Light-emitting device, display device, photoelectric conversion device, electronic device, and wearable device

Abstract

To provide a technique advantageous for reducing visibility of color shift.SOLUTION: A light-emitting device includes, on a principal surface of a substrate, a luminous layer and a plurality of light-emitting elements having a light extraction structure disposed to cover the luminous layer. The plurality of light-emitting elements include a red light-emitting element emitting red light, a green light-emitting element emitting green light and a blue light-emitting element emitting blue light. The light-emitting device further has a resonator structure according to each luminous color. When a normal direction resonant peak wavelength of the principal surface in the resonator structure of the green light-emitting element is denoted by λon_g [nm], and a peak wavelength of emission spectrum of the green light-emitting element is denoted by λg [nm], and when a normal direction resonant peak wavelength of the principal surface in the resonator structure of the blue light-emitting element is denoted by λon_b [nm], and a peak wavelength of the emission spectrum of the blue light-emitting element is denoted by λb [nm], Δg=λon_g-λg>0 [nm], Δb=λon_b-λb>0 [nm] and Δg-Δb≥0 [nm] are satisfied.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a light-emitting device, a display device, a photoelectric conversion device, an electronic device, and a wearable device. [Background technology]

[0002] Patent document 1 discloses a configuration of the resonant wavelengths of the optical resonator structures in red, green, and blue light-emitting elements in a multi-color display device having light-emitting elements with an optical resonator structure, in order to reduce color shift at wide viewing angles. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2007-316611 A Summary of the Invention [Problem to be solved by the invention]

[0004] In a light-emitting device, a light extraction structure such as a microlens may be provided to cover a light-emitting element having an optical resonator structure in order to increase light extraction efficiency for the purpose of reducing power consumption, etc. In a light-emitting element having a light extraction structure, the light extraction structure changes optical conditions such as color mixing with adjacent light-emitting elements and total reflection conditions, and the relationship between the resonant wavelength and color shift changes.

[0005] An object of the present invention is to provide a technique that is advantageous for reducing the visibility of color shift. [Means for solving the problem]

[0006] In view of the above problems, a light emitting device according to an embodiment of the present invention includes a plurality of light emitting elements arranged on a main surface of a substrate, each of which includes a light emitting layer and a light extraction structure arranged to cover the light emitting layer, the plurality of light emitting elements including a red light emitting element that emits red light, a green light emitting element that emits green light, and a blue light emitting element that emits blue light, and the light emitting device has a resonator structure corresponding to each of the emitted colors, wherein when a resonance peak wavelength in the normal direction to the main surface of the resonator structure of the green light emitting element is λon_g [nm], a peak wavelength of an emission spectrum of the green light emitting element is λg [nm], a resonance peak wavelength in the normal direction to the main surface of the resonator structure of the blue light emitting element is λon_b [nm], and a peak wavelength of the emission spectrum of the blue light emitting element is λb [nm], Δg=λon_g-λg>0[nm] Δb=λon_b-λb>0[nm] 15[nm]≧ Δg-Δb≧0[nm] The present invention is characterized in that: Effect of the Invention

[0007] According to the present invention, it is possible to provide a technique that is advantageous in reducing the visibility of color shift. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a plan view showing an example of the configuration of a light emitting device according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a cross-sectional view showing a configuration example of the light emitting device in FIG. [Diagram 3] FIG. 2 is a diagram illustrating light rays from the light-emitting device in FIG. [Figure 4] 2A to 2C are diagrams illustrating color shift in the light emitting device of FIG. 1. [Diagram 5] 2 is a diagram showing an example of the arrangement of light-emitting positions and microlenses of the light-emitting device of FIG. 1; [Figure 6] 2 is a graph showing the emission angle and the relative light amount of the light emitting layer of the light emitting device of FIG. 1. [Figure 7] FIG. 2 shows an emission spectrum of the light-emitting device of FIG. [Figure 8]1A to 1C are diagrams illustrating an example and a comparative example of the present embodiment. [Figure 9] 1A to 1C are diagrams illustrating an example and a comparative example of the present embodiment. [Figure 10] 1A to 1C are diagrams illustrating an example and a comparative example of the present embodiment. [Figure 11] 1A to 1C are diagrams illustrating an example and a comparative example of the present embodiment. [Figure 12] 1A to 1C are diagrams illustrating an example and a comparative example of the present embodiment. [Figure 13] 2 is a cross-sectional view showing a configuration example of a pixel of the light-emitting device in FIG. [Figure 14] FIG. 1 is a diagram showing an example of an image forming apparatus using a light emitting device according to an embodiment of the present invention. [Figure 15] FIG. 1 is a diagram showing an example of a display device using the light-emitting device of this embodiment. [Figure 16] FIG. 1 is a diagram showing an example of a photoelectric conversion device using a light emitting device according to an embodiment of the present invention. [Figure 17] 1A to 1C are diagrams illustrating examples of electronic devices using the light-emitting device of this embodiment. [Figure 18] FIG. 1 is a diagram showing an example of a display device using the light-emitting device of this embodiment. [Figure 19] FIG. 1 is a diagram showing an example of a lighting device using the light-emitting device of the present embodiment. [Figure 20] FIG. 1 is a diagram showing an example of a moving object using the light emitting device of the present embodiment. [Figure 21] FIG. 1 is a diagram showing an example of a wearable device using the light emitting device of the present embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, the embodiments will be described in detail with reference to the attached drawings. Note that the following embodiments do not limit the invention according to the claims. Although the embodiments describe a number of features, not all of these features are essential to the invention, and the features may be combined in any manner. Furthermore, in the attached drawings, the same reference numbers are used for the same or similar configurations, and duplicated descriptions are omitted.

[0010] A light emitting device according to an embodiment of the present disclosure will be described with reference to Figs. 1(a) to 12. In the present disclosure, in a light emitting element having a light extraction structure, the resonance peak wavelength in the normal direction of the main surface of the substrate of a green light emitting element and a blue light emitting element is made larger than the peak wavelength of the emission spectrum. Furthermore, the difference between the resonance peak wavelength of the green light emitting element and the peak wavelength of the emission spectrum is made larger than the difference between the resonance peak wavelength of the blue light emitting element and the peak wavelength of the emission spectrum. Thereby, the color shift on the wide-angle side where the viewing angle when viewing the light emitting element is large is shifted to the blue side along the blackbody locus. As a result, the visibility of the color shift of white on the wide-angle side can be reduced.

[0011] 1(a) and 1(b) are plan views of a light-emitting device 100 in this embodiment, and FIGS. 2(a) and 2(b) are cross-sectional views of the light-emitting device 100. In the light-emitting device 100, a plurality of light-emitting elements 103 are arranged on a main surface 140 of a substrate 110, each of which includes an organic layer 112 including a light-emitting layer and a light extraction structure 104 (e.g., a microlens 119) arranged to cover the organic layer 112. By arranging the light-emitting elements 103 that emit different colors, the light-emitting device 100 functions as, for example, a display device that displays an image. The light-emitting device 100 includes a display region 101 in which the light-emitting elements 103 are arranged in a two-dimensional array. The arrangement of the light-emitting elements 103 shown in FIG. 1(a) is a delta arrangement, but may be a stripe arrangement, a square arrangement, a pentile arrangement, a Bayer arrangement, or the like. A central portion 102 of the display region 101 is indicated by a dashed line in FIG. 1(a).

[0012] FIG. 1(b) is an enlarged view of the central portion 102 in FIG. 1(a). In the configuration shown in FIG. 1(b), the center of the light-emitting region of the light-emitting element 103 coincides with the center of the light extraction structure 104 in the orthogonal projection onto the main surface 140 of the substrate 110. In this embodiment, the light-emitting region of the light-emitting element 103 is hexagonal, but the shape of the light-emitting region is not limited to a hexagon. When the light-emitting region of the light-emitting element 103 is polygonal, the center of the light-emitting region may be the center of an inscribed circle of the polygon. Also, for example, when the light-emitting region of the light-emitting element 103 is circular, the center of the light-emitting region of the light-emitting element 103 may be the center of a circle.

[0013] FIG. 2(a) is a cross-sectional view taken along line A-A' in FIG. 1(a) and FIG. 1(b). Here, the cross-sectional view is a layout diagram showing a cross section of the light-emitting device 100 in a normal direction to the main surface 140 of the substrate 110. FIG. 2(a) shows an example in which a microlens 119 having a shape protruding in a normal direction to the main surface 140 of the substrate 110 is arranged as the light extraction structure 104 of the light-emitting device 100. The light-emitting element 103 includes a reflective electrode 111, an organic layer 112 including a light-emitting layer, a semi-transparent electrode 113, a protective layer 114, and a microlens 119 on the substrate 110 in this order. In this embodiment, the light-emitting element 103 is a so-called organic electroluminescence (EL) element. However, the light-emitting element 103 is not limited to an organic EL element, and may be an inorganic EL element, a semiconductor laser element, a light-emitting diode (LED), or the like.

[0014] The reflective electrode 111 and the semi-transparent electrode 113 may be referred to as a lower electrode and an upper electrode, respectively, based on their positions. The light-emitting element 103 has a resonator structure in which light emission is reinforced by an optical distance 125 between the reflective electrode 111 and the semi-transparent electrode 113. The optical distances 125r, 125g, and 125b are set so as to reinforce desired wavelengths according to the respective light emission colors of the red light-emitting element 103r, the green light-emitting element 103g, and the blue light-emitting element 103b.

[0015] When the organic layer 112 including the light-emitting layer has a common thickness across each light-emitting element 103 and the light-emitting layer emits white light, the resonator structure can be optimized by the thickness of the optical adjustment layers 122r, 122g, and 122b and the transparent electrode 123 electrically connected to the reflective electrode 111. In that case, as shown in FIG. 2(a), a color filter 120 may be provided between the protective layer 114 and the microlens 119. However, this is not limited thereto, and a light-emitting layer that emits a different color for each light-emitting element 103 may be provided in the organic layer 112. When a light-emitting layer that emits a different color is provided for each light-emitting element 103, the thickness of the organic layer may be optimized for each light-emitting element 103, and the optical adjustment layers 122r, 122g, and 122b and the color filter 120 may not be provided.

[0016] The light emitting device 100 includes an insulating layer 116 that functions as a bank that covers the outer edge of the transparent electrode 123 and exposes the center of the transparent electrode 123. The insulating layer 116 can determine the shape of the light emitting region of the light emitting element 103 described above.

