Light-emitting device and image display device

Abstract

A light-emitting device according to an embodiment of the present disclosure comprises a light-emitting element and a first optical element. The light-emitting element has a light-emitting surface that extends along a first surface. The first optical element has a light incident surface facing the light-emitting surface, and a light emission surface including a first inclined surface forming an angle of less than 90° with respect to the light-emitting surface, and overlaps the light-emitting element in a first direction orthogonal to the first surface. In the first surface, the area of a first optical element-occupied region occupied by the first optical element is equal to or less than the area of a light-emitting surface-occupied region occupied by the light-emitting surface. The entire first optical element-occupied region overlaps the light-emitting surface in the first direction.

Description

Light-emitting device and image display device

[0001] This disclosure relates to a light-emitting device and an image display device equipped with the light-emitting device.

[0002] To date, for example, light-emitting devices have been proposed that include a sealing member that covers the upper surface and outer periphery of a light-emitting element provided on a substrate, and optically controls the light emitted from the light-emitting element (see, for example, Patent Document 1).

[0003] Japanese Patent Publication No. 2021-068913

[0004] Incidentally, while light-emitting devices using micro-LEDs (Light Emitting Diodes) allow for high-density mounting compared to conventional LED-based light-emitting devices, they present the challenge of difficulty in controlling light distribution.

[0005] An embodiment of the present disclosure comprises a light-emitting device and a first optical element. The light-emitting device has a light-emitting surface that extends along a first surface. The first optical element has a light-incident surface facing the light-emitting surface and a light-emitting surface including a first inclined surface that forms an angle of less than 90° with respect to the light-emitting surface, and overlaps with the light-emitting device in a first direction perpendicular to the first surface. The area of ​​the region occupied by the first optical element on the first surface is equal to or less than the area of ​​the region occupied by the light-emitting surface. The entire region occupied by the first optical element overlaps with the light-emitting surface in a first direction.

[0006] In one embodiment of the present disclosure, the area occupied by the first optical element on the first surface is equal to or less than the area occupied by the light-emitting surface. Therefore, when multiple light-emitting elements are provided, the distance between light-emitting elements can be narrowed. Furthermore, in one embodiment of the present disclosure, at least a portion of the light emitted from the light-emitting surface of the light-emitting element is reflected by the first inclined surface of the light-emitting surface of the first optical element, which is at an angle of less than 90° with respect to the light-emitting surface, and then refracted at an arbitrary angle and emitted from the light-emitting surface of the first optical element.

[0007] Figure 1 is a schematic cross-sectional view showing an example of the configuration of a light-emitting device according to an embodiment of the present disclosure. Figure 2 is a schematic plan view showing an example of the configuration of the light-emitting device shown in Figure 1. Figure 3A is a schematic cross-sectional view illustrating an example of the manufacturing process of the light-emitting device shown in Figure 1. Figure 3B is a schematic cross-sectional view showing the process following Figure 3A. Figure 3C is a schematic cross-sectional view showing the process following Figure 3B. Figure 3D is a schematic cross-sectional view showing the process following Figure 3C. Figure 3E is a schematic cross-sectional view showing the process following Figure 3D. Figure 3F is a schematic cross-sectional view showing the process following Figure 3E. Figure 3G is a schematic cross-sectional view showing the process following Figure 3F. Figure 3H is a schematic cross-sectional view showing the process following Figure 3G. Figure 4A is a schematic cross-sectional view showing an example of the configuration of a light-emitting device as a reference example. Figure 4B is a schematic cross-sectional view showing another example of the configuration of a light-emitting device as a reference example. Figure 5A is a schematic cross-sectional view showing an example of the configuration of a light-emitting device according to Modification 1 of the present disclosure. Figure 5B is a schematic cross-sectional view showing another example of the configuration of a light-emitting device according to Modification 1 of the present disclosure. Figure 6 is a schematic cross-sectional view showing an example of the configuration of a light-emitting device according to Modification 2 of the present disclosure. Figure 7 is a schematic cross-sectional view showing an example of the configuration of a light-emitting device according to Modification 3 of the present disclosure. Figure 8 is a schematic cross-sectional view showing an example of the configuration of a light-emitting device according to Modification 4 of the present disclosure. Figure 9A is a schematic cross-sectional view showing an enlarged example of a part of the optical element according to Modification 5 of the present disclosure. Figure 9B is a schematic cross-sectional view showing another enlarged example of a part of the optical element according to Modification 5 of the present disclosure. Figure 10 is a schematic cross-sectional view showing an example of the configuration of a light-emitting device according to Modification 6 of the present disclosure. Figure 11A is a schematic cross-sectional view showing an example of the configuration of a light-emitting device according to Modification 7 of the present disclosure. Figure 11B is a schematic plan view showing an example of the configuration of the light-emitting device shown in Figure 11A. Figure 12A is a schematic plan view showing an example of the configuration of the cluster of the light-emitting device shown in Figure 11A. Figure 12B is a schematic plan view showing another example of the configuration of the cluster of the light-emitting device shown in Figure 11A. Figure 13 is a perspective view showing an example of the configuration of an image display device according to an application example of this disclosure. Figure 14 is a schematic diagram showing an example of the wiring layout of the image display device shown in Figure 13. Figure 15 is a perspective view showing an example of the configuration of an image display device according to an application example of this disclosure. Figure 16 is a perspective view showing the configuration of the mounting substrate shown in Figure 15. Figure 17 is a perspective view showing the configuration of the unit substrate shown in Figure 16.Figure 18 is a diagram showing an example of an image display device according to an application example of the present disclosure. Figure 19A is a schematic diagram showing an example of a cross-section of the first optical element in the XZ plane. Figure 19B is a schematic diagram showing another example of a cross-section of the first optical element in the XZ plane. Figure 19C is an enlarged schematic diagram showing an example of the configuration of the first optical element shown in Figure 1.

[0008] Hereinafter, one embodiment of the present disclosure will be described in detail with reference to the drawings. The following description is a specific example of the present disclosure, and the present disclosure is not limited to the following embodiment. Furthermore, the present disclosure is not limited to the arrangement, dimensions, dimensional ratios, etc., of each component shown in each figure. The order of description is as follows: 1. Embodiment (Example of a light-emitting device in which the light-emitting surface of the light-emitting element and the bottom surface of the optical element coincide) 1-1. Configuration of the light-emitting device 1-2. Method of manufacturing the light-emitting device 1-3. Operation and effects 2. Modifications 2-1. Modification 1 (Another example of a light-emitting device) 2-2. Modification 2 (Another example of a light-emitting device) 2-3. Modification 3 (Another example of a light-emitting device) 2-4. Modification 4 (Another example of a light-emitting device) 2-5. Modification 5 (Another example of a light-emitting device) 2-6. Modification 6 (Another example of a light-emitting device) 2-7. Modification 7 (Another example of a light-emitting device) 2-8. Modification 8 (Another example of a light-emitting device) 3. Application examples

[0009] <1. Embodiments> Figure 1 schematically shows an example of the cross-sectional configuration of the light-emitting device 1 according to an embodiment of the present disclosure. Figure 2 schematically shows an example of the planar configuration of the light-emitting device 1 shown in Figure 1. The light-emitting device 1 is suitably applicable to the display panel of an image display device called a so-called LED display (for example, the image display device 100 shown in Figure 13 later).

