first light-emitting region, two sides facing each other in a planar view extend in intersecting directions. [Effects of the Invention]

[0006] The propagation of stray light between light-emitting elements is reduced, improving display quality. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is an enlarged plan view of a pixel of the display device according to the first embodiment. [Figure 2] 1 is a schematic plan view of a display device according to a first embodiment. [Figure 3] 1 is an enlarged plan view of a display device according to a first embodiment. [Figure 4] 1 is a schematic cross-sectional side view of a display device according to a first embodiment. [Figure 5] 1 is a schematic diagram illustrating a layered structure of the light-emitting element according to Embodiment 1. FIG. [Figure 6] 4 is another schematic cross-sectional side view of the display device according to the first embodiment. FIG. [Figure 7] 3 is a flowchart showing a method for manufacturing the display device according to the first embodiment. [Figure 8] 3A to 3C are cross-sectional views showing steps in a manufacturing method for the display device according to the first embodiment. [Figure 9] 5A to 5C are cross-sectional views showing other steps in the method for manufacturing the display device according to the first embodiment. [Figure 10] 10 is a graph showing the relationship between the distance from the centroid of a light-emitting region and luminance in display devices according to an example and a comparative example. [Figure 11] FIG. 10 is an enlarged plan view of a pixel of the display device according to the second embodiment. [Figure 12] FIG. 10 is a schematic cross-sectional side view of a display device according to a third embodiment. [Figure 13] FIG. 10 is an enlarged plan view of a pixel of a display device according to a fourth embodiment. [Figure 14] FIG. 10 is an enlarged plan view of a display device according to a fifth embodiment. [Figure 15] FIG. 10 is a schematic cross-sectional view of a wearable device according to a fifth embodiment. [Figure 16] FIG. 10 is a schematic cross-sectional view of another wearable device according to the fifth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0008] [Embodiment 1] <Display device: Overview> Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In each drawing, the same components are denoted by the same reference numerals and the description thereof will be omitted.

[0009] FIG. 2 is a schematic plan view of a display device 1 according to this embodiment. The display device 1 can be used, for example, as a display for a television or a smartphone, or as a wearable device such as an HMD, VR goggles, or AR goggles. The display device 1 includes a display unit DA and a frame unit NA formed around the periphery of the display unit DA. The display device 1 displays an image on the display unit DA by controlling light emission from each of a plurality of light-emitting elements (described later) formed in the display unit DA. Drivers and the like for driving each of the plurality of light-emitting elements of the display unit DA may be formed in the frame unit NA.

[0010] <Display device: arrangement of pixels and light-emitting elements> Details of the display device 1 according to this embodiment will be described with reference to Fig. 3. Fig. 3 is an enlarged plan view of the display unit DA of the display device 1, and in particular, is an enlarged plan view of the region E shown in Fig. 2. Note that the enlarged plan views of the display unit DA of the display device 1 in this disclosure, including Fig. 3, show the light-emitting regions of the light-emitting elements described below in order to more clearly show each component.

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

[0012] The blue light-emitting element 10 emits blue light as a first light, the green light-emitting element 20 emits green light as a second light, and the red light-emitting element emits red light as a third light. The display device 1 individually drives each of the light-emitting elements of each pixel P to extract blue light, green light, and red light from each pixel. This allows the display device 1 to perform full-color display on the display unit DA.

[0013] In this embodiment, the blue light-emitting element 10 is adjacent to a green light-emitting element 20 and a red light-emitting element 30 included in a pixel P that includes the blue light-emitting element 10. The blue light-emitting element 10 may also be adjacent to a green light-emitting element 40 as a fourth light-emitting element and a red light-emitting element 50 as a fifth light-emitting element, both of which are included in a pixel P different from the pixel P that includes the blue light-emitting element 10. In this disclosure, "two light-emitting elements adjacent to each other" means that no other light-emitting element is located between the opposing sides of the light-emitting regions of the two light-emitting elements in a plan view.

[0014] In this embodiment, two adjacent pixels P may have different positional relationships between the blue light-emitting elements 10, green light-emitting elements 20, and red light-emitting elements 30 in each pixel P. This allows the display device 1 to suppress degradation of display quality caused by light-emitting areas of the same light color being visible in the same cycle. Also, in this embodiment, the light-emitting elements may be arranged so that the light-emitting colors of two adjacent light-emitting elements are different. This allows the display device 1 to suppress degradation of display quality caused by the light-emitting areas of two adjacent light-emitting elements appearing to be connected, effectively reducing resolution.

[0015] <Display device: board> The structure of the display unit DA of the display device 1 will be described in further detail with reference to Fig. 4. Fig. 4 is a schematic side cross-sectional view of the display device 1, and in particular, a cross-sectional view taken along line IV-IV in Fig. 3. In other words, Fig. 4 shows a side cross-section passing 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.

[0016] 4, the display device 1 includes a first substrate 2, a second substrate 7 facing the first substrate 2, and blue light-emitting elements 10, green light-emitting elements 20, and red light-emitting elements 30 between the first substrate 2 and the second substrate 7. The first substrate 2 and the second substrate 7 are formed, for example, across the display section DA and the frame section NA. Unless otherwise specified, in this disclosure, the direction from the first substrate 2 to each light-emitting element will be described as the "downward direction," and the direction from the second substrate 7 to each light-emitting element will be described as the "upward direction."