[0017] Light emitted from a light-emitting layer disposed in the organic layer 112 is incident on the microlens 119. The microlens 119 may have a shape that protrudes toward the main surface 140 of the substrate 110, as shown in Fig. 2(b). In that case, the color filter 120 may be disposed between the microlens 119 and the protective glass 121, or between the microlens 119 and the protective layer 114.

[0018] The substrate 110 may be made of any material that can support the reflective electrode 111, the organic layer 112, the semi-transparent electrode 113, and the like. For example, glass, plastic, silicon, and the like can be used as the substrate 110. The substrate 110 may be provided with a switching element such as a transistor, a wiring pattern, an interlayer insulating layer, and the like.

[0019] The reflective electrode 111 may be made of, for example, a metal material having a reflectance of 70% or more for the emission wavelength of the light emitting layer disposed in the organic layer 112. The reflective electrode 111 may be made of a metal such as aluminum or silver, or an alloy of these metals with added silicon, copper, nickel, neodymium, or the like. In addition, as long as the reflectance is higher than the desired one, the reflective electrode 111 may have a laminated structure of a barrier electrode and a metal such as titanium, tungsten, molybdenum, or gold or an alloy of these metals, or a laminated structure including a transparent conductive oxide layer such as ITO or IZO.

[0020] As shown in FIG. 2(a), a transparent electrode 123 electrically connected to the reflective electrode 111 is disposed on the reflective electrode 111. For example, ITO, IZO, AZO, IGZO, etc. can be used for the transparent electrode 123. In FIG. 2(a), an optical adjustment layer 122 is disposed between the reflective electrode 111 and the transparent electrode 123 for the purpose of optimizing the optical distance 125 in each light-emitting element 103 for each color. As shown in FIG. 2(a), the film thicknesses of the optical adjustment layers 122r, 122g, and 122b are optimized so as to create a condition for constructive interference of light near the peak wavelengths of the emission spectra of the red light-emitting element 103r, the green light-emitting element 103g, and the blue light-emitting element 103b. This can dramatically increase the emission intensity. In the configuration shown in FIG. 2(a), the peak wavelengths of the emission spectra of the red light-emitting element 103r, the green light-emitting element 103g, and the blue light-emitting element 103b can be determined, for example, by the color filter 120. For example, the color filter 120r included in the red light emitting element 103r may transmit light of 600 nm or more and 650 nm or less, the color filter 120g included in the green light emitting element 103g may transmit light of 500 nm or more and 550 nm or less, and the color filter 120b included in the blue light emitting element 103b may transmit light of 440 nm or more and 480 nm or less. As a result, the peak wavelength of the emission spectrum of the red light emitting element 103r may be 600 nm or more and 650 nm or less, the peak wavelength of the emission spectrum of the green light emitting element 103g may be 500 nm or more and 550 nm or less, and the peak wavelength of the emission spectrum of the blue light emitting element 103b may be 440 nm or more and 480 nm or less. Furthermore, the peak wavelength of the red emission spectrum may be 615 nm or more and 640 nm or less, the peak wavelength of the green emission spectrum may be 520 nm or more and 540 nm or less, and the peak wavelength of the blue emission spectrum may be 450 nm or more and 470 nm or less.

[0021] The semi-transparent electrode 113 is disposed on the organic layer 112 and has a translucent property. The semi-transparent electrode 113 has a property of transmitting a part of light that reaches the surface of the semi-transparent electrode 113 and reflecting the other part (i.e., semi-transparent reflectivity). For example, a transparent material such as a transparent conductive oxide may be used as the semi-transparent electrode 113. For example, aluminum, silver, gold, alkali metals such as lithium and cesium, alkaline earth metals such as magnesium, calcium, and barium, and alloys containing these metals may be used as the semi-transparent electrode 113. For example, an alloy containing magnesium or silver as a main component may be used for the semi-transparent electrode 113. For example, the semi-transparent electrode 113 may have a laminated structure of layers containing the above materials as long as it has an appropriate transmittance. For example, the semi-transparent electrode 113 may be shared by a plurality of light-emitting elements 103 as shown in FIG. 2(a).

[0022] One of the reflective electrode 111 (and the transparent electrode 123) or the semi-transparent electrode 113 functions as an anode, and the other functions as a cathode. That is, the reflective electrode 111 may be the anode and the semi-transparent electrode 113 may be the cathode, or vice versa.

[0023] The organic layer 112 including the light-emitting layer is disposed on the transparent electrode 123. The organic layer 112 can be formed by a known technique such as a vapor deposition method or a spin coating method. The organic layer 112 may be composed of a plurality of layers including the light-emitting layer. The layers other than the light-emitting layer included in the organic layer 112 include a hole injection layer, a hole transport layer, an electron blocking layer, a hole blocking layer, an electron transport layer, and an electron injection layer. The light-emitting layer emits light by recombining holes injected from the anode and electrons injected from the cathode. The light-emitting layer may have a single-layer structure or a laminated structure. The light-emitting layer may have a red light-emitting material, a green light-emitting material, and a blue light-emitting material, and it is also possible to obtain white light by mixing the respective light-emitting colors. The light-emitting layer may also have light-emitting materials of complementary colors such as a blue light-emitting material and a yellow light-emitting material. The light-emitting material may be a material such as a fluorescent material, a phosphorescent material, or a delayed fluorescent material, or may be a quantum dot such as CdS or perovskite. Furthermore, the material or structure contained in the light-emitting layer may be different for each of the light-emitting elements 103 emitting different colors. In this case, an independent light-emitting layer may be provided for each of the light-emitting elements 103, and for example, the organic layer 112 is formed for each of the light-emitting elements 103 by patterning the light-emitting layer.

[0024] The protective layer 114 may be an insulating layer containing an inorganic material that is transparent and has low permeability to oxygen, moisture, and the like from the outside. For example, silicon nitride, silicon oxynitride, silicon oxide, aluminum oxide, titanium oxide, and the like may be used for the protective layer 114. In terms of protective performance, silicon nitride, silicon oxynitride, and aluminum oxide are suitable. The protective layer 114 may be formed by a chemical vapor deposition (CVD) method, an atomic layer deposition (ALD) method, a sputtering method, and the like.

[0025] The protective layer 114 may have a single layer structure or a laminate structure as long as it has sufficient moisture blocking performance. The protective layer 114 may have a laminate structure with, for example, silicon nitride using a CVD method and aluminum oxide using an ALD method. The ALD method can form a high-density layer. Furthermore, the protective layer 114 may have an organic layer as long as it maintains moisture blocking performance. Examples of the organic layer include layers using polyacrylate, polyimide, polyester, epoxy, etc. Furthermore, as shown in FIG. 2(a), the protective layer 114 may be disposed across a plurality of light-emitting elements 103. In order to flatten the unevenness of the upper surface of the protective layer 114, a planarization layer may be disposed between the protective layer 114 and the microlens 119. A color filter 120 may be disposed between the microlens 119 and the protective layer 114, or between the microlens 119 and the planarization layer.

[0026] The microlens 119 can be formed using an exposure process and a development process. Specifically, a material film (photoresist film) for forming the microlens 119 is formed, and the material film is exposed and developed using a mask having a continuous gradation change. As such a mask, a gray mask or an area gradation mask can be used. The area gradation mask enables light irradiation with continuous gradation on the imaging surface by changing the density distribution of dots using a light-shielding film that is equal to or lower than the resolution of the exposure device.

[0027] In addition, the lens shape can be adjusted by performing an etch-back process on the microlens 119 formed by the exposure process and the development process. The shape of the microlens 119 may be spherical or asymmetric in cross section as long as it can refract the emitted light. The effect of the present disclosure is not limited to the microlens 119 shown in FIGS. 2(a) and 2(b). In other words, the microlens 119 may be an aspherical microlens, a conical microlens, a cylindrical microlens, a digital microlens, or the like as long as it has a certain inclination angle with respect to the main surface 140 of the substrate 110.

[0028] Next, the effects of this embodiment will be described. First, the interference peak wavelength (resonant wavelength) is defined. It is known that the light emitting efficiency of the light emitting element 103 changes significantly depending on the optical interference conditions. Strengthening the optical interference conditions means adjusting the distance d0 from the light emitting position of the light emitting layer of the organic layer 112 to the reflecting surface of the reflecting material to d0 = mλ / 4n0 (m = 1, 3, 5...) to achieve constructive interference. As a result, the radiation distribution of light with wavelength λ has more components in a specific direction, and the radiance at a specific angle is improved. Here, n0 is the effective refractive index at wavelength λ of the layer from the light emitting position to the reflecting surface.

[0029] More specifically, the optical distance Lr that strengthens the optical interference condition from the light-emitting position to the reflective surface of the reflective electrode 111 is expressed by the following formula (1), where φr [rad] is the sum of the phase shift amounts when light of wavelength λ is reflected by the reflective surface of the reflective electrode 111, and θeml [°] is the radiation angle with respect to the normal direction of the main surface 140 of the substrate 110 in the light-emitting layer. Here, the optical distance Lr is calculated by multiplying the refractive index n j and thickness d j That is, Lr is the sum of the products of Σn j ×d j In addition, when the distance from the light emitting layer of the organic layer 112 to the reflective electrode 111 is d1 and the effective refractive index at the wavelength λ is n1, Lr can also be expressed as n1×d1, where φr is a negative value. Lr(θeml)=(2m-(φr / π))×(λ / 4)×1 / cosθeml (1)

[0030] In formula (1), m is the order of interference between the light-emitting point and the reflective electrode 111, and is an integer equal to or greater than 0. In the ideal case where φr=π, the cases of m=0 and m=1 are called the λ / 4 interference condition and the 3λ / 4 interference condition, respectively.

[0031] The same applies to the interference condition for the optical distance Ls from the light emitting layer of the organic layer 112 to the semi-transparent electrode 113. Therefore, the optical distance L that strengthens the optical interference condition from the reflective electrode 111 to the semi-transparent electrode 113 is expressed by the following formula (2). L(θeml)=(Lr+Ls)=(2M-Φ / π)×(λ / 4)×1 / cosθeml...(2) Here, M is the sum (M=m+m') of the interference order m between the light-emitting layer of the organic layer 112 and the reflective electrode 111 and the interference order m' between the light-emitting layer of the organic layer 112 and the semi-transparent electrode 113, and is an integer equal to or greater than 0. Φ is the sum of phase shifts (Φ=φr+φs) when light with wavelength λ is reflected by the reflective electrode 111 and the semi-transparent electrode 113 (φs [rad]: the sum of phase shift amounts when light with wavelength λ is reflected by the reflective surface of the semi-transparent electrode 113).

