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

Abstract

The present disclosure provides a light emission device that has: a substrate having a main surface; first to fourth light emission elements for emitting first light or second light; and, first to fourth lenses, wherein the relationship between the size of a light emission region and the relative position of a lens is different between the first light and the second light, thereby reducing color shift due to viewing angle.

Description

[Technical Field]

[0001] The present invention relates to a light-emitting device, a display device, an imaging device, and an electronic device that have an optical member such as a microlens. [Background technology]

[0002] An organic light-emitting element is an element having a first electrode, a second electrode, and an organic compound layer disposed therebetween. It is a light-emitting device that emits light when carriers are injected from the first electrode and the second electrode. Because organic light-emitting elements are lightweight and can be made flexible, display devices equipped with organic light-emitting elements have been attracting attention in recent years. To achieve high resolution in such display devices, a method using a white-emitting organic light-emitting element and a color filter (hereinafter referred to as the "white + CF method") is known. In the white + CF method, organic layers are deposited over the entire substrate, making it relatively easy to achieve high resolution in terms of pixel size, pixel pitch, etc., compared to a method in which organic layers are deposited for each color using a metal mask.

[0003] Patent Document 1 describes the use of a display device equipped with an organic light-emitting element together with an optical system.

[0004] Fig. 14 is a diagram showing an outline of light rays from an organic light-emitting device to a user's eyeball when the organic light-emitting device is used together with an optical system. When organic light-emitting device 110 is used together with optical lens 120 as shown in Fig. 14, a central region located at the center of the display area utilizes light rays directed in a frontal direction relative to the display surface. In contrast, a peripheral region located at the periphery of the display area utilizes light directed in an oblique direction relative to the display surface, and an image is formed on eyeball 130.

[0005] That is, in the organic light-emitting element located in the peripheral region, light emitted from the organic light-emitting element at a wide angle is utilized, and therefore, improvement in the viewing angle characteristics of the organic light-emitting element is required. Patent Document 1 describes a display device in which the viewing angle characteristics are improved by displacing the center of the light-emitting surface of the light-emitting portion and the center of the color filter relatively.

[0006] Patent Document 2 describes a display device having an outcoupling component that reduces this total reflection and extracts light with a wide viewing angle. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] International Publication No. 2017 / 169563 [Patent Document 2] Japanese Patent Application Publication No. 2017-017013 Summary of the Invention [Problem to be solved by the invention]

[0008] The display devices described in Patent Documents 1 and 2 can utilize light with a wide viewing angle for display.

[0009] However, the proportion of light that contributes to display among the light emitted by organic light-emitting elements that emit light with a wide viewing angle is small, and the response to chromaticity deviation differs depending on the wavelength of the extracted light, so there was room for improvement in the position of the lens and the size of the light-emitting area. [Means for solving the problem]

[0010] The present invention has been made in view of the above-mentioned problems, and has as its object to provide a light-emitting device in which, when a lens is used, color shift due to the viewing angle is reduced and adjusted for each color.

[0011] a first lens onto which light emitted from the first light-emitting element is incident; a second lens onto which light emitted from the second light-emitting element is incident; a third lens onto which light emitted from the third light-emitting element is incident; and a fourth lens onto which light emitted from the fourth light-emitting element is incident; wherein the first light-emitting element and the second light-emitting element emit first light, and the third light-emitting element and the fourth light-emitting element emit second light having a wavelength different from that of the first light; In a cross section perpendicular to the main surface, a distance between a midpoint of the light-emitting region of the second light-emitting element and a vertex of the second lens in a direction parallel to the main surface is larger than a distance between a midpoint of the light-emitting region of the first light-emitting element and a vertex of the first lens in a direction parallel to the main surface, a distance between a midpoint of the light-emitting region of the fourth light-emitting element and a vertex of the fourth lens in a direction parallel to the main surface is larger than a distance between a midpoint of the light-emitting region of the third light-emitting element and a vertex of the third lens in a direction parallel to the main surface, and a distance between a midpoint of the light-emitting region of the second light-emitting element and a vertex of the second lens in a direction parallel to the main surface is larger than a distance between a midpoint of the light-emitting region of the first light-emitting element and a vertex of the first lens in a direction parallel to the main surface. a difference between the distance in a direction parallel to the main surface between the midpoint of the light-emitting region of the fourth light-emitting element and the vertex of the fourth lens and the distance in a direction parallel to the main surface between the midpoint of the light-emitting region of the third light-emitting element and the vertex of the third lens; a size of the light-emitting region of the second light-emitting element is less than that of the light-emitting region of the first light-emitting element; a size of the light-emitting region of the fourth light-emitting element is smaller than that of the light-emitting region of the third light-emitting element; and a difference between the sizes of the light-emitting region of the second light-emitting element and the light-emitting region of the first light-emitting element is less than that of the light-emitting region of the fourth light-emitting element. [Effects of the Invention]

[0012] According to the present invention, it is possible to provide a light emitting device in which, when a lens is used, the reduction of color shift due to the viewing angle is adjusted for each color. [Brief explanation of the drawings]

[0013] [Figure 1A] 1 is a cross-sectional view showing a first light-emitting element included in a light-emitting device according to one embodiment of the present invention. [Figure 1B] 1B is a plan view showing the first light-emitting element in FIG. 1A. FIG. [Figure 1C] 1B is a plan view showing the first light-emitting element in FIG. 1A. FIG. [Figure 2A] FIG. 3 is a cross-sectional view showing a second light-emitting element included in a light-emitting device according to one embodiment of the present invention. [Figure 2B] FIG. 2B is a plan view showing a second light-emitting element in FIG. 2A. [Figure 2C] FIG. 2B is a plan view showing a second light-emitting element in FIG. 2A. [Figure 3] FIG. 10 is a cross-sectional view of a light-emitting device according to a comparative example. [Figure 4A] 1 is a plan view of a light emitting device according to an embodiment of the present invention. [Figure 4B] FIG. 4B is a cross-sectional view taken along line AA' in FIG. 4A. [Figure 5A] 10 is a graph showing the degree of color shift and the panel position of a light emitting device according to an embodiment of the present invention. [Figure 5B] 10 is a graph showing the degree of color shift and the panel position of a light emitting device according to a comparative example. [Figure 6] 1 is a cross-sectional view of a light-emitting device according to one embodiment of the present invention. [Figure 7] 1 is a cross-sectional schematic view of a lens according to one embodiment of the present invention. [Figure 8A] 1 is a cross-sectional view showing a pixel of a light-emitting device according to one embodiment of the present invention. [Figure 8B] 1 is a cross-sectional view of a light-emitting device according to one embodiment of the present invention. [Figure 9] 1 is a schematic diagram illustrating a display device according to an embodiment of the present invention. [Figure 10A] 1 is a schematic diagram illustrating an imaging device according to an embodiment of the present invention. [Figure 10B]1 is a schematic diagram illustrating an electronic device according to an embodiment of the present invention. [Figure 11A] 1 is a schematic diagram illustrating a light-emitting device according to one embodiment of the present invention. [Figure 11B] FIG. 1 is a schematic diagram illustrating a foldable display device. [Figure 12A] 1 is a schematic diagram of an illumination device according to an embodiment of the present invention. [Figure 12B] 1 is a schematic diagram of a moving body according to an embodiment of the present invention; [Figure 13A] 1 is a schematic diagram illustrating a wearable device according to an embodiment of the present invention. [Figure 13B] 1 is a schematic diagram showing a configuration in which a wearable device according to an embodiment of the present invention has an imaging device. [Figure 14] FIG. 2 is a schematic diagram showing the positional relationship between a lens, a light emitting device, and an observer. DETAILED DESCRIPTION OF THE INVENTION

[0014] A light emitting device according to an embodiment of the present invention includes a substrate having a main surface, a first light emitting element, a second light emitting element, a third light emitting element, and a fourth light emitting element arranged on the main surface, a first lens onto which light emitted from the first light emitting element is incident, a second lens onto which light emitted from the second light emitting element is incident, a third lens onto which light emitted from the third light emitting element is incident, and a fourth lens onto which light emitted from the fourth light emitting element is incident, a first insulating layer defining a light emitting region of the first light emitting element, a second insulating layer defining a light emitting region of the second light emitting element, a third insulating layer defining a light emitting region of the third light emitting element, and a fourth insulating layer defining a light emitting region of the fourth light emitting element, wherein the first light emitting element and the second light emitting element emit first light which is fluorescence, and the third light emitting element and the fourth light emitting element emit second light which has a wavelength different from that of the first light and is phosphorescence, In a cross section perpendicular to the main surface, a distance between a midpoint of the light emitting region of the second light emitting element and a vertex of the second lens in a direction parallel to the main surface is larger than a distance between a midpoint of the light emitting region of the first light emitting element and a vertex of the first lens in a direction parallel to the main surface, a distance between a midpoint of the light emitting region of the fourth light emitting element and a vertex of the fourth lens in a direction parallel to the main surface is larger than a distance between a midpoint of the light emitting region of the third light emitting element and a vertex of the third lens in a direction parallel to the main surface, and a distance between a midpoint of the light emitting region of the second light emitting element and a vertex of the second lens in a direction parallel to the main surface is larger than a distance between a midpoint of the light emitting region of the first light emitting element and a vertex of the first lens in a direction parallel to the main surface. the difference between the distance between the midpoint of the light-emitting region of the fourth light-emitting element and the vertex of the fourth lens in the direction parallel to the main surface and the distance between the midpoint of the light-emitting region of the third light-emitting element and the vertex of the third lens in the direction parallel to the main surface is equal to or smaller than the difference between the distance between the midpoint of the light-emitting region of the fourth light-emitting element and the vertex of the third lens in the direction parallel to the main surface; the size of the light-emitting region of the second light-emitting element is equal to or smaller than the size of the light-emitting region of the first light-emitting element, the size of the light-emitting region of the fourth light-emitting element is smaller than the size of the light-emitting region of the third light-emitting element; and the difference between the size of the light-emitting region of the second light-emitting element and the light-emitting region of the first light-emitting element is equal to or smaller than the difference between the size of the light-emitting region of the fourth light-emitting element and the light-emitting region of the third light-emitting element.