[0017] The first substrate 2 is a rigid substrate having optical transparency, such as a sapphire substrate containing sapphire having a C-plane on a first surface 2F located on the second substrate 7 side. Blue light-emitting elements 10, green light-emitting elements 20, and red light-emitting elements 30 are located on the first surface 2F. The second substrate 7 includes pixel circuits 71 that drive the blue light-emitting elements 10, green light-emitting elements 20, and red light-emitting elements 30 in a manner described below. The display device 1 also includes a bonding material 6 on a second surface 7F of the second substrate 7 located on the first substrate 2 side. The second substrate 7 is bonded to the blue light-emitting elements 10, green light-emitting elements 20, and red light-emitting elements 30 via the bonding material 6. The first substrate 2 and the second substrate 7 may be bonded together by a bonding material or the like around the periphery of each light-emitting element, such as a frame portion NA.

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

[0019] The number of layers located between the first substrate 2 and each of the blue light-emitting layer 13, the green light-emitting layer 23, and the red light-emitting layer 33 is different. Therefore, the distances L1, L2, and 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. Furthermore, the first surface 2F of the first substrate 2 and the second surface 7F of the second substrate 7 are substantially parallel. Therefore, the distances L4, L5, and 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.

[0020] The layered structure of each light-emitting element according to this embodiment will be described in detail with reference to Fig. 5. Fig. 5 is a schematic diagram illustrating the layered structure from the base layer 3 to the hole transport layer 5 of a blue light-emitting element 10.

[0021] The underlayer 3 is a layer for lattice matching between the sapphire crystal of the first substrate 2, which is a sapphire substrate, and the semiconductor crystal of the electron transport layer 4, which will be described later. The underlayer 3 includes, in order from the first substrate 2 side, a first buffer layer 81 and a second buffer layer 82. The first buffer layer 81 includes a semiconductor crystal epitaxially grown on the first surface 2F at a low temperature, for example, 600°C or less, and may include, for example, a gallium nitride crystal having a thickness of 40 nm. The second buffer layer 82 includes a semiconductor crystal epitaxially grown on the first buffer layer 81 and may include, for example, an undoped gallium nitride crystal having a thickness of 2 μm. The second buffer layer 82 may also be formed between the electron transport layer 4 and the hole transport layer 5.

[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 includes an n-type semiconductor crystal epitaxially grown on the second buffer layer 82, and may include, 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. The hole transport layer 5 includes, in order from the first substrate 2 side, 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.

[0024] Each of first p-type semiconductor layer 83 and second p-type semiconductor layer 84 includes a p-type semiconductor crystal formed by epitaxial growth. For example, first p-type semiconductor layer 83 may include an aluminum gallium nitride crystal with a thickness of 20 nm, and second p-type semiconductor layer 84 may include a gallium nitride crystal with a thickness of 120 nm. First p-type semiconductor layer 83 and second p-type semiconductor layer 84 may contain a Group 2 element such as Mg as a dopant.

[0025] Each of the first n-type semiconductor layer 85 and the second n-type semiconductor layer 86 includes 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 thickness of 25 nm, and the second n-type semiconductor layer 86 may include a gallium nitride crystal with a thickness of 400 nm. The first n-type semiconductor layer 85 and the second n-type semiconductor layer 86 may contain 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 contain light-emitting materials that emit light due to excitons generated by 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, respectively, emit blue light, green light, and red light, and may have, for example, a multiple quantum well structure.

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

[0028] <Display device: Light-emitting element: Electrode> 4, each of the blue light-emitting element 10, the green light-emitting element 20, and the red light-emitting element 30 includes 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 that is closest to the second substrate 7. Each anode is also electrically connected to a corresponding pixel circuit 71 via a bonding material 6 or the like, and a voltage is applied to each anode 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 each include a cathode 12, a cathode 22, and a cathode 32. Each cathode is electrically connected to a part of the lower surface of the hole transport layer 5 of each light-emitting element that is 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 each 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 the anode side. This reduces the need for a difference in work function between the material of each anode and the material of each cathode in the display device 1. For example, the material of each anode and the material of each cathode can be the same. Each anode and each cathode may have a stacked structure of, for example, Ti, Al, and Ti.

[0031] The display device 1 according to this embodiment is not limited to a configuration including a plurality of blue light-emitting elements 10, a plurality of green light-emitting elements 20, and a plurality of red light-emitting elements 30. For example, the display device 1 may be a monochromatic display device including a plurality of any of the blue light-emitting elements 10, the green light-emitting elements 20, and the red light-emitting elements 30.

[0032] The display device 1 may also include a wavelength conversion layer that converts the wavelength of light emitted from each light-emitting element, located closer to the light extraction side than each light-emitting element. For example, the display device 1 may include multiple blue light-emitting elements 10, and may include green and red conversion layers containing phosphors that emit green and red light, arranged in a planar view as wavelength conversion layers, at positions overlapping some of the blue light-emitting elements 10 in a planar view. Alternatively, the display device 1 may include multiple light-emitting elements that emit ultraviolet light. In this case, the display device 1 may include blue, green, and red conversion layers containing phosphors that emit blue, green, and red light, arranged in a planar view as wavelength conversion layers, at positions overlapping each light-emitting element in a planar view. This may enable the display device 1 to display a color image even if it includes multiple light-emitting elements that emit the same color.

