Color filter and display device

Abstract

To provide a color filter in which, of a simple structure though, front luminance and color reproducibility are improved.SOLUTION: The color filter comprises: a first subpixel having a first transmission wavelength band; a first lens arranged facing the first subpixel; a second subpixel included in a plurality of subpixels constituting a unit pixel P or other unit pixels, having a second transmission wavelength band that is different from the first transmission wavelength band, and adjacent to the first subpixel; a second lens arranged facing the second subpixel and arranged adjacent to the first lens in the same direction as the direction in which the second subpixel is adjacent to the first subpixel; and a planarization layer arranged between the first and second subpixels and the first and second lenses. The thickness t1 and width in adjacent direction of the first and second subpixels, the thickness t2 of the planarization layer, the width of the first and second lenses in the adjacent direction, and the distance between the lenses have a specific relation.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a color filter and a display device. [Background technology]

[0002] For example, in a display device such as an organic electroluminescence (EL) display device, a configuration is known in which multiple organic EL elements that emit white light are arranged in one pixel region that displays color, and a colored filter and a lens are arranged above each organic EL element. For example, Patent Document 1 discloses an organic EL display device in which three organic EL elements that generate white light are arranged in one pixel region, and above each of them are provided colored filters that transmit red (R), green (G), and blue (B) light, and a lens is provided above each colored filter. For example, Patent Document 2 discloses a display device in which a light-emitting element including an organic layer formed in a concave shape that generates white light is arranged in one pixel region, and colored filters that transmit R, G, and B light respectively are provided on top of each of the light-emitting elements, and lenses are provided on each of the colored filters. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2014-2880 A [Patent Document 2] JP 2019-133816 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, the above-mentioned conventional techniques have the following problems. The lenses in Patent Documents 1 and 2 are provided to improve the front luminance of the light from the light emitting element. In Patent Document 1, a microlens is formed on a color filter composed of sub-pixels that form display light of red, green, and blue wavelength components, which are provided in a unit pixel of size 12 μm×12 μm. A large gap is provided between the sub-pixels to prevent color mixing. This reduces the aperture ratio of the color filter, making it difficult to improve the resolution. In Patent Document 2, the light emitted from the concave organic layer is collected by an internal lens, transmitted through a colored filter, and emitted to the outside through an on-chip microlens arranged at the outermost part. Furthermore, a black matrix is ​​formed between the colored filters, and these functions work together to prevent the light from the light-emitting element from emitting through the adjacent colored filters. In this case, the front luminance can be improved and color mixing can be suppressed, but the manufacturing cost increases because the manufacturing steps of forming the organic layer in a concave shape and forming the black matrix are added.

[0005] The present invention has been made in consideration of the above-mentioned problems, and has an object to provide a color filter and a display device that have good front luminance and color reproducibility even with a simple configuration. [Means for solving the problem]

[0006] In order to solve the above problems, a color filter according to a first aspect of the present invention comprises a first subpixel, the first subpixel being included in a plurality of subpixels constituting a unit pixel in a color display, and having a first transmission wavelength range; a first lens arranged opposite the first subpixel in a thickness direction of the first subpixel; a second subpixel, the first subpixel being included in a plurality of subpixels constituting the unit pixel or another unit pixel adjacent to the unit pixel, the first subpixel being adjacent to the first subpixel, and having the same thickness as the first subpixel and a second transmission wavelength range different from the first transmission wavelength range; a second lens arranged opposite the second subpixel in the thickness direction of the second subpixel and adjacent to the first lens in the same direction as the adjoining direction of the second subpixel to the first subpixel; and a planarization layer arranged between the first subpixel and the second subpixel, and the first lens and the second lens, and the color filter satisfies the following formulas (1) to (5).

number

[0007] In the above color filter, the unit pixel and the other unit pixel may each have different transmission wavelength ranges of red, green, and blue, respectively, and include three sub-pixels aligned in the same adjacent direction, the three sub-pixels having equal lengths in a direction perpendicular to the adjacent direction, and at least one pair of adjacent sub-pixels among the three sub-pixels may satisfy the formulas (1) to (5).

[0008] In the above color filter, the unit pixel and the other unit pixels include a first color subpixel having a transmission wavelength range of a first color, which is any one of red, green, and blue, a second color subpixel having a transmission wavelength range of a second color, which is different from the first color among the red, green, and blue, and a third color subpixel, which is elongated in one direction, having a transmission wavelength range of a third color, which is different from the first color and the second color among the red, green, and blue, wherein the first color subpixel and the second color subpixel are adjacent to each other in a longitudinal direction of the third color subpixel, and the first color subpixel and the second color subpixel are adjacent to each other in a lateral direction intersecting the longitudinal direction of the third color subpixel, and wherein at least one pair of adjacent subpixels among the first color subpixel, the second color subpixel, and the third color subpixel satisfy formulas (1) to (5).

[0009] A display device according to a second aspect of the present invention includes the above color filter and a plurality of light-emitting elements facing the plurality of sub-pixels constituting the unit pixel, respectively.

[0010] In the display device, the light-emitting element may be an organic EL element. Effect of the Invention

[0011] According to the color filter and display device of the present invention, even with a simple configuration, good front luminance and color reproducibility can be achieved. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a schematic plan view illustrating an example of a display device according to a first embodiment of the present invention. [Diagram 2] 2 is a cross-sectional view taken along line F2-F2 in FIG. [Diagram 3] FIG. 2 is a schematic light ray diagram illustrating the function of the color filter according to the first embodiment of the present invention. [Figure 4] FIG. 4 is a schematic light ray diagram showing the effect of the color filter of the first comparative example. [Diagram 5] FIG. 11 is a schematic light ray diagram showing the effect of the color filter of the second comparative example. [Figure 6] FIG. 13 is a schematic light ray diagram showing the effect of the color filter of the third comparative example. [Figure 7] FIG. 11 is a schematic plan view illustrating an example of a display device according to a second embodiment of the present invention. [Figure 8] 8 is a cross-sectional view taken along line F8-F8 in FIG. 7. [Figure 9] 8 is a cross-sectional view taken along line F9-F9 in FIG. 7. [Figure 10] 8 is a cross-sectional view taken along line F10-F10 in FIG. 7. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In all the drawings, even if the embodiments are different, the same or corresponding parts are given the same reference numerals, and common explanations will be omitted.