[0015] The light-emitting area of ​​the second light-emitting element may be smaller than that of the first light-emitting element, and the light-emitting area of ​​the fourth light-emitting element may be smaller than that of the third light-emitting element. Also, the light-emitting area of ​​the fourth light-emitting element may be smaller than that of the second light-emitting element.

[0016] The second light-emitting element and the fourth light-emitting element may be light-emitting elements that emit light toward a wide angle of the display device, and the lenses of the second light-emitting element and the fourth light-emitting element are arranged shifted compared to the first light-emitting element in order to emit light at a wide angle.

[0017] In this case, the contribution of the second and fourth light-emitting elements to the light emission of the display device is smaller than that of the first and third light-emitting elements, because the entire light emission of the first and third light-emitting elements contributes to the light emission of the display device, whereas only a portion of the light emission of the second and fourth light-emitting elements contributes to the light emission of the display device.

[0018] In the second light-emitting element, in order to reduce the power of the non-contributing light emission, the light-emitting areas of the second light-emitting element and the fourth light-emitting element are smaller than those of the first light-emitting element and the third light-emitting element. Although the amount of light emitted by the element as a whole decreases as the light-emitting area becomes smaller, the proportion that contributes to the light emission of the display device increases. As a result, the power consumption of the display device is reduced. When the light-emitting area of ​​the fourth light-emitting element is smaller than that of the third light-emitting element, the light-emitting area of ​​the first light-emitting element and the light-emitting area of ​​the second light-emitting element may be the same size. This is because the light-emitting area of ​​the fourth light-emitting element is smaller than that of the third light-emitting element, thereby reducing power consumption.

[0019] The first light-emitting element and the second light-emitting element emit a first light, which is fluorescence. The third light-emitting element and the fourth light-emitting element emit a second light, which has a wavelength different from that of the first light. The second light is phosphorescence. Because the wavelengths are different, the difference in size of the light-emitting regions of the first and second light-emitting elements and the difference in size of the light-emitting regions of the third and fourth light-emitting elements are different. The wavelength of the first light may be shorter than the wavelength of the second light, and the first light may be blue light, and the second light may be green light.

[0020] Furthermore, the amount of light emitted from the second light-emitting element that enters the second lens may be smaller than the amount of light emitted from the first light-emitting element that enters the first lens. It can also be said that the lens efficiency of the second lens is smaller than the lens efficiency of the first lens. The lens efficiency of the first lens is the ratio of the amount of light emitted from the first light-emitting region to the amount of light that enters the first lens. The lens efficiency can be adjusted by changing the relative position between the light-emitting region and the lens. When the position of the lens is determined, the position of the light-emitting region with high lens efficiency is determined. The position with high lens efficiency can be called a sweet spot.

[0021] In this specification, the lens may be provided on the light extraction side of the light emitting device, and the convex direction of the lens may refer to the light extraction side. When the light emitting device emits light from both the lower electrode side and the upper electrode side of the light emitting element, either direction can be referred to as the light extraction side.

[0022] In this specification, the term "lens" may refer to an optical element such as a microlens. The lens shape may be spherical or aspherical. It may also be a gradient index lens, in which the refractive index varies from the center of the lens toward the outside in the radial direction, or a so-called digital microlens, in which a ring-shaped pattern of high-refractive index material and low-refractive index material is arranged coarsely and densely.

[0023] Hereinafter, embodiments will be described with reference to the drawings. Note that the following embodiments do not limit the present invention. Although multiple configurations are described in the embodiments, not all of these multiple configurations are necessarily essential to the invention, and multiple configurations may be combined arbitrarily. In the drawings, the same reference numerals are used to denote identical or similar configurations, and redundant explanations may be omitted.

[0024] [Embodiment 1] 1A to 1C are diagrams illustrating an example of a first light-emitting element and a third light-emitting element of a light-emitting device according to the present invention. Fig. 1A is a cross-sectional view of the first light-emitting element and the third light-emitting element, and Fig. 1B is a plan view of the first light-emitting element and the third light-emitting element of Fig. 1A. In this embodiment, the plan view of the first light-emitting element and the plan view of the third light-emitting element are the same except that the first light-emitting element emits a first color and the third light-emitting element emits a second color different from the first color, so the first light-emitting element and the third light-emitting element are shown in a single plan view.

[0025] The light-emitting device of FIG. 1A is composed of a substrate 100, a lower electrode 101, a functional layer 102 including a light-emitting layer, an upper electrode 103, a protective layer 104, a planarization film 105, a microlens 106, and an insulating layer 107 covering both ends of the lower electrode. The insulating layer is also called a pixel separation film or a bank. The planarization layer may be called a resin layer if it is made of resin. The cross-sectional view of FIG. 1A is a cross-section perpendicular to the main surface of the substrate. The planar view of FIG. 1B is a planar view observed from a direction perpendicular to the main surface of the substrate.

[0026] The edge of the lower electrode is in contact with and covered by an insulating layer 107. The portion of the lower electrode that is not in contact with the insulating layer may be in contact with a functional layer. The region where the lower electrode and functional layer are in contact is light-emitting region 108a, which emits light when an electric field is applied between the lower electrode and upper electrode.

[0027] The light-emitting region may be identified by observing the light emission from the same direction as in Figure 1B when an electric field is applied. Alternatively, the light-emitting region may be identified by measuring the distance from the edge of the first insulating layer covering the left edge of the lower electrode to the edge of the second insulating layer covering the right edge of the lower electrode in Figures 1A to 1C. The edge of the insulating layer may be the contact point between the insulating layer and the lower electrode.

[0028] In FIG. 1B, the light-emitting region 108a is surrounded by an insulating layer 107. In this embodiment, the light-emitting region is hexagonal, but it may be other shapes. For example, FIG. 1C shows an example of a circular light-emitting region. The light-emitting region may also be elliptical, or may be a stripe arrangement in which rectangular RGB light-emitting regions are arranged side by side to emit light.

[0029] 2A to 2C are diagrams showing a second light-emitting element that emits a first color of a light-emitting device according to the present invention. FIG. 2A is a cross-sectional view of the second light-emitting element, and FIG. 2B is a plan view of the second light-emitting element of FIG. 2A. The cross-sectional view and plan view are the same as those of FIGS. 1A to 1C. FIG. 2C shows a circular example. The fourth light-emitting element has a similar configuration.

[0030] The second light-emitting element has the same configuration as the first light-emitting element. In the direction parallel to the main surface of the substrate, the distance between the midpoint of light-emitting region 108b and the vertex of microlens 106 in the second light-emitting element is greater than the distance between the midpoint of light-emitting region 108a and the vertex of microlens 106 in the first light-emitting element. If the position of the microlens in the first light-emitting element is normal, the position of the microlens in the second light-emitting element can be said to be misaligned.

[0031] The apex of the microlens 106 is the position farthest from the principal surface of the substrate in a plane perpendicular to the principal surface of the substrate in the case of a convex lens. In the case of a concave lens, it is the position closest to the principal surface in a plane perpendicular to the principal surface of the substrate. The apex of the lens can also be said to be the center of the lens in a cross section parallel to the principal surface of the substrate.

[0032] The light-emitting region 108b of the second light-emitting element is smaller than the light-emitting region 108a of the first light-emitting element. That is, 108b in Fig. 2A is shorter as a line segment than 108a in Fig. 1A. This can also be said to mean that the area where the functional layer is in contact with the lower electrode is smaller.

[0033] In this way, the light emitting area of ​​the second light emitting element is made smaller, thereby reducing power consumption.

[0034] On the other hand, Figure 2B shows one embodiment of light-emitting region 108b. In this embodiment, 108b has two sides, left and right, on the paper, that are arranged inside a hexagon compared to 108a. That is, the light-emitting region of the second light-emitting element is hexagonal, and at least one side of the hexagon is arranged inside the hexagon compared to the light-emitting region of the first light-emitting element. The two sides of the hexagon are the pair of sides that are farthest from each other among the sides of the hexagon.

[0035] In this embodiment, two sides of the hexagon are arranged inside the hexagon relative to 108a, but it is sufficient that at least one side of the polygon is arranged inside the polygon relative to the light-emitting region 108a of the first light-emitting element.

[0036] 3 is a cross-sectional view showing a comparative embodiment. In this embodiment, the positional relationship between the light-emitting region of the second light-emitting element and the optical member is different from that of the first light-emitting element, but the light-emitting region of the second light-emitting element is the same size as that of the first light-emitting element. The positional relationship of the optical member in the second light-emitting element different from that of the first light-emitting element may be such that the optical member is misaligned. The direction in which the optical member is misaligned may be the direction in which light emitted from the light-emitting layer is desired to be bent.

[0037] 3, light from the edge of light-emitting region 108a is less likely to bend obliquely, whereas light from the center of light-emitting region 108a is more likely to bend obliquely.

[0038] Light directed toward the left side of the figure, i.e., light marked with "◯" in the figure, is light that contributes to the light emission of the display device. If the left side of the figure is the outer periphery of the display area, light directed in a direction oblique to the display surface is utilized in the outer peripheral area located on the outer periphery of the display area. Other light, i.e., light marked with "x" in the figure, is light that does not contribute to the light emission of the display device. Therefore, by emitting light only in the area where light can be bent in an oblique direction, as in the embodiments of FIGS. 1A to 1C and 2A to 2C described in embodiment 1, light utilization efficiency can be improved, and a light-emitting device with low power consumption can be provided.