[0033] <Light-emitting principle of light-emitting elements> The display device 1 generates a potential difference between the anode and cathode of each light-emitting element by individually applying a voltage to the anode of each light-emitting element by driving each pixel circuit 71 via a driver (not shown) or the like, thereby causing the display device 1 to inject holes from each anode into the hole transport layer 5 and electrons from each cathode into the electron transport layer 4.

[0034] Holes from each anode may tunnel through the second n-type semiconductor layer 86 and the first n-type semiconductor layer 85 of the hole transport layer 5 and be injected into the second p-type semiconductor layer 84. In this case, the display device 1 can efficiently inject charges from the electrodes in each light-emitting element while using the same material for each anode and each cathode. The display device 1 extracts light from each light-emitting element by injecting holes and electrons from the electrodes of each light-emitting element into the light-emitting layer, causing the light-emitting layer to emit light.

[0035] In blue light-emitting element 10, electrons from cathode 12 may be injected into blue light-emitting layer 13 via electron transport layer 4 immediately above blue light-emitting layer 13; in other words, they may not pass through underlayer 3. In green light-emitting element 20, electrons from cathode 22 may be injected into green light-emitting layer 23 via electron transport layer 4 immediately above green light-emitting layer 23; in other words, they may not pass through layers on the first substrate 2 side of electron transport layer 4. In red light-emitting element 30, electrons from cathode 32 may be injected into red light-emitting layer 33 via electron transport layer 4 immediately above red light-emitting layer 33; in other words, they may not pass through layers on the first substrate 2 side of electron transport layer 4.

[0036] <Light-emitting area of ​​light-emitting element> Each light-emitting element in a pixel P of a display device 1 according to this embodiment will be described in more detail with reference to Fig. 1. Fig. 1 is another enlarged plan view of the display device 1, and in particular is a further enlarged plan view of the pixel P shown in Fig. 3. Fig. 1 shows an extracted region of each light-emitting layer that emits light when a light-emitting element including that light-emitting layer is driven.

[0037] The blue light-emitting element 10, the green light-emitting element 20, and the red light-emitting element 30 each have a first light-emitting region 14, a second light-emitting region 24, and a third light-emitting region 34 as their light-emitting regions. The first light-emitting region 14, the second light-emitting region 24, and the third light-emitting region 34 each have a quadrangular shape in plan view, and in this embodiment, a diamond shape in particular. Therefore, the first light-emitting region 14, the second light-emitting region 24, and the third light-emitting region 34 each have four edge sides 15, 25, and 35 in plan view.

[0038] From the viewpoint of expanding each light-emitting region while maintaining the distance between two adjacent pixels P, it is desirable that the light-emitting region included in each pixel P be contained within an area whose outline in plan view is approximately a regular hexagon. By having each light-emitting region included in a pixel P have a quadrangular shape in plan view, it is possible to make the outline of the pixel P closer to an approximately regular hexagon. Furthermore, from the viewpoint of making the outline of the pixel P closer to an approximately regular hexagon, the outline of each light-emitting region included in the pixel P may be a rhombus, a parallelogram, or a trapezoid in plan view.

[0039] Note that the first light-emitting region 14, the second light-emitting region 24, and the third light-emitting region 34 may have the same shape in a plan view in order to simplify the mask pattern used in manufacturing each light-emitting element and to facilitate the manufacturing of the display device 1. In the present disclosure, "having the same shape" does not necessarily mean that the two components have shapes that are completely identical, but allows for differences such as manufacturing errors.

[0040] One edge of the light-emitting region of each light-emitting element faces one edge of the light-emitting region of another light-emitting element in a planar view. Here, the two opposing sides extend in a direction that intersects with each other in a planar view, in other words, the two sides are non-parallel in a planar view. For example, between edge 15 and edge 25, between edge 25 and edge 35, and between edge 35 and edge 15, the two opposing sides extend in a direction that intersects with each other in a planar view.

[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 this embodiment, the centroid of each light-emitting region may coincide with the intersection of two diagonals of the light-emitting region in a planar view. In this disclosure, the centroid of a region in a planar view refers to the position at which the first moment of area is zero when the region is viewed as a cross section in a planar view.

[0042] <Positional relationship of light-emitting areas> In order to explain the positional relationship of each light-emitting region within pixel P, a virtual figure T is shown by dotted lines in Figure 1. Figure T is an equilateral triangular figure with a centroid TC in plan view and has three vertices TV. Therefore, figure T is a figure with three-fold rotational symmetry around the centroid TC in plan view, and further, the three vertices TV are located at positions that are three-fold rotational symmetry with each other around the centroid TC in plan view.

[0043] In this embodiment, each of the centroids 16, 26, and 36 overlaps with the vertex TV of the figure T in a planar view. Therefore, each of the centroids 16, 26, and 36 is located at a position that is three-fold rotationally symmetric with respect to each other in a planar view.

[0044] 1 shows imaginary second light-emitting region 24A and third light-emitting region 34A with dotted lines in order to explain the positional relationship of each light-emitting region within pixel P. In plan view, second light-emitting region 24A and third light-emitting region 34A each coincide with a point located outside first light-emitting region 14, in particular, with a region obtained by rotating first light-emitting region 14 around centroid TC.