[0010] [1-1. Configuration of the Light-Emitting Device] The light-emitting device 1 is constructed by sequentially stacking, for example, a substrate 21 and a light-emitting unit 10 in the Z-axis direction, which is the thickness direction perpendicular to the XY plane. The light-emitting unit 10 has a structure in which one or more light-emitting elements 11 and one or more first optical elements 12 are sequentially stacked in the Z-axis direction from the substrate 21 side. As shown in Figure 2, for example, the light-emitting device 1 has a plurality of light-emitting units 10 arranged in a two-dimensional array. The distance L1 between adjacent light-emitting units 10 is, for example, 20 mm or less. The XY plane corresponds to one specific example of the "first plane" as one aspect of the present disclosure. The Z-axis direction corresponds to one specific example of the "first direction" as one aspect of the present disclosure.

[0011] The light-emitting element 11 is provided, for example, in each of the multiple pixels that make up an image display device. That is, for example, one light-emitting element 11 is provided for each pixel. However, multiple light-emitting elements 11 may be provided for each pixel. For example, several thousand to tens of thousands of light-emitting elements 11 are provided in an image display device. The light-emitting element 11 is a solid-state light-emitting element that emits light in a predetermined wavelength band from its upper surface, which is the light-emitting surface 11S1. The light-emitting element 11 is, for example, an LED (Light Emitting Diode) chip. An LED chip refers to an LED that has been cut from a wafer used for crystal growth, and is not a package type covered with molded resin or the like. The LED chip is, for example, 100 μm or less in size and is what is called a microLED.

[0012] The light-emitting element 11 is provided on the substrate 21 and is electrically connected to the substrate 21. The light-emitting surface 11S1 of the light-emitting element 11 is the surface opposite to the surface facing the substrate 21. The light-emitting element 11 is formed of, for example, a GaN-based semiconductor material. Light L in the blue band, for example, between 430 nm and 500 nm, is emitted from the light-emitting surface 11S1 of the light-emitting element 11. Light with wavelengths corresponding to the ultraviolet region (ultraviolet light) may also be extracted from the light-emitting element 11.

[0013] The first optical element 12 has a light incident surface 12S1 and a light emission surface 12S2. The light incident surface 12S1 faces the light-emitting surface 11S1 of the light-emitting element 11. The light emission surface 12S2 includes one or more recesses, for example, that have a concave shape with respect to the light incident surface 12S1. For example, as shown in Figure 1, the light emission surface 12S2 has a concave curved surface with respect to the light incident surface 12S1. That is, in the example of Figure 1, the light emission surface 12S2 has a dome shape and is curved so that it becomes closer to parallel to the light-emitting surface 11S1 as it moves away from it. The light emission surface 12S2 includes a first inclined surface K1 and a second inclined surface K2 that form angles of less than 90° with respect to the light-emitting surface 11S1. The second inclined surface K2 is inclined with respect to the first inclined surface K1. That is, the first inclined surface K1 and the second inclined surface K2 are non-parallel. In the example shown in Figure 1, the light-emitting surface 12S2 is perpendicular to the light-emitting surface 11S1 where it is in contact with the light-emitting surface 11S1, but at other points, it is at an angle of 0° or more and less than 90° with respect to the light-emitting surface 11S1. In the XY plane, the area of ​​the region occupied by the first optical element 12 is equal to or less than the area of ​​the region occupied by the light-emitting surface 11S1. Furthermore, the entire region occupied by the first optical element overlaps with the light-emitting surface 11S1 in the Z-axis direction. Note that Figure 1 illustrates the case where the area of ​​the region occupied by the first optical element 12 is equal to the area of ​​the region occupied by the light-emitting surface 11S1. In other words, in the light-emitting unit 10 shown in Figure 1, the shape of the light incident surface 12S1 of the first optical element 12 is substantially the same as the shape of the light-emitting surface 11S1 of the light-emitting element 11, and the size of the light incident surface 12S1 of the first optical element 12 is substantially the same as the size of the light-emitting surface 11S1 of the light-emitting element 11. However, in the light-emitting device 1, the area occupied by the first optical element 12 may be smaller than the area occupied by the light-emitting surface 11S1. In other words, in the light-emitting unit 10, it is sufficient that the first optical element 12 does not extend beyond the light-emitting element 11 in the XY plane. The light incident surface 12S1 of the first optical element 12 is substantially parallel to the light-emitting surface 11S1 of the light-emitting element 11.

[0014] The first optical element 12 is an optical component that reflects at least a portion of the light emitted from the light-emitting surface 11S1 of the light-emitting element 11. The first optical element 12 is formed using, for example, a resin material.

[0015] (Cross-sectional requirements of the first optical element 12) At least a portion of the cross-section 12S3 of the first optical element 12 in the XZ plane satisfies the following requirements. Figure 19A schematically represents an example of the cross-section 12S3 of the first optical element 12 in the XZ plane. Figure 19B schematically represents another example of the cross-section 12S3 of the first optical element 12 in the XZ plane. Figure 19C schematically represents an enlarged configuration of the first optical element 12 shown in Figure 1.

[0016] When the cross-section 12S3 of the first optical element 12 is approximated by an isosceles triangle as shown in Figure 19A, the lengths of the first inclined surface K1 and the second inclined surface K2 are equal. In the cross-section 12S3, the first inclined surface K1 is inclined at an angle of inclination θ with respect to the light incident surface 12S1. For example, if the refractive index n of the first optical element 12 is 1.8, when the inclination angle θ is 80° (= 4π / 9) or greater, the emission angle η cannot be 60° or greater for light whose emission angle φ from the light-emitting surface 11S1 is 60° or less (│φ│ ≦ 60°). As a result, the aspect ratio R of the cross-section 12S3 satisfies the following equation (1). Note that the aspect ratio R of the cross-section 12S3 is calculated using the side extending in the X-axis direction as the denominator. R ≦ (1 / 2) tan(4π / 9) (1)

[0017] When the light emitted from the light-emitting surface 11S1 of the light-emitting element 11 follows a Lambertsian distribution, the case where light with an emission angle φ of 0° from the light-emitting surface 11S1 is emitted from the first optical element 12 without any reflection is excluded. Therefore, the tilt angle θ satisfies equation (2) below. In other words, the aspect ratio R of the cross section 12S3 satisfies equation (3) below. 　 θ≧θ Ｃ = sin －１ (1 / n) (2) R≧(1 / 2) tan(sin －１ (1 / n)) (3)

[0018] From the above, the aspect ratio R of the cross-section 12S3 of the first optical element 12 satisfies equations (1) and (3).

