Light-emitting device and display device

Abstract

A light-emitting element (5R･5G･5B) comprises: a first electrode (22) that includes a first conductive layer (22a) having a flat surface (22S) that reflects visible light as an upper surface, and a second conductive layer (22b) which is provided on the flat surface (22S) and is transmissive to the visible light, the second conductive layer (22b) comprising a first region having a first thickness, a second region positioned around the first region and having a second thickness greater than the first thickness, and a third region positioned around the second region and having a third thickness greater than the second thickness; a function layer (24R･24G･24B) and a second electrode (25) formed on the function layer (24R･24G･24B), the function layer (24R･24G･24B) being formed on the second conductive layer (22b) along the shape of the second conductive layer (22b) and comprising at least a light-emitting layer, the second electrode (25) being transmissive to the visible light; and an edge cover (23) which comprises at least one of a material that scatters the visible light and a material that blocks the visible light, covers at least a part of the edge of the first electrode (22), and is formed higher than the second electrode (25).

Description

[Technical field]

[0001] The present disclosure relates to a light-emitting element and a display device. [Background technology]

[0002] In recent years, various display devices equipped with light-emitting elements have been developed. In particular, display devices equipped with OLEDs (Organic Light Emitting Diodes) or QLEDs (Quantum dot Light Emitting Diodes) have attracted a great deal of attention because of their ability to achieve low power consumption, thinness, high image quality, and the like.

[0003] In the field of such display devices, the light interference effect between electrodes is used to improve color purity and luminous efficiency, so it is known that when a user views the display area of ​​the display device from an oblique direction with a large viewing angle, a color change occurs due to an optical path difference compared to when the user views the display area of ​​the display device from the front.

[0004] Patent Document 1 describes forming an anode electrode in an inclined or bowl-shaped form to improve the viewing angle dependency of color change in a display device. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] International Publication "WO2019 / 188416 A1" Summary of the Invention [Problem to be solved by the invention]

[0006] However, even in a configuration in which the anode electrode is formed in an inclined or bowl-shaped shape as in the display device described in Patent Document 1, when a user views the display area of ​​the display device from an oblique direction with a large viewing angle, there still exists light with a color change due to an optical path difference compared to when the user views the display area of ​​the display device from the front. In the case of the display device described in Patent Document 1, such light is guided directly to the user's eyes, so there is also a problem that the color change when the user views the display area of ​​the display device from an oblique direction with a large viewing angle cannot be improved.

[0007] One aspect of the present disclosure has been made in consideration of the above-mentioned problems, and aims to provide a light-emitting element and a display device in which the viewing angle dependency of color change, including the color change when viewed from an oblique direction with a large viewing angle, is improved. [Means for solving the problem]

[0008] In order to solve the above problems, the light-emitting device of the present disclosure has the following features: a first electrode including a first conductive layer having a plane as an upper surface that reflects visible light, and a second conductive layer provided on the plane and transmitting the visible light, the second conductive layer including a first region having a first thickness, a second region located around the first region and having a second thickness that is thicker than the first thickness, and a third region located around the second region and having a third thickness that is thicker than the second thickness; a functional layer including at least a light-emitting layer formed on the second conductive layer along a shape of the second conductive layer, and a second electrode that transmits the visible light and is formed on the functional layer; The light-emitting element further includes an edge cover that includes at least one of the visible light scattering material and the visible light blocking material, covers at least a portion of an end of the first electrode, and is formed higher than the second electrode. Effect of the Invention

[0009] One embodiment of the present disclosure can provide a light-emitting element and a display device in which the viewing angle dependency of color change, including the color change when viewed from an oblique direction with a large viewing angle, is improved. [Brief description of the drawings]

[0010] [Figure 1] 1 is a plan view showing a schematic configuration of a display device according to a first embodiment. [Diagram 2] 1 is a cross-sectional view showing a schematic configuration of a substrate including a transistor provided in the display device of Embodiment 1. FIG. [Diagram 3] (a) is a cross-sectional view showing the schematic configuration of a red light-emitting element provided in the display device of embodiment 1, (b) is a cross-sectional view showing the schematic configuration of a green light-emitting element provided in the display device of embodiment 1, and (c) is a cross-sectional view showing the schematic configuration of a blue light-emitting element provided in the display device of embodiment 1. [Figure 4] FIG. 1(a) is a diagram showing a schematic configuration of edge covers provided on each of the red light-emitting elements, green light-emitting elements, and blue light-emitting elements of the display device of embodiment 1, and FIG. 1(b), (c), (d), and (e) are diagrams showing schematic configurations of other edge covers that can be provided on each of the red light-emitting elements, green light-emitting elements, and blue light-emitting elements of the display device of embodiment 1. [Diagram 5] FIG. 11 is a cross-sectional view showing a schematic configuration of a display device according to a second embodiment. [Figure 6] FIG. 11 is a cross-sectional view showing a schematic configuration of a display device according to a third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] The following describes an embodiment of the present invention with reference to Figures 1 to 6. For the sake of convenience, components having the same functions as those described in a specific embodiment are denoted by the same reference numerals, and descriptions thereof may be omitted.

[0012] [Embodiment 1] FIG. 1 is a plan view showing a schematic configuration of a display device 1 according to the first embodiment.

[0013] As shown in Fig. 1, the display device 1 includes a frame area NDA and a display area DA. The display area DA of the display device 1 includes a plurality of pixels PIX, each of which includes a red sub-pixel RSP, a green sub-pixel GSP, and a blue sub-pixel BSP. In this embodiment, a case in which one pixel PIX is composed of a red sub-pixel RSP, a green sub-pixel GSP, and a blue sub-pixel BSP will be described as an example, but the present invention is not limited to this. For example, one pixel PIX may include sub-pixels of other colors in addition to the red sub-pixel RSP, the green sub-pixel GSP, and the blue sub-pixel BSP.

[0014] FIG. 2 is a cross-sectional view showing a schematic configuration of a substrate 2 including a transistor TR provided in the display device 1 of the first embodiment.

[0015] 2, in the substrate 2 including the transistor TR provided in the display device 1, a barrier layer 3 and a thin film transistor layer 4 including the transistor TR are provided on the substrate 12 in this order from the substrate 12 side. A first electrode 22 is provided on a surface 2S of the substrate 2 including the transistor TR.

[0016] The substrate 12 may be, for example, a resin substrate made of a resin material such as polyimide, or a glass substrate. In this embodiment, in order to make the display device 1 a flexible display device, a case where a resin substrate made of a resin material such as polyimide is used as the substrate 12 will be described as an example, but the present invention is not limited to this. When the display device 1 is a non-flexible display device, a glass substrate can be used as the substrate 12.