[0045] Here, the second light-emitting region 24 is located inside the second light-emitting region 24A in a planar view, specifically, coincides with a region obtained by rotating the second light-emitting region 24A around the centroid. The third light-emitting region 34 is located inside the third light-emitting region 34A in a planar view, specifically, coincides with a region obtained by rotating the third light-emitting region 34A around the centroid. This allows the display device 1 to easily achieve a configuration in which the two opposing sides between the end edge 15 and the end edge 25, and between the end edge 15 and the end edge 35, are non-parallel in a planar view.

[0046] <Reducing stray light> The effects achieved by the positional relationship of each light-emitting region will be described with reference to FIG.

[0047] Light from each light-emitting element of the display device 1 is extracted from each light-emitting layer in the direction toward the first substrate 2 or the second substrate 7, and is used for display in the display unit DA. Meanwhile, the light from each light-emitting element of the display device 1 includes light emitted from the side surface of each light-emitting layer, and this light includes a component propagating in the direction from one light-emitting element to another light-emitting element.

[0048] For example, it is difficult to use light propagating from each light-emitting element in a direction parallel to the display surface of the display device for display purposes, and the generation of such light leads to a decrease in the light extraction efficiency from each light-emitting element.

[0049] Furthermore, among light propagating from one light-emitting element to another, light propagating in a direction deviating from a direction parallel to the display surface of the display device may be extracted from a position overlapping the other light-emitting element in a planar view. This light is stray light extracted from a position different from the position where it was originally intended to be extracted, and it reduces the display quality of the display device. Furthermore, stray light may be multiple-reflected between light-emitting elements, which may further reduce the display quality of the display device.

[0050] In this embodiment, the two opposing sides between two adjacent light-emitting regions are non-parallel in plan view. Therefore, light emitted from the side surface of the light-emitting layer of one light-emitting element is refracted when it enters another light-emitting element. Furthermore, in this embodiment, a portion of each light-emitting region is located in a three-fold rotationally symmetric position in plan view. Therefore, the refracted light as described above can be propagated in a circular manner between three light-emitting elements including light-emitting regions whose portions are located in three-fold rotationally symmetric positions with respect to each other in plan view.

[0051] For example, as shown in FIG. 1, assume that light SL1 is emitted from the side surface of the blue light-emitting layer 13 in the direction toward the green light-emitting element 20. In this case, light SL1 incident on the green light-emitting element 20 is refracted at the edge 25 of the second light-emitting region 24 and propagates within the green light-emitting element 20 as light SL2. Furthermore, light SL2 is refracted again at the other edge 25 of the second light-emitting region 24 and becomes light SL3 that propagates toward the red light-emitting element 30. By repeating the above process, light emitted from the side surface of any of the light-emitting layers in the pixel P propagates in a circular manner within the pixel P in a planar view. Therefore, the display device 1 prevents this light from being extracted to the outside of the pixel P and becoming stray light.

[0052] As described above, the display device 1 according to this embodiment reduces the extraction of light emitted from the side surface of the light-emitting layer of a certain light-emitting element from a position where the light overlaps with a distant light-emitting element in a planar view. Therefore, the display device 1 reduces the occurrence of stray light and improves display quality. Furthermore, the display device 1 according to this embodiment relatively increases the intensity of light in the direction from each light-emitting layer toward the display surface, improving the extraction efficiency of light from each light-emitting element.

[0053] In particular, in this embodiment, the centroids 16, 26, and 36 are located at positions that are three-fold rotationally symmetric with each other in a plan view, which increases 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 in a plan view of the display device 1, thereby further reducing stray light.

[0054] <Relationship between the side surface of the light-emitting layer and the surface of the substrate> The light-emitting element according to this embodiment will be described in more detail with reference to Fig. 6. Fig. 6 is another schematic side cross-sectional view of the display device 1 according to this embodiment. In particular, Fig. 6 is a cross-sectional view taken along the arrows VI-VI shown in Fig. 1, in other words, a schematic side cross-sectional view of the display device 1 taken along a cross section passing through the red light-emitting element 30.

[0055] The outer surface of the red light-emitting element 30 is substantially flush with the outer surface 13S of the blue light-emitting layer 13, the outer surface 23S of the green light-emitting layer 23, and the outer surface 33S of the red light-emitting layer 33. The outer surface of the red light-emitting element 30 forms a first angle A1 with the first surface 2F of the first substrate 2 and 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 have a truncated cone-shaped portion with its tip facing 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] The blue light-emitting element 10 and the green light-emitting element 20 have the same configuration as the red light-emitting element 30, except that a portion 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 as well, the outer 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] With the above configuration, display device 1 can reduce the component of light emitted from the outer surface of each light-emitting layer that propagates in a direction parallel to first surface 2F or second surface 7F, thereby improving the light extraction efficiency from each light-emitting element. Furthermore, display device 1 reduces the long-distance propagation of stray light from the outer surface of each light-emitting element, particularly the outer surface of each light-emitting layer, thereby improving display quality.

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

[0060] 7, in the method for manufacturing the display device 1, first, a first substrate 2 is prepared (step S1). In step S1, a first substrate 2 is prepared with a first surface 2F facing upward. In step S1, a large first substrate 2 may be prepared, and in this case, in the method for manufacturing the display device 1, the first substrate 2 may be later cut together with the second substrate 7 to separate into individual display devices 1.