[0019] As shown in Figure 19B, the center of the width 2W extending in the X-axis direction in the first optical element 12 is the origin O, and the vertex of the cross section 12S3 is point P. With respect to the origin O, the XZ coordinates of point P are (D, H1). The XZ coordinates (D, H1) of point P satisfy the following equations (4) and (5). The cross-sectional area f(x) of the first optical element 12 satisfies the following equations (6) to (8). Note that sgn(x) in the equations is the sign function. H = W tan(4π / 9) (4) D ≤ |W| (5) ∫g(x) dx ≤ ∫f(x) dx ≤ ∫h(x) dx (6) g(x) = (W - |x|) tan(sin －１ (1 / n)) (7) h(x)=[{x+Wsgn(D-x)}H1] / {D+Wsgn(D-x)}(8)

[0020] As shown in Figure 19C, the light-emitting element 11 includes a light-emitting portion 111 and a sealing member 112, in order from the opposite side of the surface facing the first optical element 12. The light-emitting portion 111 is the part that emits light. The sealing member 112 is provided between the light-emitting portion 111 and the first optical element 12 and is a member that protects the light-emitting portion 111. The first optical element 12 is placed on the sealing member 112. The sealing member 112 is formed using, for example, sapphire glass or silicon.

[0021] The first optical element 12 includes a base portion 122 and an optical portion 123, in order from the light incident surface 12S1 side. When the height H2 of the base portion 122 extending in the Z-axis direction satisfies the following equation (9), multiple reflections occur within the base portion, resulting in absorption loss due to the material constituting the base portion. Therefore, to avoid absorption loss, the height H2 of the base portion 122 satisfies the following equation (10). The above are the requirements that at least a portion of the cross-section 12S3 of the first optical element 12 in the XZ plane must satisfy. H2 > 2Wtanθ Ｃ (9) H2 ≤ 2Wtanθ Ｃ (10)

[0022] The substrate 21 is made of, for example, silicon (Si). A drive circuit for driving the light-emitting element 11 is embedded in the substrate 21.

[0023] [1-2. Method for Manufacturing the Light-Emitting Device] The light-emitting device 1 of this embodiment can be manufactured, for example, as follows. Figures 3A to 3G show an example of the manufacturing process for the light-emitting device 1.

[0024] First, a mold is prepared, for example, from glass, metal, or silicon (Si). Next, a mold 31 having a bumpy structure including one or more protrusions 313 and one or more recesses 314, as shown in Figure 3A, is fabricated from the mold by, for example, cutting, photolithography, or etching back processing. The mold 31 may also be formed by a 3D printer. Here, an R-shape for tool clearance may remain at the bottom of the side. Furthermore, in the above process, a vertical wall surface is always formed at the cross-section of the bumpy structure of the mold 31. Therefore, the base portion 122 (R + vertical wall) of the first optical element 12 is formed.

[0025] Next, using the mold 31 prepared as shown in Figure 3B, a replica mold 32 is prepared, for example, including one or more protrusions 321 and a flat substrate 322. The replica mold 32 has a structure in which one or more protrusions 321 corresponding to one or more uneven structures of the mold 31 are provided on the flat substrate 322. The flat substrate 322 is formed of nickel (Ni), silicon (Si), glass, or resin. Each of the one or more protrusions 321 is formed of nickel (Ni) or resin.

[0026] Next, as shown in Figure 3C, a resin layer 33 is formed by depositing a resin material, for example, onto the surface of a wafer substrate 41 made of glass or silicon using a spin coating method, inkjet method, or dip molding method. Subsequently, using the molded replica mold 32, uneven patterns 33P are formed on multiple locations on the surface of the resin layer 33 while shifting its position (a so-called Step & Repeat molding process is performed). As a result, a wafer master mold 34 with multiple uneven patterns 33P formed on it is obtained, as shown in Figure 3D.

[0027] Next, for example, a resin material is adhered onto a wafer 113 on which a plurality of light-emitting portions such as LEDs are arranged by a spin coating method, an inkjet method, or a dip molding method to form a resin layer 114. Subsequently, as shown in FIG. 3E, by overlaying the inverted wafer master mold 34 on the resin layer 114, after forming a plurality of patterns 42P corresponding to each of the plurality of concavo-convex patterns 33P of the wafer master mold 34 on the surface of the wafer 42, it is cured by, for example, UV irradiation or heat treatment. Thereby, as shown in FIG. 3F, a wafer 42 provided with a plurality of patterns 42P on the wafer 113 is obtained.

[0028] Next, the wafer 42 is divided and individualized by, for example, stealth dicing, laser ablation, or blade dicing. Thereby, as shown in FIG. 3G, a plurality of structures 50 in which a light-emitting portion 110 including one or more light-emitting elements 11 and a resin structure 43 are laminated in order are obtained.

[0029] Next, as shown in FIG. 3H, a plurality of structures 50 are arranged on the substrate 21. Thus, the light-emitting device 1 shown in FIG. 1 is completed.

[0030] [1-3. Operation and Effects] The light-emitting device 1 of this embodiment includes a light-emitting element 11 having a light-emitting surface 11S1, a light-incident surface 12S1 facing the light-emitting surface, and a light-emitting surface 12S2 including a first inclined surface K1 and a second inclined surface K2 that form angles of less than 90° with respect to the light-emitting surface, and a first optical element 12 that overlaps with the light-emitting element 11 in the Z-axis direction perpendicular to the XY plane. In the light-emitting device 1, the area of ​​the first optical element occupied by the first optical element 12 in the XY plane is equal to or less than the area of ​​the light-emitting surface occupied by the light-emitting surface 11S1, and the entire area of ​​the first optical element occupied overlaps with the light-emitting surface 11S1 in the Z-axis direction. In the light-emitting device 1, since the area of ​​the first optical element occupied by the first optical element 12 in the XY plane is equal to or less than the area of ​​the light-emitting surface occupied by the light-emitting surface 11S1, the distance between the light-emitting elements 11 can be narrowed when multiple light-emitting elements 11 are provided. Furthermore, at least a portion of the light L emitted from the light-emitting surface 11S1 of the light-emitting element 11 is reflected by the first inclined surface K1 of the light-emitting surface 12S2 of the first optical element 12, and is refracted at an arbitrary angle and emitted from the second inclined surface K2 of the light-emitting surface 12S2. This will be explained below.

[0031] Generally, in a light-emitting device equipped with an optical element on a light-emitting element, the optical element 1012 is provided so as to cover the upper surface and outer periphery of the light-emitting element 1011 on the substrate 1021, as shown in the reference example light-emitting device 1001 in Figure 4A. The side surface 1012 S1 of the optical element 1012 has a convex shape with respect to the light-emitting element 1011 on the optical axis. The width of such an optical element 1012 is generally several centimeters. In the light-emitting device 1001, when multiple light-emitting elements 1011 are provided, the distance between the light-emitting elements 1011 must be greater than the width of the optical element 1012. Therefore, the light-emitting device 1001 is not suitable for high-density mounting.