[0017] The barrier layer 3 is a layer that prevents foreign substances such as water and oxygen from penetrating into the transistor TR and the light-emitting elements of each color described later, and can be composed of, for example, a silicon oxide film, a silicon nitride film, or a silicon oxynitride film, or a laminate film of these, formed by a chemical vapor deposition (CVD) method.

[0018] The transistor TR portion of the thin film transistor layer 4 including the transistor TR includes the semiconductor film SEM and the doped semiconductor films SEM' and SEM'', an inorganic insulating film 16, a gate electrode G, an inorganic insulating film 18, an inorganic insulating film 20, a source electrode S, a drain electrode D, and a planarization film 21, and the portion of the thin film transistor layer 4 including the transistor TR other than the transistor TR portion includes the inorganic insulating film 16, the inorganic insulating film 18, the inorganic insulating film 20, and the planarization film 21.

[0019] The semiconductor films SEM, SEM', and SEM'' may be made of, for example, low temperature polysilicon (LTPS) or an oxide semiconductor (for example, an In-Ga-Zn-O based semiconductor). In this embodiment, the transistor TR has a top gate structure as an example, but is not limited to this and the transistor TR may have a bottom gate structure.

[0020] The gate electrode G and the source electrode S and drain electrode D can be formed of a single layer or a multilayer film of a metal containing at least one of aluminum, tungsten, molybdenum, tantalum, chromium, titanium, and copper, for example.

[0021] The inorganic insulating films 16, 18 and 20 can be composed of, for example, a silicon oxide film, a silicon nitride film, a silicon oxynitride film, or a laminate film of these films formed by a chemical vapor deposition (CVD) method.

[0022] The planarizing film 21 can be made of a coatable organic material, such as polyimide or acrylic.

[0023] As shown in FIG. 2, a control circuit including transistors TR that control each of the plurality of first electrodes 22 is provided in the thin film transistor layer 4 including the transistors TR.

[0024] (a) of Figure 3 is a cross-sectional view showing the schematic configuration of a red light-emitting element 5R provided in the display device 1 of embodiment 1, (b) of Figure 3 is a cross-sectional view showing the schematic configuration of a green light-emitting element 5G provided in the display device 1 of embodiment 1, and (c) of Figure 3 is a cross-sectional view showing the schematic configuration of a blue light-emitting element 5B provided in the display device 1 of embodiment 1.

[0025] The red sub-pixel RSP shown in Figures 1 and 2 is provided with a red light-emitting element 5R, the green sub-pixel GSP shown in Figures 1 and 2 is provided with a green light-emitting element 5G, and the blue sub-pixel BSP shown in Figures 1 and 2 is provided with a blue light-emitting element 5B.

[0026] As shown in FIG. 3(a), the red light emitting element 5R includes, from the substrate 2 side including the transistor TR shown in FIG. 2, a first electrode 22, a functional layer 24R including a red light emitting layer, and a second electrode 25, in this order.

[0027] As shown in FIG. 3(b), the green light emitting element 5G includes, in this order from the substrate 2 side including the transistor TR shown in FIG. 2, a first electrode 22, a functional layer 24G including a green light emitting layer, and a second electrode 25.

[0028] As shown in (c) of Figure 3, the blue light emitting element 5B includes, in this order from the substrate 2 side including the transistor TR shown in Figure 2, a first electrode 22, a functional layer 24B including a blue light emitting layer, and a second electrode 25.

[0029] In this embodiment, the red light-emitting element 5R, the green light-emitting element 5G, and the blue light-emitting element 5B are described using an example of a forward stack structure in which the first electrode 22 is an anode and the second electrode 25 is a cathode, but this is not limited to this, and they may also have an inverted stack structure in which the first electrode 22 is a cathode and the second electrode 25 is an anode.

[0030] When the red light-emitting element 5R, the green light-emitting element 5G, and the blue light-emitting element 5B have the above-mentioned forward stack structure, each of the functional layer 24R including a red light-emitting layer, the functional layer 24G including a green light-emitting layer, and the functional layer 24B including a blue light-emitting layer can include, in this order from the first electrode 22 side, a hole injection layer, a hole transport layer, a corresponding light-emitting layer, an electron transport layer, and an electron injection layer between the first electrode 22 and the second electrode 25. Note that in the functional layer, one or more layers other than the corresponding light-emitting layer can be omitted as appropriate.

[0031] Furthermore, when the red light-emitting element 5R, the green light-emitting element 5G, and the blue light-emitting element 5B have the above-mentioned inverted stack structure, each of the functional layer 24R including a red light-emitting layer, the functional layer 24G including a green light-emitting layer, and the functional layer 24B including a blue light-emitting layer can include, in this order from the first electrode 22 side, an electron injection layer, an electron transport layer, a corresponding light-emitting layer, a hole transport layer, and a hole injection layer between the first electrode 22 and the second electrode 25. Note that in the functional layer, one or more layers other than the corresponding light-emitting layer can be omitted as appropriate.

[0032] When the red light-emitting element 5R, the green light-emitting element 5G, and the blue light-emitting element 5B shown in Figure 3 have the above-mentioned forward stack structure, the first electrode 22, which is the anode, is formed from an electrode material that reflects visible light, and the second electrode 25, which is the cathode, is formed from an electrode material that transmits visible light, thereby realizing a top-emission type light-emitting element.

[0033] Furthermore, when the red light-emitting element 5R, the green light-emitting element 5G, and the blue light-emitting element 5B shown in FIG. 3 have the above-mentioned inverted stack structure, the first electrode 22, which is the cathode, is formed from an electrode material that reflects visible light, and the second electrode 25, which is the anode, is formed from an electrode material that transmits visible light, thereby realizing a top-emission type light-emitting element.

[0034] The red light-emitting element 5R shown in (a) of Figure 3 includes a first conductive layer 22a having a plane 22S that reflects visible light as an upper surface, and a second conductive layer 22b provided on the plane 22S and transmitting the visible light, the first electrode 22 including a central region (first region) having a first thickness, a peripheral region (second region) located around the central region (first region) and having a second thickness thicker than the first thickness, and an end region (third region) located around the peripheral region (second region) and having a third thickness thicker than the second thickness, a functional layer 24R including at least a red light-emitting layer formed on the second conductive layer 22b along the shape of the second conductive layer 22b, and a second electrode 25 that transmits the visible light and is formed on the functional layer 24R, and an edge cover 23 that includes at least one of a material scattering the visible light and a material blocking the visible light, covers at least a portion of an end of the first electrode 22, and is formed higher than the second electrode 25.