[0061] Next, the underlayer 3 (step S2), the electron transport layer 4 (step S3), the light-emitting layer (step S4), and the hole transport layer 5 (step S5) are sequentially formed on the first surface 2F of the first substrate 2. The formation of each layer may be performed by the method described above. Furthermore, if the display device 1 has multiple light-emitting layers, steps S3 to S5 may be repeated the same number of times as the number of light-emitting layers. As a result, a stacked structure of multiple semiconductor layers is formed on the first substrate 2, as shown in step S5 of FIG. 8.

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

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

[0064] Furthermore, all of the semiconductor layer on the first substrate 2 is removed between the positions where the light-emitting elements are formed. In step S6, the angle formed between the end face of each layer and the first surface 2F, in other words, the first angle A1, may be controlled by changing the patterning and etching conditions for removing the semiconductor layer between the positions where the light-emitting elements are formed. As a result, the structure shown in step S8 of FIG. 8 is formed. Note that the removal of the semiconductor layer between the positions where the light-emitting elements are formed may be performed after the formation of the electrodes, which will be described later.

[0065] Next, electrodes including an anode and a cathode of each light-emitting element are formed (step S7). For example, in step S7, a resist pattern is formed 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, and then metal thin films of Ti, Al, and Ti are formed in this order by evaporation or the like. Next, the resist pattern is removed to pattern the formed metal thin films. As a result, as shown in step S7 of FIG. 8, 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-described manufacturing method can be performed when the materials of each anode and each cathode are the same, eliminating the need to separately perform the process of forming each anode and the process of forming each cathode, thereby further simplifying the manufacturing method of the display device 1.

[0066] In this manner, a first laminate LA1 is formed in which semiconductor layers and electrodes are formed on the first substrate 2. Thereafter, in this embodiment, a step of forming a protective layer that 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 may be carried out.

[0067] In the manufacturing method of the display device 1 according to this embodiment, aside from forming the first laminate LA1 described above, a second substrate 7 is prepared (step S8). In step S8, the second substrate 7 is prepared with the second surface 7F facing upward. In step S8, pixel circuits 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 may be formed, for example, by depositing a photosensitive resin and patterning the photosensitive resin by photolithography. In step S8, the height of each bonding material 6 is designed taking into account the height of each layer formed in the first laminate LA1 to be attached to the second laminate LA2 described below. In step S8, contact portions may be formed in the bonding material 6 to realize electrical connection between the pixel circuit 71 and the anode, and between the auxiliary electrode and the cathode.

[0069] In this way, a second laminate LA2 in which the bonding material 6 is formed on the second substrate 7 is formed.

[0070] After completing steps S7 and S9, in the manufacturing method of the display device 1 according to this embodiment, the first laminate LA1 and the second laminate LA2 are bonded together (step S10). In step S10, for example, the first surface 2F and the second surface 7F are placed face to face, and the first substrate 2 and the second substrate 7 are joined together with an adhesive material (not shown), thereby bonding the first laminate LA1 and the second laminate LA2 together. This completes the manufacturing method of the display device 1. After bonding the first laminate LA1 and the second laminate LA2 together, the first substrate 2 may be peeled off from each light-emitting element by a laser lift-off method or the like.

[0071] <Evaluation of the optical characteristics of display devices> Display devices according to the examples and comparative examples were fabricated, and the optical characteristics of each display device were evaluated.

[0072] The display device according to the example has the same configuration as the display device 1 according to the present embodiment and was manufactured by the same method as the manufacturing method of the display device 1 described above. The display device according to the comparative example differs from the display device 1 according to the present embodiment only in the shape of the light-emitting region of each light-emitting element in plan view. Each light-emitting region of the display device according to the comparative example is rectangular and arranged in a matrix direction in plan view. Furthermore, in the display device according to the comparative example, two opposing sides of two adjacent light-emitting regions extend approximately parallel to each other.

[0073] In each of the example and comparative example, only one of the light-emitting elements of 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. 10 shows graph G1, which shows the measurement results for the display device of the example, and graphs G2 and G3, which show the measurement results for the display devices of the comparative example. In each graph shown in Fig. 10, the vertical axis represents the distance (unit: μm) in a plan view from the centroid of the light-emitting area of ​​the light-emitting element that was made to emit light, and the horizontal axis represents the brightness (unit: W / μm 2 ) Graphs G1 and G2 show the measurement results at measurement plane MA shown in FIG. 4 for the display devices according to the example and comparative example, respectively, and graph G3 shows the measurement results at measurement plane MB shown in FIG. 4 for the display device according to the comparative example. Measurement plane MA is located 200 nm inward from the first surface 2F of the first substrate 2, and is located at the interface between the first surface 2F of the first substrate 2 and each light-emitting element. Note that the data in each graph shown in FIG. 10 is plotted on a scale that can indicate maximum brightness, and that the scale of each axis is different for each graph.

[0074] As is clear from a comparison of the graphs in Figure 10, the display device according to the example has higher brightness near the centroid of the light-emitting region of the light-emitting element that has been made to emit light, compared to the display device according to the comparative example, and the brightness drops sharply at a position about 10 μm away from the centroid. Furthermore, the display device according to the example has almost no brightness at a position more than 100 μm away from the centroid, compared to the display device according to the comparative example. This shows that the display device according to the example reduces stray light extracted at a position away from the light-emitting region of the light-emitting element that has been made to emit light, compared to the display device according to the comparative example.