[0032] As a reference example of a light-emitting device including an optical element on a light-emitting element, for example, there is a light-emitting device 2001 shown in FIG. 4B. In the light-emitting device 2001, an optical element 2012 is provided so as to cover the upper surface and the outer periphery of the light-emitting element 2011 on a substrate 2021. The optical element 2012 is formed by dropping a resin on the light-emitting element 2011. Due to the above-described formation method, it is difficult to form the optical element 2012 into an arbitrary shape. Therefore, the light-emitting device 2001 is not suitable for high-density mounting and light distribution control.

[0033] On the other hand, in the light-emitting device 1 of the present embodiment, as described above, the light incident surface 12S1 of the first optical element 12 overlaps with the region occupied by the light-emitting surface 11S1 of the light-emitting element 11 and has substantially the same shape as the light-emitting surface 11S1. That is, in the light-emitting device 1, since the first optical element 12 is provided only directly above the light-emitting surface 11S1 of the light-emitting element 11, mounting at a higher density is possible as compared with the light-emitting device 1001 and the light-emitting device 2001.

[0034] Further, in the light-emitting device 1 of the present embodiment, as described above, at least a part of the light L emitted from the light-emitting surface 11S1 of the light-emitting element 11 is reflected by the inclined light-emitting surface 12S2 of the first optical element 12. In particular, the light-emitting surface 12S2 of the first optical element 12 has a concave shape with respect to the light-emitting surface 11S1. As a result, the light L incident from the light incident surface 12S1 is repeatedly reflected by the left and right light-emitting surfaces 12S2 and exits from the first optical element 12 when the incident angle exceeds the critical angle. As described above, the light-emitting device 1 can control the light distribution by designing the shape of the first optical element 12, and thus is suitable for wide light distribution.

[0035] When the light-emitting device 1 of the present embodiment includes a plurality of light-emitting elements 11, it is possible to design the first optical element 12 corresponding to each light-emitting element in accordance with the characteristics and arrangement positions of the plurality of light-emitting elements 11. Thereby, a desired luminance distribution and a desired light distribution state in the light-emitting device 1 can be obtained.

[0036] <3. Modifications> Next, Modifications 1 to 7 of the present disclosure and examples of their application will be described. Note that components corresponding to the light-emitting device 1 of the above embodiment are denoted by the same reference numerals and their descriptions are omitted.

[0037] [3-1. Modification 1] Figure 5A schematically shows an example of the cross-sectional configuration of a light-emitting device (light-emitting device 1A-1) according to Modification 1 of the present disclosure. Figure 5B schematically shows another example of the cross-sectional configuration of a light-emitting device (light-emitting device 1A-2) according to Modification 1 of the present disclosure.

[0038] In the light-emitting devices 1A-1 and 1A-2 of this modified example, the light-emitting surface 12S2 of the first optical element 12 has one recess with respect to the light-incident surface 12S1, but the disclosure is not limited thereto. In the light-emitting devices 1A-1 and 1A-2 of this modified example, the light-emitting surface 12aS2 of the first optical element 12a has multiple recesses with respect to the light-incident surface 12aS1. Except for the above, the configurations of the light-emitting devices 1A-1 and 1A-2 are substantially the same as the configuration of the light-emitting device 1 of the above embodiment.

[0039] In the modified light-emitting devices 1A-1 and 1A-2, for example, if the light-emitting surface 12aS of the first optical element 12a has n recesses, the range of the light incident surface 12S1 that incident on any position on the light-emitting surface 12aS2 of the first optical element 12a is the range obtained by dividing the light incident surface 12S1 into n sections. That is, the range of incident angles of light incident on any position on the light-emitting surface 12aS2 of the first optical element 12a is also narrowed. Therefore, it becomes easier to control the direction of the emitted light so that the light incident on the light incident surface 12S1 is emitted at any angle, thus enabling efficient light distribution control.

[0040] [3-2. Modification 2] Figure 6 schematically shows an example of the cross-sectional configuration of a light-emitting device (light-emitting device 1B) according to Modification 2 of the present disclosure.

[0041] The light-emitting device 1B of this second modification example further includes a first optical layer 13 so as to cover the light-emitting surface 12S2 of the first optical element 12. The first optical layer 13 has a concave shape with respect to the light-incident surface 12S1 of the first optical element 12. The first optical layer 13 is an optical film that has an optical effect on the light emitted from the first optical element 12. The first optical layer 13 includes, for example, an optical element having a refractive index different from that of the first optical element 12, a microstructure, a diffraction grating layer, a moth-eye structure, a dielectric multilayer film, a scattering layer, and a color conversion layer. The first optical layer 13 may combine these appropriately.

[0042] In the light-emitting device 1B of this modification example, the light distribution of the light emitted from the first optical element 12 is further controlled by the first optical layer 13. As a result, more stable light distribution control than the light-emitting device 1 of the above-described embodiment becomes possible.

[0043] When the first optical layer 13 is a dielectric multilayer film, the first optical layer 13 has a structure in which films made of materials having different refractive indexes are alternately stacked, for example. Examples of the material used as the dielectric multilayer film include TiO ２ , HfO ２ , SiO ２ , and MgF ２ etc. The light-emitting device 1B includes a layer having arbitrary reflectance characteristics by controlling the film thickness, film material, and number of layers of the first optical layer 13 as the dielectric multilayer film.

[0044] Except for the above points, the configuration of the light-emitting device 1B is substantially the same as the configuration of the light-emitting device 1 of the above-described embodiment.

[0045] [3-3. Modification Example 3] FIG. 7 schematically shows an example of a cross-sectional configuration of a light-emitting device (light-emitting device 1C) according to a modification example 3 of the present disclosure.

[0046] The light-emitting device 1C of this modified example 3 further includes a second optical layer 14 between the light-emitting element 11 and the first optical element 12. The second optical layer 14 is an optical film that exerts an optical effect on the light emitted from the light-emitting element 11. Examples of the second optical layer 14 include an optical element with a refractive index different from that of the first optical element 12, a microstructure, a diffraction grating layer, a moth-eye structure, a dielectric multilayer film, a scattering layer, and a color conversion layer. The second optical layer 14 may be made by appropriately combining these elements.

[0047] In this modified light-emitting device 1C, the light distribution of the light emitted from the light-emitting element 11 is controlled by the second optical layer 14 and incident on the first optical element 12. This enables more stable light distribution control than in the light-emitting device 1 of the above embodiment.

[0048] When the second optical layer 14 is a dielectric multilayer film, the second optical layer 14 has a structure in which films made of materials with different refractive indices are alternately stacked. Examples of materials used as dielectric multilayer films include TiO ２ , HfO ２ SiO ２ , and MgF ２ Examples include the above. The light-emitting device 1C includes layers having arbitrary reflectivity characteristics by controlling the film thickness, film material, and number of layers of the second optical layer 14 as a dielectric multilayer film.