[0032] In the case of a light-emitting element that does not have an inclined surface of the light extraction structure 104 such as the microlens 119, the film thickness of each layer between the reflective electrode 111 and the semi-transparent electrode 113 is often designed so as to satisfy formulas (1) and (2) in the normal direction of the main surface 140 of the substrate 110, that is, under the condition of θeml=0°. In that case, if the resonance peak wavelength in the normal direction is λon, the following formula (3) is obtained. λon=4πL(0) / (2πM-Φ)···(3) Here, L(0) is the full layer interference length at θeml=0°. Usually, in a light-emitting device that does not have an inclined surface of the light extraction structure 104 such as the microlens 119, the resonance peak wavelength λon in the normal direction expressed by formula (3) is designed to be approximately equal to the peak wavelength λ of the emission spectrum of the light-emitting device (e.g., the light-emitting dopant of the light-emitting layer). Here, the value obtained by subtracting the peak wavelength λ of the emission spectrum from the resonance peak wavelength λon is defined as Δ (Δ=λon-λ). Therefore, in a light-emitting device that does not have the light extraction structure 104, it is often designed as Δ=λon-λ=0.

[0033] Next, a description will be given of the difference in viewing angle characteristics between the light emitting element 103 having the light extraction structure 104 such as the microlens 119 and the light emitting element not having the light extraction structure 104. FIGS. 3(a) to 3(d) are diagrams showing the relationship between the light ray angle θ outside the light emitting element 103 and the light ray angle θeml inside the light emitting element 103. FIGS. 3(a) and 3(b) are diagrams showing the relationship between the light ray angles of the light rays 130a and 130b in the light emitting element 133 of the comparative example not having the light extraction structure 104. FIGS. 3(c) and 3(d) are diagrams showing the relationship between the light ray angles of the light rays 130c and 130d in the light emitting element 103 of this embodiment having the microlens 119 as the light extraction structure 104. The cases where the light ray angle θ outside the light emitting elements 103 and 133 is 0° and 30° are shown, respectively. Here, for simplicity, the refractive index n of the organic layer 112 including the light emitting layer is used. ml , the refractive index n2 of the protective layer 114, the refractive index n1 of the color filter 120, and the refractive index n ml and are shown to be the same (n ml =n1=n2=n eml ).

[0034] When no light extraction structure is provided, as in the light-emitting element 133, there is no distribution in the light ray angles θeml in the light-emitting element 133, as shown in Figures 3(a) and 3(b). On the other hand, when a microlens 119 is provided as the light extraction structure 104, the light ray angles θeml also have a distribution in the light-emitting element 103 according to the shape parameters (tilt angle distribution) of the microlens 119, as shown in Figures 3(c) and 3(d).

[0035] 3(b), when there is no light extraction structure 104, a light ray 130b' is generated as a mixed color component that passes through the color filter of the adjacent light-emitting element 133. On the other hand, in the case of a light-emitting element 103 in which a microlens 119 is provided, as shown in FIG. 3(d), a light ray 130d' ​​that passes through the color filter 120 of the adjacent light-emitting element 103 is totally reflected by the microlens 119 and is not emitted to the outside. Due to this difference, the interference design for suppressing color shift differs depending on whether or not a light extraction structure 104 such as a microlens 119 is provided.

[0036] Next, a method for suppressing the visibility of color shift will be described. In order to suppress the visibility of color shift, it is advisable to shift the chromaticity change of white to the blue side along the blackbody locus. FIG. 4 shows a blackbody locus 141 in an a*b* space when the reference white point (origin) is D65. Here, for simplicity, the a*b* space is shown, but the u'v' space or xy space may also be used. The condition for reducing the visibility of color shift, that is, the condition for shifting the color to the blue side along the blackbody locus 141, corresponds to the visibility reduction region 142 shown in FIG. 4. Specifically, |a*| is 5 or less, and b* is 0 or less. That is, the light emitting device 100 with reduced color shift visibility has a plurality of light emitting elements 103 arranged on the main surface 140 of the substrate 110, each of which has a light emitting layer and a light extraction structure 104 arranged to cover the light emitting layer, and the plurality of light emitting elements 103 include a red light emitting element 103r that emits red light, a green light emitting element 103g that emits green light, and a blue light emitting element 103b that emits blue light, and each of the light emitting elements has a resonator structure corresponding to the respective light emission colors. In this case, it can also be said that the color shift in the a*b* space between the light emission in the normal direction of the main surface 140 of the substrate 110 and the light emission in the direction at an angle of 30° to the normal direction of the main surface 140 of the substrate 110 during white light emission by the light emitting device 100 is |a*|≦5.0, b*≦0. In order to reduce the visibility of the color shift, it is ideal to reduce the absolute value of the color shift. However, in consideration of other conditions such as light extraction efficiency, it may be difficult to reduce the absolute value of the color shift. In such a case, by shifting the color toward the blue side, which corresponds to the visibility-decreasing region 142, it is possible to reduce the visibility of the color shift.

[0037] The inventors conducted various studies and found that, by satisfying the following relational expression, the visibility of color shift can be suppressed in the light emitting element 103 having the light extraction structure 104 such as the microlens 119.

[0038] Δg = λon_g - λg>0 [nm] (4) Δb = λon_b - λb > 0 [nm] (5) Δg-Δb≧0[nm] (6) Here, λon_g [nm] is the resonance peak wavelength in the normal direction to the main surface 140 of the substrate 110 in the resonator structure of the green light emitting element 103g. λg [nm] is the peak wavelength of the emission spectrum of the green light emitting element 103g. λon_b [nm] is the resonance peak wavelength in the normal direction to the main surface 140 of the substrate 110 in the resonator structure of the blue light emitting element 103b. λb [nm] is the peak wavelength of the emission spectrum of the blue light emitting element 103b.

[0039] moreover, 15[nm]≧Δg-Δb≧0[nm]···(7) may be satisfied.

[0040] Moreover, Δb obtained by subtracting the peak wavelength λb of the emission spectrum from the resonance peak wavelength λon_b of the blue light emitting element 103b is given by 17 nm ≥ Δb > 0 nm (8) may further be satisfied.

[0041] Furthermore, Δg obtained by subtracting the peak wavelength λg of the emission spectrum from the resonance peak wavelength λon_g of the green light emitting element 103g is given by 20[nm]≧Δg≧10[nm]···(9) may further be satisfied.

[0042] By satisfying these conditions, it becomes possible to suppress the visibility of color shift. Examples and comparative examples will be described later.

[0043] 5(a) and 5(b), the relationship between the center position of the microlens 119, which is the light extraction structure 104, and the center position of the light emitting region 117 of the light emitting element 103 in the display region 101 in which a plurality of light emitting elements 103 are arranged will be described. The light emitting region 117 can be a portion of the transparent electrode 123 that is not covered by the insulating layer 116.

[0044] 5(a) and 5(b) are a plan view and a cross-sectional view showing a relationship between the microlens 119 and the light-emitting region 117 between E-E' of the display region 101, in which a microlens 119 is illustrated as an example of the light extraction structure 104. E' is the center of the display region 101. The light-emitting elements 103 arranged in the display region 101 include light-emitting elements 103_1 to 3 arranged between the center E' and the outer edge E of the display region 101. In an orthogonal projection onto the main surface 140 of the substrate 110, the center of the microlens 119 arranged on the light-emitting elements 103_1 to 3 may be arranged between the center of the light-emitting region 117 that emits light among the light-emitting elements 103_1 to 3 and the center E' of the display region 101. Also, for example, consider light-emitting elements 103_1 and 2 arranged between the center E' of the display region 101 and the light-emitting element 103_3. In an orthogonal projection onto main surface 140 of substrate 110, displacement 153 between the center of light-emitting region 117 in light-emitting element 103_3 and the center of microlens 119 may be larger than displacements 151, 152 between the centers of light-emitting region 117 in light-emitting elements 103_1, 2 and the centers of microlenses 119. Furthermore, in an orthogonal projection onto main surface 140 of substrate 110, the center of microlens 119 arranged in light-emitting element 103_0 arranged at center E' of display region 101 may overlap with the center of light-emitting region 117 of light-emitting element 103_0 that emits light.

[0045] As shown in FIG. 5, light emitting region 117 and microlens 119 may be arranged such that offset amounts 151, 152, and 153 between the center of light emitting region 117 and the center of microlens 119 increase from center E to outer edge E of display region 101. However, the present invention is not limited thereto, and offset amounts 151 to 153 between the center of light emitting region 117 and the center of microlens 119 may be constant. As described above, offset amount 150 between the center of light emitting region 117 and the center of microlens 119 of light emitting element 103_0 arranged at center E' of display region 101 may be 0. However, the present invention is not limited thereto, and the center of light emitting region 117 and the center of microlens 119 may be offset in light emitting element 103_0 arranged at center E' of display region 101. For example, offset amounts 150 to 153 between the center of light emitting region 117 and the center of microlens 119 may be constant (for example, 0).

[0046] The displacement amounts 150-153 may be formed so as to change continuously from a macroscopic perspective with respect to the positions of the light emitting elements 103 in the display region 101. The change in the displacement amounts 150-153 only needs to be continuous from a macroscopic perspective, and the displacement amounts 150-153 may be changed for each light emitting element 103, or may be changed in a step-like manner for each predetermined range. Furthermore, the displacement amounts 150-153 may be changed for each light emitting element 103 in some regions, and may be changed in a step-like manner for each predetermined range in other regions.

[0047] As described above, Δg and Δb obtained by subtracting the peak wavelengths λg and λb of the emission spectrum from the resonance peak wavelengths λon_g and λon_b of the green light emitting element 103g and the blue light emitting element 103b are set to be equal to or greater than 0 and greater than Δg. This makes it possible to reduce the visibility of color shift in white on the wide-angle side where the viewing angle is large.

[0048] Next, specific effects of this embodiment will be described using examples. In this study, the light-emitting element 103 shown in FIG. 2(a) was used. As described above, the effects of this embodiment may be achieved with a configuration in which the organic layer 112 including the light-emitting layer is patterned for each light-emitting element 103. Also, the light-emitting element 103 may have a light-emitting layer that emits light of an appropriate color and does not have a color filter 120.