[0014] [First embodiment] A color filter and a display device according to a first embodiment of the present invention will be described. Fig. 1 is a schematic plan view showing an example of a display device according to a first embodiment of the present invention, Fig. 2 is a cross-sectional view taken along line F2-F2 in Fig. 1.

[0015] The organic EL display device 100 (display device) shown in Fig. 1 displays a color image based on an image signal. The use of the organic EL display device 100 is not particularly limited. For example, the organic EL display device 100 can be used as a display device for electronic devices such as smart glasses, head-mounted displays, and electronic viewfinders. 1 shows the configuration of a unit pixel P in a plan view of an organic EL display device 100 according to the present embodiment. Here, the plan view means a view from the display screen of the organic EL display device 100 toward the light emitting element. The plan view also means a view from the thickness direction of a filter section 3, which will be described later.

[0016] A unit pixel P is the smallest area for color display. For example, in an organic EL display device 100, a large number of unit pixels P shown in Fig. 1 are arranged adjacent to each other in an x ​​direction from left to right in the figure and in a y direction from bottom to top in the figure. The z direction is a direction perpendicular to the x and y directions, which extends from the back to the front of the paper in the figure. The z direction is the opposite direction to the planar view direction. The outer shape of the display screen formed by all the unit pixels P of the organic EL display device 100 is a rectangle with sides in the x and y directions. The width of the unit pixel P in the x direction is Wx, and the width in the y direction is Wy. Wx and Wy may be equal to each other or different from each other. For example, in the example shown in FIG. 1, Wx is 1 / 5 times Wy. For simplicity, the width of an area, member, etc. in the x direction may be referred to as the x width, and the width in the y direction may be referred to as the y width, hereinafter. The unit pixel P has a first sub-pixel area P1, a second sub-pixel area P2, and a third sub-pixel area P3. The first sub-pixel area P1, the second sub-pixel area P2, and the third sub-pixel area P3 are arranged in this order in the x-direction. The first sub-pixel area P1, the second sub-pixel area P2, and the third sub-pixel area P3 divide the unit pixel P into three equal parts in the x-direction. In the organic EL display device 100, the configuration of each unit pixel P is the same, so the following description will be given taking an example of a single unit pixel P.

[0017] The first sub-pixel area P1 is a rectangle with an x-width of Wx / 3 and a y-width of Wy in a plan view. The first sub-pixel area P1 displays, for example, red. The second sub-pixel area P2 is a rectangle with an x-width of Wx / 3 and a y-width of Wy in a plan view. The second sub-pixel area P2 displays, for example, green. The third sub-pixel area P3 is a rectangle with an x-width of Wx / 3 and a y-width of Wy in a plan view. The third sub-pixel area P3 displays, for example, blue color.

[0018] As shown in FIG. 2, the organic EL display device 100 has a main body 9 and a color filter 10.

[0019] The main body 9 includes a substrate 6 , a light emitting element 5 , and a planarizing film 4 . The planar shape of the substrate 6 is larger than the display screen of the organic EL display device 100. The substrate 6 is formed of, for example, a silicon substrate.

[0020] The light-emitting element 5 emits white light. For example, an organic EL element may be used as the light-emitting element 5. The organic EL element generates excitons by applying a DC voltage between the anode and the cathode, injecting electrons and holes into the light-emitting layer and recombining them, and emits light by utilizing the emission of light when the excitons are deactivated. The light-emitting elements 5 are provided in each of the first sub-pixel area P1, the second sub-pixel area P2, and the third sub-pixel area P3. As shown in FIG. 1, the planar shape of each light-emitting element 5 is a rectangle slightly smaller than the outer shape of the first sub-pixel area P1, second sub-pixel area P2, and third sub-pixel area P3 in which it is arranged. In the example shown in FIG. 1, the x-width of each light-emitting element 5 is slightly narrower than Wx / 3, and the y-width is slightly narrower than Wy. The light emitting element 5 is manufactured on a silicon substrate using, for example, a semiconductor manufacturing process.

[0021] The electrodes of each light-emitting element 5 are connected to a drive circuit (not shown) through wiring formed on the substrate 6. The drive circuit controls the turning on and off of each light-emitting element 5 based on an image signal.

[0022] 2, the planarization film 4 covers at least the substrate 6 and the light-emitting element 5 in each unit pixel P, and forms a flat surface 4a on its surface in the z direction. The flat surface 4a is a plane that extends over the entire display area of ​​the organic EL display device 100. The planarization film 4 protects the light emitting element 5 by covering the light emitting element 5. For example, the planarization film 4 prevents moisture, oxygen, and the like from coming into contact with the light emitting element 5, thereby suppressing deterioration of the light emitting element 5. The material of the planarization film 4 is a transparent resin material having a good transmittance for visible light. It is more preferable that the material of the planarization film 4 is a material having a high barrier property against at least one of moisture and oxygen. The thickness of the planarization film 4 on the light emitting element 5 is, for example, 0.1 μm.

[0023] The color filter 10 has, in the z direction, a filter portion 3, a planarizing layer 2, and a lens 1 in this order.

[0024] The filter portion 3 is a layer having an upper surface 3a and a lower surface 3b and a thickness t1. The conditions that t1 satisfies will be described later. The filter portion 3 covers the planarizing film 4 with the lower surface 3b in close contact with the flat surface 4a. The filter section 3 regulates the transmission wavelength of light incident from each light emitting element 5 via the planarizing film 4 .

[0025] The filter portion 3 is made up of a first colored layer 31 (sub-pixel), a second colored layer 32 (sub-pixel), and a third colored layer 33 (sub-pixel). The first colored layer 31 is overlaid on the first subpixel region P1. The first colored layer 31 forms a subpixel having a transmission wavelength range of, for example, red. The second colored layer 32 is disposed adjacent to the first colored layer 31 in the x-direction. The second colored layer 32 is overlaid on the second subpixel region P2. The second colored layer 32 forms a subpixel having, for example, a green transmission wavelength range. The third colored layer 33 is disposed adjacent to the second colored layer 32 in the x-direction. The third colored layer 33 is overlaid on the third subpixel region P3. The third colored layer 33 forms a subpixel having, for example, a blue transmission wavelength range.