[0049] Except for the points mentioned above, the configuration of the light-emitting device 1C is substantially the same as the configuration of the light-emitting device 1 in the above embodiment.

[0050] [3-4. Modification 4] Figure 8 schematically shows an example of the cross-sectional configuration of a light-emitting device (light-emitting device 1D) according to Modification 4 of the present disclosure.

[0051] The light-emitting device 1D of this modified example 4 further comprises a third optical layer 151 that covers the light-emitting surface 12S2 of the first optical element 12 and has a flat surface 151S on the side opposite to the light-incident surface 12S1, and a fourth optical layer 152 on the flat surface 151S of the third optical layer 151. Examples of the third optical layer 151 include a transparent layer, a scattering layer, and a color conversion layer. Examples of the fourth optical layer 152 include a microstructure, a diffraction grating layer, a moth-eye structure, a lens, a dielectric multilayer film, and a scattering layer. The third optical layer 151 and the fourth optical layer 152 may be combined as appropriate.

[0052] In this modified light-emitting device 1D, the light distribution of the light emitted from the first optical element 12 is further controlled by the third optical layer 151 and the fourth optical layer 152. This enables more stable light distribution control than the light-emitting device 1 of the above embodiment.

[0053] When the fourth optical layer 152 is a dielectric multilayer film, the fourth optical layer 152 has a structure in which films made of materials with different refractive indices are alternately stacked. Examples of materials used as dielectric multilayer films include TiO ２ , HfO ２ SiO ２ , and MgF ２ Examples include the above. The light-emitting device 1D includes layers having arbitrary reflectivity characteristics by controlling the film thickness, film material, and number of layers of the fourth optical layer 152 as a dielectric multilayer film.

[0054] Except for the points mentioned above, the configuration of the light-emitting device 1D is substantially the same as the configuration of the light-emitting device 1 in the above embodiment.

[0055] [3-5. Modification 5] Figure 9A is a schematic cross-sectional view showing an enlarged portion of the first optical element 12 according to Modification 5 of the present disclosure (light-emitting device 1E). Figure 9B is a schematic cross-sectional view showing another enlarged portion of the first optical element 12 according to Modification 5 of the present disclosure (light-emitting device 1E).

[0056] In the light-emitting device 1E of this modified example 5, the first optical element 12 includes a first optical member 121 (121a, 121b) along the outer edge of the light-emitting surface 12S2. For example, the first optical member 121a shown in Figure 9A is a moth-eye structure, and the first optical member 121b shown in Figure 9B is a lens. In addition, the first optical member 121 may be, for example, a microstructure, a diffraction grating layer, a dielectric multilayer film, or a scattering layer. The first optical member 121 may be a combination of these as appropriate.

[0057] In this modified light-emitting device 1E, the light distribution of the light emitted from the first optical element 12 is further controlled by the first optical member 121. This enables more stable light distribution control than in the light-emitting device 1 of the above embodiment.

[0058] When the first optical element 121 is a dielectric multilayer film, the first optical element 121 has a structure in which films made of materials with different refractive indices are alternately stacked. Examples of materials used as dielectric multilayer films include TiO ２ , HfO ２ SiO ２ , and MgF ２ Examples include the above. The light-emitting device 1E includes layers having arbitrary reflectivity characteristics by controlling the film thickness, film material, and number of layers of the first optical member 121 as a dielectric multilayer film.

[0059] Except for the points mentioned above, the configuration of the light-emitting device 1E is substantially the same as the configuration of the light-emitting device 1 in the above embodiment.

[0060] [3-6. Modification 6] Figure 10 schematically shows an example of the cross-sectional configuration of a light-emitting device (light-emitting device 1F) according to Modification 6 of the present disclosure.

[0061] In the light-emitting device 1F of this modified example 6, a plurality of light-emitting elements 11 are provided, and one or more second optical members 16 are provided between the plurality of light-emitting elements 11. Examples of the second optical members 16 include microstructures, diffraction layers, moth-eye structures, lenses, dielectric multilayer films, scattering layers, light-reflecting layers, and color conversion layers. One or more second optical members 16 may be appropriately combined.

[0062] In this modified light-emitting device 1F, the light distribution of the light emitted from the side surface of the light-emitting element 11 and the first optical element 12 is further controlled by the second optical member 16. This enables more stable light distribution control than the light-emitting device 1 of the above embodiment.

[0063] In the light-emitting device 1F of this modified example 6, the second optical member 16 may have a heat dissipation structure such as a heat sink or a heat spreader. This makes it possible to efficiently dissipate the heat generated from the light-emitting element 11.

[0064] When the second optical element 16 is a dielectric multilayer film, the second optical element 16 has a structure in which films made of materials with different refractive indices are alternately stacked. Examples of materials used as dielectric multilayer films include TiO ２ , HfO ２ SiO ２ , and MgF ２ Examples include the above. The light-emitting device 1F includes layers having arbitrary reflectivity characteristics by controlling the film thickness, film material, and number of layers of the second optical member 16 as a dielectric multilayer film.

[0065] Except for the points mentioned above, the configuration of the light-emitting device 1F is substantially the same as the configuration of the light-emitting device 1 in the above embodiment.

[0066] [3-7. Modification 7] Figure 11A schematically shows an example of the cross-sectional configuration of the light-emitting device (light-emitting device 1G) according to Modification 7 of the present disclosure. Figure 11B schematically shows an example of the planar configuration of the light-emitting device 1G shown in Figure 11A. Figure 12A schematically shows an example of the planar configuration of the cluster of the light-emitting device 1G shown in Figure 11A. Figure 12B schematically shows another example of the planar configuration of the cluster of the light-emitting device 1G shown in Figure 11A.

[0067] The light-emitting device 1G of this modified example 7 is equipped with a plurality of light-emitting elements 11. The plurality of light-emitting elements 11 are arranged in a straight line, for example, with one red light-emitting element 11R, one green light-emitting element 11G, and one blue light-emitting element 11B in each cluster C1. The distance L2 between adjacent red light-emitting elements 11R, green light-emitting elements 11G, and blue light-emitting elements 11B is 0.5 nm or less. The light-emitting device 1G is arranged in a two-dimensional array of multiple clusters C1, for example, as shown in Figure 11B. The distance L3 between adjacent clusters C1 is, for example, 20 mm or less.

[0068] In the light-emitting device 1G of this modified example 7, as shown in Figure 12A, cluster C2 may have four light-emitting elements 11 arranged in an array, consisting of a red light-emitting element 11R, a green light-emitting element 11G, and a blue light-emitting element 11B. In the light-emitting device 1G of this modified example 7, as shown in Figure 12B, cluster C3 may have four light-emitting elements 11 arranged in an array, consisting of a red light-emitting element 11R, a green light-emitting element 11G, a blue light-emitting element 11B, and a yellow light-emitting element 11Y.