[0035] In this embodiment, the edge cover 23 can be formed of a photosensitive resin material containing a scattering material that scatters visible light, and the photosensitive resin material can be patterned into a predetermined shape by performing exposure and development. Note that since the photosensitive resin material contains a scattering material that scatters visible light, it is preferable to use a material that is photosensitive to a wavelength region shorter than that of visible light.

[0036] The second conductive layer 22b is preferably formed with a predetermined curvature so that the thickness gradually increases as it approaches the edge cover 23. That is, the upper surface of the second conductive layer 22b is preferably a curved surface whose thickness gradually increases as it approaches the edge cover 23. In this embodiment, the second conductive layer 22b provided in the red light emitting element 5R is formed with a predetermined curvature so that the thickness gradually increases as it approaches the edge cover 23, but this is not limited as long as it includes the central region, the peripheral region, and the end region. The central region of the second conductive layer 22b is a region provided farther from the edge cover 23 than the peripheral region of the second conductive layer 22b, and the end region of the second conductive layer 22b is a region provided closer to the edge cover 23 than the peripheral region of the second conductive layer 22b.

[0037] The green light-emitting element 5G shown in (b) of Figure 3 includes a first conductive layer 22a having a plane 22S that reflects visible light as an upper surface, and a second conductive layer 22b provided on the plane 22S and transmitting the visible light, the first electrode 22 including the second conductive layer 22b having a central region (first region) having a first thickness, a peripheral region (second region) located around the central region (first region) and having a second thickness thicker than the first thickness, and an end region (third region) located around the peripheral region (second region) and having a third thickness thicker than the second thickness; a functional layer 24G including at least a green light-emitting layer formed on the second conductive layer 22b along the shape of the second conductive layer 22b, and a second electrode 25 that transmits the visible light and is formed on the functional layer 24G; and an edge cover 23 that includes at least one of a visible light scattering material and a visible light blocking material, covers at least a portion of an end of the first electrode 22, and is formed higher than the second electrode 25. The second conductive layer 22b is preferably formed with a predetermined curvature so that the thickness gradually increases toward the edge cover 23. In the present embodiment, the second conductive layer 22b provided in the green light emitting element 5G is formed with a predetermined curvature so that the thickness gradually increases toward the edge cover 23, but is not limited to this as long as it includes the central region, the peripheral region, and the end region.

[0038] The blue light-emitting element 5B shown in (c) of Figure 3 includes a first conductive layer 22a having a plane 22S that reflects visible light as an upper surface, and a second conductive layer 22b provided on the plane 22S and transmitting the visible light, the first electrode 22 including a central region (first region) having a first thickness, a peripheral region (second region) located around the central region (first region) and having a second thickness thicker than the first thickness, and an end region (third region) located around the peripheral region (second region) and having a third thickness thicker than the second thickness, a functional layer 24B including at least a blue light-emitting layer formed on the second conductive layer 22b along the shape of the second conductive layer 22b, and a second electrode 25 that transmits the visible light and is formed on the functional layer 24B, and an edge cover 23 that includes at least one of a material scattering the visible light and a material blocking the visible light, covers at least a portion of an end of the first electrode 22, and is formed higher than the second electrode 25. The second conductive layer 22b is preferably formed with a predetermined curvature so that the thickness gradually increases toward the edge cover 23. In the present embodiment, the second conductive layer 22b provided in the blue light emitting element 5B is formed with a predetermined curvature so that the thickness gradually increases toward the edge cover 23, but is not limited to this as long as it includes the central region, the peripheral region, and the end region.

[0039] The first conductive layer 22a having the plane 22S reflecting visible light as its upper surface is not particularly limited as long as it can reflect visible light and has electrical conductivity, and may be made of, for example, a metal material such as Al, Mg, Li, Ag, or an alloy of the above metal materials. In this embodiment, the first conductive layer 22a is made of Al, but is not limited thereto.

[0040] The second conductive layer 22b provided on the plane 22S is not particularly limited as long as it can transmit visible light and has conductivity, and for example, a thin film made of a transparent metal oxide (for example, indium tin oxide, indium zinc oxide, indium gallium zinc oxide, etc.) or a metal material such as Al, Mg, Li, Ag, etc. can be used. In this embodiment, the second conductive layer 22b is formed using a transparent metal oxide (indium tin oxide), but is not limited thereto.

[0041] The second electrode 25 that transmits visible light is not particularly limited as long as it can transmit visible light and has electrical conductivity, and examples of the electrode include transparent metal oxides (e.g., indium tin oxide, indium zinc oxide, indium gallium zinc oxide, etc.), thin films made of metal materials such as Al, Mg, Li, Ag, etc., and nanowires made of metal materials such as Al, Ag, etc. In this embodiment, the second electrode 25 is formed using a transparent metal oxide (indium tin oxide), but is not limited thereto.

[0042] In this embodiment, as shown in (a) of FIG. 3, (b) of FIG. 3, and (c) of FIG. 3, each of the red light emitting element 5R, the green light emitting element 5G, and the blue light emitting element 5B provided in the display device 1 includes a first electrode 22 including a second conductive layer 22b including the central region, the peripheral region, and the end region, a functional layer including the corresponding light emitting layer formed on the second conductive layer 22b along the shape of the second conductive layer 22b, and a second electrode 25 that transmits the visible light and is formed on the functional layer, and an edge cover 23 that includes at least one of a material for scattering the visible light and a material for blocking the visible light, covers at least a part of the end of the first electrode 22, and is formed higher than the second electrode 25. The case will be described as an example, but is not limited to this, and at least one of the red light-emitting element 5R, the green light-emitting element 5G, and the blue light-emitting element 5B provided in the display device 1 may be provided with a first electrode 22 including a second conductive layer 22b including the central region, the peripheral region, and the end region, a functional layer including the corresponding light-emitting layer formed on the second conductive layer 22b along the shape of the second conductive layer 22b, and a second electrode 25 that transmits visible light and is formed on the functional layer, and an edge cover 23 that includes at least one of a visible light scattering material and a visible light blocking material, covers at least a portion of the end of the first electrode 22, and is formed higher than the second electrode 25.