[0075] [Embodiment 2] <Modification of the shape of the light-emitting region> A display device according to another embodiment will be described with reference to Fig. 11. Fig. 11 is an enlarged plan view of the display device 1 according to this embodiment, showing an enlarged view of the same area as that shown in Fig. 1.

[0076] The display device 1 according to this embodiment has the same configuration as the display device 1 according to the previous embodiment, except for the positions at which the light-emitting elements are formed. In this embodiment, particularly in this embodiment, centroids 16, 26, and 36 are located at positions different from vertices TV of figure T in a planar view. However, each vertex TV of figure T overlaps with a portion of each of the first light-emitting region 14, the second light-emitting region 24, and the third light-emitting region 34 in a planar view. The display device 1 according to this embodiment can be manufactured by a manufacturing method of the display device 1 according to the previous embodiment, with a modification being made to the etching position of the semiconductor layer in step S6.

[0077] As a result, in the display device 1 according to this embodiment, some portions of the first light-emitting region 14, the second light-emitting region 24, and the third light-emitting region 34 are located in positions that are three-fold rotationally symmetric with respect to each other. Therefore, for the same reasons as those described in the previous embodiment, the display device 1 according to this embodiment reduces the propagation of stray light between light-emitting elements, thereby improving display quality.

[0078] [Embodiment 3] <Modifications of the Shape of the Light-Emitting Element> A display device according to another embodiment will be described with reference to Fig. 12. Fig. 12 is a schematic cross-sectional side view of the display device 1 according to this embodiment, taken at the same position as the cross-sectional side view shown in Fig. 6. A cross section is shown.

[0079] The display device 1 according to this embodiment has the same configuration as the display device 1 according to the previous embodiments, except that the first angle A1 is an obtuse angle and the second angle is an acute angle. In this embodiment, each light-emitting element of the display device 1 may have a frustum shape with its tip facing the second substrate 7. The display device 1 according to this embodiment can be manufactured by a manufacturing method similar to that of the previous embodiment, but with modified conditions for etching the semiconductor layer in step S6 and for forming the bonding material 6 in step S9. For the same reasons as those described above, the display device 1 according to this embodiment improves the light extraction efficiency from each light-emitting element and reduces the long-distance propagation of stray light on the outer surface of each light-emitting layer, thereby improving display quality.

[0080] [Embodiment 4] <Unevenness of the light-emitting area> A display device according to another embodiment will be described with reference to Fig. 13. Fig. 13 is an enlarged plan view of the display device 1 according to this embodiment, showing an enlarged view of the same area as that shown in Fig. 1.

[0081] The display device 1 according to this embodiment has the same configuration as the display device 1 according to the above-described embodiments, except for the shape of the light-emitting region of each light-emitting element in a plan view. The light-emitting region of any light-emitting element according to this embodiment has at least one of a convex portion that protrudes outward from the surrounding area in a plan view and a concave portion that is recessed inward from the surrounding area in a plan view.

[0082] 13, the first light-emitting region 14 has convex portions 18 and concave portions 19, the second light-emitting region 24 has convex portions 28 and concave portions 29, and the third light-emitting region 34 has convex portions 38 and concave portions 39. The display device 1 according to this embodiment can be manufactured by a manufacturing method similar to that of the previous embodiment, except that the etching position of the semiconductor layer in step S6 is changed.

[0083] In this embodiment, the edge of each light-emitting region is located on a line segment connecting the vertices of the light-emitting regions in a planar view. Therefore, in this embodiment, too, between edge 15 and edge 25, between edge 25 and edge 35, and between edge 35 and edge 15, the two opposing sides extend in intersecting directions in a planar view. For the same reasons as described above, the display device 1 according to this embodiment reduces the propagation of stray light between light-emitting elements, thereby improving display quality.

[0084] Furthermore, each light-emitting region according to this embodiment has a recessed portion and a protruding portion. Therefore, in the display device 1 according to this embodiment, the extension directions of the facing side surfaces of two adjacent light-emitting layers are further differentiated. Therefore, for the same reason as described above, the display device 1 according to this embodiment further reduces the propagation of stray light between light-emitting elements, thereby improving display quality.

[0085] [Embodiment 5] <Modification of the arrangement of light-emitting elements> A display device according to another embodiment will be described with reference to Fig. 14. Fig. 14 is an enlarged plan view of the display device 1 according to this embodiment, showing an enlarged view of the same area as that shown in Fig. 3.

[0086] The display device 1 according to this embodiment differs in configuration from the display device 1 according to the previous embodiments, except for the arrangement of the light-emitting elements. In particular, in the display device 1 according to this embodiment, the positional relationship in plan view between the blue light-emitting elements 10, the green light-emitting elements 20, and the red light-emitting elements 30 is the same in all pixels P. The display device 1 according to this embodiment can be manufactured by a manufacturing method of the display device 1 according to the previous embodiment, with the etching position of the semiconductor layer changed in step S6.