[0069] In this modified light-emitting device 1G, the first optical element 12 is designed to match the characteristics of the red light-emitting element 11R, the green light-emitting element 11G, and the blue light-emitting element 11B. This makes it possible to correct color unevenness even in a light-emitting device equipped with two or more colored light-emitting elements 11.

[0070] Specifically, for example, the light-emitting device 1G compensates for the differences in the optical characteristics (wavelength, light intensity, light distribution, etc.) of the red light-emitting element 11R, the green light-emitting element 11G, and the blue light-emitting element 11B. Alternatively, since the center positions of the red light-emitting element 11R, the green light-emitting element 11G, and the blue light-emitting element 11B are offset, their respective illumination areas are also offset. In this case, the color unevenness is corrected by making the shapes of the red light-emitting element 11R, the green light-emitting element 11G, and the blue light-emitting element 11B asymmetrical. In addition, for example, the first optical element 12 has a dispersion in refractive index, so differences occur between the red light-emitting element 11R, the green light-emitting element 11G, and the blue light-emitting element 11B. The color unevenness is corrected by designing the shapes of the red light-emitting element 11R, the green light-emitting element 11G, and the blue light-emitting element 11B.

[0071] Except for the points mentioned above, the configuration of the light-emitting device 1G is substantially the same as the configuration of the light-emitting device 1 in the above embodiment.

[0072] <4. Application Examples> (Application Example 1) Figure 13 is a perspective view showing an example of the schematic configuration of an image display device (image display device 100). The image display device 100 is a so-called LED display, and the light-emitting device of this disclosure (for example, light-emitting device 1) is used as the display pixel. The image display device 100 includes, for example, a display panel 120 and a control circuit 140 that drives the display panel 120, as shown in Figure 13.

[0073] The display panel 120 consists of a mounting substrate 120A and an opposing substrate 120B superimposed on each other. The surface of the opposing substrate 120B serves as the image display surface, with a display area (display section 100A) in the center and a non-display area, the frame section 100B, surrounding it.

[0074] Figure 14 shows an example of the wiring layout of the area corresponding to the display unit 100A on the surface of the mounting substrate 120A on the opposing substrate 120B side. On the surface of the mounting substrate 120A, in the area corresponding to the display unit 100A, a plurality of data wirings 134 are formed extending in a predetermined direction and arranged in parallel at a predetermined pitch, as shown in Figure 14. On the surface of the mounting substrate 120A, in the area corresponding to the display unit 100A, a plurality of scan wirings 135 are formed extending in a direction intersecting (for example, orthogonal to) the data wirings 134 and arranged in parallel at a predetermined pitch. The data wirings 134 and scan wirings 135 are made of a conductive material such as Cu.

[0075] The scan wiring 135 is formed, for example, on the outermost layer, and is formed on an insulating layer (not shown) formed on the surface of the substrate. The substrate of the mounting board 120A is made of, for example, a silicon substrate or a resin substrate, and the insulating layer on the substrate is made of, for example, SiN, SiO, aluminum oxide (AlO), or a resin material. On the other hand, the data wiring 134 is formed in a layer different from the outermost layer containing the scan wiring 135 (for example, a layer below the outermost layer), and is formed, for example, in an insulating layer on the substrate.

[0076] The vicinity of the intersection of the data wiring 134 and the scan wiring 135 is a display pixel 136, and multiple display pixels 136 are arranged in a matrix within the display unit 100A. Each display pixel 136 is equipped with, for example, the respective color pixels Pr, Pg, and Pb of the light-emitting device 1.

[0077] The light-emitting device 1 is provided with terminal electrodes, for example, one pair for each color pixel Pr, Pg, and Pb, or one common electrode and the other arranged for each color pixel Pr, Pg, and Pb. One terminal electrode is electrically connected to the data wiring 134, and the other terminal electrode is electrically connected to the scan wiring 135. For example, one terminal electrode is electrically connected to the pad electrode 134B at the tip of a branch 134A provided on the data wiring 134. Also, for example, the other terminal electrode is electrically connected to the pad electrode 135B at the tip of a branch 135A provided on the scan wiring 135.

[0078] Each pad electrode 134B, 135B is formed, for example, on the outermost layer and is provided in the area where each light-emitting device 1 is mounted, as shown in Figure 14. Here, the pad electrodes 134B, 135B are made of a conductive material such as Au (gold).

[0079] The mounting substrate 120A is further provided with a plurality of support columns (not shown) that, for example, regulate the distance between the mounting substrate 120A and the opposing substrate 120B. The support columns may be provided in the area facing the display unit 100A, or in the area facing the frame unit 100B.

[0080] The opposing substrate 120B is made of, for example, a glass substrate or a resin substrate. On the opposing substrate 120B, the surface on the side facing the light-emitting device 1 may be flat, but it is preferable that it be rough. The rough surface may be provided over the entire area facing the display unit 100A, or it may be provided only in the area facing the display pixels 136. The rough surface has fine irregularities that allow light emitted from the color pixels Pr, Pg, and Pb to enter the surface. The irregularities of the rough surface can be created, for example, by sandblasting or dry etching.

[0081] The control circuit 140 drives each display pixel 136 (each light-emitting device 1) based on the video signal. The control circuit 140 is composed of, for example, a data driver that drives data wiring 134 connected to the display pixel 136 and a scan driver that drives scan wiring 135 connected to the display pixel 136. The control circuit 140 may be provided separately from the display panel 120 and connected to the mounting board 120A via wiring, as shown in Figure 13, or it may be mounted on the mounting board 120A.

[0082] (Application Example 2) Figure 15 is a perspective view showing another configuration example (image display device 200) of an image display device using the light-emitting device of this disclosure (for example, light-emitting device 1). The image display device 200 is a so-called tiling display that uses a plurality of light-emitting devices with LEDs as light sources. The image display device 200 includes, for example, a display panel 220 and a control circuit 240 that drives the display panel 220, as shown in Figure 15.

[0083] The display panel 220 consists of a mounting substrate 220A and an opposing substrate 220B superimposed on each other. The surface of the opposing substrate 220B serves as the image display surface, with a display area in the center and a frame area surrounding it, which is a non-display area (neither of which is shown). The opposing substrate 220B is positioned opposite the mounting substrate 220A, for example, with a predetermined gap between them. The opposing substrate 220B may also be in contact with the upper surface of the mounting substrate 220A.

[0084] Figure 16 schematically shows an example of the configuration of the mounting board 220A. The mounting board 220A is composed of multiple unit boards 250 arranged in a tile-like pattern, as shown in Figure 16. Although Figure 16 shows an example in which the mounting board 220A is composed of nine unit boards 250, the number of unit boards 250 may be 10 or more, or 8 or less.

[0085] Figure 17 shows an example of the configuration of a unit board 250. The unit board 250 has, for example, a plurality of light-emitting devices 1 arranged in a tile-like pattern, and a support board 260 that supports each light-emitting device 1. Each unit board 250 further has a control board (not shown). The support board 260 is made of, for example, a metal frame (metal plate) or a wiring board. If the support board 260 is made of a wiring board, it can also serve as the control board. In this case, at least one of the support board 260 and the control board is electrically connected to each light-emitting device 1.