[0049] Fig. 8 shows the shape parameters of the light emitting element 103 considered in this example. These are the height h / D and radius r / D of the microlens 119 normalized by the pitch D at which the light emitting elements 103 are arranged, and the height d / D between the semi-transparent electrode 113 and the color filter 120. When ray tracing (Zemax) was performed for the configuration shown in Fig. 2(a) and Fig. 8, the distribution of the radiation angle in the organic light emitting element among the light rays emitted in the normal direction (θ=0°) and θ=30° of the main surface 140 of the substrate 110 was the characteristic shown by ML1 in Figs. 6(a) and 6(b), respectively.

[0050] The results of the study are shown in Figure 9. The reflective electrode 111 was an Al electrode, the semi-transparent electrode 113 was 15 nm of MgAg, and the protective layer 114 was silicon nitride. The microlens 119 was formed using a material with a refractive index n = 1.5. The emission spectrum PL1 of the luminescent dopant used in this example is shown in Figure 7. The red, green, and blue emission spectra were R-PL1, G-PL1, and B-PL1, respectively, and the peak wavelengths were 623 nm, 523 nm, and 462 nm, respectively.

[0051] 9 shows the value of Δ obtained by subtracting the peak wavelength λ of the emission spectrum from the resonance peak wavelength λon of the resonator structure described by the above formula (3), and the value of the difference Δg-Δb between Δg of the green light emitting element 103g and Δb of the blue light emitting element 103b. The color shifts a* and b* shown in FIG. 9 are the color shifts at θ=30° with respect to the normal direction when the reference white point (D65) is displayed in the normal direction of the main surface 140 of the substrate 110.

[0052] Comparative Example 1 is a configuration that does not include a microlens 119, and although conditional expressions (4) to (9) for Δ are satisfied, the color shift is a*=-6.8, which indicates that the color shift is toward the green side. In other words, the color shift is easily visible. Comparative Examples 2 and 3 are configurations that include a microlens 119, but do not satisfy conditional expression (5) for Δb of the blue light-emitting element 103b. As can be seen from FIG. 9, a* is large at -13.8 and -12.2, and the color shift is toward the green side, regardless of the value of Δr of the red light-emitting element 103r, indicating that the color shift visibility is high.

[0053] Examples 1 and 2 are configured to include a microlens 119, and satisfy the conditional expressions (4) to (9) of Δ. The difference between Example 1 and Example 2 is that the Δb value of the blue light-emitting element 103b is 2 and 4. In both Examples 1 and 2, the a* value is small, at -2.7 and -0.8, and the b* is -5.0 and -8.9, respectively. In other words, it is found that color shift occurs toward the blue side. In this way, in the light-emitting element 103 in which the light extraction structure 104 such as the microlens 119 is disposed, the optical interference of the light-emitting element 103 is adjusted so as to satisfy the conditional expressions (4) to (9) of Δ. It was found that this makes it possible to suppress the visibility of color shift on the wide-angle side where the viewing angle is large.

[0054] Fig. 10 shows the results when the light-emitting dopant used in the blue light-emitting element 103b is changed from that in the embodiment shown in Fig. 9. Fig. 7 shows the emission spectrum B-PL2 of the light-emitting dopant used in the blue light-emitting element 103b. Other materials of the light-emitting element 103 and configurations of interference conditions are the same as those in the embodiment shown in Fig. 9. The color shifts a* and b* are the color shifts at θ=30° with respect to the normal direction when the reference white point (D65) is displayed in the normal direction of the main surface 140 of the substrate 110, as in the results shown in Fig. 9.

[0055] Comparative Examples 4 and 5 are light-emitting elements each having a microlens. Comparative Example 4 is a condition where Δ conditional formula (7) is not satisfied, and Comparative Example 5 is a value of color shift when Δ conditional formulas (7) and (9) are not satisfied. Comparative Examples 4 and 5 have a* values ​​of -14.9 and -20, respectively, and it was found that color shift occurs to the green side. In other words, the color shift visibility is high. On the other hand, Examples 3 and 4 are configurations that have a microlens and satisfy Δ conditional formulas (4) to (9). In Examples 3 and 4, the Δr values ​​of the red light-emitting element 103r are 3 and 11, respectively. In Examples 3 and 4, a* is -1.9 and -1.3, respectively, regardless of Δr of the red light-emitting element 103r, and the absolute value of a* is small. On the other hand, the b* values ​​are -9.3 and -8.9, and it was found that color shift occurs to the blue side. From the above, it has been found that the visibility of color shift can be reduced by satisfying the interference conditions (4) to (9) of the light emitting element 103, regardless of the shape of the emission spectrum of the blue light emitting element 103b.

[0056] Next, the results of the study when the shape of the microlens 119 is changed are shown. Figure 11 shows the shape parameters of the light emitting element 103 studied in this example. When ray tracing (Zemax) was performed for the configuration shown in Figures 2(a) and 11, the distribution of the radiation angles in the organic light emitting element among the light rays emitted in the normal direction (θ=0°) and θ=30° of the main surface 140 of the substrate 110 was the characteristic shown by ML2 in Figures 6(a) and 6(b), respectively.

[0057] Fig. 12 shows the results of an investigation into the use of microlens 119 shown in Fig. 11. Other than that, the material of light-emitting element 103, the configuration of interference conditions, and the like are the same as those in the embodiment shown in Figs. 9 and 10. Similar to the results shown in Figs. 9 and 10, a* and b* indicating color shift are color shifts at θ=30° with respect to the normal direction when the reference white point (D65) is displayed in the normal direction of main surface 140 of substrate 110.

[0058] Comparative Examples 6 to 8 are light-emitting elements that include microlenses 119 but do not satisfy conditional formula (5) for Δ. In Comparative Examples 6 to 8, the Δr values ​​of the red light-emitting element 103r are -38, -17, and -11, respectively. As can be seen from Fig. 12, regardless of the Δr value of the red light-emitting element 103r, the a* values ​​are large at -9.0, -8.4, and -7.8, respectively, indicating a color shift to the green side.

[0059] On the other hand, Examples 5 to 7 are cases where the microlens 119 is provided and the above-mentioned Δ conditional expressions (4) to (9) are satisfied. As can be seen from Fig. 12, in Examples 5 to 7, regardless of the Δr value of the red light emitting element 103r, the a* values ​​were -0.6, -1.2, and -0.1, respectively, and the b* values ​​were -7.3, -7.8, and -7.3, respectively. In other words, it was found that there was a color shift to the blue side, and the color shift visibility was low.

[0060] From the above, it has become clear that the visibility of color shift can be reduced by satisfying the relational expressions of the interference conditions of the light emitting elements 103, regardless of the shape of the microlenses 119. For example, in a wearable device such as a head mounted display, the center of the display area 101 is designed to mainly use light in the normal direction of the main surface 140 of the substrate 110, and the peripheral area of ​​the display area 101 is designed to mainly use light on the wide angle side because the peripheral area is relatively close to the eyes. Even in such a case, the visibility of color shift in one field of view can be suppressed by satisfying the above expressions (4) to (6) and further expressions (7) to (9) shown in this embodiment.

[0061] Here, application examples in which the light emitting device 100 of this embodiment is applied to an image forming device, a display device, a photoelectric conversion device, an electronic device, a lighting device, a mobile object, and a wearable device will be described with reference to Figs. 13(a), 13(b) to 21(a), 21(b). As described above, the light emitting device 100 will be described assuming that an organic light emitting element such as an organic EL element is arranged as the light emitting element 103 in the display region 101. First, the components arranged in the display region 101 of the light emitting device 100 will be described in detail, and then application examples will be described. In the following description, the light emitting element 103 may be referred to as a "pixel" or a "subpixel".

[0062] Structure of organic light-emitting device The organic light-emitting element is provided by forming an insulating layer, a first electrode, an organic compound layer, and a second electrode on a substrate. A protective layer, a color filter, a microlens, etc. may be provided on the cathode. When a color filter is provided, a planarizing layer may be provided between the protective layer and the color filter. The planarizing layer may be made of acrylic resin or the like. The same applies when a planarizing layer is provided between the color filter and the microlens.

[0063] substrate Examples of the substrate include quartz, glass, silicon wafer, resin, and metal. In addition, the substrate may have a switching element such as a transistor, a wiring pattern, and the like, and an insulating layer thereon. The insulating layer may be made of any material as long as it can form a contact hole so that a wiring pattern can be formed between the first electrode and the substrate, and insulation from wiring patterns that are not connected can be ensured. For example, the insulating layer may be made of a resin such as polyimide, silicon oxide, silicon nitride, and the like.

[0064] electrode A pair of electrodes can be used as the electrodes. The pair of electrodes may be an anode and a cathode. When an electric field is applied in the direction in which the organic light-emitting element emits light, the electrode with a higher potential is the anode, and the other is the cathode. It can also be said that the electrode that supplies holes to the light-emitting layer is the anode, and the electrode that supplies electrons is the cathode.

[0065] A material having a large work function may be selected as the material for the anode. For example, a metal such as gold, platinum, silver, copper, nickel, palladium, cobalt, selenium, vanadium, or tungsten, a mixture containing these metals, or an alloy of these metals, or a metal oxide such as tin oxide, zinc oxide, indium oxide, indium tin oxide (ITO), or indium zinc oxide may be used. Also, a conductive polymer such as polyaniline, polypyrrole, or polythiophene may be used as the material for the anode.

[0066] These electrode materials may be used alone or in combination of two or more. The anode may be composed of one layer or multiple layers.

[0067] When the electrode is used as a reflective electrode, for example, chromium, aluminum, silver, titanium, tungsten, molybdenum, or an alloy thereof, or a laminate of these may be used. The above materials may function as a reflective film without serving as an electrode. When a transparent electrode is used as the electrode, a transparent conductive layer of oxide such as indium tin oxide (ITO) or indium zinc oxide may be used, but is not limited to these. Photolithography technology may be used to form the electrode.

[0068] On the other hand, a material with a small work function may be selected as the material for the cathode. For example, an alkali metal such as lithium, an alkaline earth metal such as calcium, an aluminum, titanium, manganese, silver, lead, chromium, or a mixture containing these metals may be used. Alternatively, an alloy combining these metals may be used. For example, magnesium-silver, aluminum-lithium, aluminum-magnesium, silver-copper, zinc-silver, or the like may be used. Metal oxides such as indium tin oxide (ITO) may also be used. One of these electrode materials may be used alone, or two or more may be used in combination. The cathode may have a single layer structure or a multilayer structure. Silver may be used as the cathode, and a silver alloy may be used to reduce the aggregation of silver. As long as the aggregation of silver can be reduced, the ratio of the alloy is not important. For example, silver:other metal may be 1:1, 3:1, or the like.