[0043] 3(a), the film thickness from the plane 22S reflecting visible light to the second electrode 25 is the thickest in the portion including the end region of the second conductive layer 22b, the thinnest in the portion including the central region of the second conductive layer 22b, and the thickness in the portion including the peripheral region of the second conductive layer 22b is intermediate between the portion including the end region of the second conductive layer 22b and the portion including the central region of the second conductive layer 22b. Therefore, the optical path difference from the plane 22S reflecting visible light to the second electrode 25 can be reduced between the reflected light RL1 in the front direction passing through the peripheral region of the second conductive layer 22b and the reflected light RL1' in an oblique direction passing through the central region of the second conductive layer 22b. Furthermore, the difference in optical path length between the reflected light RL2 in the front direction passing over the central region of the second conductive layer 22b and the reflected light RL2' in an oblique direction passing over the peripheral region of the second conductive layer 22b is relatively small from the plane 22S that reflects visible light to the second electrode 25. On the other hand, the difference in optical path length between the reflected light RL3 in the front direction passing over the peripheral region of the second conductive layer 22b and the reflected light RL3' in an oblique direction passing over the edge of the end region of the second conductive layer 22b is large from the plane 22S that reflects visible light to the second electrode 25, but the reflected light RL3' is scattered, blocked, or scattered and blocked by the edge cover 23 that includes at least one of the visible light scattering material and the visible light blocking material, thereby realizing a red light emitting element 5R in which the viewing angle dependency of color change, including the color change when viewed from an oblique direction with a large viewing angle, is improved.

[0044] 3B, the film thickness from the plane 22S reflecting visible light to the second electrode 25 is the thickest in a portion including the end region of the second conductive layer 22b, the thinnest in a portion including the central region of the second conductive layer 22b, and the thickness in a portion including the peripheral region of the second conductive layer 22b is intermediate between the portion including the end region of the second conductive layer 22b and the portion including the central region of the second conductive layer 22b. Therefore, the optical path difference from the plane 22S reflecting visible light to the second electrode 25 can be reduced between the reflected light GL1 in the front direction passing through the peripheral region of the second conductive layer 22b and the reflected light GL1' in an oblique direction passing through the central region of the second conductive layer 22b. Furthermore, the difference in optical path length between the reflected light GL2 in the front direction passing over the central region of the second conductive layer 22b and the reflected light GL2' in the oblique direction passing over the peripheral region of the second conductive layer 22b is relatively small from the plane 22S that reflects visible light to the second electrode 25. On the other hand, the difference in optical path length between the reflected light GL3 in the front direction passing over the peripheral region of the second conductive layer 22b and the reflected light GL3' in the oblique direction passing over the edge of the end region of the second conductive layer 22b is large from the plane 22S that reflects visible light to the second electrode 25, but the reflected light GL3' is scattered, blocked, or scattered and blocked by the edge cover 23 that includes at least one of the visible light scattering material and the visible light blocking material, thereby realizing a green light-emitting element 5G in which the viewing angle dependency of color change, including the color change when viewed from an oblique direction with a large viewing angle, is improved.

[0045] 3(c), the film thickness from the plane 22S reflecting visible light to the second electrode 25 is the thickest in the portion including the end region of the second conductive layer 22b, the thinnest in the portion including the central region of the second conductive layer 22b, and the thickness in the portion including the peripheral region of the second conductive layer 22b is intermediate between the portion including the end region of the second conductive layer 22b and the portion including the central region of the second conductive layer 22b. Therefore, the optical path difference from the plane 22S reflecting visible light to the second electrode 25 can be reduced between the reflected light BL1 in the front direction passing through the peripheral region of the second conductive layer 22b and the reflected light BL1' in an oblique direction passing through the central region of the second conductive layer 22b. Furthermore, the difference in optical path between the reflected light BL2 in the front direction passing over the central region of the second conductive layer 22b and the reflected light BL2' in the oblique direction passing over the peripheral region of the second conductive layer 22b is relatively small from the plane 22S that reflects visible light to the second electrode 25. On the other hand, the difference in optical path between the reflected light BL3 in the front direction passing over the peripheral region of the second conductive layer 22b and the reflected light BL3' in the oblique direction passing over the edge of the end region of the second conductive layer 22b is large from the plane 22S that reflects visible light to the second electrode 25, but the reflected light BL3' is scattered, blocked, or scattered and blocked by the edge cover 23 including at least one of the visible light scattering material and the visible light blocking material, thereby realizing a blue light-emitting element 5B with improved viewing angle dependency of color change, including color change when viewed from an oblique direction with a large viewing angle.

[0046] The second conductive layer 22b including the central region, the peripheral region, and the end region can be formed by using the following method. First, the second conductive layer 22b is formed flat, and then a photosensitive resist layer is formed on the entire surface of the flatly formed second conductive layer 22b. Then, the photosensitive resist layer is exposed using a halftone mask and developed using a predetermined developer to form a photosensitive resist layer including the central region, which is the region with the thinnest film thickness, the end region, which is the region with the thickest film thickness, and the peripheral region, which is the region with the intermediate film thickness. Then, the photosensitive resist layer with different thicknesses and a part of the flatly formed second conductive layer 22b are removed using a dry etching method or a wet etching method to form the second conductive layer 22b including the central region, which is the region with the thinnest film thickness, the end region, which is the region with the thickest film thickness, and the peripheral region, which is the region with the intermediate film thickness. In this embodiment, the second conductive layer 22b is formed with a predetermined curvature so that the thickness gradually increases the closer it is to the edge cover 23, so the photosensitive resist layer is exposed and developed to form a film having a thickness gradually increasing the closer it is to the edge cover 23.

[0047] In this embodiment, an example will be described in which the red light-emitting layer of the red light-emitting element 5R, the green light-emitting layer of the green light-emitting element 5G, and the blue light-emitting layer of the blue light-emitting element 5B are each organic light-emitting layers formed by a vapor deposition method, but this is not limited to this, and each of the red light-emitting layer, the green light-emitting layer, and the blue light-emitting layer may be a light-emitting layer containing quantum dots as long as it can be formed to conform to the shape of the second conductive layer 22b.

[0048] In addition, in the red light emitting element 5R shown in Fig. 3(a), the second conductive layer 22b is formed with a first curvature, in the green light emitting element 5G shown in Fig. 3(b), the second conductive layer 22b is formed with a second curvature, and in the blue light emitting element 5B shown in Fig. 3(c), the second conductive layer 22b is formed with a third curvature, and the first curvature is preferably smaller than the second curvature and the third curvature. Furthermore, it is preferable that the second curvature is smaller than the third curvature.

[0049] According to the above configuration, since the first curvature is smaller than the second and third curvatures, it is possible to reduce color change in red light, which generally has a larger color change than green light and blue light. Also, since the second curvature is smaller than the third curvature, it is possible to reduce color change in green light, which generally has a larger color change than blue light.