[0086] (Application Example 3) Figure 18 shows the appearance of the transparent display 300. The transparent display 300 includes, for example, a display unit 310, an operation unit 311, and a housing 312. The display unit 310 uses the light-emitting device of this disclosure (for example, light-emitting device 1). This transparent display 300 is capable of displaying images and text information while allowing the background of the display unit 310 to pass through.

[0087] In the transparent display 300, the mounting substrate is a light-transmitting substrate. Each electrode provided on the light-emitting device 1 is formed using a conductive material that is light-transmitting, similar to the mounting substrate. Alternatively, each electrode is designed to be difficult to see by reducing the width of the wiring or the thickness of the wiring. Furthermore, the transparent display 300 can display black by, for example, layering a liquid crystal layer equipped with a driving circuit, and switching between transmission and black display is possible by controlling the light distribution direction of the liquid crystal.

[0088] The present technology has been described above with reference to embodiments and modifications 1 to 7 and application examples. However, the present technology is not limited to the above embodiments, and various modifications are possible. For example, the above embodiments show examples in which the light emitted from the light-emitting element 11 is blue light or ultraviolet light, but the technology is not limited to these. For example, the light-emitting device 1 can also use a light-emitting element that emits two or more types of light, such as blue light and green light, or ultraviolet light and green light.

[0089] Furthermore, although the above embodiments have described the components constituting the light-emitting device 1, etc., it is not necessary to include all components, and other components may also be included.

[0090] Furthermore, while the above embodiments illustrate the case where a light-emitting element is provided on a substrate having a drive circuit, this disclosure is not limited thereto. For example, a light-emitting element may be provided on another substrate that does not have a drive circuit, and the drive circuit included in a separate drive substrate may be connected to the light-emitting element.

[0091] Furthermore, the effects described herein are merely examples and are not limited to those described; other effects may also occur.

[0092] This technology can also take the following configuration. According to this technology with the following configuration, the first optical element is provided only directly above the light-emitting surface of the light-emitting element, so when multiple light-emitting elements are provided, the distance between light-emitting elements can be narrowed, enabling high-density mounting. Furthermore, at least a portion of the light emitted from the light-emitting surface of the light-emitting element is reflected by the inclined light-emitting surface of the first optical element and refracted and emitted from the first optical element at an arbitrary angle. This makes it possible to control the light distribution of the light-emitting element. [1] A light-emitting device comprising: a light-emitting element having a light-emitting surface that extends along a first surface; and a first optical element having a light-incident surface facing the light-emitting surface and a light-emitting surface including a first inclined surface that makes an angle of less than 90° with respect to the light-emitting surface, and overlapping with the light-emitting element in a first direction perpendicular to the first surface, wherein the area of ​​the region occupied by the first optical element on the first surface is equal to or less than the area of ​​the region occupied by the light-emitting surface, and the entire region occupied by the first optical element overlaps with the light-emitting surface in the first direction. [2] The light-emitting device according to [1], wherein the first optical element further includes a second inclined surface that is inclined with respect to the first inclined surface and is at an angle of less than 90° with respect to the light-emitting surface. [3] The light-emitting device according to [1] or [2], wherein the shape of the light incident surface is substantially the same as the shape of the light-emitting surface. [4] The light-emitting device according to any one of [1] to [3], wherein the size of the light incident surface is substantially the same as the size of the light-emitting surface. [5] The light-emitting device according to any one of [1] to [4], wherein the light incident surface is substantially parallel to the light-emitting surface. [6] The light-emitting device according to any one of [1] to [5], wherein the light-emitting surface includes one or more recesses that are concave with respect to the light incident surface. [7] The light-emitting device according to any one of [1] to [6], further comprising a first optical layer covering the light-emitting surface, wherein the first optical layer has one or more recesses that are concave with respect to the light incident surface. [8] The light-emitting apparatus according to [7], wherein the first optical layer is at least one of an optical element having a refractive index different from that of the first optical element, a microstructure, a diffraction grating layer, a moth-eye structure, a dielectric multilayer film, a scattering layer, and a color conversion layer.[9] The light-emitting device according to any one of [1] to [8], further comprising a second optical layer between the light-emitting element and the first optical element.

[10] The light-emitting device according to [9], wherein the second optical layer is at least one of an optical element having a refractive index different from that of the first optical element, a microstructure, a diffraction grating layer, a moth-eye structure, a dielectric multilayer film, a scattering layer, and a color conversion layer.

[11] The light-emitting device according to any one of [1] to

[10] , further comprising a third optical layer provided so as to cover the light-emitting surface of the first optical element and having a flat surface on the side opposite to the light incident surface, and a fourth optical layer on the flat surface of the third optical layer.

[12] The light-emitting device according to

[11] , wherein the third optical layer is at least one of a transparent layer, a scattering layer, and a color conversion layer.

[13] The light-emitting device according to

[12] , wherein the fourth optical layer is at least one of a microstructure, a diffraction grating layer, a moth-eye structure, a lens, a dielectric multilayer film, and a scattering layer.

[14] The light-emitting device according to any one of [1] to

[13] , wherein the first optical element includes a first optical member provided along the outer edge of the light-emitting surface.

[15] The light-emitting device according to

[14] , wherein the first optical member is at least one of a microstructure, a diffraction grating layer, a moth-eye structure, a lens, a dielectric multilayer film, and a scattering layer.

[16] The light-emitting device according to any one of [1] to

[15] , comprising a plurality of the light-emitting elements, wherein one or more second optical members are provided between the plurality of light-emitting elements.

[17] The light-emitting device according to

[16] , wherein the one or more second optical members include at least one of a microstructure, a diffraction layer, a moth-eye structure, a lens, a dielectric multilayer film, a scattering layer, a light-reflecting layer, a color conversion layer, and a heat dissipation structure.

[18] A light-emitting device according to any one of [1] to

[17] , comprising a plurality of light-emitting elements, wherein the plurality of light-emitting elements include a first light-emitting element that emits light in a first wavelength range and a second light-emitting element that emits light in a second wavelength range different from the first wavelength range.

