Light-emitting device, display device, camera device, and electronic device

Abstract

A light-emitting device, a display device, a camera device, and an electronic device. The light-emitting device includes: a substrate; a lens; and a light-emitting portion, which is arranged between the substrate and the lens, wherein the lens has a convex curved surface portion on the opposite side of the substrate, and in a first direction perpendicular to the substrate, the light-emitting portion is farther from the lens than the center of curvature of the curved surface portion, and when the vertex of the curved surface portion in the first direction is referred to as a first position, the end of the curved surface portion in a second direction parallel to the substrate is referred to as a second position, h represents the distance from the first position to the second position in the first direction, and r represents the distance from the first position to the second position in the second direction, h / r<0.95 is satisfied.

Description

Technical Field

[0001] The present invention relates to a light emitting device, a display device, a camera device and an electronic device. Background Art

[0002] An organic light-emitting element, also called an organic electroluminescent element (organic EL element), is an electronic element having a pair of electrodes and an organic compound layer disposed between the electrodes. Electrons and holes are injected from the pair of electrodes into the organic compound layer, thereby generating excitons of a light-emitting organic compound in the organic compound layer. When the excitons return to the ground state, the organic light-emitting element emits light.

[0003] Organic light emitting elements have made remarkable progress recently, and thus implementation of low driving voltage, various light emission wavelengths, and high-speed responsiveness, as well as reduction in thickness / weight of light emitting devices have been ongoing.

[0004] In the technology described in Japanese Patent Application Laid-Open No. 2017-17013 (Patent Document 1), a lens is provided to increase the amount of light to be extracted from an organic light-emitting device, and the diameter of the lens and the distance between the lens and the light-emitting area are specified.

[0005] However, in the technology described in Patent Document 1, the shape of the lens is not specified, and light with sufficiently high color purity cannot be extracted. Summary of the invention

[0006] The invention allows the extraction of light of high color purity.

[0007] A first aspect of the present invention provides a light-emitting device, comprising: a substrate; a lens, which is arranged above the main surface of the substrate; and a light-emitting portion, which is arranged between the main surface of the substrate and the lens, wherein the lens has a convex curved surface portion on the opposite side of the substrate, and in a first direction perpendicular to the main surface of the substrate, the light-emitting portion is arranged at a position farther from the lens than the center of curvature of the curved surface portion, and when the vertex of the curved surface portion in the first direction is called the first position, the end of the curved surface portion in a second direction parallel to the substrate is called the second position, h represents the distance from the first position to the second position in the first direction, and r represents the distance from the first position to the second position in the second direction, h / r<0.95 is satisfied.

[0008] A second aspect of the present invention provides a display device, the display device comprising: a display unit having the above-mentioned light-emitting device; and a control circuit configured to control the display unit. A third aspect of the present invention provides an imaging device, the imaging device comprising: an optical unit; an imaging element configured to receive light passing through the optical unit; and a display unit configured to display an image captured by the imaging element, wherein the display unit has the above-mentioned light-emitting device. A fourth aspect of the present invention provides an electronic device, the electronic device comprising: a display unit having the above-mentioned light-emitting device; a housing provided with the display unit; and a communication unit provided in the housing and configured to communicate with the outside world.

[0009] Further features of the present invention will become apparent from the following description of exemplary embodiments with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1A and Figure 1B are schematic diagrams schematically showing light emitting devices respectively;

[0011] Figure 2 is a schematic diagram schematically showing a light emitting device;

[0012] Figure 3A and Figure 3B are schematic diagrams schematically showing light emitting devices respectively;

[0013] Figure 4A and Figure 4B are schematic diagrams schematically showing light emitting devices respectively;

[0014] Figure 5A and Figure 5B are schematic diagrams schematically showing light emitting devices respectively;

[0015] Figure 6 is a schematic diagram schematically showing a light emitting device;

[0016] Figure 7 is a schematic diagram showing a light emitting device according to Embodiment 1;

[0017] FIG. 8A to FIG. 8C are schematic diagrams respectively showing a light emitting element array in a light emitting device according to Embodiment 1;

[0018] Fig. 9 is a schematic diagram showing a light emitting device according to Embodiment 1;

[0019] Fig.10 is a schematic diagram showing a light emitting device according to Embodiment 2;

[0020] Fig.11 is a schematic diagram showing a light emitting device according to Embodiment 3;

[0021] Fig.12 is a schematic diagram showing a light emitting device according to Embodiment 4;

[0022] Fig.13 is a schematic diagram showing a light emitting device according to Embodiment 5;

[0023] Fig.14 is a schematic diagram showing a display device according to Embodiment 6;

[0024] Fig.15A is a schematic diagram showing an imaging device according to Embodiment 6;

[0025] Fig. 15B is a schematic diagram showing an electronic device according to Embodiment 6;

[0026] Fig.16A and Fig. 16B are schematic diagrams respectively showing a display device according to Embodiment 6;

[0027] Fig.17A is a schematic diagram showing a lighting device according to Embodiment 6;

[0028] Fig. 17B is a schematic diagram showing a moving object according to Embodiment 6; and

[0029] Fig.18A and Fig.18B Schematic diagrams respectively show wearable devices according to embodiment 6. DETAILED DESCRIPTION

[0030] Implementation Method 1

[0031] Embodiment 1 of the present invention will be described. The light-emitting device according to the present embodiment has a substrate, a lens arranged on the main surface of the substrate, and a light-emitting portion arranged between the main surface of the substrate and the lens. Moreover, the lens (microlens) has a convex (protruding) curved surface portion on the opposite side (i.e., the outer side) of the substrate. Hereinafter, the direction perpendicular to the main surface of the substrate is described as the "vertical direction", and the direction parallel to the substrate is described as the "horizontal direction". In the present embodiment, it is assumed that the curved surface portion is a part of a spherical surface. Then, the vertex (end) of the curved surface portion in the vertical direction is simply described as the "vertex of the curved surface portion", and the end of the curved surface portion in the horizontal direction is simply described as the "end of the curved surface portion". Incidentally, various components other than the lens and the light-emitting portion may be provided on the substrate.

[0032] Figure 1A This is a schematic diagram schematically showing an example of a light-emitting device for comparison with the light-emitting device of this embodiment. Figure 1AThe light emitting device of the present invention comprises a substrate, a micro lens provided on the substrate, and a light emitting section provided between the substrate and the micro lens. Then, the micro lens has a convex curved surface portion 101 on the opposite side of the substrate. Figure 1A A cross section obtained by a plane in the vertical direction passing through the vertex of the curved surface portion 101 is shown.

[0033] exist Figure 1A Therefore, the distance h between the vertex of the curved surface portion 101 and the end of the curved surface portion 101 in the vertical direction and the distance r between the vertex of the curved surface portion 101 and the end of the curved surface portion 101 in the horizontal direction have the relationship of h=r.

[0034] Here, we will consider the light passing through 1 The case where light emitted from the microlens into the air with a refractive index of 1. For the light emitted into the air, the light emitted from the light emitting portion along the oblique direction (a direction not parallel to the vertical direction) and the light emitted from the light emitting portion along the front direction (a direction parallel to the vertical direction) are different in optical conditions. Therefore, the color purity of the light emitted from the light emitting portion along the oblique direction may be lower than the color purity of the light emitted from the light emitting portion along the front direction. Therefore, the greater the angle of the oblique direction relative to the front direction, the greater the reduction in the color purity of the light emitted from the light emitting portion along the oblique direction. Therefore, when observing the light emitting device from an oblique direction, light in an area where the inclination angle (angle relative to the horizontal direction) of the microlens is large is observed to have significantly reduced color purity. Figure 1A , the inclination angle β1 at the end of the curved portion 101 is close to 90 degrees. Therefore, the emission angle γ=γ1 (angle relative to the vertical direction) from the light emitting portion toward the end of the curved portion 101 is also large. Therefore, when the light emitting device is observed from an oblique direction, the light emitted from the end of the curved portion 101 is observed to have a significantly reduced color purity.