[0050] Fig. 4(a) is a diagram showing a schematic configuration of the edge cover 23 provided for each of the red light emitting element 5R, the green light emitting element 5G, and the blue light emitting element 5B of the display device 1 of embodiment 1, and Fig. 4(b), Fig. 4(c), Fig. 4(d), and Fig. 4(e) are diagrams showing schematic configurations of other edge covers 23a, 23b, 23c, and 23d that can be provided for each of the red light emitting element 5R, the green light emitting element 5G, and the blue light emitting element 5B of the display device 1 of embodiment 1, respectively.

[0051] The edge cover 23 shown in Fig. 4(a) is made of a second edge cover 31 formed of a photosensitive resin material containing a scattering material that scatters visible light. As the scattering material that scatters visible light, commercially available particles that scatter visible light can be used as appropriate. The edge cover 23 can scatter the reflected light reflected by the plane 22S that reflects visible light, thereby realizing a light-emitting element with high luminous efficiency.

[0052] The edge cover 23a shown in FIG. 4B includes a first edge cover 30a formed of a photosensitive resin material containing carbon black that absorbs visible light as a light-shielding material that blocks visible light, and a second edge cover 31a formed of a photosensitive resin material containing a scattering material that scatters visible light. The first edge cover 30a is covered by the second edge cover 31a. In this embodiment, the light-shielding material that blocks visible light is described by taking as an example a case in which carbon black that absorbs visible light is used, but is not limited thereto, and for example, a metal material that reflects visible light or commercially available particles that reflect visible light can be used. The edge cover 23a can block and scatter the reflected light reflected by the plane 22S that reflects visible light, so that a light-emitting element with a good balance between light-emitting efficiency and the effect of reducing color change can be realized.

[0053] The edge cover 23b shown in Fig. 4(c) includes a second edge cover 31b and first edge covers 30b-30c that are provided on a part of the surface of the second edge cover 31b, for example, on an inclined surface of the second edge cover 31b, and are made of a photosensitive resin material containing carbon black that absorbs visible light as a light-shielding material that blocks visible light. The second edge cover 31b may be made of a material that transmits visible light, or may be made of a photosensitive resin material containing a scattering material that scatters visible light. The edge cover 23b can block light reflected by the plane 22S that reflects visible light, thereby realizing a light-emitting element that is highly effective in reducing color change.

[0054] 4(d) includes a second edge cover 31b and a first edge cover 30d that is provided on the entire surface of the second edge cover 31b and is made of a photosensitive resin material containing carbon black that absorbs visible light as a light-shielding material that blocks visible light. The edge cover 23c can block light reflected by the plane 22S that reflects visible light, thereby realizing a light-emitting element that is highly effective in reducing color change.

[0055] 4(e) is made of a first edge cover 30e made of a photosensitive resin material containing carbon black, which absorbs visible light, as a light-shielding material that blocks visible light. The edge cover 23d can block light reflected by the plane 22S that reflects visible light, thereby realizing a light-emitting element that is highly effective in reducing color change.

[0056] [Embodiment 2] Next, a second embodiment of the present invention will be described with reference to FIG. 5. The display device 1a of this embodiment is different from the first embodiment in that the second edge covers 31c, 31d, and 31e, which include a scattering material that scatters visible light, are provided on the first edge covers 30f, 30g, and 30h, which include a light-shielding material that blocks visible light, and a fourth portion P4, which is lower in height than the third portion P3 of the first edge cover 30h, which includes a light-shielding material that blocks visible light, and a sixth portion P6, which is lower in height than the fifth portion P5 of the first edge cover 30f, which includes a light-shielding material that blocks visible light, are disposed near the blue light-emitting layer, which generally has a low light-emitting efficiency, of the blue light-emitting element 5B. The rest is as described in the first embodiment. For convenience of description, the same reference numerals are used for members having the same functions as those shown in the drawings of the first embodiment, and their description will be omitted.

[0057] FIG. 5 is a cross-sectional view showing a schematic configuration of a display device 1a of the second embodiment.

[0058] As shown in FIG. 5, the red light-emitting element 5R and the green light-emitting element 5G share a portion of the edge cover 23f, the green light-emitting element 5G and the blue light-emitting element 5B share a portion of the edge cover 23g, and the blue light-emitting element 5B and the red light-emitting element 5R share a portion of the edge cover 23e.

[0059] In the display device 1a, second edge covers 31c, 31d, and 31e including a scattering material that scatters visible light are provided on first edge covers 30f, 30g, and 30h including a light blocking material that blocks visible light. In the display device 1a of the present embodiment, the edge covers 23e, 23f, and 23g have the same height, but the display device 1a is not limited to this and the edge covers 23e, 23f, and 23g may have different heights.

[0060] As shown in FIG. 5, in the display device 1a, the edge cover (first shared edge cover) 23f includes a first portion P1 of the first edge cover 30g in which the height of the first edge cover 30g is greater and a second portion P2 of the first edge cover 30g in which the height of the first edge cover 30g is less, the edge cover (second shared edge cover) 23g includes a third portion P3 of the first edge cover 30h in which the height of the first edge cover 30h is greater and a fourth portion P4 of the first edge cover 30h in which the height of the first edge cover 30h is less, and the edge cover (third shared edge cover) 23e includes a fifth portion P5 of the first edge cover 30f in which the height of the first edge cover 30f is greater and a sixth portion P6 of the first edge cover 30f in which the height of the first edge cover 30f is less.

[0061] Furthermore, as shown in FIG. 5, in the display device 1a, the height of the first portion P1 of the first edge cover 30g including a light-shielding material that blocks visible light is made the same as the height of the fifth portion P5 of the first edge cover 30f including a light-shielding material that blocks visible light, the height of the second portion P2 of the first edge cover 30g including a light-shielding material that blocks visible light is made the same as the height of the third portion P3 of the first edge cover 30h including a light-shielding material that blocks visible light, and the height of the fourth portion P4 of the first edge cover 30h including a light-shielding material that blocks visible light is made the same as the height of the sixth portion P6 of the first edge cover 30f including a light-shielding material that blocks visible light are described as an example, but is not limited to this.

[0062] In the display device 1a of this embodiment, (height of the first portion P1 of the first edge cover 30g = height of the fifth portion P5 of the first edge cover 30f) > (height of the second portion P2 of the first edge cover 30g = height of the third portion P3 of the first edge cover 30h) > (height of the fourth portion P4 of the first edge cover 30h = height of the sixth portion P6 of the first edge cover 30f), and the first portion P1 and the fifth portion P5 are provided near the red light-emitting layer of the red light-emitting element 5R, the second portion P2 and the third portion P3 are provided near the green light-emitting layer of the green light-emitting element 5G, and the fourth portion P4 and the sixth portion P6 are provided near the blue light-emitting layer of the blue light-emitting element 5B.