[19] A light-emitting device according to any one of [1] to

[18] , wherein when the angle between the first inclined surface of the first optical element and the light incident surface is θ and the refractive index of the first optical element is n, the following equation (1) is satisfied: θ≧θC=sin. －１(1 / n) (1)

[20] The first optical element includes a base portion on the light incident surface side, and when the width of the light incident surface of the first optical element is 2W and the height of the base portion extending in the first direction is H2, the height of the base portion is the light-emitting device according to

[19] that satisfies the following formula (2): H2 ≤ 2W tanθ Ｃ (2)

[21] The light-emitting surface includes a second inclined surface that intersects with the first inclined surface at a first intersection and makes an angle of less than 90° with respect to the light-emitting surface, and when the first distance in the first direction from the light incident surface to the first intersection is H1, and the second distance along the light incident surface from the center of the light incident surface to the first intersection is D, the first distance, the second distance and the cross-sectional area f(x) of the first optical element satisfy the following equations (3) to (7): H = W tan(4π / 9) (3) D ≤ |W| (4) ∫g(x) dx ≤ ∫f(x) dx ≤ ∫h(x) dx (5) g(x) = (W - |x|) tan(sin －１ (1 / n) (6) h(x) = [{x + Wsgn(D-x)}H] / {D + Wsgn(D-x)} (7)

[22] An image display device comprising a light-emitting device, the light-emitting device comprising: a light-emitting element having a light-emitting surface extending along a first surface; a light-incident surface facing the light-emitting surface and a light-emitting surface including a first inclined surface that makes an angle of less than 90° with respect to the light-emitting surface, and a first optical element that overlaps with the light-emitting element in a first direction perpendicular to the first surface, wherein the area of ​​the first optical element occupied region on the first surface is equal to or less than the area of ​​the light-emitting surface occupied region on the light-emitting surface, and the entire area of ​​the first optical element occupied region overlaps with the light-emitting surface in the first direction.

[0093] This application claims priority based on Japanese Patent Application No. 2024-196118, filed with the Japan Patent Office on 8 November 2024, and all contents of that application are incorporated herein by reference.

[0094] Those skilled in the art will understand that various modifications, combinations, subcombinations, and changes can be conceived depending on design requirements and other factors, and that these fall within the scope of the attached claims and their equivalents.

Claims

1. A light-emitting device comprising: a light-emitting element having a light-emitting surface extending along a first surface; and a first optical element having a light-incident surface facing the light-emitting surface and a light-emitting surface including a first inclined surface that forms an angle of less than 90° with respect to the light-emitting surface, and overlapping with the light-emitting element in a first direction perpendicular to the first surface, wherein the area of ​​the region occupied by the first optical element on the first surface is equal to or less than the area of ​​the region occupied by the light-emitting surface, and the entire region occupied by the first optical element overlaps with the light-emitting surface in the first direction.

2. The light-emitting device according to claim 1, further comprising a second inclined surface that is inclined with respect to the first inclined surface and is at an angle of less than 90° with respect to the light-emitting surface.

3. The light-emitting device according to claim 1, wherein the shape of the light incident surface is substantially the same as the shape of the light-emitting surface.

4. The light-emitting device according to claim 1, wherein the size of the light incident surface is substantially the same as the size of the light-emitting surface.

5. The light-emitting device according to claim 1, wherein the light incident surface is substantially parallel to the light-emitting surface.

6. The light-emitting device according to claim 1, wherein the light-emitting surface includes one or more recesses having a concave shape with respect to the light-incident surface.

7. The light-emitting device according to claim 1, further comprising a first optical layer covering the light-emitting surface, wherein the first optical layer has one or more recesses that form a concave shape with respect to the light-incident surface.

8. The light-emitting device according to claim 7, wherein the first optical layer is at least one of an optical element having a refractive index different from that of the first optical element, a microstructure, a diffraction grating layer, a moth-eye structure, a dielectric multilayer film, a scattering layer, and a color conversion layer.

9. The light-emitting device according to claim 1, further comprising a second optical layer between the light-emitting element and the first optical element.

10. The light-emitting device according to claim 9, wherein the second optical layer is at least one of an optical element having a refractive index different from that of the first optical element, a microstructure, a diffraction grating layer, a moth-eye structure, a dielectric multilayer film, a scattering layer, and a color conversion layer.

11. The light-emitting device according to claim 1, further comprising: a third optical layer provided so as to cover the light-emitting surface of the first optical element and having a flat surface on the side opposite to the light-incident surface; and a fourth optical layer on the flat surface of the third optical layer.

12. The light-emitting device according to claim 11, wherein the third optical layer is at least one of a transparent layer, a scattering layer, and a color conversion layer.

13. The light-emitting apparatus according to claim 12, wherein the fourth optical layer is at least one of a microstructure, a diffraction grating layer, a moth-eye structure, a lens, a dielectric multilayer film, and a scattering layer.

14. The light-emitting device according to claim 1, wherein the first optical element includes a first optical member provided along the outer edge of the light-emitting surface.

15. The light-emitting device according to claim 14, wherein the first optical component is at least one of a microstructure, a diffraction grating layer, a moth-eye structure, a lens, a dielectric multilayer film, and a scattering layer.

16. The light-emitting device according to claim 1, comprising a plurality of light-emitting elements, wherein one or more second optical members are provided between the plurality of light-emitting elements.

17. The light-emitting device according to claim 16, wherein the one or more second optical members include at least one of a microstructure, a diffraction layer, a moth-eye structure, a lens, a dielectric multilayer film, a scattering layer, a light-reflecting layer, a color conversion layer, and a heat dissipation structure.

18. The light-emitting device according to claim 1, comprising a plurality of light-emitting elements, wherein the plurality of light-emitting elements include a first light-emitting element that emits light in a first wavelength range and a second light-emitting element that emits light in a second wavelength range different from the first wavelength range.

19. The light-emitting device according to claim 1, which satisfies the following equation (1) when the angle made by the first inclined surface of the first optical element with respect to the light incident surface is θ and the refractive index of the first optical element is n: θ≧θC=sin －１ (1 / n) (1) 20. The first optical element includes a base portion on the light incident surface side, and when the width of the light incident surface of the first optical element is 2W and the height of the base portion extending in the first direction is H2, the height of the base portion satisfies the following equation (2): H2 ≤ 2W tanθ Ｃ (2) 21. The light-emitting surface includes a second inclined surface that intersects with the first inclined surface at a first intersection and makes an angle of less than 90° with respect to the light-emitting surface, and when the first distance in the first direction from the light incident surface to the first intersection is H1, and the second distance along the light incident surface from the center of the light incident surface to the first intersection is D, the first distance, the second distance, and the cross-sectional area f(x) of the first optical element satisfy the following equations (3) to (7): (3) D ≤ |W| (4) ∫g(x)dx ≤ ∫f(x)dx ≤ ∫h(x)dx (5) g(x) = (W - |x|) tan(sin －１ (1 / n)) (6) h(x)=[{x+Wsgn(D-x)}H] / {D+Wsgn(D-x)}(7) 22. An image display device comprising a light-emitting device, the light-emitting device having a light-emitting surface extending along a first surface, and a first optical element having a light incident surface facing the light-emitting surface and a light emission surface including a first inclined surface that forms an angle of less than 90° with respect to the light-emitting surface, and overlapping with the light-emitting device in a first direction perpendicular to the first surface, wherein the area of ​​the region occupied by the first optical element on the first surface is equal to or less than the area of ​​the region occupied by the light-emitting surface, and the entire region occupied by the first optical element overlaps with the light-emitting surface in the first direction.

Images