[0026] In this embodiment, the first colored layer 31, the second colored layer 32, and the third colored layer 33 have a planar shape as viewed in the thickness direction, which is a rectangle elongated in the y direction and is the same shape as the first sub-pixel region P1, the second sub-pixel region P2, and the third sub-pixel region P3, respectively. Therefore, the first colored layer 31, the second colored layer 32, and the third colored layer 33, which form the three sub-pixels, are formed into a shape that divides the unit pixel P into three equal parts in the x direction. The first colored layer 31, the second colored layer 32, and the third colored layer 33 each have an x-width of wx (=Wx / 3) and a y-width of Wy.

[0027] The filter portion 3 is formed by solidifying a resin composition in which color materials corresponding to the respective transmission wavelength ranges are dispersed in a transparent resin.

[0028] The planarizing layer 2 is a layer having a thickness t2 laminated on the upper surface 3a of the filter portion 3. The conditions that t2 satisfies will be described later. An upper surface 2 a of the planarizing layer 2 is a flat surface parallel to a lower surface 3 b of the filter portion 3 . The material of the planarizing layer 2 is a transparent resin material having a good transmittance to visible light.

[0029] The lenses 1 are disposed opposite to each other in the thickness direction (z direction) of the first colored layer 31, the second colored layer 32, and the third colored layer 33, with the planarizing layer 2 sandwiched therebetween, and collect light passing through the first colored layer 31, the second colored layer 32, and the third colored layer 33. The collected light is emitted to the outside of the color filter 10, centered on the optical axis of each lens 1 extending in the z direction.

[0030] 1, in this embodiment, the lenses 1 are arranged two by two in the longitudinal direction (y direction) of each of the first sub-pixel area P1, the second sub-pixel area P2, and the third sub-pixel area P3. However, the number of lenses 1 in the longitudinal direction of the first sub-pixel area P1, the second sub-pixel area P2, and the third sub-pixel area P3 may be changed as appropriate depending on the length in the longitudinal direction. The y-width of each lens 1 is Ly. The distance between adjacent lenses 1 in the y-direction is dy. From the viewpoint of improving the light extraction efficiency, it is preferable that dy is small. For example, dy may be 0. In the example shown in FIG. 1, the y-width Ly of each lens is (Wy / 2-dy).

[0031] The x-width of each lens 1 is Lx. The distance between adjacent lenses 1 in the x-direction is dx. The conditions that Lx and dx satisfy will be described later. For example, the planar shape of each lens 1 is a rectangle with an x-width of Lx and a y-width of Ly, with the four corners rounded into an arc. In particular, when Lx=Ly, the planar shape of each lens 1 may be a circle.

[0032] In this embodiment, in plan view, there are gaps at least in the x direction and in the diagonal direction of each lens 1, and an upper surface 2a of the flattening layer 2 is exposed.

[0033] The material of the lens 1 is a transparent resin material having a good transmittance for visible light. The material of the lens 1 may be the same as or different from that of the planarization layer 2. When the material of the lens 1 is different from that of the planarization layer 2, the refractive indexes of the two materials may be different. In the example shown in Fig. 2, each lens 1 has a plane 1b and a convex lens surface 1a in this order in the z direction. Here, the plane 1b is an interface with the planarization layer 2. However, when the lens 1 and the planarization layer 2 are made of the same material, no interface is formed between the lens 1 and the planarization layer 2, and therefore the plane 1b is a virtual surface. When the lens 1 and the planarization layer 2 have the same refractive index, even if the plane 1b is formed, the plane 1b does not function as a refractive surface or a reflective surface. In the following, unless otherwise specified, an example will be described in which the lens 1 and the planarizing layer 2 are made of the same material and have the same refractive index.

[0034] Each lens 1 is a convex lens whose convex lens surface 1a has positive refractive power. The shape of each convex lens surface 1a is appropriately determined in consideration of the light collection performance and light extraction efficiency of the lens 1. For example, each convex lens surface 1a may be a hemispherical shape convex in the z direction. Here, hemispherical includes a hemispherical surface, a hemispherical surface in which the hemispherical height is smaller than the radius, and an aspherical surface close to these hemispherical surfaces and hemispherical surfaces. By having such a shape, each lens 1 can condense the radiation light emitted by the light emitting element 5. The optical axis O of each lens 1 passes through the center of the lens 1 and extends in the z direction. As shown in FIG. 2, each optical axis O is located at the center of the width (short side width) of each light emitting element 5 in the x direction.

[0035] In the color filter 10 of the present embodiment, a specific subpixel having a first transmission wavelength range is referred to as a first subpixel, a subpixel adjacent to the first subpixel and having a second transmission wavelength range different from the first transmission wavelength range is referred to as a second subpixel, and lenses 1 facing the first and second subpixels, respectively, are referred to as a first lens and a second lens, and the respective shapes of the lenses are formed to satisfy the following formulas (1) to (5).

[0036]

number

[0037] Here, t1 is the thickness of the first and second subpixels, t2 is the thickness of the planarization layer 2, w is the width of the first and second subpixels in the adjacent direction, L is the width of the first and second lenses in the adjacent direction, and d is the distance between the first and second lenses in the adjacent direction.