[0035] Figure 1B FIG. 1 is a schematic diagram schematically showing an example of a light emitting device according to this embodiment. Figure 1B The light emitting device of the present invention comprises a substrate, a micro lens provided on the substrate, and a light emitting section provided between the substrate and the micro lens. Then, the micro lens has a convex curved surface portion 102 on the opposite side of the substrate. Figure 1A A cross section obtained by a plane in the vertical direction passing through the vertex of the curved surface portion 102 is shown.

[0036] exist Figure 1B In the figure, the curved surface portion 102 is a part of a sphere and is smaller than a hemisphere. Therefore, the vertical distance h between the vertex of the curved surface portion 102 and the end of the curved surface portion 102 and the horizontal distance r between the vertex of the curved surface portion 102 and the end of the curved surface portion 102 have a relationship of h<r.

[0037] Here, considering the light emitted from the microlens in an inclined direction at a specific angle α, according to Snell's law, the larger the inclination angle of the microlens, the larger the emission angle γ of the light emitting portion. Therefore, the inclination angle β2 at the end of the curved portion 102 is smaller than the inclination angle β1 at the end of the curved portion 101. Therefore, the emission angle γ=γ2 from the light emitting portion toward the end of the curved portion 102 becomes smaller than the emission angle γ=γ1 from the light emitting portion toward the end of the curved portion 101. Therefore, according to Figure 1B The construction of (h<r), and Figure 1A Compared with the structure (h=r), the area where the microlens has a large inclination angle can be reduced, and the reduction in the color purity of the light emitted from the light-emitting portion in the oblique direction can be suppressed. This effect increases as the ratio of h to r, h / r, decreases. For example, preferably h / r<0.95, further preferably h / r<0.9, and more preferably h / r<0.5. On the other hand, h / r>0.2 is acceptable.

[0038] Incidentally, an example in which the curved surface portion of the microlens is a part of a spherical surface has been described. However, the actual shape of the curved surface portion does not need to be consistent with a part of a spherical surface, but may also be a part of an aspherical surface. In this case, as an actual shape, a surface that approximates a part of a spherical surface can be considered to be a curved surface portion. In a microlens, the boundary between the curved surface portion and other portions may be uncertain, such as in a case where the inclination of the microlens surface changes smoothly from the curved surface portion to the other portions or in other cases. In such a case, for example, in addition to the vertex of the curved surface portion, a portion where the inclination of the tangent line in contact with the surface of the microlens is equal to or less than a threshold value can be considered to be an end of the curved surface portion.

[0039] Then, refer to Figure 2 , Figure 3A , Figure 3B , Figure 4A , Figure 4B , Figure 5A and Figure 5B Here, we will consider the case where light is focused by a microlens. 1 The microlens emits light into the air with a refractive index of 1.

[0040] Figure 2 , Figure 3A and Figure 3B Examples of the case where the curved surface portion of the microlens is a hemispherical surface (h=r) are respectively shown.

[0041] exist Figure 2In the embodiment, the light emitting portion P1 (light emitting point) coincides with the curvature center C of the microlens (curved surface portion). In this case, the light emitted from the light emitting portion P1 is incident perpendicularly to the inclined surface of the microlens. Therefore, the light emitted from the light emitting portion P1 is emitted from the microlens into the air while maintaining the direction (angle). In other words, the focusing effect cannot be obtained.

[0042] Figure 3A and Figure 3B , respectively, show examples of the case where the light emitting portion is located away from the microlens in the vertical direction. Figure 3A As shown in FIG. 1 , light emitted from the center position P2 of the light emitting portion (a position that coincides with the curvature center C of the microlens in the horizontal direction) in an oblique direction passes through the microlens and is closer to the front direction. Therefore, a focusing effect can be obtained. Figure 3B As shown, as the light emitted from the position P2' at the end of the light-emitting portion, there is light closer to the front direction through the microlens. Compared with the case where the microlens is not provided, the focusing effect can increase the light intensity in the front direction and improve the current utilization efficiency of the light-emitting portion. In addition, a high focusing effect relative to the vicinity of the center of the light-emitting portion can be obtained. Therefore, the smaller the light-emitting portion, the higher the current utilization efficiency can be set.

[0043] Figure 4A and Figure 4B , respectively, show examples of the case where the light emitting portion is further away from the microlens in the vertical direction. Figure 4A As shown in FIG. 1 , the focusing effect of light emitted from the center position P3 of the light emitting portion to the vertex of the microlens (curved surface portion) and its surroundings is enhanced. However, the light emitted to the end of the microlens (curved surface portion) and its surroundings is totally reflected by the microlens and is not extracted into the air. In addition, as Figure 4B As shown, there is light emitted from position P3' at the end of the light emitting unit, which is totally reflected by the microlens and not extracted. Therefore, the current utilization efficiency of the light emitting unit is reduced.

[0044] From the description so far, it is important to appropriately set the distance in the vertical direction between the center of curvature C of the microlens and the light emitting portion in order to improve the current utilization efficiency of the light emitting portion.

[0045] Figure 5A and Figure 5B Examples of the case where the curved surface portion of the microlens is a part of a spherical surface and is smaller than a hemispherical surface (h<r), in other words, examples of the configuration according to the present embodiment are respectively shown. Figure 3A , Figure 3B Same as Figure 5A and Figure 5BIn the vertical direction, the light-emitting part is disposed at a position farther from the microlens than the curvature center C of the microlens (curved surface part). This can also be understood as that in the vertical direction, the curvature center C of the microlens (curved surface part) is disposed between the microlens (curved surface part) and the light-emitting part.

[0046] When it is desired that the condensing effect of the microlens with respect to the center position P4 of the light-emitting part is the same as that of Figure 3A it is only necessary that the ratio d / R of the curvature radius R of the microlens (curved surface part) and the distance d in the vertical direction between the curvature center C of the microlens and the light-emitting part is the same as that in Figure 3A Specifically, in order to obtain the condensing effect, it is only necessary to satisfy the following expression (1), and in order to suppress total reflection at the microlens, it is only necessary to satisfy the following expression (2). The curvature radius R is calculated by the following expression (3). In addition, the ratio r / R of the distance r to the curvature radius R is preferably less than 0.97. On the other hand, r / R can be greater than 0.4.

[0047] d / R>0…(1)

[0048] d / R<1…(2)

[0049] R=(r 2 + h 2 ) / 2h … (3)

[0050] Here, the case where the distance r is equal between Figure 3A , Figure 3B and Figure 5A , Figure 5B will be considered. In this case, Figure 5A and Figure 5B the curvature radius R in the structure of (h<r) is larger than Figure 3A and Figure 3B the curvature radius R in the structure of (h=r). Therefore, when it is desired that the condensing effect of the microlens with respect to the center position P4 of the light-emitting part is the same as that of Figure 3A the distance d = d4 in Figure 5A and Figure 5B becomes larger than the distance d = d2 in Figure 3A and Figure 3B . At this time, the position where the light emission of the light-emitting part is equivalent to the light emission at the position P2’ becomes the position P4’ shown in Figure 5B . The distance between the center position P4 and the position P4’ of the light-emitting part is larger than the distance between the center position P2 and the position P2’ of the light-emitting part.

[0051] As described above, the smaller the light-emitting part, the higher the current utilization efficiency of the light-emitting part can be set. As shown in Figure 5A and Figure 5B , the size of the light-emitting part and Figure 3A and Figure 3B has the same dimensions as, i.e., the position of the end portion of the light-emitting portion is set to be closer to the center than the position P4'. As a result, the light-emitting portion becomes relatively small with respect to the microlens. Therefore, compared with the configurations of Figure 3A and Figure 3B (h = r), the current utilization efficiency can be improved.

[0052] So far, compared with the case of a microlens with h = r, a microlens with h < r can suppress a decrease in color purity when the light-emitting device is observed from an inclined direction. In addition, the current utilization efficiency of the light-emitting portion can be improved.