[0039] In addition, display devices that utilize light directed obliquely toward the display surface in the peripheral region of the display device often have a display unit and an optical system through which the user views the display unit. In such display device configurations, not emitting unused light has the following additional effects. For example, if unused light enters the optical lens 120 in FIG. 14, it may become stray light and degrade the display quality. In the above embodiment, not emitting light that does not contribute to the display also has the effect of reducing stray light. Furthermore, since this effect differs between the first light and the second light, the change in the size of the light-emitting area of ​​the light-emitting element emitting the first light and the light-emitting element emitting the second light is different.

[0040] In this way, the light-emitting region that makes a small contribution to the light emission of the display device can be made smaller, like the second light-emitting element.

[0041] According to this embodiment, the light emission of the second light emitting element and the light emission of the fourth light emitting element efficiently contribute to the light emission of the display device, thereby reducing power consumption.

[0042] In this embodiment, the light-emitting area of ​​the fourth light-emitting element is smaller than the light-emitting area of ​​the second light-emitting element so that the difference between the viewing angle dependence of the luminance of the first color and the viewing angle dependence of the luminance of the second color different from the first color is small.

[0043] In this way, the difference in the intensity of light emitted from the fourth light-emitting element toward a wide angle relative to the intensity of light emitted from the third light-emitting element toward the front of the display device, and the difference in the intensity of light emitted from the second light-emitting element toward a wide angle relative to the intensity of light emitted from the first light-emitting element toward the front of the display device, are reduced, thereby providing a light-emitting device with reduced power consumption and reduced color shift due to viewing angle.

[0044] [Embodiment 2] 4A and 4B are diagrams showing an example of a light-emitting device according to one embodiment of the present invention. Fig. 4A is a plan view of the light-emitting device, as in Fig. 1B, seen from a direction perpendicular to the main surface of the substrate. Display region 200 has a plurality of light-emitting elements. The positional relationship between the light-emitting region and the microlenses will be explained using central portion A' and peripheral portion A.

[0045] FIG. 4B is a partial cross-sectional view taken along a line A-A' in FIG. 4A. A portion of the light-emitting element is omitted in the cross section. The positional relationship between the microlens 106, the light-emitting region 108 emitting the first color, and the light-emitting region 109 emitting the second color changes from A' to A. Specifically, based on the positional relationship between light-emitting region 108a and the microlens 106 directly above it, the positional relationship between light-emitting region 108b and the microlens directly above it is such that the microlenses are relatively shifted to the left in the figure by a microlens shift amount of 300a. Furthermore, light-emitting region 108b is smaller than light-emitting region 108a. Similarly, light-emitting region 108c is smaller than light-emitting region 108b, and the microlens directly above light-emitting region 108c is relatively shifted by 300b. Furthermore, light emitting area 108d is smaller than light emitting area 108c, and the microlens directly above light emitting area 108d is relatively shifted by 300c. Similarly, light emitting elements 109a to 109d are shown in order of decreasing light emitting area.

[0046] The light-emitting element disposed between 108a and 108b may be the same size as 108a, the same size as 108b, smaller than 108a, or larger than 108b. The light-emitting elements disposed between 108a and 108b may have light-emitting areas that become larger as they approach 108a and smaller as they approach 108b. The same applies to 109, which includes a third light-emitting element and a fourth light-emitting element that emit a second color.

[0047] The offset of the microlenses may be increased continuously or stepwise from the center A' of the display area toward the outer periphery A. By continuously or stepwisely reducing the light-emitting area in this manner, it is possible to reduce light in the display area that does not contribute to the light emission of the display device. Furthermore, by making the light-emitting area 109 of the light-emitting element that emits the second color smaller than the light-emitting area 108 of the light-emitting element that emits the first color, it is possible to reduce the difference in the viewing angle characteristics of luminance for each color.

[0048] 4A, the light emitting element closer to A than to A' is the outer element. Also, the light emitting element farther from A' can be said to be the outer light emitting element.

[0049] That is, the light-emitting device according to this embodiment may be a light-emitting device in which the offset between the microlens and the light-emitting region increases continuously. Specifically, the light-emitting device according to this embodiment includes a substrate having a main surface, first, second, third, and fourth light-emitting elements, a first lens onto which light emitted from the first light-emitting element is incident, a second lens onto which light emitted from the second light-emitting element is incident, a third lens onto which light emitted from the third light-emitting element is incident, and a fourth lens onto which light emitted from the fourth light-emitting element is incident. In a cross section perpendicular to the main surface, the distance between the midpoint of the light-emitting region of the second light-emitting element and the apex of the second lens in a direction parallel to the main surface is greater than the distance between the midpoint of the light-emitting region of the first light-emitting element and the apex of the first lens in a direction parallel to the main surface, and the distance between the midpoint of the light-emitting region of the fourth light-emitting element and the apex of the fourth lens in a direction parallel to the main surface is greater than the distance between the midpoint of the light-emitting region of the third light-emitting element and the apex of the third lens in a direction parallel to the main surface. On the other hand, the difference between the distance between the midpoint of the light-emitting region of the second light-emitting element and the vertex of the second lens in a direction parallel to the main surface and the distance between the midpoint of the light-emitting region of the first light-emitting element and the vertex of the first lens in a direction parallel to the main surface is equal to or less than the difference between the distance between the midpoint of the light-emitting region of the fourth light-emitting element and the vertex of the fourth lens in a direction parallel to the main surface and the distance between the midpoint of the light-emitting region of the third light-emitting element and the vertex of the third lens in a direction parallel to the main surface. Furthermore, the light-emitting region of the second light-emitting element is smaller than that of the first light-emitting element, the light-emitting region of the fourth light-emitting element is smaller than that of the third light-emitting element, and the light-emitting region of the fourth light-emitting element is smaller than that of the second light-emitting element. The first and second light-emitting elements emit first light, and the third and fourth light-emitting elements emit second light having a wavelength different from that of the first light. It can be said that the second light has a color different from that of the first light.

[0050] Furthermore, the difference between the distance between the midpoint of the light-emitting region of the second light-emitting element and the vertex of the second lens in a direction parallel to the main surface and the distance between the midpoint of the light-emitting region of the first light-emitting element and the vertex of the first lens in a direction parallel to the main surface may be equal to the difference between the distance between the midpoint of the light-emitting region of the fourth light-emitting element and the vertex of the fourth lens in a direction parallel to the main surface and the distance between the midpoint of the light-emitting region of the third light-emitting element and the vertex of the third lens in a direction parallel to the main surface.

[0051] In this embodiment, the light-emitting element disposed between light-emitting elements 108a and 108b can also be referred to as a fifth light-emitting element. That is, the light-emitting device further includes a fifth light-emitting element disposed between the first light-emitting element and the second light-emitting element and adjacent to the second light-emitting element, and a fifth lens onto which light emitted from the fifth light-emitting element is incident. In a cross section perpendicular to the main surface, the light-emitting device according to this embodiment can be said to have the same distance in a direction parallel to the main surface between the midpoint of the light-emitting region of the fifth light-emitting element and the vertex of the fifth lens as the distance in a direction parallel to the main surface between the midpoint of the light-emitting region of the second light-emitting element and the vertex of the second lens.

[0052] In this case, the difference between the size of the light-emitting region of the fifth light-emitting element and the size of the light-emitting region of the second light-emitting element may be smaller than the difference between the size of the light-emitting region of the second light-emitting element and the size of the first light-emitting region, and more specifically, the size of the light-emitting region of the fifth light-emitting element may be the same as the size of the light-emitting region of the second light-emitting element.

[0053] A light-emitting element disposed further outward from the substrate than 108b, specifically, a light-emitting element disposed between 108b and 108c, can be referred to as a sixth light-emitting element. That is, the light-emitting device has a sixth light-emitting element adjacent to the second light-emitting element and a sixth lens onto which light emitted from the sixth light-emitting element is incident, and the second light-emitting element is disposed between the first light-emitting element and the sixth light-emitting element. In a cross section perpendicular to the main surface, the distance between the midpoint of the light-emitting region of the sixth light-emitting element and the apex of the sixth lens in a direction parallel to the main surface may be greater than the distance between the midpoint of the light-emitting region of the second light-emitting element and the apex of the second lens in a direction parallel to the main surface.

[0054] In this case, the light-emitting area of ​​the sixth light-emitting element may be smaller than the light-emitting area of ​​the second light-emitting element.

[0055] As in the light-emitting element that emits the first light, a seventh light-emitting element and an eighth light-emitting element can also be provided in the light-emitting element that emits the second light. That is, the light-emitting device may have a seventh light-emitting element disposed between the third light-emitting element and the fourth light-emitting element and adjacent to the fourth light-emitting element, and a seventh lens onto which light emitted from the seventh light-emitting element is incident. In the light-emitting device according to this embodiment, in a cross section perpendicular to the main surface, the distance between the midpoint of the light-emitting region of the seventh light-emitting element and the vertex of the seventh lens in a direction parallel to the main surface may be equal to the distance between the midpoint of the light-emitting region of the fourth light-emitting element and the vertex of the seventh lens in a direction parallel to the main surface.

[0056] In this case, the difference between the size of the light-emitting region of the seventh light-emitting element and the size of the light-emitting region of the fourth light-emitting element may be smaller than the difference between the size of the light-emitting region of the fourth light-emitting element and the size of the third light-emitting region.

[0057] On the other hand, the light emitting device according to this embodiment has an eighth light emitting element adjacent to the fourth light emitting element and an eighth lens onto which light emitted from the eighth light emitting element is incident, and the fourth light emitting element is disposed between the third light emitting element and the eighth light emitting element. In the light emitting device according to this embodiment, in a cross section perpendicular to the main surface, the distance between the midpoint of the light emitting region of the eighth light emitting element and the apex of the eighth lens in a direction parallel to the main surface may be greater than the distance between the midpoint of the light emitting region of the fourth light emitting element and the apex of the fourth lens in a direction parallel to the main surface.