[0038] As shown in formula (1), T represents the total thickness of the filter section 3 and the planarization layer 2. In the filter section 3 and the planarization layer 2, the light emitted from the light emitting element 5 is refracted in accordance with the refractive index difference between the filter section 3 and the second lens 2, but travels in a substantially straight line when the refractive index difference is small. The condition of formula (2) is that the total thickness T of the filter portion 3 and the planarization layer 2 is less than the width w of each of the first and second subpixels. If T is greater than or equal to w, the range in which the first and second lenses collect the light emitted from the light-emitting element 5 is narrowed, resulting in a decrease in front luminance. On the other hand, if light with a large radiation angle is easily collected, the proportion of light emitted from the edge of the first subpixel that is leaked through the adjacent second subpixel and emitted from the second lens toward the front increases. In this case, the leaked light is tinted differently from the first transmission wavelength range of the first subpixel by transmitting through the second subpixel. If the leaked light with a tint different from the first transmission wavelength range is observed mixed together, color reproducibility may be reduced depending on the amount of leaked light. In this embodiment, in order to prevent leaked light from being emitted toward the front, a distance is provided between the first lens and the second lens in the adjoining direction, thereby forming a gap between the lenses. Equation (3) defines the appropriate gap size d. Equation (5) represents the width L of the first lens and the second lens when the distance between the lenses is d. Expression (4) defines the range of the width L of the first lens and the second lens within which the front luminance can be easily optimized. When the width of the first lens and the second lens is w, the distance between the lenses becomes 0, and no gap is formed in the adjacent direction. If the width of the first and second lenses is less than 0.8×w, the leaked light is less likely to be directed toward the front, but the numerical aperture of the first and second lenses becomes too small, which reduces the light extraction efficiency of the display light having an appropriate transmission wavelength range and the front brightness.

[0039] In this embodiment, the first colored layer 31 and the second colored layer 32, and the second colored layer 32 and the third colored layer 33, which are adjacent to each other in the x direction within the unit pixel P, respectively configure a first subpixel and a second subpixel. Since the first colored layer 31 of a unit pixel P is adjacent to the third colored layer 33 of another unit pixel P adjacent to it in the direction opposite to the x direction, the first colored layer 31 and the third colored layer 33 of the other unit pixel P adjacent to it constitute a first subpixel and a second subpixel. Since the third colored layer 33 of a unit pixel P is adjacent to the first colored layer 31 of another unit pixel P adjacent in the x direction, the third colored layer 33 and the first colored layer 31 constitute a first subpixel and a second subpixel. In this embodiment, for any of the first and second subpixels described above, the relationships w=wx, d=dx, and L=Lx in formulas (1) to (5) are satisfied.

[0040] On the other hand, in this embodiment, in the y direction and the direction opposite to the y direction, subpixels having different transmission wavelength regions are not adjacent to each other, either within the unit pixel P or between the unit pixel P and another unit pixel P adjacent to it. Therefore, in the y direction and the direction opposite to the y direction, there are no subpixels corresponding to the first subpixel and the second subpixel that should satisfy the formulas (1) to (5). For example, in the y direction and the direction opposite to the y direction, it is more preferable that dy is closer to 0.

[0041] The organic EL display device 100 can be manufactured by forming a light-emitting element 5 on a substrate 6 using a semiconductor manufacturing process, laminating a planarization film 4 on the substrate 6 and the light-emitting element 5 to form a main body portion 9, and forming a filter portion 3, a planarization layer 2, and a lens 1 on the flat surface 4a. For example, the filter portion 3 can be formed by preparing resin compositions in which the color materials forming the first colored layer 31, the second colored layer 32, and the third colored layer 33 are dispersed in a photosensitive resin, and then forming a hardened layer of each resin composition on the flat surface 4a by a photolithography method in which the resin compositions are exposed to light through a pattern mask and developed. For example, the lenses 1 can be formed by forming a resin layer that forms the planarization layer 2 and the lenses 1 on the filter portion 3, and then forming the convex lens surface 1a of each lens 1 and the flat portion F on the surface of the resin layer by an etch-back method. The planarization layer 2 is formed by the layered portion of the resin layer that is not etched.

[0042] The operation of the organic EL display device 100 will be described, focusing on the operation of the color filter 10. FIG. 3 is a schematic light ray diagram showing the function of the color filter according to the first embodiment of the present invention.

[0043] In the organic EL display device 100, the light emission of the light emitting element 5 facing the first colored layer 31 is controlled based on an image signal of a red component (hereinafter, R signal). Similarly, the light emission of the light emitting element 5 facing the second colored layer 32 is controlled based on an image signal of a green component (hereinafter, G signal), and the light emitting element 5 facing the third colored layer 33 is controlled based on an image signal of a blue component (hereinafter, B signal). In the unit pixel P, light from the light-emitting element 5 driven by an R signal passes through the first colored layer 31 and is emitted to the outside, light from the light-emitting element 5 driven by a G signal passes through the second colored layer 32 and is emitted to the outside, and light from the light-emitting element 5 driven by a B signal passes through the third colored layer 33 and is emitted to the outside, thereby displaying a color faithful to the image signal.

[0044] 3, consider light rays that are incident on points A, B, and C on the lower surface 3b of the first colored layer 31. Points A, B, and C are points that face in the z direction to the end of the light-emitting element 5 facing the first colored layer 31 on the opposite side in the x direction, the center in the x direction, and the end in the x direction, respectively. For example, a light ray R1 traveling from point B in the z direction passes through the first colored layer 31, the flattening layer 2, and the convex lens surface 1a1 facing the first colored layer 31, in that order, and is emitted in the z direction. For example, a light ray R2 that moves in the z direction toward the x direction is incident from point B. The angle of the light ray R2 with respect to the z direction may be, for example, up to about 45° in order to obtain an appropriate light extraction efficiency. In this case, in this embodiment, since the color filter 10 satisfies the formulas (1) to (5), the light ray R2 passes through the first colored layer 31, the flattening layer 2, and the convex lens surface 1a2 facing the second colored layer 32 in this order, and is emitted in the z direction. The emission direction of the light ray R2 proceeds in a direction inclined with respect to the z direction depending on the light collecting performance of the convex lens surface 1a2. However, since the light ray R2 is refracted at the convex lens surface 1a2, even if it deviates from the z direction, it does not deviate too much from the z direction. In FIG. 3, the light ray R2 is depicted as proceeding in the z direction for schematic purposes. The same applies to other light rays emitted from the convex lens surface 1a. In the following, unless otherwise specified, when a light ray travels in the z direction, it includes the case where the light ray travels strictly in the z direction and the case where the light ray travels approximately in the z direction.