[0069] The cathode may be a top-emission element using an oxide conductive layer such as ITO, or a bottom-emission element using a reflective electrode such as aluminum (Al), and is not particularly limited. The method for forming the cathode is not particularly limited, but when a direct current or alternating current sputtering method or the like is used, the coverage of the formed film is good and the resistance of the cathode can be reduced.

[0070] Pixel Isolation Layer The pixel separation layer may be formed of so-called silicon oxide such as silicon nitride (SiN), silicon oxynitride (SiON), or silicon oxide (SiO) formed by chemical vapor deposition (CVD). In order to increase the resistance in the in-plane direction of the organic compound layer, the thickness of the organic compound layer, particularly the hole transport layer, may be thinned on the sidewall of the pixel separation layer. Specifically, the thickness of the organic compound layer on the sidewall can be thinned by increasing the taper angle of the sidewall of the pixel separation layer or the thickness of the pixel separation layer to increase vignetting during deposition.

[0071] On the other hand, the sidewall taper angle and film thickness of the pixel separation layer can be adjusted to such an extent that no voids are formed in the protective layer formed thereon. By preventing voids from being formed in the protective layer, the occurrence of defects in the protective layer can be reduced. Since the occurrence of defects in the protective layer is reduced, deterioration in reliability such as the occurrence of dark spots and poor conduction of the second electrode can be reduced.

[0072] According to this embodiment, even if the taper angle of the sidewall of the pixel separation layer is not steep, it is possible to effectively suppress charge leakage to adjacent pixels. As a result of this study, it was found that the charge leakage can be sufficiently reduced if the taper angle is in the range of 60 degrees or more and 90 degrees or less. The thickness of the pixel separation layer may be 10 nm or more to 150 nm or less. The same effect can be obtained even if the pixel electrode is composed only of a pixel electrode without a pixel separation layer. However, in this case, the thickness of the pixel electrode is half or less than that of the organic layer, or the pixel electrode end is forward tapered to less than 60 degrees, thereby reducing short circuits in the organic light-emitting element.

[0073] In addition, even when the first electrode is a cathode and the second electrode is an anode, a wide color gamut and low-voltage operation are possible by forming an electron transport material and a charge transport layer, and also by forming an emitting layer on the charge transport layer.

[0074] organic compound layer The organic compound layer may be formed as a single layer or as multiple layers. When the organic compound layer has multiple layers, it may be called a hole injection layer, a hole transport layer, an electron blocking layer, a light emitting layer, a hole blocking layer, an electron transport layer, an electron injection layer, or the like, depending on its function. The organic compound layer is mainly composed of an organic compound, but may contain inorganic atoms or inorganic compounds. The organic compound layer may contain, for example, copper, lithium, magnesium, aluminum, iridium, platinum, molybdenum, zinc, or the like. The organic compound layer may be disposed between the first electrode and the second electrode, or may be disposed in contact with the first electrode and the second electrode.

[0075] protective layer A protective layer may be provided on the cathode. For example, by bonding glass provided with a moisture absorbent on the cathode, the intrusion of moisture and the like into the organic compound layer can be reduced, and the occurrence of display defects can be reduced. In another embodiment, a passivation layer such as silicon nitride may be provided on the cathode to reduce the intrusion of moisture and the like into the organic compound layer. For example, after forming the cathode, the cathode may be transported to another chamber without breaking the vacuum, and silicon nitride having a thickness of 2 μm may be formed by a CVD method to form a protective layer. After forming the protective layer by the CVD method, a protective layer may be provided by an atomic layer deposition (ALD) method. The material of the protective layer by the ALD method is not limited, and may be silicon nitride, silicon oxide, aluminum oxide, or the like. Silicon nitride may be further formed by a CVD method on the protective layer formed by the ALD method. The protective layer formed by the ALD method may have a smaller film thickness than the protective layer formed by the CVD method. Specifically, the film thickness of the protective layer formed by the ALD method may be 50% or less, or even 10% or less, of the film thickness of the protective layer formed by the CVD method.

[0076] Color Filters A color filter may be provided on the protective layer. For example, a color filter taking into consideration the size of the organic light-emitting element may be provided on another substrate, and the substrate on which the color filter is formed and the substrate on which the organic light-emitting element is provided may be bonded together. In addition, for example, a color filter may be patterned on the above-mentioned protective layer using a photolithography technique. The color filter may be made of a polymer.

[0077] planarization layer A planarization layer may be disposed between the color filter and the protective layer. The planarization layer is provided for the purpose of reducing unevenness of the layers below the planarization layer. It may also be called a material resin layer without limiting the purpose. The planarization layer may be composed of an organic compound, and may be a low molecular weight or a high molecular weight compound. In consideration of reducing unevenness, a high molecular weight organic compound may be used for the planarization layer.

[0078] The planarization layer may be provided above and below the color filter. In this case, the constituent materials of each planarization layer may be the same or different. Specifically, the material of the planarization layer may be polyvinylcarbazole resin, polycarbonate resin, polyester resin, ABS resin, acrylic resin, polyimide resin, phenol resin, epoxy resin, silicone resin, urea resin, etc.

[0079] Micro Lenses The organic light-emitting device may have an optical member such as a microlens on the light-emitting side. The microlens may be made of acrylic resin, epoxy resin, or the like. The microlens may be intended to increase the amount of light extracted from the organic light-emitting device and control the direction of the extracted light. The microlens may have a hemispherical shape. When the microlens has a hemispherical shape, among the tangents to the hemisphere, there is a tangent that is parallel to the insulating layer, and the tangent and the hemisphere are the vertices of the microlens. The vertex of the microlens can be determined in the same manner in any cross-sectional view. That is, among the tangents to the semicircle of the microlens in the cross-sectional view, there is a tangent that is parallel to the insulating layer, and the tangent and the semicircle are the vertices of the microlens.

[0080] It is also possible to define the midpoint of the microlens. In the cross section of the microlens, a line segment is imaginary from a point where an arc shape ends to a point where another arc shape ends, and the midpoint of the line segment can be called the midpoint of the microlens. The cross section for determining the vertex and midpoint may be a cross section perpendicular to the insulating layer.

[0081] The microlens has a first surface having a convex portion and a second surface opposite to the first surface. The second surface can be disposed closer to the functional layer (light-emitting layer) than the first surface. To adopt such a configuration, it is necessary to form the microlens on the light-emitting device. When the functional layer is an organic layer, a process that becomes high temperature may be avoided in the manufacturing process of the microlens. In addition, when adopting a configuration in which the second surface is disposed closer to the functional layer than the first surface, the glass transition temperatures of all the organic compounds that constitute the organic layer may be 100°C or higher, and it is suitable that the glass transition temperatures are, for example, 130°C or higher.

[0082] Opposing substrate A counter substrate may be disposed on the planarization layer. The counter substrate is called a counter substrate because it is disposed at a position corresponding to the aforementioned substrate. The constituent material of the counter substrate may be the same as that of the aforementioned substrate. When the aforementioned substrate is the first substrate, the counter substrate may be the second substrate.

[0083] organic layer The organic compound layers (hole injection layer, hole transport layer, electron blocking layer, light emitting layer, hole blocking layer, electron transport layer, electron injection layer, etc.) constituting the organic light emitting element according to an embodiment of the present disclosure may be formed by the method described below.

[0084] The organic compound layer constituting the organic light-emitting element according to the embodiment of the present disclosure can be formed by dry processes such as vacuum deposition, ionization deposition, sputtering, plasma, etc. Alternatively, instead of the dry process, a wet process can be used in which a layer is formed by dissolving the compound in an appropriate solvent and applying a known coating method (e.g., spin coating, dipping, casting, LB method, inkjet method, etc.).

[0085] Here, when a layer is formed by a vacuum deposition method or a solution coating method, crystallization is unlikely to occur, and the layer has excellent stability over time. When a layer is formed by a coating method, the layer can be formed by combining with an appropriate binder resin.

[0086] Examples of the binder resin include, but are not limited to, polyvinylcarbazole resin, polycarbonate resin, polyester resin, ABS resin, acrylic resin, polyimide resin, phenol resin, epoxy resin, silicone resin, and urea resin.

[0087] These binder resins may be used alone as homopolymers or copolymers, or in combination of two or more. If necessary, known additives such as plasticizers, antioxidants, and ultraviolet absorbers may be used in combination.

[0088] Pixel circuit The light emitting device may have a pixel circuit connected to the light emitting element. The pixel circuit may be an active matrix type that controls the light emission of the first light emitting element and the second light emitting element independently. The active matrix type circuit may be a voltage programming circuit or a current programming circuit. The drive circuit has a pixel circuit for each pixel. The pixel circuit may have a light emitting element, a transistor that controls the light emission luminance of the light emitting element, a transistor that controls the light emission timing, a capacitance that holds the gate voltage of the transistor that controls the light emission luminance, and a transistor for connecting to GND without going through the light emitting element.

[0089] The light-emitting device has a display region and a peripheral region disposed around the display region. The display region has a pixel circuit, and the peripheral region has a display control circuit. The mobility of a transistor constituting the pixel circuit may be smaller than the mobility of a transistor constituting the display control circuit.

[0090] The slope of the current-voltage characteristic of the transistor that constitutes the pixel circuit may be smaller than the slope of the current-voltage characteristic of the transistor that constitutes the display control circuit. The slope of the current-voltage characteristic can be measured by the so-called Vg-Ig characteristic.

[0091] The transistors that make up the pixel circuit are transistors that are connected to a light-emitting element, such as the first light-emitting element.

[0092] Pixels An organic light emitting device includes a number of pixels, each of which includes sub-pixels that emit different colors, for example, RGB colors.

[0093] A pixel has an area that emits light, also called a pixel aperture. The pixel aperture may be 15 μm or less, or 5 μm or more. More specifically, it may be 11 μm, 9.5 μm, 7.4 μm, 6.4 μm, etc.

[0094] The spacing between the subpixels may be 10 μm or less, and specifically may be 8 μm, 7.4 μm, or 6.4 μm.

[0095] The pixels may have a known arrangement in plan view. For example, they may be a stripe arrangement, a delta arrangement, a pentile arrangement, or a Bayer arrangement. The shape of the subpixels in plan view may be any known shape. For example, they may be a rectangle, a quadrangle such as a diamond, or a hexagon. Of course, if the shape is not an exact shape but is close to a rectangle, it is included in the rectangle. The shape of the subpixels and the pixel arrangement may be used in combination.