[0058] In this case, the light emitting area of ​​the eighth light emitting element may be smaller than the light emitting area of ​​the fourth light emitting element.

[0059] On the other hand, the light-emitting device according to this embodiment may have a configuration in which the offset between the microlenses increases continuously. That is, the light-emitting device according to this embodiment may have a fifth light-emitting element disposed between the first light-emitting element and the second light-emitting element and adjacent to the second light-emitting element, and a fifth lens onto which light emitted from the fifth light-emitting element is incident. In a cross section perpendicular to the main surface, the distance between the midpoint of the light-emitting region of the fifth light-emitting element and the vertex of the fifth lens in a direction parallel to the main surface may be smaller than the distance between the midpoint of the light-emitting region of the second light-emitting element and the vertex of the second lens in a direction parallel to the main surface. Furthermore, in a cross section perpendicular to the main surface, the distance between the midpoint of the light-emitting region of the fifth light-emitting element and the vertex of the fifth lens in a direction parallel to the main surface may be greater than the distance between the midpoint of the light-emitting region of the first light-emitting element and the vertex of the first lens in a direction parallel to the main surface.

[0060] In this case, the light emitting area of ​​the fifth light emitting element is larger than the light emitting area of ​​the second light emitting element and smaller than the light emitting area of ​​the first light emitting element.

[0061] On the other hand, the light emitting device according to this embodiment has a sixth light emitting element adjacent to the second light emitting element, a sixth lens onto which light emitted from the sixth light emitting element is incident, and the second light emitting element is disposed between the first light emitting element and the sixth light emitting element. In the light emitting device according to this embodiment, in a cross section perpendicular to the main surface, the distance between the midpoint of the light emitting region of the sixth light emitting element and the apex of the sixth lens in a direction parallel to the main surface may be greater than the distance between the midpoint of the light emitting region of the second light emitting element and the apex of the second lens in a direction parallel to the main surface.

[0062] In this case, the light emitting area of ​​the sixth light emitting element is smaller than the light emitting area of ​​the second light emitting element.

[0063] The light-emitting element that emits the second light includes a seventh light-emitting element disposed between the third and fourth light-emitting elements and adjacent to the fourth light-emitting element, and a seventh lens onto which light emitted from the seventh light-emitting element is incident. In a cross section perpendicular to the main surface, the distance between the midpoint of the light-emitting region of the seventh light-emitting element and the vertex of the seventh lens in a direction parallel to the main surface is smaller than the distance between the midpoint of the light-emitting region of the fourth light-emitting element and the vertex of the fourth lens in a direction parallel to the main surface. In a cross section perpendicular to the main surface, the distance between the midpoint of the light-emitting region of the seventh light-emitting element and the vertex of the seventh lens in a direction parallel to the main surface is larger than the distance between the midpoint of the light-emitting region of the third light-emitting element and the vertex of the third lens in a direction parallel to the main surface.

[0064] In this case, the light emitting area of ​​the seventh light emitting element is smaller than the light emitting area of ​​the third light emitting element and larger than the light emitting area of ​​the fourth light emitting element.

[0065] [Color misregistration reduction effect according to this embodiment] 5A and 5B are graphs in which tristimulus values ​​are normalized according to the position of the display area within the light-emitting device. The vertical axis represents the tristimulus values, and the horizontal axis represents the panel position. FIG. 5A is a graph in which the tristimulus values ​​are normalized when the light-emitting area 109 of the light-emitting element emitting the second color is smaller than the light-emitting area 108 of the light-emitting element emitting the first color. The difference in tristimulus values ​​is also reduced at the outer periphery of the display area, the right edge of the panel, and the left edge of the panel. In other words, color shift is reduced. Because the light-emitting area 109 of the light-emitting element emitting the second color is smaller than the light-emitting area 108 of the light-emitting element emitting the first color, the difference in viewing angle characteristics between colors is reduced, and the difference in luminance between colors within the display surface is reduced.

[0066] On the other hand, Figure 5B is a graph showing normalized tristimulus values ​​when the light-emitting area 109 of the light-emitting element emitting the second color and the light-emitting area 108 of the light-emitting element emitting the first color are the same size. There are differences in the tristimulus values ​​at the periphery of the display area and at the right and left edges of the panel. In other words, color shift cannot be reduced. The central area located at the center of the display area uses light rays that are directed directly toward the display surface. In contrast, the peripheral area located on the periphery of the display area uses light that is directed obliquely toward the display surface. Due to differences in the viewing angle characteristics of each color, the luminance of each color varies across the display surface.

[0067] [Embodiment 3] FIG. 6 is a cross-sectional view of a light-emitting device according to one embodiment of the present invention. In addition to the components of embodiment 1, color filters 110a to 110c are disposed on the planarization layer 105. A pixel including each of the color filters 110a to 110c is considered a sub-pixel, and three sub-pixels can be considered as one main pixel. The sub-pixels are not limited to RGB; for example, white light-emitting elements and yellow light-emitting elements may be provided. In the case of a white light-emitting element, a transparent filter may be used as the color filter, or no filter may be provided. Three colors, red, green, and blue, are particularly preferred for the sub-pixels, and additive color mixing of these sub-pixels enables full-color display.

[0068] The planar arrangement of the sub-pixels may be any of a stripe arrangement, a square arrangement, a delta arrangement, and a Bayer arrangement. Furthermore, by arranging the main pixels in a matrix, a display device with a large number of pixels can be realized.

[0069] The color filters 110a to 110c are also arranged offset from the center of the light-emitting region 108b, similar to the microlens 106. In this case, the color filter 110b may be located on the line connecting the vertex B of the microlens 106 and the end B' of the light-emitting region on the first light-emitting element side.

[0070] Furthermore, color filter 110b is located on the line connecting edge C of the microlens and edge C' of the light-emitting region. At least two types of color filters may be located on the line connecting the vertex of the microlens directly above light-emitting region 108b and the light-emitting region adjacent to light-emitting region 108b. This is to reduce light emitted from the adjacent light-emitting region from being unintentionally emitted from the microlens.

[0071] Light emitted from light-emitting region 108b passes through color filter 110b and can be bent obliquely by microlens 106, and does not pass through color filters 110a and 110c of other sub-pixels, thereby increasing color purity.

[0072] [Microlens Design According to This Embodiment] FIG. 7 is a cross-sectional view showing the relationship between the light emitting region 108 of the light emitting element emitting the first color, the light emitting element 109 of the light emitting element emitting the second color, and the microlens 106. As shown in FIG.

[0073] In FIG. 7, a microlens 106 having a height h, a radius r, and a refractive index n is formed.

[0074] Light is emitted from light-emitting region 108 of the light-emitting element that emits a first color at an angle θ1, and is bent at an angle θ2 by point A of microlens 106. The inclination of point A with respect to the tangent of the microlens at this time is defined as angle α. According to Snell's law, the following equation (1) holds. Note that in some parts of the figure, α + θ1 is written as β. 1×sin(θ2+α)=n×sin(α+θ1)···(1)

[0075] When equation (1) is solved for θ1, θ1 becomes equation (2). θ1=sin -1 {sin(θ2+α) / n}-α (2)

[0076] If the amount of deviation between the vertex of microlens 106 and the center of light emitting area 108 is Xshift and the distance from light emitting area 108 to microlens 106 is L, the size of light emitting area X is expressed by the following equation (3). X = rh × tan(θ1) (3)

[0077] From equations (2) and (3), the size X of the light emitting region 108 is expressed by equation (4). X=rh×tan[sin -1 {sin(θ2+α) / n}-α] (4)

[0078] In this case, the relationship between the angle of light emitted from light emitting region 108, θ1, and the amount of deviation Xshift from the vertex of microlens 106 to the center of light emitting region 108 is expressed by equation (5). tan ―1 (Xshift / h+L)>θ1 (5)

[0079] Calculations using wave optics simulations revealed that the offset between the vertex of microlens 106 and the center of light-emitting region 108 of the light-emitting element emitting the first color, and the aperture ratio of the light-emitting region, were as shown in Table 1. By setting the offset between the vertex of microlens 106 and the center of light-emitting region 109 of the light-emitting element emitting the second color and the aperture ratio of the light-emitting region to values ​​smaller than those shown in Table 1, color shift due to viewing angle can be reduced.

[0080] However, in reality, there are other members such as the protective film 104 and the color filter 109 between the microlens 106 and the light-emitting region 108, which may cause errors.

[0081] [Table 1]

[0082] In the light-emitting device according to this embodiment, the smaller the distance between the vertex of the microlens and the center of the light-emitting region, the larger the aperture ratio. The smaller the distance between the vertex of the microlens and the center of the light-emitting region, the smaller the lens efficiency, and the larger the distance between the vertex of the microlens and the center of the light-emitting region, the larger the lens efficiency. Lens efficiency is the ratio of the brightness without a lens to the brightness with a lens at a given angle. If the sweet spot does not increase as the size of the light-emitting region increases, the area that does not contribute to light emission increases, and the lens efficiency decreases. For wide-angle light, if the distance between the vertex of the lens and the midpoint of the light-emitting region increases and the sweet spot is removed, the lens efficiency decreases. Lens efficiency can be estimated at a 45-degree angle relative to the optical axis of the lens.