[0087] However, even 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 that includes the blue light-emitting element 10. The blue light-emitting element 10 is also adjacent to the green light-emitting element 40 and the red light-emitting element 50 included in a pixel P different from the pixel P that includes the blue light-emitting element 10. Furthermore, in this embodiment, the light-emitting elements are arranged so that the emission colors of two adjacent light-emitting elements are different. This prevents the display device 1 from deteriorating in display quality due to the apparent connection of the light-emitting areas of two adjacent light-emitting elements, which effectively reduces resolution.

[0088] [Embodiment 6] <Wearable devices> 15 and 16 are schematic cross-sectional views showing examples of the configuration of a wearable device according to this embodiment. A wearable device 90 shown in Fig. 15 and a wearable device 91 shown in Fig. 16 each include a light-emitting device 92. The light-emitting device 92 has a plurality of pixels P according to the embodiments described above, and each pixel P includes a blue light-emitting element 10, a green light-emitting element 20, and a red light-emitting element 30 according to the embodiments described above.

[0089] Each of wearable device 90 and wearable device 91 can be attached to the body or another device. As shown in FIG. 15 , in wearable device 90, light from pixel P may directly enter a human eye or a sensor. As shown in FIG. 16 , in wearable device 91, light from pixel P may enter via a projection object 93. Each of wearable device 90 and wearable device 91 can also superimpose an external world 94 on the image of light-emitting device 92.

[0090] <Summary> A display device according to a first aspect of the present disclosure comprises a first light-emitting element having a first light-emitting region, a second light-emitting element adjacent to the first light-emitting element and having a second light-emitting region, and a third light-emitting element adjacent to both the first light-emitting element and the second light-emitting element and having a third light-emitting region, wherein, in a planar view, any portion of the first light-emitting region, the second light-emitting region, and the third light-emitting region are located at positions that are three-fold rotationally symmetric with respect to each other, and between the first light-emitting region and the second light-emitting region, between the second light-emitting region and the third light-emitting region, and between the third light-emitting region and the first light-emitting region, two sides that face each other in a planar view extend in intersecting directions.

[0091] In the display device according to aspect 2 of the present disclosure, in the above aspect 1, the centroids of the first light-emitting region, the second light-emitting region, and the third light-emitting region may be located at positions that are three-fold rotationally symmetric with each other when viewed in a plan view.

[0092] In the display device according to Aspect 3 of the present disclosure, in Aspect 1 or 2 above, the first light-emitting region, the second light-emitting region, and the third light-emitting region may have the same shape in a plan view.

[0093] In the display device according to aspect 4 of the present disclosure, in the above-described aspect 3, in a planar view, at least one of the first light-emitting region, the second light-emitting region, and the third light-emitting region may coincide with a region obtained by rotating any of the other light-emitting regions around the outside of the other light-emitting region and then rotating the other light-emitting region around the inside of the other light-emitting region.

[0094] In a display device according to a fifth aspect of the present disclosure, in any one of the first to fourth aspects, the first light-emitting region, the second light-emitting region, and the third light-emitting region may each have a quadrangular shape in a plan view.

[0095] In a display device according to aspect 6 of the present disclosure, in aspect 5 above, the first light-emitting region, the second light-emitting region, and the third light-emitting region may each be a rhombus, a parallelogram, or a trapezoid when viewed in a plane.

[0096] A display device according to aspect 7 of the present disclosure may be any of aspects 1 to 6 above, 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 an eighth aspect of the present disclosure may be the display device of the seventh aspect described above, further including a first substrate on which the first light-emitting element, the second light-emitting element, and the third light-emitting element are located.

[0098] A display device according to aspect 9 of the present disclosure may be such that, in aspect 8 above, a first angle formed between a first surface of the first substrate, which is the surface facing the first light-emitting element, the second light-emitting element, and the third light-emitting element, and a side surface of any 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] In a display device according to aspect 10 of the present disclosure, in aspect 8 or 9 above, at least two of the first light-emitting layer, the second light-emitting layer, and the third light-emitting layer may be at different distances from each other to a first surface of the first substrate, which is the surface on the side of the first light-emitting element, the second light-emitting element, and the third light-emitting element.

[0100] The display device according to aspect 11 of the present disclosure may be any of aspects 7 to 10 above, further comprising a second substrate bonded to each of the first light-emitting element, the second light-emitting element, and the third light-emitting element via a bonding material.

[0101] In the display device according to aspect 12 of the present disclosure, in the above-mentioned aspect 11, the second angle formed between the second surface of the second substrate, which is the surface on the bonding material side, and any side of the first light-emitting layer, the second light-emitting layer, or the third light-emitting layer may be an acute angle or an obtuse angle.

[0102] A display device according to a thirteenth aspect of the present disclosure is the display device of the eleventh or twelfth aspect above, wherein the second substrate may include pixel circuits that drive the first light-emitting element, the second light-emitting element, and the third light-emitting element, respectively.

[0103] In the display device according to aspect 14 of the present disclosure, in any of aspects 11 to 13 above, at least two of the first light-emitting layer, the second light-emitting layer, and the third light-emitting layer may have different distances from each other to the second surface of the second substrate, which is the surface on the bonding material side.

[0104] A display device according to aspect 15 of the present disclosure is any of aspects 1 to 14 above, wherein, in a planar view, at least one of the first light-emitting region, the second light-emitting region, and the third light-emitting region may have at least one of a convex portion that protrudes outward from the surrounding area in a planar view and a concave portion that is recessed inward from the surrounding area in a planar view.