[0096] Uses of the organic light-emitting device according to the embodiment of the present disclosure The organic light-emitting device according to the embodiment of the present disclosure can be used as a component of a display device or a lighting device, and can also be used as an exposure light source for an electrophotographic image forming device, a backlight for a liquid crystal display device, or a light-emitting device having a white light source and a color filter.

[0097] The display device may be an image information processing device having an image input unit that inputs image information from an area CCD, a linear CCD, a memory card, etc., an information processing unit that processes the input information, and displays the input image on the display unit.

[0098] The display unit of the imaging device or inkjet printer may have a touch panel function. The driving method of the touch panel function may be an infrared type, a capacitance type, a resistive film type, or an electromagnetic induction type, and is not particularly limited. The display device may be used in the display unit of a multifunction printer.

[0099] Next, further explanation will be given with reference to the drawings. FIG. 13(a) is an example of a pixel (light-emitting element 103) which is a component of the display region 101 described above. The pixel has sub-pixels 810 (light-emitting element 103). The sub-pixels are divided into 810R, 810G, and 810B according to their light emission. The emitted light color may be distinguished by the wavelength emitted from the light-emitting layer, or the light emitted from the sub-pixels may be selectively transmitted or color-converted by a color filter or the like. Each sub-pixel has a reflective electrode 802 as a first electrode on an interlayer insulating layer 801, an insulating layer 803 covering the edge of the reflective electrode 802, an organic compound layer 804 covering the first electrode and the insulating layer, a transparent electrode 805 as a second electrode, a protective layer 806, and a color filter 807.

[0100] A transistor and a capacitor may be disposed below or inside the interlayer insulating layer 801. The transistor and the first electrode may be electrically connected via a contact hole (not shown) or the like.

[0101] The insulating layer 803 may be called a bank or a pixel separation film. The insulating layer 803 covers the edge of the first electrode and is disposed so as to surround the first electrode. The portion of the first electrode where the insulating layer 803 is not disposed contacts the organic compound layer 804 and becomes a light-emitting region.

[0102] The organic compound layer 804 has a hole injection layer 841 , a hole transport layer 842 , a first light emitting layer 843 , a second light emitting layer 844 , and an electron transport layer 845 .

[0103] The second electrode may be a transparent electrode, a reflective electrode, or a semi-transparent electrode.

[0104] The protective layer 806 reduces the penetration of moisture into the organic compound layer. Although the protective layer is illustrated as being a single layer, it may be a multi-layer. Each layer may be an inorganic compound layer and an organic compound layer.

[0105] The color filters 807 are divided into 807R, 807G, and 807B according to their colors. The color filters may be formed on a planarization film (not shown). A resin protective layer (not shown) may be disposed on the color filters. The color filters may be formed on a protective layer 806. The color filters may be provided on an opposing substrate such as a glass substrate and then bonded thereto.

[0106] The display device 800 (corresponding to the above-mentioned light-emitting device 100) in FIG. 13(b) shows an organic light-emitting element 826 and a TFT 818 as an example of a transistor. A substrate 811 such as glass or silicon is provided with an insulating layer 812 on the substrate. An active element such as a TFT 818 is provided on the insulating layer, and a gate electrode 813, a gate insulating film 814, and a semiconductor layer 815 of the active element are provided. The TFT 818 is also composed of a semiconductor layer 815, a drain electrode 816, and a source electrode 817. An insulating film 819 is provided on the upper part of the TFT 818. An anode 821 constituting the organic light-emitting element 826 and a source electrode 817 are connected via a contact hole 820 provided in the insulating film.

[0107] The method of electrical connection between the electrodes (anode, cathode) included in the organic light-emitting element 826 and the electrodes (source electrode, drain electrode) included in the TFT is not limited to the embodiment shown in Fig. 13(b). In other words, it is sufficient that either the anode or the cathode is electrically connected to either the TFT source electrode or the drain electrode. TFT stands for thin film transistor.

[0108] 13(b), the organic compound layer is illustrated as one layer, but the organic compound layer 822 may be a multi-layer structure. A first protective layer 824 and a second protective layer 825 are provided on the cathode 823 to reduce deterioration of the organic light-emitting element.

[0109] In the display device 800 of FIG. 13(b), transistors are used as switching elements, but other switching elements may be used instead.

[0110] The transistors used in the display device 800 of Fig. 13(b) are not limited to transistors using single crystal silicon wafers, but may be thin film transistors having an active layer on an insulating surface of a substrate. Examples of the active layer include single crystal silicon, amorphous silicon, non-single crystal silicon such as microcrystalline silicon, and non-single crystal oxide semiconductors such as indium zinc oxide and indium gallium zinc oxide. Thin film transistors are also called TFT elements.

[0111] The transistors included in the display device 800 of Fig. 13(b) may be formed in a substrate such as a silicon substrate. Here, "formed in a substrate" means that the substrate itself, such as a silicon substrate, is processed to produce the transistors. In other words, having a transistor in a substrate can be seen as the substrate and the transistor being integrally formed.

[0112] The organic light-emitting element according to this embodiment has its light emission brightness controlled by a TFT, which is an example of a switching element, and by providing the organic light-emitting element on a plurality of surfaces, an image can be displayed based on the respective light emission brightnesses. Here, the switching element according to this embodiment is not limited to a TFT, and may be a transistor formed of low-temperature polysilicon, or an active matrix driver formed on a substrate such as a silicon substrate. On a substrate may also be within the substrate. Whether to provide a transistor within the substrate or to use a TFT is selected according to the size of the display unit, and if the size is, for example, about 0.5 inches, the organic light-emitting element may be provided on a silicon substrate.

[0113] 14(a) to 14(c) are schematic diagrams showing an example of an image forming apparatus using the light emitting device 100 of this embodiment. An image forming apparatus 926 shown in Fig. 14(a) includes a photoconductor 927, an exposure light source 928, a developing section 931, a charging section 930, a transfer unit 932, a transport section 933 (the transport roller in the configuration of Fig. 14(a)), and a fixing unit 935.

[0114] Light 929 is irradiated from an exposure light source 928, and an electrostatic latent image is formed on the surface of the photoconductor 927. The light emitting device 100 can be applied to this exposure light source 928. The developing unit 931 contains toner or the like as a developer, and can function as a developing device that applies the developer to the exposed photoconductor 927. The charging unit 930 charges the photoconductor 927. The transfer unit 932 transfers the developed image to a recording medium 934. The transport unit 933 transports the recording medium 934. The recording medium 934 can be, for example, paper or film. The fixing unit 935 fixes the image formed on the recording medium.

[0115] 14(b) and 14(c) are schematic diagrams showing a state in which a plurality of light-emitting sections 936 are arranged on an elongated substrate in the longitudinal direction of an exposure light source 928. A light-emitting device 100 can be applied to this light-emitting section 936. That is, a plurality of light-emitting elements 103 arranged in a display region 101 are arranged along the longitudinal direction of the substrate. A direction 937 is parallel to the axis of the photoconductor 927. This column direction is the same as the axial direction of the photoconductor 927 when it rotates. This direction 937 can also be called the long axis direction of the photoconductor 927.

[0116] FIG. 14(b) shows a form in which the light-emitting units 936 are arranged along the long axis direction of the photoconductor 927. FIG. 14(c) shows a modified example of the arrangement of the light-emitting units 936 shown in FIG. 14(b), in which the light-emitting units 936 are arranged alternately in the column direction in the first and second columns. The light-emitting units 936 are arranged at different positions in the row direction in the first and second columns. In the first column, a plurality of light-emitting units 936 are arranged at intervals, and in the second column, the light-emitting units 936 are arranged at positions corresponding to the gaps between the light-emitting units 936 in the first column. In addition, a plurality of light-emitting units 936 are also arranged at intervals in the row direction. The arrangement of the light-emitting units 936 shown in FIG. 14(c) can be rephrased as, for example, a state in which the light-emitting units 936 are arranged in a lattice pattern, a state in which the light-emitting units 936 are arranged in a staggered pattern, or a checkerboard pattern.

[0117] FIG. 15 is a schematic diagram showing an example of a display device using the light-emitting device 100 of this embodiment. The display device 1000 may have a touch panel 1003, a display panel 1005, a frame 1006, a circuit board 1007, and a battery 1008 between an upper cover 1001 and a lower cover 1009. Flexible printed circuits FPC1002 and 1004 are connected to the touch panel 1003 and the display panel 1005. An active element such as a transistor is arranged on the circuit board 1007. The battery 1008 does not need to be arranged if the display device 1000 is not a portable device, and even if it is a portable device, it does not need to be arranged at this position. The light-emitting device 100 can be applied to the display panel 1005. The light-emitting element 103 arranged in the display area 101 of the light-emitting device 100 functioning as the display panel 1005 is connected to an active element such as a transistor arranged on the circuit board 1007 and operates.

[0118] The display device 1000 shown in Fig. 15 may be used as a display unit of a photoelectric conversion device (which may also be called an imaging device) having an optical unit with a plurality of lenses and an imaging element that receives light that has passed through the optical unit and photoelectrically converts it into an electrical signal. The photoelectric conversion device may have a display unit that displays information acquired by the imaging element. The display unit may be a display unit exposed to the outside of the photoelectric conversion device, or may be a display unit disposed within a viewfinder. The photoelectric conversion device may be a digital camera or a digital video camera.

[0119] FIG. 16 is a schematic diagram showing an example of a photoelectric conversion device using the light emitting device 100 of this embodiment. The photoelectric conversion device 1100 may have a viewfinder 1101, a rear display 1102, an operation unit 1103, and a housing 1104. The photoelectric conversion device 1100 may also be called an imaging device. The light emitting device 100 of this embodiment can be applied to the viewfinder 1101 and the rear display 1102, which are display units. In this case, the display area 101 of the light emitting device 100 may display not only an image to be captured, but also environmental information, imaging instructions, and the like. The environmental information may include the intensity of external light, the direction of external light, the moving speed of the subject, and the possibility that the subject will be blocked by an obstruction.

[0120] Since the timing suitable for capturing an image is often short, it is better to display information as soon as possible. Therefore, a light emitting device 100 in which a light emitting element 103 using an organic light emitting material such as an organic EL element is arranged in a display area 101 may be used in a viewfinder 1101 or a rear display 1102. This is because organic light emitting materials have a fast response speed. A light emitting device 100 using an organic light emitting material is more suitable than a liquid crystal display device for such devices that require a high display speed.