[0083] That is, the light emitting device according to this embodiment includes a substrate having a main surface, a first light emitting element, a second light emitting element, a third light emitting element, and a fourth light emitting element arranged on the main surface, a first lens onto which light emitted from the first light emitting element is incident, a second lens onto which light emitted from the second light emitting element is incident, a third lens onto which light emitted from the third light emitting element is incident, and a fourth lens onto which light emitted from the fourth light emitting element is incident, wherein the first light emitting element and the second light emitting element emit first light, and the third light emitting element and the fourth light emitting element emit second light having a wavelength different from that of the first light, and in a cross section perpendicular to the main surface, a distance between a midpoint of a light emitting region of the second light emitting element and a vertex of the second lens in a direction parallel to the main surface is larger than a distance between a midpoint of a light emitting region of the first light emitting element and a vertex of the first lens in a direction parallel to the main surface, and The distance between the midpoint of the light-emitting region of the second light-emitting element and the vertex of the third lens in a direction parallel to the main surface is greater than the distance between the midpoint of the light-emitting region of the third light-emitting element and the vertex of the third lens in a direction parallel to the main surface, and the difference between the distance between the midpoint of the light-emitting region of the second light-emitting element and the vertex of the second lens in a direction parallel to the main surface and the distance between the midpoint of the light-emitting region of the first light-emitting element and the vertex of the first lens in a direction parallel to the main surface is equal to or less than the difference between the distance between the midpoint of the light-emitting region of the fourth light-emitting element and the vertex of the fourth lens in a direction parallel to the main surface and the distance between the midpoint of the light-emitting region of the third light-emitting element and the vertex of the third lens in a direction parallel to the main surface. It can be said that the first lens has lower lens efficiency than the second lens, the third lens has lower lens efficiency than the fourth lens, and the fourth lens has lower lens efficiency than the second lens. The first light may have a shorter wavelength than the second light. That is, if the first light is blue, the second light may be green or red.

[0084] [Other Configurations in the Embodiment] [Configuration of organic light-emitting element] 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. 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.

[0085] [substrate] Examples of the substrate include quartz, glass, a silicon wafer, a resin, and a metal. Furthermore, the substrate may be provided with a switching element such as a transistor and wiring, and an insulating layer thereon. Any material can be used for the insulating layer, as long as it allows for the formation of a contact hole so that wiring can be formed between the first electrode and the insulating layer, and ensures insulation from wiring that is not connected. For example, resins such as polyimide, silicon oxide, silicon nitride, etc. can be used.

[0086] [electrode] A pair of electrodes can be used. 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.

[0087] The anode material should have as high a work function as possible. Examples include simple metals such as gold, platinum, silver, copper, nickel, palladium, cobalt, selenium, vanadium, and tungsten, mixtures containing these metals, alloys of these metals, and metal oxides such as tin oxide, zinc oxide, indium oxide, indium tin oxide (ITO), and zinc indium oxide. Conductive polymers such as polyaniline, polypyrrole, and polythiophene can also be used.

[0088] 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.

[0089] When used as a reflective electrode, for example, chromium, aluminum, silver, titanium, tungsten, molybdenum, or alloys or laminates thereof can be used. The above materials can also function as a reflective film without functioning as an electrode. When used as a transparent electrode, transparent conductive oxide layers such as indium tin oxide (ITO) and indium zinc oxide can be used, but are not limited to these. Photolithography techniques can be used to form the electrode.

[0090] On the other hand, materials with a low work function are preferred for the cathode. Examples include alkali metals such as lithium, alkaline earth metals such as calcium, and metals such as aluminum, titanium, manganese, silver, lead, and chromium, as well as mixtures containing these metals. Alternatively, alloys combining these metals can be used. For example, magnesium-silver, aluminum-lithium, aluminum-magnesium, silver-copper, and zinc-silver can be used. Metal oxides such as indium tin oxide (ITO) can also be used. These electrode materials can be used alone or in combination. The cathode can have either a single-layer or multi-layer structure. Among these, silver is preferred, and a silver alloy is even more preferred to reduce silver aggregation. The alloy ratio is not critical as long as silver aggregation can be reduced. For example, the silver:other metal ratio can be 1:1, 3:1, or the like.

[0091] 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 DC and AC sputtering methods are more preferred because they provide good film coverage and make it easier to reduce resistance.

[0092] [Organic compound layer] The organic compound layer may be formed as a single layer or as multiple layers. When multiple layers are included, they may be called hole injection layer, hole transport layer, electron blocking layer, light-emitting layer, hole blocking layer, electron transport layer, or electron injection layer depending on their functions. The organic compound layer is mainly composed of organic compounds but may also contain inorganic atoms or inorganic compounds. For example, the organic compound layer may contain 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.

[0093] [Protective layer] A protective layer may be provided on the cathode. For example, by adhering glass with a moisture absorbent on the cathode, the intrusion of water and other contaminants into the organic compound layer can be reduced, thereby reducing the occurrence of display defects. In another embodiment, a passivation film such as silicon nitride may be provided on the cathode to reduce the intrusion of water and other contaminants into the organic compound layer. For example, after forming the cathode, the cathode may be transferred to another chamber without breaking the vacuum, and a 2 μm-thick silicon nitride film may be formed by CVD to serve as a protective layer. A protective layer may be provided using atomic layer deposition (ALD) after the CVD film formation. The material of the film formed by ALD is not limited, and may be silicon nitride, silicon oxide, aluminum oxide, or the like. Silicon nitride may be further formed on the film formed by ALD by CVD. The film formed by ALD may have a thickness smaller than that of the film formed by CVD. Specifically, the thickness may be 50% or less, or even 10% or less.

[0094] [Color Filter] 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 a separate substrate and then bonded to the substrate on which the organic light-emitting element is provided, or a color filter may be patterned on the protective layer described above using photolithography technology. The color filter may be made of a polymer.

[0095] [Planarization layer] A planarization layer may be provided between the color filter and the protective layer. The planarization layer is provided for the purpose of reducing the unevenness of the underlying layer. It may also be called a material resin layer without limiting its purpose. The planarization layer may be composed of an organic compound, and may be either a low molecular weight or a high molecular weight, but a high molecular weight is preferred.

[0096] The planarizing layer may be provided above or below the color filter, and may be made of the same or different materials, such as polyvinyl carbazole resin, polycarbonate resin, polyester resin, ABS resin, acrylic resin, polyimide resin, phenol resin, epoxy resin, silicone resin, and urea resin.

[0097] [Microlens] The light-emitting device may have an optical component such as a microlens on its light-emitting side. The microlens may be made of acrylic resin, epoxy resin, or the like. The microlens may be used to increase the amount of light extracted from the light-emitting device and to 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 point of contact between this tangent and the hemisphere is the vertex of the microlens. The vertex of the microlens can be determined in the same way in any cross-sectional view. In other words, 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 point of contact between this tangent and the semicircle is the vertex of the microlens.

[0098] It is also possible to define the midpoint of a microlens. In the cross section of the microlens, a line segment is imagined from the point where an arc shape ends to the point where another arc shape ends, and the midpoint of this 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.

[0099] [Counter substrate] An opposing substrate may be provided on the planarization layer. The opposing substrate is called an opposing substrate because it is provided at a position corresponding to the aforementioned substrate. The constituent material of the opposing substrate may be the same as that of the aforementioned substrate. When the aforementioned substrate is defined as a first substrate, the opposing substrate may be a second substrate.

[0100] [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 device according to one embodiment of the present invention are formed by the method shown below.

[0101] The organic compound layer constituting the organic light-emitting device according to one embodiment of the present invention can be formed by dry processes such as vacuum deposition, ionization deposition, sputtering, plasma, etc. Alternatively to the dry process, a wet process can be used in which the compound is dissolved in an appropriate solvent and a layer is formed by a known coating method (for example, spin coating, dipping, casting, LB method, inkjet method, etc.).

[0102] 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 film is formed by a coating method, the film can be formed by combining with an appropriate binder resin.

[0103] 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.

[0104] These binder resins may be used singly or in combination as homopolymers or copolymers, and may further contain known additives such as plasticizers, antioxidants, and ultraviolet absorbers, if necessary.

[0105] [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 emission of the first light-emitting element and the second light-emitting element independently. The active matrix type circuit may be voltage-programmed or current-programmed. The drive circuit has a pixel circuit for each pixel. The pixel circuit may have a light-emitting element, a transistor that controls the emission brightness of the light-emitting element, a transistor that controls the emission timing, a capacitor that holds the gate voltage of the transistor that controls the emission brightness, and a transistor for connecting to GND without going through the light-emitting element.

[0106] The light-emitting device has a display region and a peripheral region arranged around the display region. The display region has pixel circuits, and the peripheral region has a display control circuit. The mobility of a transistor constituting the pixel circuit may be lower than the mobility of a transistor constituting the display control circuit.

[0107] The slope of the current-voltage characteristics of the transistors that make up the pixel circuit may be smaller than the slope of the current-voltage characteristics of the transistors that make up the display control circuit. The slope of the current-voltage characteristics can be measured using the so-called Vg-Ig characteristics.

[0108] The transistors that make up the pixel circuit are transistors connected to light-emitting elements such as the first light-emitting element.

[0109] The magnitude of the drive current may be determined according to the size of the light-emitting area. Specifically, when the first light-emitting element and the second light-emitting element are caused to emit light with the same luminance, the current value passed through the first light-emitting element may be smaller than the current value passed through the second light-emitting element. This is because the required current may be small due to the small light-emitting area.

[0110] [Pixels] The light emitting device has a plurality of pixels, each of which has sub-pixels that emit different colors, and each of which may emit, for example, RGB colors.

[0111] The pixel emits light from an area called the pixel aperture. This area is the same as the first area. 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.

[0112] The distance between the subpixels may be 10 μm or less, and specifically may be 8 μm, 7.4 μm, or 6.4 μm.