[0063] According to the display device 1a, a first edge cover with a high height is formed near the red light emitting layer of the red light emitting element 5R, which generally has a large color change, a first edge cover with a low height is formed near the blue light emitting layer of the blue light emitting element 5B, which generally has a low luminous efficiency, and a first edge cover with an intermediate height is formed near the green light emitting layer of the green light emitting element 5G, which generally has a smaller color change than the red light emitting layer of the red light emitting element 5R. Therefore, a display device 1a with a good balance between luminous efficiency and the effect of reducing color change can be realized.

[0064] The first edge covers 30f, 30g, and 30h can be formed by exposing a photosensitive resin material containing a light-shielding material that blocks visible light to light using a halftone mask, and developing the same.

[0065] [Embodiment 3] Next, a third embodiment of the present invention will be described with reference to FIG. 6. The display device 1b of this embodiment is different from the first and second embodiments in that the second edge covers 31f, 31g, and 31h containing a scattering material that scatters visible light are provided on the first edge cover 30i containing a light-shielding material that blocks visible light, and the second edge cover 31h containing a scattering material that scatters visible light and the tenth portion P10 having a height lower than the ninth portion P9 of the second edge cover 31f containing a scattering material that scatters visible light are disposed near the blue light-emitting layer of the blue light-emitting element 5B, which generally has a low light-emitting efficiency. The rest is as described in the first and second embodiments. For convenience of description, the same reference numerals are used for members having the same functions as those shown in the drawings of the first and second embodiments, and their description will be omitted.

[0066] FIG. 6 is a cross-sectional view showing a schematic configuration of a display device 1b according to the third embodiment.

[0067] As shown in FIG. 6, the red light-emitting element 5R and the green light-emitting element 5G share a portion of the edge cover 23i, the green light-emitting element 5G and the blue light-emitting element 5B share a portion of the edge cover 23j, and the blue light-emitting element 5B and the red light-emitting element 5R share a portion of the edge cover 23h.

[0068] In the display device 1b, the second edge covers 31f, 31g, and 31h including a scattering material that scatters visible light are provided on the first edge cover 30i including a light-shielding material that blocks visible light. In the display device 1b of the present embodiment, the first edge covers 30i including a light-shielding material that blocks visible light have the same height, but the present invention is not limited to this.

[0069] As shown in FIG. 6, in the display device 1b, in each of the edge cover (first shared edge cover) 23i, the edge cover (second shared edge cover) 23j, and the edge cover (third shared edge cover) 23h, the height of the first edge cover 30i is the same, and the edge cover (first shared edge cover) 23i includes a seventh portion P7 of the second edge cover 31g having a higher height and an eighth portion P8 of the second edge cover 31g having a lower height, the edge cover (second shared edge cover) 23j includes the second edge cover 31h having the same height and including a scattering material that scatters visible light, and the edge cover (third shared edge cover) 23h includes a ninth portion P9 of the second edge cover 31f having a higher height and an tenth portion P10 of the second edge cover 31f having a lower height.

[0070] Furthermore, as shown in FIG. 6, in the display device 1b, the height of the seventh portion P7 of the second edge cover 31g containing a scattering material that scatters visible light is made the same as the height of the ninth portion P9 of the second edge cover 31f containing a scattering material that scatters visible light, and the height of the eighth portion P8 of the second edge cover 31g containing a scattering material that scatters visible light is made the same as the height of the tenth portion P10 of the second edge cover 31f containing a scattering material that scatters visible light, and the height of the second edge cover 31h containing a scattering material that scatters visible light in the edge cover (second shared edge cover) 23j, are described as an example, but this is not limited to this.

[0071] In the display device 1b of this embodiment, (height of the seventh portion P7 of the second edge cover 31g = height of the ninth portion P9 of the second edge cover 31f) > (height of the eighth portion P8 of the second edge cover 31g = height of the tenth portion P10 of the second edge cover 31f) = (height of the second edge cover 31h), and the seventh portion P7 and the ninth portion P9 are provided near the red light-emitting layer of the red light-emitting element 5R, the eighth portion P8 and the second edge cover 31h are provided near the green light-emitting layer of the green light-emitting element 5G, and the tenth portion P10 and the second edge cover 31h are provided near the blue light-emitting layer of the blue light-emitting element 5B.

[0072] According to the display device 1b, a second edge cover with a high height is formed near the red light-emitting layer of the red light-emitting element 5R, which generally has a large color change, a second edge cover with a low height is formed near the blue light-emitting layer of the blue light-emitting element 5B, which generally has a low luminous efficiency, and a second edge cover with a low height is also formed near the green light-emitting layer of the green light-emitting element 5G, which has a smaller color change than the red light-emitting layer of the red light-emitting element 5R. Therefore, a display device 1b with a good balance between luminous efficiency and the effect of reducing color change can be realized.

[0073] The second edge covers 31f, 31g, and 31h can be formed by exposing a photosensitive resin material containing a scattering material that scatters visible light using a halftone mask and developing it.

[0074] 〔summary〕 [Aspect 1] a first electrode including a first conductive layer having a plane as an upper surface that reflects visible light, and a second conductive layer provided on the plane and transmitting the visible light, the second conductive layer including a first region having a first thickness, a second region located around the first region and having a second thickness that is thicker than the first thickness, and a third region located around the second region and having a third thickness that is thicker than the second thickness; a functional layer including at least a light-emitting layer formed on the second conductive layer along a shape of the second conductive layer, and a second electrode that transmits the visible light and is formed on the functional layer; an edge cover including at least one of the visible light scattering material and the visible light blocking material, covering at least a portion of an end of the first electrode and being formed higher than the second electrode.

[0075] [Aspect 2] 2. The light-emitting element of aspect 1, wherein the second conductive layer is formed with a predetermined curvature.

[0076] [Aspect 3] 3. The light-emitting device of claim 1 or 2, wherein the edge cover includes a first edge cover including the light-blocking material and a second edge cover including the scattering material.

[0077] Aspect 4 4. The light-emitting element of claim 3, wherein the second edge cover is provided on the first edge cover.

[0078] Aspect 5 4. The light-emitting element of embodiment 3, wherein the first edge cover is covered by the second edge cover.

[0079] Aspect 6 The edge cover is A second edge cover; a first edge cover including the light-shielding material provided on at least a portion of a surface of the second edge cover.