[0053] Other conditions (conditions different from Expression (1) and Expression (2)) for obtaining the aforementioned effects when a microlens with h < r is provided will be described. Figure 6 is a schematic diagram schematically showing an example of the light-emitting device according to the present embodiment. In Figure 6 , h < r. Here, the refractive index n from the light-emitting portion to the microlens 2 is equal to the refractive index n of the microlens 1 . In this case, in order to obtain a condensing effect with respect to the center position of the light-emitting portion, it is only necessary to satisfy the condition (H > R), that is, the distance H in the vertical direction between the vertex of the microlens and the light-emitting portion is greater than the curvature radius R of the microlens. When the refractive index n 1 and the refractive index n 2 are different, the light is bent due to the difference between the refractive index n 1 and the refractive index n 2 . When the distance H is adjusted according to the relative optical distance in consideration of this, the condition for obtaining the condensing effect is expressed by the following Expression (4). The satisfaction of Expression (4) is substantially synonymous with the satisfaction of Expression (1).

[0054] [Mathematical formula 1]

[0055]

[0056] Incidentally, when a plurality of members (layers) having different refractive indices are provided between the light-emitting portion and the microlens, the weighted average refractive index (average refractive index) of the plurality of members obtained using the weights according to the thickness (layer thickness) of each member can be used as the refractive index n 2 . The refractive index of the member having the largest thickness among the plurality of members can be used as the refractive index n 2 . For example, the refractive index of the protective layer described later is about 1.98, and the refractive index of the color filter is about 1.64. Therefore, the refractive index n 2 is not less than 1.6 and not greater than 2.0. Preferably, the refractive index n 2Not less than 1.65 and not greater than 1.9. More preferably, the refractive index n 2 is not less than 1.74 and not greater than 1.8.

[0057] In addition, when n 1 = n 2 , in order to obtain the effect that the light from the center position of the light-emitting part to the end part of the microlens is not totally reflected, it is sufficient to satisfy n1×sinθ < 1. sinθ is represented by the following expression (5).

[0058] sinθ = (H - R) × R -1 × sinγ = (H - R) × R -1 × r × {r 2 + (H - h) 2} -1 / 2 …(5)

[0059] Therefore, the condition for suppressing total reflection is expressed as the following expression (6).

[0060] n 1 × (H - R) × R -1 × r × {r 2 + (H - h) 2} -1 / 2 < 1…(6)

[0061] As described above, when the refractive index n 1 and the refractive index n 2 are different, the distance H can be adjusted only according to the relative optical distance, and the condition for suppressing total reflection is expressed as the following expression (7). The satisfaction of expression (7) is roughly synonymous with the satisfaction of expression (2).

[0062] [Mathematical formula 2]

[0063]

[0064] So far, when observing the light-emitting device from an inclined direction, satisfying h < r, expression (4) and expression (7) can suppress the reduction of color purity and can improve the current utilization efficiency of the light-emitting part.

[0065] As described above, when the curved surface part of the microlens is not a part of a spherical surface, for example, when the curvature of the end part is smaller than the curvature of the spherical surface, or when the curved surface part is a part of an aspherical surface, for the actual shape, the surface approximated to a part of a spherical surface can be regarded as the curved surface part. For example, assuming that the spherical surface passes through the vertex of the microlens and the position on the microlens at a vertical direction distance of h / 2 from the vertex, the distance r and the radius of curvature R can be defined based on the assumed spherical surface. That is, it can be defined as r = (2 × r’ 2 - h 2 / 2)1 / 2 And R=(r' 2 +h 2 / 4) / h, where r' represents the horizontal distance between the following point and the vertex of the microlens: the vertical distance from the vertex of the microlens at this point is h / 2.

[0066] Specific example of implementation mode 1

[0067] A specific example of Embodiment Mode 1 will be described. Figure 7 is a schematic diagram showing a light emitting device 100 according to the present embodiment. Figure 7 A cross section obtained by a plane in the vertical direction passing through the vertex of the microlens 17 (curved surface portion) is shown. Here, an example of an organic light-emitting element (a light-emitting element including an organic light-emitting material in its light-emitting portion), which is also called an organic electroluminescent element (organic EL element), is described. However, the configuration of the light-emitting device is not limited thereto. For example, the light-emitting element may be an inorganic EL element including an inorganic light-emitting material at its light-emitting portion. As the light-emitting portion, a light-emitting diode or the like may be used.

[0068] The light-emitting device 100 has a substrate 8, a plurality of first electrodes 9, an organic layer 10 (organic film), a second electrode 11, a plurality of insulating layers 12, a protective layer 13, a planarization layer 14, a plurality of color filters 15, a planarization layer 16, and a microlens 17. A plurality of first electrodes 9 are provided on the substrate 8. The organic layer 10 includes a light-emitting layer, and a portion of the organic layer 10 (the light-emitting layer) serves as a light-emitting portion. The organic layer 10 is provided between the substrate 8 and the microlens 17 so as to cover the plurality of first electrodes 9. The second electrode 12 is provided on the organic layer 10. The organic layer 10 (the light-emitting portion) emits light by the potential difference between the first electrode and the second electrode. A plurality of insulating layers 12 (banks) are provided at the plurality of first electrodes 9, respectively, so as to establish insulation between the plurality of first electrodes 9. Each of the plurality of insulating layers 12 has an opening (opening portion) for exposing its corresponding first electrode 9 to the organic layer 10. Incidentally, the plurality of insulating layers 12 can be understood as an insulating layer provided in contact with the ends of the plurality of first electrodes 9, and can be understood as the insulating layer having a plurality of openings so as to expose the plurality of first electrodes 9 respectively. At the openings, the first electrode 9 and the organic layer 10 are in contact with each other, and the portion of the organic layer 10 corresponding to the opening of the insulating layer 12 becomes a light-emitting portion. Figure 7In the embodiment, a plurality of light-emitting portions corresponding to the plurality of first electrodes 9 are provided, and the openings of the insulating layer 12 expose the corresponding first electrodes 9 to the light-emitting portions corresponding to the first electrodes 9. A protective layer 13 is provided on the second electrode 11, and a planarization layer 14 is provided on the protective layer 13. A plurality of color filters 15 are provided on the planarization layer 14 so as to correspond to the plurality of light-emitting portions respectively. A planarization layer 16 is provided on the plurality of color filters 15. A microlens 17 has a plurality of curved surface portions corresponding to the plurality of light-emitting portions respectively, and is provided on the planarization layer 16.

[0069] The material of the substrate 8 is not particularly limited as long as it is a material capable of supporting the first electrode 9, the organic layer 10, and the second electrode 11. For example, glass, plastic silicon, etc. can be used as the material of the substrate 8. Switching elements such as transistors, wiring, interlayer insulating films, etc. can be provided at the substrate 8.

[0070] The first electrode 9 may be transparent or opaque. When the first electrode 9 is opaque, the material of the first electrode 9 is preferably a metal material having a reflectivity of 70% or more at the emission wavelength. For example, as the material of the first electrode 9, a metal such as Al or Ag, or an alloy obtained by adding Si, Cu, Ni, Nd, etc. thereto, may be used. Alternatively, as the material of the first electrode 9, ITO, IZO, AZO, IGZO, etc. may also be used. Incidentally, the emission wavelength here refers to the spectral range of light emitted from the organic layer 10. When the reflectivity of the first electrode 9 is higher than the specified (expected) reflectivity, the first electrode 9 may be a stacked electrode having a barrier electrode of a metal such as Ti, W, Mo or Au, or an alloy thereof, or may be a stacked electrode having a transparent oxide film electrode of ITO, IZO, etc.

[0071] On the other hand, when the first electrode 9 is transparent, a reflective layer may be provided below the first electrode 9 (on the side where the substrate 8 is located). As a material for the transparent first electrode 9, for example, ITO, IZO, AZO, IGZO, etc. may be used. In order to optimize the optical distance described later, as a structure of the first electrode 9, a structure in which an insulating film is provided between the reflective layer and the transparent conductive film may be adopted.