[0113] The pixels may be arranged in a known manner in a plan view. For example, they may be in a stripe arrangement, a delta arrangement, a pentile arrangement, or a Bayer arrangement. The shape of the subpixels in a plan view may be any known shape. For example, they may be rectangular, quadrilaterals such as diamonds, or hexagons. Of course, a shape that is close to a rectangle, rather than an exact shape, is included in the rectangle. The shape of the subpixels and the pixel arrangement may be used in combination.

[0114] [Use of the organic light-emitting device according to one embodiment of the present invention] The organic light-emitting device according to one embodiment of the present invention 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, a light-emitting device having a white light source and a color filter, etc.

[0115] The display device may be an image information processing device that has an image input unit that inputs image information from an area CCD, a linear CCD, a memory card, etc., has an information processing unit that processes the input information, and displays the input image on the display unit.

[0116] The display unit of the imaging device or inkjet printer may have a touch panel function. The driving method of this touch panel function may be an infrared method, a capacitance method, a resistive film method, or an electromagnetic induction method, and is not particularly limited. The display device may also be used in the display unit of a multifunction printer.

[0117] Next, the display device according to this embodiment will be described with reference to the drawings.

[0118] 8A and 8B are cross-sectional views showing examples of a display device having an organic light-emitting element and a transistor connected to the organic light-emitting element. The transistor is an example of an active element. The transistor may be a thin-film transistor (TFT).

[0119] 8A shows an example of a pixel, which is a component of the display device according to this embodiment. The pixel includes subpixels 10. The subpixels are divided into 10R, 10G, and 10B based on their light emission. The emitted colors may be distinguished by the wavelength of light emitted from the light-emitting layer, or the light emitted from the subpixels may be selectively transmitted or color-converted using a color filter or the like. Each subpixel includes a reflective electrode 2, which serves as a first electrode, on an interlayer insulating layer 1; an insulating layer 3 covering the edges of the reflective electrode 2; an organic compound layer 4 covering the first electrode and the insulating layer; a transparent electrode 5; a protective layer 6; and a color filter 7.

[0120] A transistor and a capacitor may be disposed below or inside the interlayer insulating layer 1. The transistor and the first electrode may be electrically connected via a contact hole or the like (not shown).

[0121] The insulating layer 3 is also called a bank or pixel separation film. It covers the edges of the first electrode and surrounds the first electrode. The part where the insulating layer is not provided contacts the organic compound layer 4 and becomes the light-emitting region.

[0122] The organic compound layer 4 includes a hole injection layer 41 , a hole transport layer 42 , a first light-emitting layer 43 , a second light-emitting layer 44 , and an electron transport layer 45 .

[0123] The second electrode 5 may be a transparent electrode, a reflective electrode, or a semi-transparent electrode.

[0124] The protective layer 6 reduces the penetration of moisture into the organic compound layer. Although the protective layer is illustrated as a single layer, it may be a multi-layer. Each layer may be an inorganic compound layer and an organic compound layer.

[0125] The color filters 7 are divided into 7R, 7G, and 7B depending on their colors. The color filters may be formed on a planarization film (not shown). A resin protective layer (not shown) may be provided on the color filters. The color filters may be formed on a protective layer 6. Alternatively, the color filters may be provided on an opposing substrate such as a glass substrate and then bonded thereto.

[0126] The display device 100 in Fig. 8B includes an organic light-emitting element 26 and a TFT 18 as an example of a transistor. A substrate 11 made of glass, silicon, or the like is provided with an insulating layer 12 on top of it. An active element 18 such as a TFT is disposed on the insulating layer, and a gate electrode 13, a gate insulating film 14, and a semiconductor layer 15 of the active element are disposed on top of it. The TFT 18 also includes the semiconductor layer 15, a drain electrode 16, and a source electrode 17. An insulating film 19 is disposed on top of the TFT 18. An anode 21 constituting the organic light-emitting element 26 and the source electrode 17 are connected via a contact hole 20 provided in the insulating film.

[0127] The electrical connection between the electrodes (anode, cathode) included in the organic light-emitting element 26 and the electrodes (source electrode, drain electrode) included in the TFT is not limited to the embodiment shown in Fig. 1B. 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.

[0128] 8B shows the organic compound layer as a single layer, the organic compound layer 22 may be a multi-layer structure. A first protective layer 24 and a second protective layer 25 are provided on the cathode 23 to reduce deterioration of the organic light-emitting element.

[0129] Although the display device 100 in FIG. 8B uses transistors as switching elements, other switching elements may be used instead.

[0130] The transistors used in the display device 100 of Fig. 8B are not limited to transistors using single-crystal silicon wafers, but may also be thin-film transistors having an active layer on an insulating surface of a substrate. Examples of active layers include single-crystal silicon, amorphous silicon, microcrystalline silicon, and other non-single-crystal silicon, as well as non-single-crystal oxide semiconductors such as indium zinc oxide and indium gallium zinc oxide. Thin-film transistors are also called TFT elements.

[0131] The transistors included in the display device 100 of Fig. 8B may be formed within a substrate such as a Si substrate. Here, "formed within a substrate" means that the substrate itself, such as a Si substrate, is processed to form the transistors. In other words, having a transistor within a substrate can be seen as the substrate and the transistor being integrally formed.

[0132] The organic light-emitting element according to this embodiment has its emission brightness controlled by a TFT, which is an example of a switching element. By providing multiple organic light-emitting elements on a surface, an image can be displayed based on the emission brightness of each element. Note that the switching element according to this embodiment is not limited to a TFT, and may be a transistor formed from low-temperature polysilicon or an active matrix driver formed on a substrate such as a Si substrate. "On the substrate" can also be referred to as "inside the substrate." Whether to provide a transistor in the substrate or to use a TFT is determined by the size of the display unit. For example, for a display size of about 0.5 inches, it is preferable to provide the organic light-emitting element on a Si substrate.

[0133] 9 is a schematic diagram illustrating an example of a display device according to this embodiment. The display device 1000 may include 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. The touch panel 1003 and the display panel 1005 are connected by flexible printed circuits FPCs 1002 and 1004. Transistors are printed on the circuit board 1007. The battery 1008 may not be provided if the display device is not a portable device, and may be provided in a different position even if the display device is a portable device.

[0134] The display device according to this embodiment may have color filters having red, green, and blue colors, which may be arranged in a delta arrangement.

[0135] The display device according to the present embodiment may be used as a display unit of a mobile terminal. In this case, the display device may have both a display function and an operation function. Examples of the mobile terminal include a mobile phone such as a smartphone, a tablet, and a head-mounted display.

[0136] The display device according to this embodiment may be used as a display unit of 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. The imaging 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 imaging device or a display unit disposed within a viewfinder. The imaging device may be a digital camera or a digital video camera.

[0137] 10A is a schematic diagram showing an example of an imaging device according to this embodiment. The imaging device 1100 may have a viewfinder 1101, a rear display 1102, an operation unit 1103, and a housing 1104. The viewfinder 1101 may have a display device according to this embodiment. In this case, the display device 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 speed at which the subject is moving, the possibility that the subject will be blocked by an obstruction, and the like.

[0138] Since the optimum timing for capturing an image is very short, it is better to display information as soon as possible. Therefore, it is preferable to use a display device using the organic light-emitting element of the present invention. This is because the organic light-emitting element has a fast response speed. A display device using an organic light-emitting element can be used more preferably than a liquid crystal display device, which requires a high display speed.

[0139] The imaging device 1100 has an optical section (not shown). The optical section has multiple lenses, which form an image on an imaging element housed in a housing 1104. The focus of the multiple lenses can be adjusted by adjusting their relative positions. This operation can also be performed automatically. The imaging device may also be called a photoelectric conversion device. Instead of sequentially capturing images, the photoelectric conversion device can include an imaging method that detects the difference from the previous image, or a method of cutting out an image from a constantly recorded image, etc.

[0140] FIG. 10B is a schematic diagram illustrating an example of an electronic device according to 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 may be a biometric recognition unit that recognizes a fingerprint to perform operations such as unlocking. An electronic device having a communication unit can also be called a communication device. The electronic device may further have a camera function by including a lens and an image sensor. An image captured by the camera function is displayed on the display unit. Examples of the electronic device include a smartphone and a laptop computer.

[0141] 11A and 11B are schematic diagrams illustrating an example of a display device according to this embodiment. FIG. 11A illustrates a display device such as a television monitor or a PC monitor. A display device 1300 has a frame 1301 and a display unit 1302. The light-emitting device according to this embodiment may be used in the display unit 1302.

[0142] It has a frame 1301 and a base 1303 that supports a display unit 1302. The base 1303 is not limited to the form shown in Fig. 11A. The bottom side of the frame 1301 may also serve as the base.

[0143] 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.

[0144] FIG. 11B is a schematic diagram illustrating another example of a display device according to this embodiment. Display device 1310 in FIG. 11B has a foldable display surface. Display device 1310 includes first display unit 1311, second display unit 1312, housing 1313, and bending point 1314. First display unit 1311 and second display unit 1312 may include a light-emitting device according to this embodiment. First display unit 1311 and second display unit 1312 may be a single, seamless display device. First display unit 1311 and second display unit 1312 can be separated by the bending point. First display unit 1311 and second display unit 1312 may display different images, or the first and second display units may display a single image.

[0145] FIG. 12A is a schematic diagram illustrating an example of a lighting device according to this embodiment. The lighting device 1400 may include a housing 1401, a light source 1402, a circuit board 1403, an optical film 1404, and a light diffusion unit 1405. The light source may include an organic light-emitting element according to this embodiment. The optical filter may be a filter that improves the color rendering of the light source. The light diffusion unit can effectively diffuse light from the light source, such as for illumination, and deliver the light over a wide area. The optical filter and the light diffusion unit may be provided on the light output side of the lighting. If necessary, a cover may be provided on the outermost part.