[0080] Aspect 7 3. The light-emitting device of claim 1 or 2, wherein the edge cover comprises the scattering material.

[0081] Aspect 8 3. The light-emitting device of claim 1 or 2, wherein the edge cover comprises the light-shielding material.

[0082] Aspect 9 the first electrode is an anode; 9. The light-emitting device of any one of aspects 1 to 8, wherein the second electrode is a cathode.

[0083] Aspect 10 the first electrode is a cathode; 9. The light-emitting device of any one of aspects 1 to 8, wherein the second electrode is an anode.

[0084] Aspect 11 11. The light-emitting device according to any one of aspects 1 to 10, wherein the light-emitting layer is an organic light-emitting layer or a light-emitting layer containing quantum dots.

[0085] Aspect 12 A plurality of the light-emitting devices according to any one of aspects 1 to 11 are provided; The plurality of light emitting elements include a first light emitting element, a second light emitting element, and a third light emitting element, the first light emitting element emits light having a longer central wavelength than the second light emitting element and the third light emitting element; The second light emitting element emits light having a central emission wavelength longer than that of the third light emitting element.

[0086] Aspect 13 the second conductive layer of the first light emitting element is formed with a first curvature, the second conductive layer of the second light emitting element is formed with a second curvature, the second conductive layer of the third light emitting element is formed with a third curvature, 13. The display device of claim 12, wherein the first curvature is smaller than the second curvature and the third curvature.

[0087] Aspect 14 14. The display device of claim 13, wherein the second curvature is smaller than the third curvature.

[0088] Aspect 15 the first light emitting element and the second light emitting element share a part of the edge cover; the second light emitting element and the third light emitting element share a part of the edge cover; 15. The display device of any one of aspects 12 to 14, wherein the first light-emitting element and the third light-emitting element share a portion of the edge cover.

[0089] Aspect 16 A plurality of the light-emitting devices according to aspect 4 are provided, The plurality of light emitting elements include a first light emitting element, a second light emitting element, and a third light emitting element, the first light emitting element emits light having a longer central wavelength than the second light emitting element and the third light emitting element; the second light emitting element emits light having a longer central wavelength than the third light emitting element, the edge cover shared by the first light emitting element and the second light emitting element is a first shared edge cover; the edge cover shared by the second light emitting element and the third light emitting element is a second shared edge cover; the edge cover shared by the first light emitting element and the third light emitting element is a third shared edge cover; the first shared edge cover includes a first portion of the first edge cover having a higher height and a second portion of the first edge cover having a lower height; the second shared edge cover includes a third portion of the first edge cover having a higher height than the first edge cover and a fourth portion of the first edge cover having a lower height than the first edge cover; the third shared edge cover includes a fifth portion of the first edge cover having a higher height than the first edge cover and a sixth portion of the first edge cover having a lower height than the first edge cover; the first portion and the fifth portion are provided near a first light-emitting layer which is the light-emitting layer included in the first light-emitting element, the second portion and the third portion are provided near a second light-emitting layer which is the light-emitting layer included in the second light-emitting element, A display device, wherein the fourth portion and the sixth portion are provided near a third light-emitting layer which is the light-emitting layer included in the third light-emitting element.

[0090] Aspect 17 The height of the first portion and the height of the fifth portion are the same, The height of the second portion and the height of the third portion are the same, 17. The display device of claim 16, wherein the height of the fourth portion and the height of the sixth portion are the same.

[0091] Aspect 18 18. The display device of claim 16 or 17, wherein a height of the first shared edge cover, a height of the second shared edge cover, and a height of the third shared edge cover are the same.

[0092] Aspect 19 A plurality of the light-emitting devices according to aspect 4 are provided, The plurality of light emitting elements include a first light emitting element, a second light emitting element, and a third light emitting element, the first light emitting element emits light having a longer central wavelength than the second light emitting element and the third light emitting element; the second light emitting element emits light having a longer central wavelength than the third light emitting element, the edge cover shared by the first light emitting element and the second light emitting element is a first shared edge cover; the edge cover shared by the second light emitting element and the third light emitting element is a second shared edge cover; the edge cover shared by the first light emitting element and the third light emitting element is a third shared edge cover; In each of the first shared edge cover, the second shared edge cover, and the third shared edge cover, the height of the first edge cover is the same; the first shared edge cover includes a seventh portion of the second edge cover having a higher height than the second edge cover and an eighth portion of the second edge cover having a lower height than the second edge cover; The second shared edge cover has the same height as the second edge cover; the third shared edge cover includes a ninth portion of the second edge cover having a higher height than the second edge cover and a tenth portion of the second edge cover having a lower height than the second edge cover; the seventh portion and the ninth portion are provided near a first light-emitting layer that is the light-emitting layer included in the first light-emitting element, The eighth portion and the second edge cover in the second shared edge cover are provided near a second light-emitting layer that is the light-emitting layer included in the second light-emitting element, A display device, wherein the tenth portion and the second edge cover in the second shared edge cover are provided near a third light-emitting layer, which is the light-emitting layer provided in the third light-emitting element.

[0093] Aspect 20 The seventh portion and the ninth portion have the same height, 20. The display device of claim 19, wherein the height of the eighth portion, the height of the tenth portion, and the height of the second edge cover in the second shared edge cover are the same.

[0094] Aspect 21 the first light emitting element is a light emitting element that emits red light, the second light emitting element is a light emitting element that emits green light, 21. The display device of any one of aspects 12 to 20, wherein the third light-emitting element is a light-emitting element that emits blue light.

[0095] [Additional Notes] The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the claims. The technical scope of the present invention also includes embodiments obtained by appropriately combining the technical means disclosed in the different embodiments. Furthermore, new technical features can be formed by combining the technical means disclosed in the respective embodiments. [Industrial Applicability]

[0096] The present disclosure can be used in light-emitting devices and display devices. [Explanation of symbols]

[0097] 1, 1a, 1b display device 3. Barrier layer 4 Thin Film Transistor Layer 5R Red light emitting element (light emitting element) 5G green light emitting element (light emitting element) 5B Blue light-emitting element (light-emitting element) 12 Substrate 16, 18, 20 Inorganic insulating film 21 Planarization film 22 1st electrode 22a First conductive layer 22b Second conductive layer 22S plane 23 Edge cover 24R Functional layer including red light-emitting layer 24G Functional layer including green light-emitting layer 24B Functional layer including blue light-emitting layer 25 2nd electrode 30a~30i 1st edge cover 31, 31a~31h 2nd edge cover P1 to P6: First to sixth parts of the first edge cover P7~P10 Seventh to tenth parts of the second edge cover PIX RSP Red sub-pixel GSP Green sub-pixel BSP Blue subpixel TR Transistor SEM, SEM', SEM'' Semiconductor Film G gate electrode D drain electrode S source electrode DA display area NDA Frame Area

Claims

1. a first electrode including a first conductive layer having a plane as an upper surface that reflects visible light; and a second conductive layer provided on the plane and transmitting the visible light, the second conductive layer including a first region having a first thickness, a second region located around the first region and having a second thickness that is thicker than the first thickness, and a third region located around the second region and having a third thickness that is thicker than the second thickness; a functional layer including at least a light-emitting layer formed on the second conductive layer along a shape of the second conductive layer, and a second electrode that transmits the visible light and is formed on the functional layer; an edge cover including at least one of the visible light scattering material and the visible light blocking material, covering at least a portion of an end of the first electrode and being formed higher than the second electrode.