[0045] Like light rays R1 and R2, light rays that enter the first colored layer 31 from point B, pass through the first colored layer 31, pass through the planarization layer 2, and exit from both the convex lens surface 1a1 facing the first colored layer 31 and the convex lens surface 1a2 adjacent to it in the x-direction are both red light. Light ray R3, which travels from point A parallel to light ray R2, passes through the first colored layer 31, then passes through the flattening layer 2 without passing through the second colored layer 32, and is emitted in the z direction from the convex lens surface 1a2. For this reason, light ray R3 is red light. Therefore, the light beams R1 and R2 form red light corresponding to the R signal. According to this embodiment, even light emitted in an oblique direction from the light emitting element 5, such as light rays R2 and R3, is emitted in the z direction through the convex lens surface 1a2 adjacent in the x direction. Therefore, the front luminance of the red light can be improved compared to the case where light rays R2 and R3 travel approximately straight in an oblique direction.

[0046] A light ray R4 traveling from point C parallel to the light ray R2 passes through the first colored layer 31, then the second colored layer 32, and passes through the flattening layer 2 to be emitted from the upper surface 2a. The color of the light ray R4 is close to green because the length through the second colored layer 32 is longer than the length through the first colored layer 31. Since the light ray R4 is close to green light emitted based on the R signal, if the light ray R4 is observed mixed with the display light, it will cause an error in the green component in the unit pixel P. In this embodiment, the light ray R4 is emitted from the upper surface 2a, which has no refractive power. Although the light ray R4 is refracted at the upper surface 2a according to Snell's law, it travels in a substantially straight line compared to when it passes through the convex lens surface 1a. Therefore, the light ray R4 travels in a direction inclined at approximately 45° with respect to the z direction. Since light ray R4 travels in a direction inclined at approximately 45° in the x direction relative to the front surface, when observation is centered on the front surface, it does not mix with the display light of unit pixel P. As a result, color mixing in the observation direction centered on the front surface is suppressed, resulting in good color reproducibility.

[0047] The operation of this embodiment will be described in comparison with a comparative example. Fig. 4 is a schematic light ray diagram showing the function of a color filter of a first comparative example, Fig. 5 is a schematic light ray diagram showing the function of a color filter of a second comparative example, and Fig. 6 is a schematic light ray diagram showing the function of a color filter of a third comparative example.

[0048] As shown in FIG. 4, an organic EL display device 200A of the first comparative example has the same configuration as the organic EL display device 100, except that instead of the planarization layer 2 of the organic EL display device 100, a planarization layer 2A is provided. The planarization layer 2A is similar to the planarization layer 2, except that the thickness t2A is smaller than t2. Therefore, in this comparative example, TA=t1+t2A is smaller than T in this embodiment. This comparative example is an example in which the relationship of formula (3) is not satisfied due to the thin planarizing layer 2A. In this comparative example, the height of each convex lens surface 1a and upper surface 2a measured from upper surface 3a is reduced, but light ray R1 is emitted in the same manner as in this embodiment. Light rays R2 and R3 are emitted from different positions on each convex lens surface 1a than in the embodiment, but their emission directions are the same as in this embodiment. In contrast to this, in this comparative example, since convex lens surface 1a2 is low, light ray R4 passes through convex lens surface 1a2 and exits, and thus exits in the z direction, similar to light ray R2. For this reason, when observed from the front, the greenish light ray R4 mixes with the display light, causing color mixing, which reduces color reproducibility.

[0049] As shown in FIG. 5, an organic EL display device 200B of the second comparative example has the same configuration as the organic EL display device 100, except that instead of the lens 1 of the organic EL display device 100, a lens 1B is provided. Lens 1B has a convex lens surface 1aB instead of the convex lens surface 1a of lens 1. Lens 1B is similar to lens 1 except that its width in the x direction is LxB, which is equal to wx. For this reason, this comparative example is an example in which when w is greater than T, L is equal to w, and so the distance between lenses 1B is 0. This comparative example is an example in which the relationship between formulas (3) and (4) is not satisfied because the width of lens 1B in the adjacent direction is too large. In this comparative example, at least in a cross section in the adjacent direction (cross section perpendicular to the y direction), adjacent convex lens surfaces 1a1B and 1a2B of convex lens surfaces 1aB are in contact with each other, and therefore upper surface 2a is not exposed between lenses 1B. In this comparative example, in addition to the light rays R1, R2, and R3 being emitted in the z direction, the light ray R4 is also emitted in the z direction from the convex lens surface 1a2B, similar to the light ray R2. For this reason, when observed from the front, the greenish light ray R4 mixes with the display light, causing color mixing, which reduces color reproducibility.

[0050] 6, an organic EL display device 200C of the third comparative example has the same configuration as the organic EL display device 100, except that it has a planarization layer 2A and a lens 1B instead of the planarization layer 2 and the lens 1 of the organic EL display device 100. This comparative example is a combination of the first comparative example and the second comparative example. Therefore, this comparative example, like the first and second comparative examples, is an example in which the relationships of formulas (3) and (4) are not satisfied. In this comparative example, similar to the second comparative example, the light rays R1, R2, and R3 are emitted in the z direction, and in addition, the light ray R4 is emitted in the z direction from the convex lens surface 1a2B, similar to the light ray R2. For this reason, when observed from the front, the greenish light ray R4 mixes with the display light, causing color mixing, which reduces color reproducibility.

[0051] The above explanation was given using an example of an oblique light ray that travels in the x direction as it travels in the z direction. However, to explain a light ray that travels in the opposite direction to the x direction as it travels in the z direction, the above-mentioned x direction can be interpreted as the opposite direction to the x direction. In the above, an example has been described in which the first and second subpixels are the first colored layer 31 and the second colored layer 32, but the same applies to other combinations of the first and second subpixels.

[0052] As described above, the organic EL display device 100 of this embodiment is provided with color filter 10 that satisfies expressions (1) to (5) for the first and second subpixels and the first and second lenses adjacent to each other in the x direction, and therefore has good front luminance and color reproducibility. In order to suppress color mixing, it is possible to provide a light-shielding wall between adjacent sub-pixels or between adjacent lenses. However, providing such a light-shielding wall with precision may increase manufacturing costs. Furthermore, even light that does not cause color mixing may be absorbed by the light-shielding wall, which may reduce the light extraction efficiency and front brightness. In contrast, in this embodiment, no light-shielding wall is provided, which simplifies the configuration of the color filter 10. As a result, the manufacturing cost can be reduced, and the front brightness can be easily improved.