[0146] The lighting device is, for example, a device for illuminating a room. The lighting device may emit white, daylight white, or any other color from blue to red. It may have a dimming circuit for dimming these colors. The lighting device may have the organic light-emitting element of the present invention and a power supply circuit connected thereto. The power supply circuit is a circuit for converting AC voltage to DC voltage. Furthermore, white has a color temperature of 4200K, and daylight white has a color temperature of 5000K. The lighting device may have a color filter.

[0147] The lighting device according to this embodiment may also include a heat dissipation unit, which dissipates heat from within the device to the outside, and may be made of a material such as a metal with a high specific heat capacity or liquid silicon.

[0148] 12B is a schematic diagram of an automobile, which is an example of a moving body according to this embodiment. The automobile has tail lamps, which are an example of lighting fixtures. The automobile 1500 has tail lamps 1501, and may be configured to turn on the tail lamps when braking or the like is performed.

[0149] A tail lamp 1501 may include an organic light-emitting element according to this embodiment. The tail lamp may include a protective member for protecting the organic EL element. The protective member may be made of any material as long as it has a certain degree of strength and is transparent, but it is preferably made of polycarbonate or the like. Polycarbonate may be mixed with a furandicarboxylic acid derivative, an acrylonitrile derivative, or the like.

[0150] An automobile 1500 may have a body 1503 and a window 1502 attached thereto. The window may be a transparent display as long as it is not a window for checking the front and rear of the automobile. The transparent display may have an organic light-emitting element according to this embodiment. In this case, constituent materials of the electrodes and the like of the organic light-emitting element are made of transparent materials.

[0151] The moving body according to this embodiment may be a ship, an aircraft, a drone, or the like. The moving body may have a body and a lighting device provided on the body. The lighting device may emit light to indicate the position of the body. The lighting device has the organic light-emitting element according to this embodiment.

[0152] 13A and 13B are schematic diagrams of an eyeglass-type display device, which is an example of a wearable device to which a light-emitting device according to an embodiment of the present invention is applied. The display device can be applied to systems that can be worn as a wearable device, such as smart glasses, HMDs, and smart contact lenses. An image capturing and displaying device used in such an application example may include an image capturing device capable of photoelectrically converting visible light and a displaying device capable of emitting visible light.

[0153] 13A illustrates glasses 1600 (smart glasses) according to one application example. An imaging device 1602 such as a CMOS sensor or SPAD is provided on the front side of a lens 1601 of the glasses 1600. Furthermore, a display device according to any of the above-described embodiments is provided on the back side of the lens 1601.

[0154] 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 display device according to each embodiment. The control device 1603 also controls the operations of the image capture device 1602 and the display device. The lens 1601 is formed with an optical system for focusing light onto the image capture device 1602.

[0155] FIG. 13B illustrates glasses 1610 (smart glasses) according to one application example. The glasses 1610 include a control device 1612, which is equipped with an imaging device equivalent to the imaging device 1602 and a display device. A lens 1611 includes an optical system for projecting light emitted from the imaging device and the display device within the control device 1612, and an image is projected onto the lens 1611. The control device 1612 functions as a power source for supplying power to the imaging device and the display device and controls the operation of the imaging device and the display device. The control device may include a gaze detection unit that detects the wearer's gaze. Infrared light may be used for gaze detection. The infrared light emitter emits infrared light toward the eyeball of a user gazing at a displayed image. An imaging unit with a light receiving element detects the reflected light of the emitted infrared light from the eyeball, thereby obtaining an image of the eyeball. A reduction unit that reduces light from the infrared light emitter to the display unit in a planar view reduces degradation of image quality.

[0156] The gaze of the user relative to the displayed image is detected from an image of the eyeball obtained by capturing infrared light. Any known method can be used for gaze detection using an image of the eyeball. One example is a gaze detection method based on the Purkinje image formed by reflection of irradiated light on the cornea.

[0157] More specifically, gaze detection processing is performed based on the pupil-corneal reflex method, which calculates a gaze vector representing the direction (rotation angle) of the eyeball based on the pupil image and Purkinje image included in the captured image of the eyeball, thereby detecting the user's gaze.

[0158] A display device according to an embodiment of the present invention may have an imaging device having a light receiving element, and may control the image displayed on the display device based on information about the user's line of sight from the imaging device.

[0159] Specifically, the display device determines a first field of view area where the user gazes and a second field of view area other than the first field of view area based on the 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 display device, or may be determined by an external control device and received. In the display area of ​​the display device, 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.

[0160] The display area includes a first display area and a second display area different from the first display area, and a high-priority area is determined from the first display area and the second display 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 display device, or may be determined by an external control device and received. The resolution of the high-priority area may be controlled to be higher than the resolution of areas other than the high-priority area. In other words, the resolution of an area with a relatively low priority may be lowered.

[0161] Note that 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 gaze and the distance to an object in the line of sight from an image of the eyeball, using as training 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 display device, the imaging device, or an external device. If included in an external device, it is transmitted to the display device via communication.

[0162] When display control is performed based on visual recognition detection, the smart glasses can be preferably applied to smart glasses that further include an imaging device for capturing images of the outside world. The smart glasses can display captured external information in real time.

[0163] As described above, by using a device using the organic light-emitting element according to this embodiment, it is possible to provide a stable display with good image quality even over a long period of time.

[0164] The present invention is not limited to the above-described embodiments, and various modifications and variations can be made without departing from the spirit and scope of the present invention. Therefore, the following claims are appended to apprise the public of the scope of the present invention. [Explanation of symbols]

[0165] 1. Interlayer insulation layer 2 reflective electrode 3. Insulation layer 4 Organic compound layer 5 Transparent electrode 6 Protective layer 7 Color Filters 10 subpixels 11 Circuit Board 12 Insulating layer 13 Gate electrode 14 Gate insulating film 15 Semiconductor layer 16 Drain electrode 17 Source electrode 18 Thin-film transistor 19 Insulating film 20 Contact Hole 21 Lower electrode 22 Organic compound layer 23 Upper electrode 24 First protective layer 25 Second protective layer 26 Organic light-emitting devices 100 display device 110 Light-emitting device 120 Optical Lens 130 Eyeball 1000 display devices 1001 Top cover 1002 Flexible Printed Circuit 1003 Touch Panel 1004 Flexible Printed Circuit 1005 Display panel 1006 frames 1007 Circuit Board 1008 Battery 1009 Lower cover 1100 Imaging device 1101 Viewfinder 1102 Rear display 1103 Operation section 1104 Case 1200 Electronic equipment 1201 Display section 1202 Operation unit 1203 Case 1300 display device 1301 Picture Frame 1302 Display section 1303 Foundation 1310 Display device 1311 First display section 1312 Second display section 1313 Case 1314 bending point 1400 lighting equipment 1401 Case 1402 Light source 1403 Circuit Board 1404 Optical film 1405 Light diffusion part 1500 cars 1501 tail lamp 1502 Window 1503 Body 1600 Smart Glasses 1601 Lens 1602 Imaging device 1603 Control device 1610 Smart Glasses 1611 Lens 1612 control device

Claims

1. a substrate having a main surface, a first light-emitting element, a second light-emitting element, a third light-emitting element, and a fourth light-emitting element arranged on the main surface, a first lens onto which light emitted from the first light-emitting element is incident, a second lens onto which light emitted from the second light-emitting element is incident, a third lens onto which light emitted from the third light-emitting element is incident, and a fourth lens onto which light emitted from the fourth light-emitting element is incident, a first insulating layer defining a light-emitting region of the first light-emitting element, a second insulating layer defining a light-emitting region of the second light-emitting element, a third insulating layer defining a light-emitting region of the third light-emitting element, and a fourth insulating layer defining a light-emitting region of the fourth light-emitting element; a light emitting device in which the first light emitting element and the second light emitting element emit a first light which is a fluorescent light, and the third light emitting element and the fourth light emitting element emit a second light which has a wavelength different from that of the first light and is a phosphorescent light, In a cross section perpendicular to the main surface, a distance between a midpoint of a light-emitting region of the second light-emitting element and a vertex of the second lens in a direction parallel to the main surface is larger than a distance between a midpoint of a light-emitting region of the first light-emitting element and a vertex of the first lens in a direction parallel to the main surface, a distance between a midpoint of the light-emitting region of the fourth light-emitting element and a vertex of the fourth lens in a direction parallel to the main surface is greater than a distance between a midpoint of the light-emitting region of the third light-emitting element and a vertex of the third lens in a direction parallel to the main surface; a difference between a distance between a midpoint of the light-emitting region of the second light-emitting element and a vertex of the second lens in a direction parallel to the main surface and a distance between a midpoint of the light-emitting region of the first light-emitting element and a vertex of the first lens in a direction parallel to the main surface is equal to or less than a difference between a distance between a midpoint of the light-emitting region of the fourth light-emitting element and a vertex of the fourth lens in a direction parallel to the main surface and a distance between a midpoint of the light-emitting region of the third light-emitting element and a vertex of the third lens in a direction parallel to the main surface, the size of the light-emitting region of the second light-emitting element is equal to or smaller than the size of the light-emitting region of the first light-emitting element; the size of the light-emitting region of the fourth light-emitting element is smaller than the size of the light-emitting region of the third light-emitting element; The difference between the size of the light-emitting region of the second light-emitting element and the size of the light-emitting region of the first light-emitting element is a light-emitting device, characterized in that the size of the light-emitting region of the fourth light-emitting element is equal to or smaller than the difference in size between the light-emitting region of the third light-emitting element;

2. 2. The light emitting device according to claim 1, wherein the light emitting area of ​​the fourth light emitting element is smaller than the light emitting area of ​​the second light emitting element.

3. 3. The light emitting device according to claim 1, wherein the size of the light emitting region of the third light emitting element is smaller than the size of the light emitting region of the first light emitting element.