[0072] The second electrode 11 has light transmittance. The material of the second electrode 11 may be a semi-transmissive material having a property of transmitting a portion of the light reaching the surface of the second electrode 11 and reflecting the other portion of the light (i.e., semi-transmissive reflectivity). As the material of the second electrode 11, for example, a transparent material such as a transparent conductive oxide may be used. In addition, as the material of the second electrode 11, a semi-transmissive material including a single metal (such as aluminum, silver, or gold), an alkali metal (such as lithium or cesium), an alkaline earth metal (such as magnesium, calcium, or barium), an alloy material including a metal material, or the like may be used. When a semi-transmissive material is used as the material of the second electrode 11, an alloy including magnesium or silver as a main component is preferably used as the semi-transmissive material. When the second electrode 11 has a preferred transmittance, the second electrode 11 may have a stacked structure of a plurality of layers formed of the material. Although in Figure 7 Although one second electrode 11 shared by a plurality of light-emitting portions is provided, a plurality of second electrodes 11 respectively corresponding to the plurality of light-emitting portions may be provided.

[0073] One of the first electrode 9 and the second electrode 11 functions as a positive electrode, and the other functions as a negative electrode. For example, the first electrode 9 functions as a positive electrode, and the second electrode 11 functions as a negative electrode. The first electrode 9 may function as a negative electrode, and the second electrode 11 may function as a positive electrode.

[0074] The organic layer 10 may be formed by a known technique such as vacuum evaporation or spin coating. The organic layer 10 may include a plurality of layers. When the organic layer 10 is an organic compound layer, the organic layer 10 includes at least one of a hole injection layer, a hole transport layer, an electron blocking layer, a light emitting layer, a hole blocking layer, an electron transport layer, and an electron injection layer.

[0075] The light-emitting layer emits light by the recombination of holes injected from the positive electrode and electrons injected from the negative electrode. The light-emitting layer can be a single layer or a multilayer. A combination of a light-emitting layer containing a red light-emitting material, a light-emitting layer containing a green light-emitting material, and a light-emitting layer containing a blue light-emitting material can provide white light generated by mixing the light (red light, green light, and blue light) from each light-emitting layer. Two light-emitting layers of corresponding luminescent colors with complementary color relationships (for example, a light-emitting layer containing a blue light-emitting material and a light-emitting layer containing a yellow light-emitting material) can be combined. The material contained in the light-emitting layer and the structure of the light-emitting layer can be changed so that the light-emitting layer can emit light of different colors to each light-emitting portion. In this case, each light-emitting layer of each light-emitting portion can be patterned.

[0076] The light emitting device according to this embodiment may include a first reflection surface, a second reflection surface, and a light emitting layer disposed between the first reflection surface and the second reflection surface. The first reflection surface may be the first electrode 9 or may be a reflection layer disposed between the first electrode 9 and the insulating layer 12 .

[0077] In order to optimize the optical distance between the first reflection surface and the light-emitting portion (light-emitting position) of the organic layer 10 including the light-emitting layer, only the following expression (8) may be satisfied. In expression (8), Lr is the optical path length (optical distance) from the upper surface of the first reflection surface to the light-emitting position of the organic layer 10, φr is the phase shift when the light of wavelength λ is reflected by the first reflection surface, and m is an integer greater than 0. Only the film thickness of the first electrode 9 or the first reflection surface, the film thickness of the organic layer 10, etc. may be optimized so as to satisfy expression (8).

[0078] Lr=(2×m-(φr / πλ))×(λ / 4)…(8)

[0079] Furthermore, the optical distance Ls from the light emitting position to the second reflecting surface satisfies the following expression (9), where φs represents a phase shift when light of wavelength λ is reflected by the second reflecting surface. In the present embodiment, m'=0.

[0080] Ls=(2×m'-(φs / π))×(λ / 4)=-(φs / π)×(λ / 4)…(9)

[0081] Therefore, overall-layer interference L satisfies the following expression (10). In expression (10), φ is the sum of phase shift φs and phase shift φs.

[0082] L=Lr+L=(2×m-φ / π)×(λ / 4)…(10)

[0083] Here, in expressions (8) to (10), the allowable range is about λ / 8, or about 20 nm. Incidentally, the light-emitting position of the organic layer 10 may be difficult to identify. Therefore, in the aforementioned example, the light-emitting position is replaced with the interface on the first reflective surface side or the interface on the second reflective surface side of the organic layer 10. Considering the aforementioned allowable range, the effect of enhancing light can be obtained even in such a replacement case.

[0084] The protective layer 13 is an insulating layer and has light transmittance, and preferably contains an inorganic material with low transmittance to external oxygen and moisture. For example, silicon nitride (SiN), silicon oxynitride (SiON), silicon oxide (SiO X ), aluminum oxide (Al 2 O 3 ) and titanium oxide (TiO 2 ) and the like to manufacture the protective layer 13. In particular, inorganic materials such as SiN, SiON and Al are preferred in terms of protective performance. 2 O 3In order to form the protective layer 13, a chemical vapor deposition method (CVD method), an atomic layer deposition method (ALD method), a sputtering method, or the like is preferably used.

[0085] The protective layer 13 may have a single layer structure, or may have a laminated structure obtained by combining the aforementioned materials and formation methods, as long as it has sufficient moisture blocking performance. For example, the protective layer 13 may have a laminated structure of a silicon nitride layer and other layers having high density produced by an atomic layer deposition method. In addition, when the protective layer 13 has moisture blocking performance, it may have an organic layer. The organic layer includes, for example, polyacrylate, polyimide, polyester, or epoxy resin. In addition, in Figure 7 In the embodiment, one protective layer 13 is provided which is shared by a plurality of light emitting portions. However, a plurality of protective layers 13 may be provided which correspond to the plurality of light emitting portions, respectively.

[0086] The microlens 17 can be formed by exposure and development processing. Specifically, a film (photoresist film) including a material for the microlens 17 is formed. Exposure and development of the photoresist film are performed using a mask with a continuously changing grayscale. As such a mask, a gray mask can be used. An area gradation mask can also be used, which includes a light-shielding film with a resolution equal to or less than the resolution of the exposure device, and by changing the density distribution of the points, the light application has a continuous grayscale change on the imaging surface. In addition, the microlens 17 formed by the exposure and development processing is etched back. This makes it possible to adjust the lens shape. As described above, the microlens 17 may have only a curved surface portion with h<r, and the curved surface portion may be part of a spherical surface or may not be.

[0087] The light-emitting portion, the curved surface portion of the microlens 17, etc. are combined to form a light-emitting element. When a plurality of light-emitting elements are provided, the planar array (array observed from the vertical direction) of the plurality of light-emitting elements may be any array such as a stripe array, a square array, a delta array, a checkered array, a Bayer array, etc. FIG. 8A to FIG. 8C Each of them is a plan view of the light emitting device 100 viewed from the side where the microlens 17 is located, and each shows an example of a planar array of a plurality of light emitting elements. Fig. 8A An example of a delta array is shown. Figure 8B An example of a strip array is shown, Figure 8C An example of the Bayer array is shown. Here, a case where the light emitting device 100 is used as a display panel and one pixel (main pixel) includes a plurality of sub-pixels corresponding to different color components (for example, a sub-pixel for displaying red, a sub-pixel for displaying green, and a sub-pixel for displaying blue). In this case, Figure 8BAs shown, multiple light-emitting elements can be set for one sub-pixel. The size and shape of the curved surface portion of the microlens 17 can be appropriately set according to the planar array system of multiple light-emitting elements. When a delta array is used, the curved surface portion of the microlens 17 can be set large relative to the area occupied by the sub-pixel, thereby improving the light extraction efficiency.

[0088] exist FIG. 8A to FIG. 8C In the example of , the planar shape of the light-emitting portion (the shape viewed from the vertical direction) is a circle. The planar shape of the light-emitting portion is not particularly limited, and may be, for example, a polygon such as a rectangle or a hexagon. However, when the planar shape of the light-emitting portion is a circle, the inclination angle in the direction from the end of the light-emitting portion to the end of the microlens 17 (curved portion) has the following relationship that facilitates the design of the light-emitting portion: it is equal in each cross section obtained by a plane in the vertical direction passing through the vertex of the curved portion.

[0089] like Fig. 9 As shown, the microlens 17 may be formed so that the end of the curved surface portion of the microlens 17 has a thickness (so that the microlenses 17 partially overlap each other between adjacent light-emitting portions). In addition, in this case, when the conditions of h<r, expression (4) and expression (7) are satisfied, the reduction in color purity when the light-emitting device is observed from an oblique direction can be suppressed, and the current utilization efficiency of the light-emitting portion can be improved.