[0053] [Second embodiment] A color filter and a display device according to a second embodiment of the present invention will now be described. Fig. 7 is a schematic plan view showing an example of a display device according to a second embodiment of the present invention. Fig. 8 is a cross-sectional view taken along line F8-F8 in Fig. 7. Fig. 9 is a cross-sectional view taken along line F9-F9 in Fig. 7. Fig. 10 is a cross-sectional view taken along line F10-F10 in Fig. 7.

[0054] An organic EL display device 101 (display device) of this embodiment shown in Fig. 7 includes unit pixels P10 each having a rectangular shape in a planar view, instead of each of the unit pixels P of the organic EL display device 100 of the first embodiment. The use of the organic EL display device 101 is not particularly limited. For example, like the organic EL display device 100, the organic EL display device 101 can be used as a display device for electronic devices such as smart glasses, head-mounted displays, and electronic viewfinders. The following description will focus on the differences from the first embodiment.

[0055] The x-width of the unit pixel P10 is 2×wx, and the y-width is Wy. In particular, when 2×wx=Wy, the shape of the unit pixel P10 in plan view is a square. The unit pixel P10 has a first sub-pixel area P11, a second sub-pixel area P12, and a third sub-pixel area P13. The second sub-pixel area P12 and the first sub-pixel area P11 are arranged in this order in the y direction. The third sub-pixel area P13 is arranged adjacent to the first sub-pixel area P11 and the second sub-pixel area P12 on the x-direction side.

[0056] The first sub-pixel area P11 is a rectangle with an x-width of wx and a y-width of Wy / 2 in plan view. The first sub-pixel area P11 displays, for example, red. The second sub-pixel area P12 is a rectangle with an x-width of wx and a y-width of Wy / 2 in plan view. The second sub-pixel area P12 displays, for example, green. The third sub-pixel region P13 is a long and narrow rectangle with an x-width of wx and a y-width of Wy in a plan view. The third sub-pixel region P13 displays, for example, blue.

[0057] As shown in FIG. 8, the organic EL display device 101 has a main body 19 and a color filter 11.

[0058] The main body 19 has a light emitting element 15 instead of the light emitting element 5 of the main body 9 in the first embodiment. The light-emitting element 15 is similar to the light-emitting element 5 in the first embodiment except for its shape in plan view. The light-emitting element 15 has a light-emitting element 15A provided in the first sub-pixel region P11 and the second sub-pixel region P12, and a light-emitting element 15B provided in the third sub-pixel region P13. For example, an organic EL element may be used as the light-emitting element 15. As shown in FIG. 7, the planar shape of each light-emitting element 15A is a rectangle that is slightly smaller than the outer shape of the first sub-pixel area P11 and the second sub-pixel area P12 in which it is disposed. The light emitting elements 15B have a rectangular shape in plan view that is slightly smaller than the outline of the third sub-pixel region P13 in which they are arranged.

[0059] The color filter 11 has a filter portion 13 instead of the filter portion 3 of the color filter 10 in the first embodiment.

[0060] The filter section 13 has, instead of the first colored layer 31 and the second colored layer 32 of the filter section 3, a first colored layer 41 (sub-pixel) and a second colored layer 42 (sub-pixel).

[0061] The first colored layer 41 is overlaid on the first sub-pixel region P11. The first colored layer 41 has, for example, a red transmission wavelength range. 9, the second colored layer 42 is disposed adjacent to the first colored layer 41 along the y direction. The second colored layer 42 is overlaid on the second sub-pixel region P12. The second colored layer 42 has, for example, a green transmission wavelength range. The first colored layer 41 and the second colored layer 42 each have a rectangular shape in plan view with an x-width of wx and a y-width of wy (=Wy / 2).

[0062] 8 and 9, the third colored layer 33 in this embodiment is the same as that in the first embodiment except that it is overlaid on the third sub-pixel region P13. The shape of the third colored layer 33 in a plan view is a rectangle elongated in the y direction with an x ​​width of wx and a y width of 2×wy.

[0063] The filter section 13 is formed in the same manner as the filter section 3, except that the planar shape and arrangement of the sub-pixels are different.

[0064] The lenses 1 in this embodiment are similar to the lenses 1 in the first embodiment, except that four lenses 1 are arranged in the unit pixel P10. For this reason, in this embodiment, one lens 1 is disposed in each of the first sub-pixel area P11 and the second sub-pixel area P12, and two lenses 1 are disposed in the third sub-pixel area P13. The lenses 1 are disposed so as to face the first colored layer 41, the second colored layer 42, and the third colored layer 33, respectively, with the planarizing layer 2 interposed therebetween. In particular, the two lenses 1 facing the third colored layer 33 are disposed side by side in the y direction, which is the longitudinal direction of the third colored layer 33. As shown in FIG. 8, between the lenses 1 adjacent to each other in the x direction, a gap dx is provided, similar to the first embodiment. As shown in FIGS. 9 and 10, the lenses 1 adjacent to each other in the y direction have a similar gap dy therebetween.

[0065] In this embodiment, the first colored layer 41 and the third colored layer 33, and the second colored layer 42 and the third colored layer 33, which are adjacent to each other in the x direction within the unit pixel P10, respectively configure a first subpixel and a second subpixel. Since the first colored layer 41 of the unit pixel P10 is adjacent to the third colored layer 33 of another unit pixel P10 adjacent in the direction opposite to the x direction, the first colored layer 41 and the third colored layer 33 of the other unit pixel P10 adjacent thereto form a first subpixel and a second subpixel. Similarly, the second colored layer 42 and the third colored layer 33 of the other unit pixel P10 adjacent thereto form a first subpixel and a second subpixel. Similarly, the third colored layer 33 of the unit pixel P10 and the first colored layer 41 or the second colored layer 42 of another unit pixel P10 adjacent to the unit pixel P10 in the x direction configure a first subpixel and a second subpixel. In this embodiment, the first and second subpixels adjacent to each other in the x direction satisfy the relationships w=wx, d=dx, and L=Lx in the above formulas (1) to (5).