[0121] The photoelectric conversion device 1100 has an optical section (not shown). The optical section has a plurality of lenses, and forms an image on a photoelectric conversion element (not shown) housed in a housing 1104 that receives light that has passed through the optical section. The focal points of the plurality of lenses can be adjusted by adjusting their relative positions. This operation can also be performed automatically.

[0122] The light emitting device 100 may be applied to a display unit of an electronic device. In this case, the light emitting device 100 may have both a display function and an operation function. Examples of the portable terminal include a mobile phone such as a smartphone, a tablet, and a head mounted display.

[0123] FIG. 17 is a schematic diagram showing an example of an electronic device using the light-emitting device 100 of this embodiment. The electronic device 1200 has a display unit 1201, an operation unit 1202, and a housing 1203. The housing 1203 may have a circuit, a printed circuit board having the circuit, a battery, and a communication unit. The operation unit 1202 may be a button or a touch panel type reaction unit. The operation unit 1202 may be a biometric recognition unit that recognizes a fingerprint and performs unlocking or the like. A portable device having a communication unit can also be called a communication device. The light-emitting device 100 of this embodiment can be applied to the display unit 1201.

[0124] 18(a) and 18(b) are schematic diagrams showing an example of a display device using the light emitting device 100 of this embodiment. FIG. 18(a) shows a display device such as a television monitor or a PC monitor. The display device 1300 has a frame 1301 and a display unit 1302. The light emitting device 100 of this embodiment can be applied to the display unit 1302. The display device 1300 may have a base 1303 that supports the frame 1301 and the display unit 1302. The base 1303 is not limited to the form shown in FIG. 18(a). For example, the lower side of the frame 1301 may also serve as the base 1303. The frame 1301 and the display unit 1302 may be curved. The radius of curvature may be 5000 mm or more and 6000 mm or less.

[0125] FIG. 18(b) is a schematic diagram showing another example of a display device using the light-emitting device 100 of the present embodiment. The display device 1310 of FIG. 18(b) is configured to be bendable, and is a so-called foldable display device. The display device 1310 has a first display unit 1311, a second display unit 1312, a housing 1313, and a bending point 1314. The light-emitting device 100 of the present embodiment can be applied to the first display unit 1311 and the second display unit 1312. The first display unit 1311 and the second display unit 1312 may be a single display unit without a joint. The first display unit 1311 and the second display unit 1312 can be separated at the bending point. The first display unit 1311 and the second display unit 1312 may display different images, or the first display unit and the second display unit may display one image.

[0126] FIG. 19 is a schematic diagram showing an example of an illumination device using the light emitting device 100 of the present embodiment. The illumination device 1400 may have a housing 1401, a light source 1402, a circuit board 1403, an optical film 1404, and a light diffusion unit 1405. The light emitting device 100 of the present embodiment can be applied to the light source 1402. The optical film 1404 may be a filter that improves the color rendering of the light source. The light diffusion unit 1405 can effectively diffuse the light of the light source, such as for lighting up, and deliver the light to a wide range. If necessary, a cover may be provided on the outermost part. The illumination device 1400 may have both the optical film 1404 and the light diffusion unit 1405, or only one of them.

[0127] The lighting device 1400 is, for example, a device that illuminates a room. The lighting device 1400 may emit white light, neutral white light, or any other color from blue to red. It may have a dimming circuit that adjusts the light intensity. The lighting device 1400 may have a power supply circuit connected to the light emitting device 100 that functions as the light source 1402. The power supply circuit is a circuit that converts AC voltage to DC voltage. Moreover, white has a color temperature of 4200K, and neutral white has a color temperature of 5000K. Moreover, the lighting device 1400 may have a color filter. Moreover, the lighting device 1400 may have a heat dissipation unit. The heat dissipation unit dissipates heat inside the device to the outside of the device, and examples of the heat dissipation unit include metals with high specific heat and liquid silicon.

[0128] FIG. 20 is a schematic diagram of an automobile having a tail lamp, which is an example of a vehicle lamp using the light emitting device 100 of this embodiment. The automobile 1500 may have a tail lamp 1501, and may be configured to turn on the tail lamp 1501 when braking or the like is performed. The light emitting device 100 of this embodiment may be used as a head lamp as a vehicle lamp. An automobile is an example of a moving body, and the moving body may be a ship, a drone, an aircraft, a railroad car, an industrial robot, or the like. The moving body may have a machine body and a lamp provided thereon. The lamp may indicate the current position of the machine body.

[0129] The light emitting device 100 of this embodiment can be applied to a tail lamp 1501. The tail lamp 1501 may have a protective member that protects the light emitting device 100 functioning as the tail lamp 1501. The protective member may be made of any material as long as it has a certain degree of strength and is transparent, and may be made of polycarbonate or the like. The protective member may be made by mixing a furandicarboxylic acid derivative, an acrylonitrile derivative, or the like with polycarbonate.

[0130] The automobile 1500 may have a body 1503 and a window 1502 attached thereto. The window may be a window for checking the front and rear of the automobile, or may be a transparent display such as a head-up display. The light emitting device 100 of the present embodiment may be used in the transparent display. In this case, the constituent materials of the electrodes and the like of the light emitting device 100 are made of transparent members.

[0131] 21(a) and 21(b), a further application example of the light emitting device 100 of the present embodiment will be described. The light emitting device 100 can be applied to a system that can be worn as a wearable device, such as smart glasses, a head mounted display (HMD), or smart contacts. An image capturing and displaying device used in such an application example has an image capturing device capable of photoelectrically converting visible light, and a light emitting device capable of emitting visible light.

[0132] 21(a) illustrates glasses 1600 (smart glasses) according to one application example. An imaging device 1602 such as a CMOS sensor or a SPAD is provided on the front side of a lens 1601 of the glasses 1600. In addition, the light emitting device 100 of this embodiment is provided on the back side of the lens 1601.

[0133] The glasses 1600 further include a control device 1603. The control device 1603 functions as a power source that supplies power to the image capture device 1602 and the light emitting device 100 according to each embodiment. The control device 1603 also controls the operations of the image capture device 1602 and the light emitting device 100. The lens 1601 is formed with an optical system for focusing light on the image capture device 1602.

[0134] FIG. 21(b) illustrates glasses 1610 (smart glasses) according to one application example. The glasses 1610 have a control device 1612, and the control device 1612 is equipped with an imaging device corresponding to the imaging device 1602 and a light emitting device 100. The lens 1611 is formed with an imaging device in the control device 1612 and an optical system for projecting light emitted from the light emitting device 100, and an image is projected onto the lens 1611. The control device 1612 functions as a power source that supplies power to the imaging device and the light emitting device 100, and controls the operation of the imaging device and the light emitting device 100. The control device 1612 may have a line of sight detection unit that detects the line of sight of the wearer. Infrared light may be used to detect the line of sight. The infrared light emission unit emits infrared light toward the eyeball of a user gazing at a display image. An imaging unit having a light receiving element detects the reflected light of the emitted infrared light from the eyeball, thereby obtaining an image of the eyeball. By providing a reduction unit that reduces the amount of light from the infrared light emitting unit to the display unit in a plan view, degradation of image quality is reduced.

[0135] The gaze of the user with respect to the displayed image is detected from an image of the eyeball obtained by capturing infrared light. Any known method can be applied to gaze detection using the image of the eyeball. As an example, a gaze detection method based on a Purkinje image formed by reflection of irradiated light on the cornea can be used.

[0136] More specifically, a gaze detection process based on the pupil-corneal reflex method is performed. Using the pupil-corneal reflex method, a gaze vector that indicates the direction (rotation angle) of the eyeball is calculated based on the pupil image and the Purkinje image included in the captured image of the eyeball, thereby detecting the user's gaze.

[0137] The light emitting device 100 according to the embodiment of the present disclosure may include an imaging device having a light receiving element, and may control a display image based on user line-of-sight information from the imaging device.

[0138] Specifically, the light emitting device 100 determines a first field of view area to which the user gazes and a second field of view area other than the first field of view area based on line-of-sight information. The first field of view area and the second field of view area may be determined by a control device of the light emitting device 100, or may be received from an external control device. In the display area of ​​the light emitting device 100, the display resolution of the first field of view area may be controlled to be higher than the display resolution of the second field of view area. In other words, the resolution of the second field of view area may be lower than that of the first field of view area.

[0139] The display area includes a first display area and a second display area different from the first display area, and an area having a high priority is determined from the first display area and the second display area based on line-of-sight information. The first display area and the second display area may be determined by a control device of the light-emitting device 100, or may be determined by an external control device and received. The resolution of the area having a high priority may be controlled to be higher than the resolution of areas other than the area having a high priority. In other words, the resolution of an area having a relatively low priority may be lowered.

[0140] AI may be used to determine the first field of view area and areas with high priority. The AI ​​may be a model configured to estimate the angle of the line of sight and the distance to an object at the end of the line of sight from the image of the eyeball, using as teacher data an image of the eyeball and the direction in which the eyeball in the image was actually looking. The AI ​​program may be included in the light-emitting device 100, the imaging device, or an external device. If included in an external device, it is transmitted to the light-emitting device 100 via communication.

[0141] When display control is performed based on visual recognition detection, the present invention can be applied to smart glasses that further include an imaging device that captures images of the outside world. The smart glasses can display captured outside information in real time.

[0142] The disclosure of this specification includes the following light-emitting device, display device, photoelectric conversion device, electronic device, and wearable device.

[0143] (Item 1) a plurality of light emitting elements are disposed on a main surface of the substrate, each of the light emitting elements including a light emitting layer and a light extraction structure disposed so as to cover the light emitting layer; the plurality of light-emitting elements include a red light-emitting element that emits red light, a green light-emitting element that emits green light, and a blue light-emitting element that emits blue light, the light-emitting device having a resonator structure corresponding to each of the light-emitting colors, When a resonance peak wavelength in the normal direction of the main surface of the resonator structure of the green light-emitting element is λon_g [nm], a peak wavelength of the emission spectrum of the green light-emitting element is λg [nm], a resonance peak wavelength in the normal direction of the main surface of the resonator structure of the blue light-emitting element is λon_b [nm], and a peak wavelength of the emission spectrum of the blue light-emitting element is λb [nm], Δg=λon_g-λg>0[nm] Δb=λon_b-λb>0[nm] Δg-Δb≧0[nm] A light emitting device characterized by satisfying the above.