[0090] Alternatively, a structure in which multiple curved surface portions of the microlens 17 emit light of different colors can be adopted. This structure can achieve full-color display. As a method for achieving full-color display, a method using a light-emitting layer that emits white light and a color filter 15 can be adopted, or a method in which the light-emitting layer is patterned so that multiple light-emitting parts emit light of different colors can be adopted. Alternatively, full-color display can be achieved by changing the distance between the first reflection surface and the second reflection surface of each light-emitting part. By adopting a structure in which the distance between the first reflection surface and the second reflection surface is changed for each light-emitting part, the light-emitting layer can be shared among multiple light-emitting parts. Therefore, compared with the method of patterning the light-emitting layer, the light-emitting layer manufacturing method becomes easier.

[0091] In the present embodiment, although the color filter 15 is disposed on the planarization layer 14, the color filter 15 may be disposed on the protective layer 13. In other words, the color filter 15 and the protective layer 13 may be integral with each other (the color filter 15 and the protective layer 13 may be continuous). The color filter 15 may be formed on another substrate and may be bonded to the protective layer 13 in a facing manner. The planarization layer 14 is provided so as to planarize the concavities and convexities of the protective layer 13. The color filter 15 and the protective layer 13 are integral with each other. As a result, the color filter 15 may be formed in high-precision alignment with the light-emitting portion using a photolithography process.

[0092] exist Figure 7 In the embodiment, the color filters 15r, 15g and 15b may be color filters for transmitting light of different colors, or they may not be color filters. For example, the color filter 15r may transmit red light, the color filter 15g may transmit green light, and the color filter 15b may transmit blue light. This structure can realize full-color display. By the way, part or all of the multiple color filters 15 may be omitted. In this case, it is also possible to form the light-emitting layers in the organic layer 10 differently so that the colors of the light emitted by the multiple light-emitting parts are different from each other, thereby realizing full-color display.

[0093] In addition, in the present embodiment, although the microlens 17 is provided on the planarization layer 16, the microlens 17 may be provided on the color filter 15. In other words, the microlens 17 and the color filter 15 may be integrated with each other. The planarization layer 16 is provided to flatten the concavoconvexity of the color filter 15. The microlens 17 may be provided on the protective layer 13 without using the color filter 15 (the microlens 17 and the protective layer 13 may be integrated with each other). When the microlens 17 and the protective layer 13 are integrated with each other, the distance from the microlens 17 to the light-emitting layer is shorter than when the microlens 17 is formed on another substrate and attached to the protective layer 13 in a facing manner. As a result, the solid angle of light incident from the light-emitting layer to the microlens 17 can be enlarged, thereby improving the light extraction efficiency. By integrating the microlens 17 and the protective layer 13 with each other, the curved surface portion of the microlens 17 can be formed in high-precision alignment with the light-emitting portion. In addition, the color filter 15 , the microlens 17 , and the protective layer 13 are integrated, which enables alignment among the light emitting portion, the color filter 15 , and the microlens 17 to be performed with high precision.

[0094] The stacking order of the color filter 15 and the microlens 17 can be appropriately selected. Figure 7 , the color filter 15 is provided on the side of the light emitting portion relative to the microlens 17. With this configuration, light emitted from the light emitting portion passes through the color filter 15 before entering the microlens 17. As a result, light causing a decrease in color purity (light with a large emission angle from the light emitting portion) passes through the color filter 15 over a relatively large distance. Therefore, when the light emitting device 100 is observed from an oblique direction, a decrease in color purity can be more preferably suppressed.

[0095] Alternatively, the light-emitting device 100 can be manufactured by forming the color filter 15 and the microlens 17 on another substrate and bonding them to the substrate 8 having the light-emitting portion in a facing manner. In this way, the degree of freedom of the processing method (such as temperature) for forming the color filter 15 and the microlens 17 is increased, so that the degree of freedom of design of the color filter 15 and the microlens 17 can be increased. The microlens 17 and the color filter 15 are fixed to the side where the substrate 8 is located by, for example, an adhesive. The adhesive can be applied on the protective layer 13, or can be applied on the planarization layer 14.

[0096] In addition, the microlens 17 can be fixed on the substrate 8 at the end of the light emitting device 100 by an adhesive, thereby providing a space between the microlens 17 and the protective layer 13 (or the color filter 15). In that case, the space can be filled with a filling resin. The refractive index of the filling resin is preferably less than the refractive index of the microlens 17.

[0097] Alternatively, it is acceptable that: the color filter 15 is integrally formed on the protective layer 13; and the microlens 17 is formed on another substrate and attached to the color filter 15 in an opposing manner.

[0098] A specific example of a method for manufacturing the light emitting device 100 will be described below.

[0099] First, aluminum is formed on the substrate 8 and patterned to form a plurality of first electrodes 9. Then, a plurality of insulating layers are formed so as to cover the plurality of first electrodes 9, respectively. As the material of the insulating layer, silicon oxide is used, and the thickness of the insulating layer is set to 65 nm. Then, in each insulating layer, an opening for exposing its corresponding first electrode 9 (the covered first electrode 9) is provided, and the plurality of insulating layers are assumed to be a plurality of insulating layers 12. The shape of the opening is set to a circle with a radius of 3.0 μm. As described above, ultimately, the opening of the insulating layer 12 exposes its corresponding first electrode 9 relative to the light-emitting portion corresponding to the first electrode 9. When viewed from a vertical direction, the size and shape of the opening are consistent with the size and shape of the light-emitting portion.

[0100] Then, an organic layer 10 (organic compound layer) is formed on the first electrode 9 (and the insulating layer 12). Specifically, as a hole injection layer, the following compound 1 is formed with a thickness of 3 nm. Then, as a hole transport layer, the following compound 2 is formed with a thickness of 15 nm, and as an electron blocking layer, the following compound 3 is formed with a thickness of 10 nm. Then, a first light-emitting layer is formed with a thickness of 10 nm so as to contain the following compound 4 as a main material at a weight ratio of 97% and the following compound 5 as a light-emitting dopant at a weight ratio of 3%. A second light-emitting layer is formed with a thickness of 10 nm so as to contain the following compound 4 as a main material at a weight ratio of 98% and the following compound 6 and the following compound 7 as light-emitting dopants at a weight ratio of 1%, respectively. An electron transport layer with a thickness of 110 nm is formed using the following compound 8. An electron injection layer with a thickness of 1 nm is formed using lithium fluoride.

[0101] [Chemistry 1]

[0102]

[0103] Then, a MgAg alloy with a thickness of 10 nm was formed as the second electrode 11 on the organic layer 10. The ratio of Mg to Ag was set to 1:1. Subsequently, a SiN film with a thickness of 1 μm and a refractive index of 1.97 was formed as the protective layer 13 on the second electrode 11 by a CVD method. In addition, a planarization layer 14 with a thickness of 300 nm and a refractive index of 1.55 was formed on the protective layer 13 by spin coating.

[0104] Then, on the planarization layer 14, a color filter 15 having a refractive index of 1.65 is formed with a thickness of 1.6 μm. Assume that the color filter 15r is a color filter for transmitting red light, assume that the color filter 15g is a color filter for transmitting green light, and assume that the color filter 15b is a color filter for transmitting blue light. In addition, on the color filter 15, a planarization layer 16 having a thickness of 200 nm is formed by spin coating.

[0105] Then, a microlens 17 having a refractive index of 1.52 is formed on the planarized layer 16 using exposure and development processing. Assuming that the curved surface portion of the microlens 17 is a portion of a spherical surface, the distance h between the vertex of the curved surface portion and the end of the curved surface portion is set to 2.5 μm, and the distance r in the horizontal direction is set to 3.4 μm.