[0066] In this embodiment, the first colored layer 41 and the second colored layer 42 adjacent to each other in the y direction within the unit pixel P10 constitute a first subpixel and a second subpixel. Since the first colored layer 41 of the unit pixel P10 is adjacent to the second colored layer 42 of another unit pixel P10 adjacent to it in the y direction, the first colored layer 41 and the second colored layer 42 of the other unit pixel P10 adjacent thereto form a first subpixel and a second subpixel. Similarly, the second colored layer 42 and the first colored layer 41 of the other unit pixel P10 adjacent thereto form a first subpixel and a second subpixel. In this embodiment, the first and second subpixels adjacent to each other in the y direction satisfy the relationships of w=wy, d=dy, and L=Ly in the above formulas (1) to (5).

[0067] The organic EL display device 101 of this embodiment has the same configuration as the organic EL display device 100, except that the shape and arrangement of the sub-pixels in the color filter 11 are different. The organic EL display device 101 includes a color filter 11 that satisfies expressions (1) to (5) for the first and second subpixels and the first and second lenses that are adjacent to each other in the x and y directions, respectively. As a result, similar to the first embodiment, the front luminance and color reproducibility are excellent.

[0068] In the above embodiments, the light-emitting element is an organic EL element. However, the type of the light-emitting element is not limited to an organic EL element. For example, an example of the light-emitting element may be an inorganic LED element.

[0069] In the above embodiments, the first sub-pixel region, the second sub-pixel region, and the third sub-pixel region are respectively provided with red, green, and blue sub-pixels. However, the colors and positions of the sub-pixels are not limited to this as long as the unit pixel can display a color. EXAMPLES

[0070] Examples 1 and 2 of the color filter and display device according to the first embodiment will be described together with Comparative Examples 1 and 2. The configurations and evaluation results of Examples 1 and 2 and Comparative Examples 1 and 2 are shown in Table 1 below.

[0071] [Table 1]

[0072] [Example 1] Example 1 is an example corresponding to the first embodiment. The size of the unit pixel P in the organic EL display device 100 of Example 1 was Wx=Wy=7.2 (μm), and the x width×y width of the first subpixel area P1, the second subpixel area P2, and the third subpixel area P3 were 2.4 μm×7.2 μm, respectively. The first colored layer 31, the second colored layer 32, and the third colored layer 33 (hereinafter sometimes referred to as each subpixel) each had an x ​​width×y width of 2.4 μm×7.2 μm. As shown in Table 1, the width w of the extension in the adjacent direction was 2.4 μm. The thickness t1 of each subpixel was 1.0 μm. The thickness t2 of the planarization layer 2 was 1.2 μm. Three lenses 1 were provided facing each sub-pixel. The x width x y width of each lens 1 was 2.0 μm x 2.0 μm. The lenses 1 were arranged with a gap of 0.4 μm between them in the x direction so that the optical axis of each lens coincided with the center of each subpixel in the x direction. The lenses 1 were arranged with a gap of 0.4 μm between them in the y direction. For this reason, as shown in [Table 1], the width L of each lens 1 in the x direction, which is the adjacent direction, was 2.0 μm, and the distance d between each lens 1 was 0.4 μm. The color filter 10 of this example satisfied all of the expressions (1) to (5) in the x direction.

[0073] To manufacture the organic EL display device 100 of Example 1, a TFT layer was formed on a silicon substrate by using a known method such as a sputtering method or an etching method. Furthermore, a white organic EL element was formed on the TFT layer by using a known method such as a vapor deposition method, and then the organic EL element substrate was formed by covering the TFT layer with silicon nitride by a CVD method. Here, the silicon substrate and the white organic EL element correspond to the substrate 6 and the light emitting element 5, respectively.

[0074] To manufacture the filter portion 3, red, green and blue photosensitive coloring compositions RR-1, GR-1 and BR-1 having the compositions shown in the following Table 2 were prepared.

[0075] [Table 2]

[0076] In [Table 1], "resin" is the binder, and "monomer" is the curing agent. The initiator is an additive for causing the curing agent to undergo a radical polymerization reaction. The chain transfer agent is an additive for promoting radical polymerization.

[0077] The red coloring material R-1 used in the photosensitive coloring composition RR-1 was prepared as follows. After the mixture MR having the following composition was mixed uniformly, it was dispersed for 5 hours in a sand mill using glass beads having a diameter of 1 mm. After that, the mixture MR was filtered through a 5 μm filter to obtain a red coloring material R-1. In the mixture MR, Ilgarfor Red B-CF (trade name; manufactured by BASF) was used as CI Pigment Red 254. Paliotol (registered trademark) Yellow L 2146HD (trade name; manufactured by BASF) was used as CI Pigment Yellow 139.

[0078] (Composition of mixture MR) Red pigment: CI Pigment Red 254 78 parts by weight Yellow pigment: CI Pigment Yellow 139 22 parts by weight Acrylic varnish (20% solids) 215 parts by weight

[0079] The green coloring material G-1 used in the photosensitive coloring composition GR-1 was prepared in the same manner as the coloring material R-1, except that the mixture MG was replaced with the mixture MG having the following composition. In the mixture MG, FASTOGEN (registered trademark) GREEN A110 (product name; manufactured by DIC Corporation) was used as CI Pigment Green 58. Paliotol (registered trademark) Yellow L 1155 (product name; manufactured by BASF) was used as CI Pigment Yellow 185.

[0080] (Composition of mixture MG) Green pigment: CI Pigment Green 58 65 parts by weight Yellow pigment: CI Pigment Yellow 185 35 parts by weight Acrylic varnish (20% solids) 215 parts by weight

[0081] The blue coloring material B-1 used in the photosensitive coloring composition BR-1 was prepared in the same manner as the coloring material R-1, except that the mixture MB having the following composition was used instead of the mixture MG. In the mixture MB, LIONOL (registered trademark) BLUE ES (product name; manufactured by Toyo Color Co., Ltd.) was used as CI Pigment Blue 15:6, and LIONOGEN (registered trademark) VIOLET RLUE ES (product name; manufactured by Toyo Color Co., Ltd.) was used as CI Pigment Violet 23.