4. 3. The light emitting device according to claim 1, wherein the size of the light emitting region of the second light emitting element is the same as the size of the light emitting region of the first light emitting element.

5. 2. The light emitting device according to claim 1, wherein the wavelength of the first light is shorter than the wavelength of the second light.

6. 6. The light emitting device according to claim 1, wherein the first light is blue light, and the second light is red or green light.

7. 7. The light-emitting device according to claim 1, wherein the distance between the midpoint of the light-emitting region of the second light-emitting element and the vertex of the second lens is equal to the distance between the midpoint of the light-emitting region of the fourth light-emitting element and the vertex of the fourth lens.

8. 8. The light-emitting device according to claim 1, wherein the difference between the distance between the midpoint of the light-emitting region of the second light-emitting element and the vertex of the second lens in a direction parallel to the main surface and the distance between the midpoint of the light-emitting region of the first light-emitting element and the vertex of the first lens in a direction parallel to the main surface is equal to the difference between the distance between the midpoint of the light-emitting region of the fourth light-emitting element and the vertex of the fourth lens in a direction parallel to the main surface and the distance between the midpoint of the light-emitting region of the third light-emitting element and the vertex of the third lens in a direction parallel to the main surface.

9. a fifth light-emitting element disposed between the first light-emitting element and the second light-emitting element and adjacent to the second light-emitting element; and a fifth lens onto which light emitted from the fifth light-emitting element is incident; 9. The light-emitting device according to claim 1, wherein in a cross section perpendicular to the main surface, the distance between the midpoint of the light-emitting region of the fifth light-emitting element and the vertex of the fifth lens in a direction parallel to the main surface is equal to the distance between the midpoint of the light-emitting region of the second light-emitting element and the vertex of the second lens in a direction parallel to the main surface.

10. The light-emitting device described in claim 9, characterized in that the difference between the size of the light-emitting region of the fifth light-emitting element and the size of the light-emitting region of the second light-emitting element is smaller than the difference between the size of the light-emitting region of the second light-emitting element and the size of the light-emitting region of the first light-emitting element.

11. a sixth light-emitting element adjacent to the second light-emitting element, and a sixth lens onto which light emitted from the sixth light-emitting element is incident, the second light-emitting element being disposed between the first light-emitting element and the sixth light-emitting element; 11. The light-emitting device according to claim 9, wherein in a cross section perpendicular to the main surface, the distance between the midpoint of the light-emitting region of the sixth light-emitting element and the vertex of the sixth lens in a direction parallel to the main surface is greater than the distance between the midpoint of the light-emitting region of the second light-emitting element and the vertex of the second lens in a direction parallel to the main surface.

12. 12. The light emitting device according to claim 11, wherein the light emitting area of ​​the sixth light emitting element is smaller than the light emitting area of ​​the second light emitting element.

13. a seventh light-emitting element disposed between the third light-emitting element and the fourth light-emitting element and adjacent to the fourth light-emitting element; and a seventh lens onto which light emitted from the seventh light-emitting element is incident; 13. The light-emitting device according to claim 1, wherein in a cross section perpendicular to the main surface, the distance between the midpoint of the light-emitting region of the seventh light-emitting element and the vertex of the seventh lens in a direction parallel to the main surface is equal to the distance between the midpoint of the light-emitting region of the fourth light-emitting element and the vertex of the fourth lens in a direction parallel to the main surface.

14. The light-emitting device described in claim 13, characterized in that the difference between the size of the light-emitting region of the seventh light-emitting element and the size of the light-emitting region of the fourth light-emitting element is smaller than the difference between the size of the light-emitting region of the fourth light-emitting element and the size of the light-emitting region of the third light-emitting element.

15. an eighth light-emitting element adjacent to the fourth light-emitting element, and an eighth lens onto which light emitted from the eighth light-emitting element is incident, the fourth light-emitting element being disposed between the third light-emitting element and the eighth light-emitting element; 15. The light-emitting device according to claim 13, wherein in a cross section perpendicular to the main surface, the distance between the midpoint of the light-emitting region of the eighth light-emitting element and the vertex of the eighth lens in a direction parallel to the main surface is greater than the distance between the midpoint of the light-emitting region of the fourth light-emitting element and the vertex of the fourth lens in a direction parallel to the main surface.

16. 16. The light emitting device according to claim 15, wherein the light emitting area of ​​the eighth light emitting element is smaller than the light emitting area of ​​the fourth light emitting element.

17. a fifth light-emitting element disposed between the first light-emitting element and the second light-emitting element and adjacent to the second light-emitting element; and a fifth lens onto which light emitted from the fifth light-emitting element is incident; In a cross section perpendicular to the main surface, a distance between a midpoint of the light-emitting region of the fifth light-emitting element and a vertex of the fifth lens in a direction parallel to the main surface is smaller than a distance between a midpoint of the light-emitting region of the second light-emitting element and a vertex of the second lens in a direction parallel to the main surface; 9. The light-emitting device according to claim 1, wherein in a cross section perpendicular to the main surface, the distance between the midpoint of the light-emitting region of the fifth light-emitting element and the vertex of the fifth lens in a direction parallel to the main surface is greater than the distance between the midpoint of the light-emitting region of the first light-emitting element and the vertex of the first lens in a direction parallel to the main surface.

18. 18. The light emitting device according to claim 17, wherein the light emitting area of ​​the fifth light emitting element is larger than the light emitting area of ​​the second light emitting element and smaller than the light emitting area of ​​the first light emitting element.

19. a sixth light-emitting element adjacent to the second light-emitting element, and a sixth lens onto which light emitted from the sixth light-emitting element is incident, the second light-emitting element being disposed between the first light-emitting element and the sixth light-emitting element; 19. The light-emitting device according to claim 17 or 18, characterized in that, in a cross section perpendicular to the main surface, the distance between the midpoint of the light-emitting region of the sixth light-emitting element and the vertex of the sixth lens in a direction parallel to the main surface is greater than the distance between the midpoint of the light-emitting region of the second light-emitting element and the vertex of the second lens in a direction parallel to the main surface.

20. 20. The light emitting device according to claim 19, wherein the light emitting area of ​​the sixth light emitting element is smaller than the light emitting area of ​​the second light emitting element.

21. a seventh light-emitting element disposed between the third light-emitting element and the fourth light-emitting element and adjacent to the fourth light-emitting element; and a seventh lens onto which light emitted from the seventh light-emitting element is incident; In a cross section perpendicular to the main surface, a distance between a midpoint of the light-emitting region of the seventh light-emitting element and a vertex of the seventh lens in a direction parallel to the main surface is smaller than a distance between a midpoint of the light-emitting region of the fourth light-emitting element and a vertex of the fourth lens in a direction parallel to the main surface; 21. The light-emitting device according to claim 17, wherein in a cross section perpendicular to the main surface, the distance between the midpoint of the light-emitting region of the seventh light-emitting element and the vertex of the seventh lens in a direction parallel to the main surface is greater than the distance between the midpoint of the light-emitting region of the third light-emitting element and the vertex of the third lens in a direction parallel to the main surface.

22. 22. The light emitting device according to claim 21, wherein the light emitting area of ​​the seventh light emitting element is smaller than the light emitting area of ​​the third light emitting element and larger than the light emitting area of ​​the fourth light emitting element.

23. a substrate having a main surface, a first light-emitting element, a second light-emitting element, a third light-emitting element, and a fourth light-emitting element arranged on the main surface, a first lens onto which light emitted from the first light-emitting element is incident, a second lens onto which light emitted from the second light-emitting element is incident, a third lens onto which light emitted from the third light-emitting element is incident, and a fourth lens onto which light emitted from the fourth light-emitting element is incident, a light emitting device in which the first light emitting element and the second light emitting element emit a first light, and the third light emitting element and the fourth light emitting element emit a second light having a wavelength different from that of the first light, In a cross section perpendicular to the main surface, a distance between a midpoint of a light-emitting region of the second light-emitting element and a vertex of the second lens in a direction parallel to the main surface is larger than a distance between a midpoint of a light-emitting region of the first light-emitting element and a vertex of the first lens in a direction parallel to the main surface, a distance between a midpoint of the light-emitting region of the fourth light-emitting element and a vertex of the fourth lens in a direction parallel to the main surface is greater than a distance between a midpoint of the light-emitting region of the third light-emitting element and a vertex of the third lens in a direction parallel to the main surface; a difference between a distance between a midpoint of the light-emitting region of the second light-emitting element and a vertex of the second lens in a direction parallel to the main surface and a distance between a midpoint of the light-emitting region of the first light-emitting element and a vertex of the first lens in a direction parallel to the main surface is equal to or less than a difference between a distance between a midpoint of the light-emitting region of the fourth light-emitting element and a vertex of the fourth lens in a direction parallel to the main surface and a distance between a midpoint of the light-emitting region of the third light-emitting element and a vertex of the third lens in a direction parallel to the main surface, A light emitting device, characterized in that the lens efficiency of the first lens is smaller than the lens efficiency of the second lens, the lens efficiency of the third lens is smaller than the lens efficiency of the fourth lens, and the lens efficiency of the fourth lens is smaller than the lens efficiency of the second lens.

24. 24. A display device comprising a plurality of pixels, at least one of the plurality of pixels comprising the light-emitting device according to claim 1, and a display control means for controlling display of the light-emitting device.

25. an optical unit having a plurality of lenses, an image pickup element that receives light that has passed through the optical unit, and a display unit that displays an image picked up by the image pickup element; An imaging device, wherein the display unit comprises the light-emitting device according to claim 1 .

26. 24. An electronic device comprising: a display unit having the light-emitting device according to claim 1; a housing in which the display unit is provided; and a communication unit provided in the housing for communicating with an external device.

Images