[0106] With the light emitting device 100 manufactured as described above, the radius of curvature R of the microlens 17 (curved surface portion) is (r 2 +h 2 ) / 2h is 3.56 μm. Then, the refractive index n of the microlens 17 is 1 is 1.52, and the refractive index n from the light emitting portion to the microlens 17 is 2 is 1.74, and the distance H in the vertical direction from the vertex of the microlens 17 to the light-emitting portion is 5.6 μm. At this time, the left side of expression (4) is calculated as 1.45, and the left side of expression (7) is calculated as 0.46, thereby satisfying expressions (4) and (7). Therefore, the reduction in color purity when the light-emitting device is observed from an oblique direction can be suppressed. In addition, compared with the case where the microlens 17 is not provided, the current utilization efficiency of the light-emitting portion can be improved.

[0107] Implementation Method 2

[0108] Embodiment 2 of the present invention will be described. In Embodiment 1 (specific example), the shape of the light emitting portion (when viewed from a vertical direction) is set to a circle with a radius of 3.0 μm. However, in this embodiment, the shape of the light emitting portion is set to a circle with a radius of 1.0 μm. Except for this, Embodiment 2 is the same as Embodiment 1. Fig.10 is a schematic diagram showing a light emitting device 100 according to the present embodiment. Fig.10A cross section obtained by a plane in the vertical direction passing through the vertex of the microlens 17 (curved surface portion) is shown.

[0109] As described above, when the microlens 17 is disposed on the light-emitting portion, a high light-gathering effect can be obtained for the position directly below the vertex of the microlens 17 (curved portion). That is, by making the light-emitting portion smaller, the current utilization efficiency of the light-emitting portion can be improved. Here, in order to obtain the effect that the light emitted from the light-emitting portion in the vertical direction is not totally reflected by the inclined surface of the microlens 17, only the following expression (11) can be satisfied.

[0110] a <R / n 1 …(11)

[0111] Here, "a" represents the distance in the horizontal direction from the end of the light emitting portion to the vertex of the microlens 17 (curved surface portion).

[0112] In this embodiment, the distance a=1.0 μm, and R / n 1 =2.34μm, so a is satisfied <R / n 1 Therefore, while suppressing total reflection at the microlens 17, the light-emitting portion is made smaller. As a result, the current utilization efficiency of the light-emitting portion can be further improved. From the perspective of obtaining such an effect, for example, a / (R / n 1 ) is preferably 0.85 or less. On the other hand, a / (R / n 1 ) can be greater than 0.6.

[0113] Implementation 3

[0114] Embodiment 3 of the present invention will be described. In Embodiment 2, the shape of the light emitting portion is set to a circle with a radius of 1.0 μm. However, in this embodiment, the shape of the light emitting portion is set to a circle with a radius of 2.0 μm. Except for this, Embodiment 3 is the same as Embodiment 2. Fig.11 2 is a schematic diagram showing a light emitting device 100 according to the present embodiment. Fig.11 A cross section obtained by a plane in the vertical direction passing through the vertex of the microlens 17 (curved surface portion) is shown.

[0115] Here, the process in which light with high color purity emitted from the light-emitting portion in the front direction is refracted by the inclined surface of the microlens 17 to be extracted in the wide-angle direction (inclined direction) will be considered. In view of such a process, the larger the angle of the inclined surface of the microlens 17 close to the light-emitting portion, the more the reduction in color purity when the light-emitting device 100 is observed from an inclined direction can be suppressed, which is preferred. That is, when the shape of the microlens 17 is the same, the larger the distance a in the horizontal direction from the end of the light-emitting portion to the microlens 17 (curved surface portion), the more the reduction in color purity when the light-emitting device 100 is observed from an inclined direction can be suppressed.

[0116] In this embodiment, by satisfying a<R / n 1 By increasing the distance a while maintaining the relationship between the two, the current utilization efficiency of the light-emitting portion can be improved. In addition, the decrease in color purity when the light-emitting device 100 is observed from an oblique direction can be further suppressed. From the perspective of obtaining such an effect, for example, a / (R / n 1 ) is preferably greater than 0.6.

[0117] Implementation 4

[0118] Embodiment 4 of the present invention will be described. In Embodiment 1 (specific example), the thickness of protective layer 13 (SiN film) is set to 1 μm. However, in this embodiment, the thickness of protective layer 13 (SiN film) is set to 1.5 μm. Except for this, Embodiment 4 is the same as Embodiment 1. Fig.12 is a schematic diagram showing a light emitting device 100 according to the present embodiment. Fig.12 A cross section obtained by a plane in the vertical direction passing through the vertex of the microlens 17 (curved surface portion) is shown.

[0119] When the thickness of the protective layer 13 (SiN film) is set to 1.5 μm, n 2 =1.79 and H=6.6 μm. Also, in this case, Expression (4) and Expression (7) are satisfied.

[0120] Here, the process in which light emitted from the center position of the light emitting portion toward the end of the microlens 17 (curved surface portion) is refracted by the end of the microlens 17 will be considered. Considering such a process, when the distance r of the microlens 17 is constant, the greater the distance in the vertical direction from the light emitting portion to the microlens 17, the smaller the emission angle of the light from the light emitting portion becomes. Therefore, it is possible to further suppress the reduction in color purity when the light emitting device 100 is observed from an oblique direction.

[0121] In this embodiment, light emitted from the light-emitting portion in a wide-angle direction (light with low color purity) is totally reflected by the microlens 17 (curved surface portion) of the adjacent sub-pixel and is not extracted to the outside. Therefore, by increasing the vertical distance from the light-emitting portion to the microlens 17 (curved surface portion), it is possible to further suppress the reduction in color purity when the light-emitting device 100 is observed from an oblique direction.

[0122] Implementation method 5

[0123] Embodiment 5 of the present invention will be described. In this embodiment, the distance from the light emitting portion to the color filter 15, in other words, the optical distance until the light emitted from the light emitting portion reaches the color filter 15, varies between the plurality of light emitting portions. Except for this, Embodiment 5 is the same as Embodiment 4. Fig.132 is a schematic diagram showing a light emitting device 100 according to the present embodiment. Fig.13 A cross section obtained by a plane in the vertical direction passing through the vertex of the microlens 17 (curved surface portion) is shown.

[0124] A specific example of the light-emitting device 100 according to the present embodiment will be described. First, aluminum is formed on the substrate 8 and patterned to manufacture a plurality of reflective layers 18. Then, the formation and patterning of an insulating layer formed of silicon oxide are repeated to form a plurality of insulating films 19 having different layer thicknesses on the plurality of reflective layers 18, respectively. Specifically, for a portion where a color filter 15r for transmitting red light is to be provided, an insulating film 19 having a layer thickness of 75 nm is formed; and for a portion where a color filter 15g for transmitting green light is to be provided, an insulating film 19 having a layer thickness of 130 nm is formed. Then, for a portion where a color filter 15b for transmitting blue light is to be provided, an insulating film 19 having a layer thickness of 190 nm is formed. Then, an ITO film is formed and patterned to form a plurality of first electrodes 9 on the plurality of insulating films 19, respectively. Subsequently, the light-emitting device 100 is manufactured in the same manner as in Embodiment 1 (Specific Example). However, the shape of the opening of the insulating layer 12, in other words, the shape of the light-emitting portion (when viewed from the vertical direction) is set to a circle with a radius of 1.5 μm. In addition, in the organic layer 10, the thickness of the hole transport layer is set to 36 nm, and the thickness of the electron transport layer is set to 45 nm. Then, the protective layer 13 is formed so that the upper surface position of the protective layer 13 in the vertical direction (the position on the side where the color filter 15 is located) becomes uniform. The thickness of the protective layer 13 is different between the multiple light-emitting portions, and is set to approximately 1.5 μm as in Embodiment 4.

[0125] In this embodiment, the distance from the light emitting portion to the color filter 15, in other words, the optical distance until the light emitted from the light emitting portion reaches the color filter 15 is set according to the desired color component (the color component to be extracted to the outside). This can improve the intensity and color purity of the light emitted from the light emitting device 100 in the front direction. In addition, the current utilization efficiency of the light emitting portion can be further improved, and the reduction in color purity when the light emitting device 100 is observed from an oblique direction can be further suppressed.

[0126] Implementation 6

[0127] Embodiment 6 of the present invention will be described. In this embodiment, examples in which the light emitting device 100 according to Embodiments 1 to 5 is applied to various devices will be described.