[0144] (Item 2) 15[nm]≧Δg-Δb≧0[nm] 2. The light emitting device according to item 1, further comprising:

[0145] (Item 3) 17[nm]≧Δb>0[nm] 3. The light emitting device according to item 1 or 2, further comprising:

[0146] (Item 4) 20[nm]≧Δg≧10[nm] 4. The light emitting device according to any one of items 1 to 3, further satisfying the following:

[0147] (Item 5) 5. The light emitting device according to any one of claims 1 to 4, wherein the light extraction structure includes a microlens.

[0148] (Item 6) a display area in which the plurality of light-emitting elements are arranged, The plurality of light emitting elements further includes a first light emitting element disposed between a center and an outer edge of the display area, 6. The light-emitting device according to item 5, characterized in that in an orthogonal projection onto the main surface, the center of the microlens arranged on the first light-emitting element is arranged between the center of the light-emitting area of ​​the first light-emitting element that emits light and the center of the display area.

[0149] (Item 7) The plurality of light emitting elements further includes a second light emitting element disposed between a center of the display area and the first light emitting element, In an orthogonal projection onto the main surface, a center of the microlens disposed on the second light-emitting element is disposed between a center of a light-emitting area that emits light in the second light-emitting element and a center of the display area; 7. The light-emitting device according to item 6, wherein, in an orthogonal projection onto the main surface, the amount of deviation between the center of the light-emitting region in the first light-emitting element and the center of the microlens is greater than the amount of deviation between the center of the light-emitting region in the second light-emitting element and the center of the microlens.

[0150] (Item 8) the plurality of light emitting elements further includes a third light emitting element disposed at a center of the display area; 8. The light emitting device according to item 6 or 7, characterized in that in an orthogonal projection onto the main surface, the center of the microlens arranged on the third light emitting element and the center of the light emitting area of ​​the third light emitting element overlap.

[0151] (Item 9) The light emitting device according to any one of items 1 to 8, characterized in that the peak wavelength of the emission spectrum of the red light emitting element is 600 nm or more and 650 nm or less, the peak wavelength of the emission spectrum of the green light emitting element is 500 nm or more and 550 nm or less, and the peak wavelength of the emission spectrum of the blue light emitting element is 440 nm or more and 480 nm or less.

[0152] (Item 10) 10. The light emitting device according to any one of items 1 to 9, wherein the light emitting layer emits white light.

[0153] (Item 11) Item 11. The light emitting device according to item 10, wherein each of the plurality of light emitting elements further comprises a color filter.

[0154] (Item 12) the color filter of the red light emitting element transmits light having a wavelength of 600 nm or more and 650 nm or less; the color filter of the green light emitting element transmits light having a wavelength of 500 nm or more and 550 nm or less; Item 12. The light emitting device according to item 11, wherein the color filter of the blue light emitting element transmits light having a wavelength of 440 nm or more and 480 nm or less.

[0155] (Item 13) a plurality of light emitting elements are disposed on a main surface of the substrate, each of the light emitting elements including a light emitting layer and a light extraction structure disposed so as to cover the light emitting layer; a light emitting device, the light emitting elements including a red light emitting element that emits red light, a green light emitting element that emits green light, and a blue light emitting element that emits blue light, the light emitting device having a resonator structure corresponding to each of the light emitting colors, The light emitting device is characterized in that, when emitting white light, the color shift in a*b* space between light emission in the normal direction to the main surface and light emission in a direction at an angle of 30° to the normal direction to the main surface is |a*|≦5.0, b*≦0.

[0156] (Item 14) Item 14. The light emitting device according to item 13, wherein the light extraction structure includes a microlens.

[0157] (Item 15) a display area in which the plurality of light-emitting elements are arranged, The plurality of light emitting elements further includes a first light emitting element disposed between a center and an outer edge of the display area, Item 15. The light-emitting device according to item 14, characterized in that in an orthogonal projection onto the main surface, the center of the microlens arranged on the first light-emitting element is arranged between the center of the light-emitting area of ​​the first light-emitting element that emits light and the center of the display area.

[0158] (Item 16) The plurality of light emitting elements further includes a second light emitting element disposed between a center of the display area and the first light emitting element, In an orthogonal projection onto the main surface, a center of the microlens disposed on the second light-emitting element is disposed between a center of a light-emitting area that emits light in the second light-emitting element and a center of the display area; Item 16. The light-emitting device according to item 15, characterized in that, in an orthogonal projection onto the main surface, the amount of deviation between the center of the light-emitting region in the first light-emitting element and the center of the microlens is greater than the amount of deviation between the center of the light-emitting region in the second light-emitting element and the center of the microlens.

[0159] (Item 17) 17. A display device comprising: a light-emitting device according to any one of items 1 to 16; and an active element connected to the light-emitting device.

[0160] (Item 18) The image sensor includes an optical unit having a plurality of microlenses, an image sensor that receives light that has passed through the optical unit, and a display unit that displays an image. 17. A photoelectric conversion device, comprising: the display section for displaying an image captured by the imaging element; and the light-emitting device according to claim 1.

[0161] (Item 19) A display device having a housing and a communication unit provided in the housing for communicating with an external device, 17. An electronic device, wherein the display unit comprises the light-emitting device according to any one of items 1 to 16.

[0162] (Item 20) A wearable device having a display device for displaying an image, A wearable device, characterized in that the display device has the light-emitting device described in any one of items 1 to 16.

[0163] The invention is not limited to the above-described embodiments, and various modifications and variations are possible without departing from the spirit and scope of the invention. Accordingly, the following claims are appended to apprise the public of the scope of the invention. [Explanation of symbols]

[0164] 100: light emitting device, 104: light extraction structure, 103: light emitting element, 110: substrate, 140: main surface

Claims

1. a plurality of light emitting elements are disposed on a main surface of the substrate, each of the light emitting elements including a light emitting layer and a light extraction structure disposed so as to cover the light emitting layer; the plurality of light-emitting elements include a red light-emitting element that emits red light, a green light-emitting element that emits green light, and a blue light-emitting element that emits blue light, the light-emitting device having a resonator structure corresponding to each of the light-emitting colors, When a resonance peak wavelength in the normal direction to the main surface of the resonator structure of the green light-emitting element is λon_g [nm], a peak wavelength of the emission spectrum of the green light-emitting element is λg [nm], a resonance peak wavelength in the normal direction to the main surface of the resonator structure of the blue light-emitting element is λon_b [nm], and a peak wavelength of the emission spectrum of the blue light-emitting element is λb [nm], Δg=λon_g−λg>0[nm] Δb=λon_b−λb>0[nm] 15[nm]≧Δg−Δb≧0[nm] A light emitting device characterized by satisfying the above.

2. 17[nm]≧Δb>0[nm] 2. The light emitting device according to claim 1, further comprising:

3. 20[nm]≧Δg≧10[nm] 2. The light emitting device according to claim 1, further comprising:

4. The light emitting device according to claim 1 , wherein the light extraction structure includes a microlens.

5. a display area in which the plurality of light-emitting elements are arranged, The plurality of light-emitting elements further includes a first light-emitting element disposed between a center and an outer edge of the display area, 5. The light-emitting device according to claim 4, characterized in that, in an orthogonal projection onto the main surface, the center of the microlens arranged on the first light-emitting element is arranged between the center of the light-emitting area of ​​the first light-emitting element that emits light and the center of the display area.

6. The plurality of light-emitting elements further includes a second light-emitting element disposed between a center of the display area and the first light-emitting element, In an orthogonal projection onto the main surface, a center of the microlens disposed on the second light-emitting element is disposed between a center of a light-emitting region of the second light-emitting element that emits light and a center of the display region; 6. The light-emitting device according to claim 5, characterized in that, in an orthogonal projection onto the main surface, the amount of deviation between the center of the light-emitting region in the first light-emitting element and the center of the microlens is greater than the amount of deviation between the center of the light-emitting region in the second light-emitting element and the center of the microlens.

7. The plurality of light-emitting elements further includes a third light-emitting element disposed at a center of the display area, 6. The light-emitting device according to claim 5, wherein in an orthogonal projection onto the main surface, the center of the microlens arranged on the third light-emitting element overlaps with the center of the light-emitting area of ​​the third light-emitting element that emits light.

8. 2. The light emitting device according to claim 1, wherein the peak wavelength of the emission spectrum of the red light emitting element is 600 nm or more and 650 nm or less, the peak wavelength of the emission spectrum of the green light emitting element is 500 nm or more and 550 nm or less, and the peak wavelength of the emission spectrum of the blue light emitting element is 440 nm or more and 480 nm or less.

9. The light emitting device according to claim 1 , wherein the light emitting layer emits white light.

10. The light emitting device according to claim 9 , wherein each of the plurality of light emitting elements further comprises a color filter.

11. the color filter included in the red light emitting element transmits light having a wavelength of 600 nm or more and 650 nm or less; the color filter included in the green light emitting element transmits light having a wavelength of 500 nm or more and 550 nm or less; 11. The light emitting device according to claim 10, wherein the color filter included in the blue light emitting element transmits light having a wavelength of 440 nm or more and 480 nm or less.

12. A plurality of light-emitting elements are arranged on a main surface of a substrate, each of the light-emitting elements having a light-emitting layer and a light extraction structure arranged to cover the light-emitting layer; the plurality of light-emitting elements include a red light-emitting element that emits red light, a green light-emitting element that emits green light, and a blue light-emitting element that emits blue light, the light-emitting device having a resonator structure corresponding to each of the light-emitting colors, When a resonance peak wavelength in the normal direction to the main surface of the resonator structure of the green light-emitting element is λon_g [nm], a peak wavelength of the emission spectrum of the green light-emitting element is λg [nm], a resonance peak wavelength in the normal direction to the main surface of the resonator structure of the blue light-emitting element is λon_b [nm], and a peak wavelength of the emission spectrum of the blue light-emitting element is λb [nm], 20[nm]≧Δg=λon_g−λg≧10[nm] Δb=λon_b−λb>0[nm] Δg−Δb≧0[nm] A light emitting device characterized by satisfying the above.

13. A display device comprising: a light-emitting device according to claim 1 ; and an active element connected to the light-emitting device.

14. The image sensor includes an optical unit having a plurality of microlenses, an image sensor that receives light that has passed through the optical unit, and a display unit that displays an image. A photoelectric conversion device, comprising: the display unit for displaying an image captured by the imaging element; and the light-emitting device according to claim 1 .

15. A display device having a housing and a communication unit provided in the housing for communicating with an external device, 13. An electronic device, comprising: a display unit comprising the light-emitting device according to claim 1.

16. A wearable device having a display device for displaying an image, A wearable device, comprising: a display device comprising the light-emitting device according to claim 1 .

Images