[0105] A display device according to aspect 16 of the present disclosure may be any of aspects 1 to 15 above, wherein the first light-emitting element emits first light, the second light-emitting element emits second light having a wavelength different from that of the first light, and the third light-emitting element emits third light having a wavelength different from that of both the first light and the second light.

[0106] A display device according to aspect 17 of the present disclosure may, in accordance with aspect 16 above, include a fourth light-emitting element adjacent to the first light-emitting element in a planar view and emitting the second light, and a fifth light-emitting element adjacent to the first light-emitting element in a planar view and emitting the third light.

[0107] The display device according to an eighteenth aspect of the present disclosure may be the display device of the sixteenth or seventeenth aspect, wherein the first light is blue light, the second light is green light, and the third light is red light.

[0108] A display device according to aspect 19 of the present disclosure may be a wearable device having a light-emitting device including the first light-emitting element, the second light-emitting element, and the third light-emitting element in any of aspects 1 to 18 above.

[0109] The present disclosure is not limited to the above-described embodiments, 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 disclosure. Furthermore, new technical features can be formed by combining the technical means disclosed in each embodiment. [Explanation of symbols]

[0110] 1 Display device 2 First board 2F 1st surface 6 Bonding material 7 Second board 7F 2nd surface 10 Blue light-emitting element (first light-emitting element) 13 Blue light-emitting layer (first light-emitting layer) 14 First 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 luminous area) 30 Red light-emitting element (third light-emitting element) 33 Red light-emitting layer (third light-emitting layer) 34 Third light-emitting area 36 Centroid (of the third luminous region) 71 Pixel circuit A1 First angle A2 2nd angle

Claims

1. a first light-emitting element having a first light-emitting region, a second light-emitting element adjacent to the first light-emitting element and having a second light-emitting region, and a third light-emitting element adjacent to both the first light-emitting element and the second light-emitting element and having a third light-emitting region; In a plan view, any portion of the first light-emitting region, the second light-emitting region, and the third light-emitting region is located at a position that is three-fold rotationally symmetric with respect to each other; Between the first light-emitting region and the second light-emitting region, between the second light-emitting region and the third light-emitting region, and between the third light-emitting region and the first light-emitting region, two sides facing each other in a planar view extend in intersecting directions, In a plan view, the first light-emitting region, the second light-emitting region, and the third light-emitting region have the same shape, In a plan view, at least one of the first light-emitting region, the second light-emitting region, and the third light-emitting region coincides with a region obtained by rotating any one of the other light-emitting regions around an outer centroid, which is a point located outside the other light-emitting region, and rotating the other light-emitting region around an inner centroid, which is a point located inside the rotated light-emitting region; In a plan view, the inner centroids of the first light-emitting region, the second light-emitting region, and the third light-emitting region are located at positions of three-fold rotational symmetry around the outer centroid, A display device in which, in a planar view, at least one of the first light-emitting region, the second light-emitting region, and the third light-emitting region is rotated around the inner centroid so that two opposing sides between an end edge of at least one of the first light-emitting region, the second light-emitting region, and the third light-emitting region and an end edge of any other light-emitting region are non-parallel.

2. The display device according to claim 1 , wherein the first light-emitting region, the second light-emitting region, and the third light-emitting region each have a rectangular shape in a plan view.

3. 3. The display device according to claim 2, wherein, in a plan view, each of the first light-emitting region, the second light-emitting region, and the third light-emitting region is one of a rhombus, a parallelogram, and a trapezoid.

4. The display device of claim 1 , 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.

5. The display device according to claim 4 , comprising a first substrate on which the first light-emitting element, the second light-emitting element, and the third light-emitting element are located.

6. 6. The display device according to claim 5, wherein a first angle formed between a first surface of the first substrate, which is the surface on which the first light-emitting element, the second light-emitting element, and the third light-emitting element are disposed, and a side surface of any 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.

7. 6. The display device of claim 5, 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, which is the surface on the side of the first light-emitting element, the second light-emitting element, and the third light-emitting element.

8. The display device according to claim 4 , further comprising a second substrate bonded to each of the first light-emitting element, the second light-emitting element, and the third light-emitting element via a bonding material.

9. 9. The display device according to claim 8, wherein a second angle formed between a second surface of the second substrate, which is the surface on the bonding material side, and a side surface of any one 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 , wherein the second substrate includes pixel circuits that drive the first light-emitting element, the second light-emitting element, and the third light-emitting element, respectively.

11. 9. The display device according to claim 8, 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, which is the surface on the bonding material side.

12. 2. The display device according to claim 1, wherein, in a planar view, at least one of the first light-emitting region, the second light-emitting region, and the third light-emitting region has at least one of a convex portion that protrudes outward from its surroundings in a planar view and a concave portion that is recessed inward from its surroundings in a planar view.

13. 2. The display device according to claim 1, 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.

14. 14. The display device according to claim 13, comprising: a fourth light-emitting element adjacent to the first light-emitting element in a planar view and emitting the second light; and a fifth light-emitting element adjacent to the first light-emitting element in a planar view and emitting the third light.

15. 14. The display device of claim 13, wherein the first light is blue light, the second light is green light, and the third light is red light.

16. The display device according to claim 1 , which is a wearable device comprising a light-emitting device including the first light-emitting element, the second light-emitting element, and the third light-emitting element.

Images