[0128] Fig.141 is a schematic diagram of a display device 1000 showing an example of a display device according to the present embodiment. The display device 1000 may have a touch panel 1003, a display panel 1005, a frame 1006, a circuit substrate 1007, and a battery 1008 between an upper cover 1001 and a lower cover 1009. The display panel 1005 is a display portion having any one of the light-emitting devices 100 according to Embodiments 1 to 5, and performs display using light emitted from the light-emitting device 100. The touch panel 1003 and the display panel 1005 are connected to flexible printed circuits FPCs 1002 and 1004, respectively. The circuit substrate 1007 includes a control circuit (on which transistors are printed) and performs various controls such as control of the display panel 1005. Unless the display device is a portable device, it is not necessary to provide the battery 1008, or even when the display device is a portable device, the battery 1008 may be provided at another location. The display device 1000 may have three color filters corresponding to red, green, and blue, respectively. Multiple color filters can be configured in a delta array.

[0129] The display device 1000 can be used for a display portion of a portable terminal. In that case, the display device 1000 can have both a display function and an operation function. As the portable terminal, a cellular phone such as a smartphone, a tablet computer, a head-mounted display, etc. can be mentioned.

[0130] The display device 1000 can be used for the display portion of an imaging device, which has an optical portion including a plurality of lenses and an imaging element for receiving light passing through the optical portion. The imaging device may have a display portion for displaying information acquired by the imaging element (such as an image captured by the imaging element). In addition, the display portion may be a display portion exposed to the outside of the imaging device, or may be a display portion configured in a viewfinder. The imaging device may be a digital camera, a digital video camera, etc.

[0131] Fig.15A 1 is a schematic diagram of an imaging device 1100 for illustrating an example of an imaging device according to the present embodiment. The imaging device 1100 may have a viewfinder 1101, a rear display 1102, an operation unit 1103, and a housing 1104. The viewfinder 1101 may have a display device according to the present embodiment (the display device has any one of the light emitting devices 100 according to embodiments 1 to 5 and uses light emitted from the light emitting device 100 for display). In that case, the display device may display not only an image to be imaged but also environmental information, imaging instructions, and the like. The environmental information may be the intensity of external light, the direction of external light, the moving speed of a subject, the possibility of a subject being blocked by an obstruction, and the like. The rear display 1102 may also have a display device according to the present embodiment.

[0132] The preferred timing for photographing is an extremely short time, and thus information should be displayed as quickly as possible. Therefore, a display device using an organic light-emitting element having a high response speed is preferably used. A display device using an organic light-emitting element can be more preferably used in a device that requires a display speed higher than a liquid crystal display device.

[0133] The camera device 1100 has an optical unit not shown. The optical unit has a plurality of lenses and forms an image of light on an image pickup element housed in the housing 1104. The plurality of lenses can be focused by adjusting their respective relative positions. This operation can also be performed automatically. The camera device 1100 can also be referred to as a photoelectric conversion device. The photoelectric conversion device can include a method of detecting a difference from a previous image instead of performing continuous imaging, a method of cutting off a portion of a recorded image, or other methods as an imaging method.

[0134] Fig. 15B 1 is a schematic diagram of an electronic device 1200 showing an example of an electronic device according to the present embodiment. The electronic device 1200 has a display portion 1201, an operation portion 1202, and a housing 1203. The display portion 1201 has any one of the light-emitting devices 100 according to embodiments 1 to 5, and displays using light emitted from the light-emitting device 100. The electronic device 1200 may have a circuit, a printed substrate having the circuit, a battery, and a communication portion for communicating with the outside in the housing 1203. The operation portion 1202 may be a button, or may be a touch panel system reaction portion. The operation portion may be a liveness recognition portion for unlocking by identifying a fingerprint, etc. An electronic device having a communication portion may also be referred to as a communication device. The electronic device may also have a camera function by including a lens and an imaging element. The image captured by the camera function is projected on the display portion. As the electronic device, a smart phone, a notebook personal computer, etc. may be mentioned.

[0135] Fig.16A 1 is a schematic diagram showing a display device 1300 as an example of a display device according to this embodiment. The display device 1300 is a display device such as a TV monitor or a PC monitor. The display device 1300 has a frame 1301, a display portion 1302, and a base 1303 for supporting the frame 1301 and the display portion 1302. The display portion 1302 has any one of the light-emitting devices 100 according to Embodiments 1 to 5, and performs display using light emitted from the light-emitting device 100. The form of the base 1303 is not limited to Fig.16A The lower side of the frame 1301 may also be used as the base 1303. Alternatively, the frame 1301 and the display portion 1302 may be curved. The radius of curvature may be not less than 5000 mm and not more than 6000 mm.

[0136] Fig. 16B1 is a schematic diagram of a display device 1310 showing an example of another display device according to the present embodiment. The display device 1310 is a so-called foldable display device that is configured to be bendable. The display device 1310 has a first display portion 1311, a second display portion 1312, a housing 1313, and a bending point 1314. Each of the first display portion 1311 and the second display portion 1312 has any one of the light-emitting devices 100 according to embodiments 1 to 5, and displays using light emitted from the light-emitting device 100. The first display portion 1311 and the second display portion 1312 may be one display device without a seam. The first display portion 1311 and the second display portion 1312 may be separated from each other at a bending point. The first display portion 1311 and the second display portion 1312 may display different images, respectively, or the first display portion 1311 and the second display portion 1312 may display one image.

[0137] Fig.17A 14 is a schematic diagram of a lighting device 1400 showing an example of a lighting device according to the present embodiment. The lighting device 1400 may have a housing 1401, a light source 1402, a circuit substrate 1403, an optical film 1404, and a light diffusion portion 1405. The light source 1402 has any one of the light-emitting devices 100 according to embodiments 1 to 5. The optical film 1404 may be a filter (optical filter) for improving the color rendering of the light source 1402. The light diffusion portion 1405 may effectively diffuse the light from the light source 1402, and may transmit the light to a wide range as in lighting, etc. The optical film 1404 and the light diffusion portion 1405 may be provided on the light-emitting side of the lighting device 1400. If necessary, a cover may be provided on the outermost side.

[0138] The lighting device 1400 is a device for illuminating, for example, the interior of a room. The lighting device 1400 can emit light of white, natural white, or other colors (any color from blue to red). White is a color with a color temperature of 4200K, and natural white is a color with a color temperature of 5000K. The lighting device 1400 may have a dimming circuit for modulating the light emission color of the lighting device 1400. The lighting device 1400 may have a power supply circuit connected to the light source 1402. The power supply circuit is a circuit that converts an AC voltage into a DC voltage. In addition, the lighting device 1400 may have a color filter. In addition, the lighting device 1400 may have a heat dissipation unit. The heat dissipation unit radiates heat in the device to the outside of the device, and metals with high specific heat, liquid silicon, etc. may be mentioned.

[0139] Fig. 17B 1 is a schematic diagram showing a car 1500 which is an example of a moving object according to the present embodiment. The car 1500 may include a tail light 1501 which is an example of a lighting device. The tail light 1501 is lit in response to a brake operation or the like.

[0140] The taillight 1501 has any one of the light emitting devices 100 according to embodiments 1 to 5. The taillight 1501 may have a protective member for protecting the light emitting device 100. The material of the protective member is not important as long as it has a certain high strength and is transparent. However, the protective member preferably includes polycarbonate or the like. Polycarbonate may be mixed with a furandicarboxylic acid derivative, an acrylonitrile derivative, or the like.

[0141] The automobile 1500 may have a vehicle body 1503 and a window 1502 mounted on the vehicle body 1503. The window 1502 may be a transparent display unless it is a window for checking the front and rear of the automobile 1500. The transparent display may have any one of the light-emitting devices 100 according to Embodiments 1 to 5. In this case, constituent materials such as electrodes included in the light-emitting device 100 include a transparent member.

[0142] The mobile object according to this embodiment may be a ship, an airplane, a drone, etc. The mobile object may have a fuselage and a lamp arranged on the fuselage. The lamp may emit light to indicate the position of the fuselage. The lamp has any one of the light emitting devices 100 according to embodiments 1 to 5.