2. The light-emitting element according to claim 1 , wherein the second conductive layer is formed with a predetermined curvature.

3. The light-emitting element according to claim 1 , wherein the edge cover includes a first edge cover including the light-blocking material and a second edge cover including the scattering material.

4. The light-emitting element according to claim 3 , wherein the second edge cover is provided on the first edge cover.

5. The light-emitting element according to claim 3 , wherein the first edge cover is covered by the second edge cover.

6. The edge cover is A second edge cover; The light-emitting element according to claim 1 , further comprising: a first edge cover including the light-shielding material provided on at least a portion of a surface of the second edge cover.

7. The light-emitting device according to claim 1 , wherein the edge cover comprises the scattering material.

8. The light-emitting device according to claim 1 , wherein the edge cover includes the light-shielding material.

9. the first electrode is an anode; The light-emitting element according to claim 1 , wherein the second electrode is a cathode.

10. the first electrode is a cathode; The light-emitting element according to claim 1 , wherein the second electrode is an anode.

11. The light-emitting device according to claim 1 , wherein the light-emitting layer is an organic light-emitting layer or a light-emitting layer containing quantum dots.

12. A light-emitting device comprising a plurality of light-emitting elements according to any one of claims 1 to 11, The plurality of light emitting elements include a first light emitting element, a second light emitting element, and a third light emitting element, the first light emitting element emits light having a longer central wavelength than the second light emitting element and the third light emitting element; The second light emitting element emits light having a central emission wavelength longer than that of the third light emitting element.

13. The second conductive layer of the first light emitting element is formed with a first curvature, The second conductive layer of the second light emitting element is formed with a second curvature, the second conductive layer of the third light emitting element is formed with a third curvature, The display device of claim 12 , wherein the first curvature is smaller than the second curvature and the third curvature.

14. The display device of claim 13 , wherein the second curvature is smaller than the third curvature.

15. the first light emitting element and the second light emitting element share a part of the edge cover; the second light emitting element and the third light emitting element share a part of the edge cover; The display device according to claim 12 , wherein the first light emitting element and the third light emitting element share a part of the edge cover.

16. A light emitting device comprising a plurality of light emitting devices according to claim 4, The plurality of light emitting elements include a first light emitting element, a second light emitting element, and a third light emitting element, the first light emitting element emits light having a longer central wavelength than the second light emitting element and the third light emitting element; the second light emitting element emits light having a longer central wavelength than the third light emitting element, the edge cover shared by the first light emitting element and the second light emitting element is a first shared edge cover, the edge cover shared by the second light emitting element and the third light emitting element is a second shared edge cover; the edge cover shared by the first light emitting element and the third light emitting element is a third shared edge cover, the first shared edge cover includes a first portion of the first edge cover having a higher height of the first edge cover and a second portion of the first edge cover having a lower height of the first edge cover; the second shared edge cover includes a third portion of the first edge cover having a higher height than the first edge cover and a fourth portion of the first edge cover having a lower height than the first edge cover; the third shared edge cover includes a fifth portion of the first edge cover having a higher height than the first edge cover and a sixth portion of the first edge cover having a lower height than the first edge cover; the first portion and the fifth portion are provided near a first light-emitting layer which is the light-emitting layer included in the first light-emitting element, the second portion and the third portion are provided near a second light-emitting layer which is the light-emitting layer included in the second light-emitting element, The display device, wherein the fourth portion and the sixth portion are provided near a third light-emitting layer which is the light-emitting layer included in the third light-emitting element.

17. The height of the first portion and the height of the fifth portion are the same, The height of the second portion and the height of the third portion are the same, The display device according to claim 16 , wherein the fourth portion and the sixth portion have the same height.

18. The display device according to claim 16 or 17, wherein a height of the first shared edge cover, a height of the second shared edge cover, and a height of the third shared edge cover are the same.

19. A light emitting device comprising a plurality of light emitting devices according to claim 4, The plurality of light emitting elements include a first light emitting element, a second light emitting element, and a third light emitting element, the first light emitting element emits light having a longer central wavelength than the second light emitting element and the third light emitting element; the second light emitting element emits light having a longer central wavelength than the third light emitting element, the edge cover shared by the first light emitting element and the second light emitting element is a first shared edge cover, the edge cover shared by the second light emitting element and the third light emitting element is a second shared edge cover; the edge cover shared by the first light emitting element and the third light emitting element is a third shared edge cover, In each of the first shared edge cover, the second shared edge cover, and the third shared edge cover, the height of the first edge cover is the same; the first shared edge cover includes a seventh portion of the second edge cover having a higher height than the second edge cover, and an eighth portion of the second edge cover having a lower height than the second edge cover; The second shared edge cover has the same height as the second edge cover; the third shared edge cover includes a ninth portion of the second edge cover having a higher height than the second edge cover and a tenth portion of the second edge cover having a lower height than the second edge cover; the seventh portion and the ninth portion are provided near a first light-emitting layer which is the light-emitting layer included in the first light-emitting element, The eighth portion and the second edge cover in the second shared edge cover are provided near a second light-emitting layer that is the light-emitting layer included in the second light-emitting element, A display device, wherein the tenth portion and the second edge cover in the second shared edge cover are provided near a third light-emitting layer, which is the light-emitting layer provided in the third light-emitting element.

20. The seventh portion and the ninth portion have the same height, The display device of claim 19 , wherein a height of the eighth portion, a height of the tenth portion, and a height of the second edge cover in the second shared edge cover are the same.

21. the first light-emitting element is a light-emitting element that emits red light, the second light emitting element is a light emitting element that emits green light, The display device according to claim 12 , wherein the third light-emitting element is a light-emitting element that emits blue light.

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