[0143] The display device according to this embodiment (a display device having any one of the light-emitting devices 100 according to Embodiments 1 to 5 and performing display using light emitted from the light-emitting device 100) is also applicable to wearable devices such as smart glasses, HMDs, and smart contact lenses. The display device according to this embodiment is also applicable to systems having wearable devices, etc. An imaging display device used as a wearable device, etc., has an imaging device capable of photoelectrically converting visible light and a display device capable of emitting visible light.

[0144] Fig.18A 1 is a schematic diagram showing glasses 1600 (smart glasses) as an example of a wearable device according to the present embodiment. An imaging device 1602 such as a CMOS sensor or a SPAD is provided on the front surface side of a lens 1601 of the glasses 1600. In addition, a display device according to the present embodiment (a display device having any one of the light emitting devices 100 according to Embodiments 1 to 5 and performing display using light emitted from the light emitting device 100) is provided on the back side of the lens 1601.

[0145] The glasses 1600 also have a control device 1603. The control device 1603 serves as a power source for supplying power to the camera 1602 and the display device. In addition, the control device 1603 controls the operation of the camera 1602 and the display device. In the lens 1601, an optical system for converging light onto the camera 1602 is formed.

[0146] Fig.18B 1 is a schematic diagram of glasses 1610 (smart glasses) showing an example of a wearable device according to the present embodiment. Glasses 1610 have a control device 1612. A camera corresponding to the camera 1602 and a display device according to the present embodiment are mounted on the control device 1612. In the lens 1611, the camera in the control device 1612 and an optical system for projecting light emitted from the display device are formed, and an image is projected on the lens 1611. The control device 1612 acts as a power source for powering the camera and the display, and controls the operation of the camera and the display.

[0147] The control device may have a line of sight detection unit for detecting the line of sight of the wearer of the glasses 1610. In order to detect the line of sight, infrared rays may be used. The infrared light emitting unit emits infrared light toward the eyeball of the user who is carefully viewing the displayed image. The light reflected from the eyeball in the emitted infrared light is detected by the camera unit having a light receiving unit, thereby generating a captured image of the eyeball. Including a reduction unit for reducing the light from the infrared light emitting unit to the display unit in a plan view can reduce the quality degradation of the image projected from the display device onto the lens 1611. The line of sight of the user relative to the displayed image is detected from the captured image of the eyeball obtained by the infrared light camera. For detecting the line of sight using the captured image of the eyeball, a known method may be applied. As an example, a line of sight detection method based on a Purkinje image may be used, which is caused by the reflection of the irradiated light at the cornea. More specifically, a line of sight detection process based on the pupil-cornea reflection method is performed. The pupil-corneal reflection method is used to calculate a sight line vector indicating the direction (rotation angle) of the eyeball based on the Purkinje image and the pupil image included in the captured image of the eyeball, thereby detecting the user's sight line.

[0148] Incidentally, when display control is performed based on visual recognition detection (line of sight detection), the lighting device 100 according to Embodiments 1 to 5 is preferably applicable to smart glasses having a camera for photographing the outside. Smart glasses can display photographed external information in real time.

[0149] By the way, the display device according to the present embodiment (a display device having any one of the light-emitting devices 100 according to embodiments 1 to 5 and using light emitted from the light-emitting device 100 for display) has a camera including a light receiving unit, and can control the display image based on the line of sight information of the user from the camera. Specifically, based on the line of sight information, a first observation area that the user looks at carefully and a second observation area other than the first observation area are determined. The first observation area and the second observation area can be determined by the control device of the display device, or the observation area determined by the external control device can be received by the display device. In the display area of ​​the display device, the display resolution of the first observation area can be controlled to be higher than the display resolution of the second observation area. In other words, the resolution of the second observation area can be set to be lower than the resolution of the second observation area.

[0150] Alternatively, it is also acceptable that the display area has a first display area and a second display area different from the first display area, and a higher priority area is determined from the first display area and the second display area based on the line of sight information. The first display area and the second display area may be determined by a control device of the display device, or a display area determined by an external control device may be received by the display device. The resolution of the high priority area may be set higher than the resolution of areas other than the high priority area. In other words, the resolution of the relatively lower priority area may be reduced.

[0151] By the way, in order to determine the first observation area and the area with high priority, AI can be used. AI can be a model that is constructed to estimate the angle of sight and the distance to the subject outside the sight from the image of the eyeball, taking the image of the eyeball and the direction in which the eyeball of the image is actually looking as teaching data. The AI ​​program can be included in the display device, can be included in the camera device, or can be included in the external device. When the external device has the AI ​​program, the information is transmitted to the display device via communication.

[0152] So far, the light emitting device 100 according to Embodiments 1 to 5 is used for various devices. As a result, display with good image quality can be performed, and good light emission can be performed.

[0153] According to the present invention, light with high color purity can be extracted.

[0154] While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. The scope of the following claims is to be accorded the broadest interpretation so as to encompass all such modifications, equivalent structures and functions.

Claims

1. A light-emitting device, comprising: a substrate; a lens disposed above a main surface of the substrate; and a light-emitting portion disposed between the main surface of the substrate and the lens, characterized in that the lens has a convex curved surface portion on the opposite side of the substrate, in a first direction perpendicular to the main surface of the substrate, the light-emitting portion is disposed at a position farther from the lens than the center of curvature of the curved surface portion, when the vertex of the curved surface portion in the first direction is referred to as a first position, the end of the curved surface portion in a second direction parallel to the substrate is referred to as a second position, h represents the distance in the first direction from the first position to the second position, and r represents the distance in the second direction from the first position to the second position, h / r < 0.5 is satisfied, and 0 < d / R < 1 is satisfied, where d represents the distance in the first direction from the light-emitting portion to the center of curvature of the curved surface portion and R represents the radius of curvature of the curved surface portion.

2. The light emitting device according to claim 1, wherein When R represents the radius of curvature of the curved surface portion, r / R < 0.97 is satisfied.

3. The light emitting device according to claim 1, wherein: When n1 represents the refractive index of the lens, n2 represents the refractive index from the light-emitting portion to the lens, H represents the distance in the first direction from the first position to the light-emitting portion, and R represents the radius of curvature of the curved surface portion, [Mathematical formula 1] is satisfied.

4. The light-emitting device according to claim 1, wherein when n1 represents the refractive index of the lens, n2 represents the refractive index from the light-emitting portion to the lens, H represents the distance in the first direction from the first position to the light-emitting portion, and R represents the radius of curvature of the curved surface portion, [Mathematical formula 2] is satisfied.

5. The light emitting device according to claim 3, wherein: The refractive index n2 is not less than 1.6 and not greater than 2.

0.

6. The light emitting device according to claim 1, wherein: When n1 represents the refractive index of the lens, R represents the radius of curvature of the curved surface portion, and a represents the distance in the second direction from the first position to the end of the light-emitting portion, a < R / n1 is satisfied.

7. The light emitting device according to claim 6, wherein: a / (R / n1) ≤ 0.85 is satisfied.

8. The light-emitting device according to claim 1, further comprising: a first electrode disposed on the substrate; and a second electrode disposed on the light-emitting portion, wherein the light-emitting portion emits light due to a potential difference between the first electrode and the second electrode.

9. The light-emitting device according to claim 8, comprising: a plurality of first electrodes; an insulating layer disposed in contact with respective ends of the plurality of first electrodes; and an organic layer covering the plurality of first electrodes and including a plurality of light-emitting portions, wherein the insulating layer has a plurality of openings to respectively expose the plurality of first electrodes, and at the openings, the first electrodes and the organic layer are in contact with each other.

10. A display device, comprising: a display portion having the light-emitting device according to any one of claims 1 to 9; and a control circuit configured to control the display portion.

11. An imaging device, comprising: an optical portion; an imaging element configured to receive light passing through the optical portion; and A display unit configured to display an image captured by the image pickup element, wherein the display unit has the light emitting device according to any one of claims 1 to 9.

12. An electronic device comprising: A display unit having a light emitting device according to any one of claims 1 to 9; a housing provided with the display portion; and The communication unit is disposed in the housing and is configured to communicate with the outside.

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