[0082] (Composition of Mixture MB) Blue pigment: CI Pigment Blue 15:6 63 parts by weight Purple pigment: CI Pigment Violet 23 37 parts by weight Acrylic varnish (20% solids) 215 parts by weight

[0083] The lens 1 and the flattening layer 2 can be formed using a transparent material obtained by removing the coloring material from the photosensitive coloring compositions RR-1, GR-1, and BR-1. For example, the refractive index can be adjusted by adding an inorganic component such as silica, titanium oxide, or zirconium oxide dispersion as a refractive index adjuster instead of a coloring material. By adjusting the type and content of the refractive index adjuster, it is possible to obtain a refractive index in the range of 1.5 to 1.65, for example. In this embodiment, the lens 1 and the planarization layer 2 were made of transparent materials obtained by removing the coloring materials from the photosensitive coloring compositions RR-1, GR-1, and BR-1, and adding titanium oxide to the transparent materials so that the refractive index was 1.6.

[0084] The organic EL display device 100 of this embodiment was manufactured as follows. The transparent resin composition for forming the planarization film 4 was applied to the organic EL element substrate using a spinner so that the film thickness after curing was 0.1 μm. The transparent resin composition was then cured by heating at 100° C. for 10 minutes using a heating oven to form the planarization film 4. This resulted in the formation of the main body 9. A green photosensitive resin composition GR-1 was applied onto the main body 9 using a spinner so that the film thickness of the cured finished product was 1.2 μm. Then, ultraviolet light exposure, alkali development, water washing and drying processes were performed through a pattern mask to provisionally form a second colored layer 32, which was a green subpixel, in each second subpixel region P2. The x width × y width of each second colored layer 32 was 2.4 μm × 7.2 μm. Then, the provisionally formed second colored layer 32 was cured by heating at 80° C. for 10 minutes using a heating oven.

[0085] Thereafter, the first colored layer 31 was formed in the same manner as the second colored layer 32, except that the red photosensitive resin composition RR-1 was used to form the first subpixel region P1. Thereafter, a third colored layer 33 was formed in the same manner as in forming the second colored layer 32, except that the third colored layer 33 was formed using the blue photosensitive resin composition BR-1. In this manner, the filter portion 3 is formed on the main body portion 9 of the first embodiment.

[0086] After forming the filter portion 3, the material for forming the lens 1 and the flattening layer 2 was applied onto the filter portion 3 using a spinner so that the film thickness of the cured finished product was 2.4 μm. Thereafter, the entire coating film was exposed to ultraviolet light, and then heated at 80° C. for 10 minutes in a heating oven to cure the coating film and form a transparent resin layer. Thereafter, convex lenses 1 with a height of 1.2 μm and x and y widths of 2.0 μm were formed on the surface of the transparent resin layer by an etch-back method. Three lenses 1 were formed above each of the first colored layer 31, the second colored layer 32, and the third colored layer 33.

[0087] Thereafter, a cover glass was attached to the surface of the lens 1 using a sealant, Structbond (registered trademark) XMF-T107 (product name; manufactured by Mitsui Chemicals, Inc.) In this way, the organic EL display device 100 of Example 1 was manufactured.

[0088] [Example 2] Example 2 was the same as Example 1, except that the thickness t1 of the subpixel was 1.2 μm and the thickness t2 of the planarizing layer was 1.0 μm. The color filter 10 of this example satisfied all of the expressions (1) to (5) in the x direction.

[0089] [Comparative Example 1] Comparative Example 1 was configured similarly to Example 1, except that the thickness t1 of the subpixel was 1.2 μm, and the x width × y width of the lens was 2.4 μm × 2.4 μm. Therefore, in this comparative example, T = t1 + t2 = 2.4 (μm), w = 2.4 (μm), L = 2.4 (μm), and d = 0 (μm). This comparative example did not satisfy the formulas (2) and (4).

[0090] [Comparative Example 2] Comparative Example 2 was configured similarly to Example 1, except that the thickness t1 of the subpixel was 1.2 μm and the thickness t2 of the planarization layer was 1.4 μm. Therefore, in this comparative example, T = t1 + t2 = 2.6 (μm), w = 2.4 (μm), L = 2.4 (μm), and d = 0 (μm). This comparative example did not satisfy formula (2).

[0091] [evaluation] Examples 1 and 2 and Comparative Examples 1 and 2 were evaluated for color reproducibility. In this evaluation, the organic EL display devices of Examples 1 and 2 and Comparative Examples 1 and 2 were each lit in a single color of red, green, and blue, and the displayed colors were observed from the front (z direction). Furthermore, three types of monochromatic organic EL display devices (hereinafter, monochromatic devices) were manufactured by forming all sub-pixels in red, green, or blue in the organic EL display devices of Examples 1 and 2 and Comparative Examples 1 and 2, and the display of each color was observed from the front. In the monochromatic device, the light emitted from the light-emitting element is transmitted only through sub-pixels of the same color, so no color mixing occurs. Then, the colors displayed in monochrome by the organic EL display devices of Examples 1 and 2 and Comparative Examples 1 and 2 were compared with the display of the same colors by a monochrome machine for each color. If the color of the monochrome display looked the same as the color displayed on a monochrome machine of the same color, the color reproduction was judged to be good (marked A in [Table 1]). If the color of the monochrome display appeared to have changed from the color displayed on the same monochrome machine, the color reproduction was judged to be poor (marked as B in [Table 1]).

[0092] [Evaluation Results] As shown in [Table 1], the color reproducibility was good in Examples 1 and 2. This is thought to be because in Examples 1 and 2, the color filter 10 satisfied all of the formulas (1) to (5), and therefore most of the light transmitted through adjacent subpixels was emitted to the outside from the upper surface 2a, and the amount of light heading toward the front was small. In contrast, color reproducibility was poor in Comparative Examples 1 and 2. This is believed to be because in Comparative Examples 1 and 2, some of the formulas (1) to (5) were not satisfied, and therefore the amount of light passing through adjacent sub-pixels and directed forward increased due to the focusing effect of the lenses facing the adjacent sub-pixels.

[0093] Although the preferred embodiments of the present invention have been described above with reference to the examples, the present invention is not limited to the embodiments and examples. Addition, omission, substitution, and other modifications of the configuration are possible without departing from the spirit of the present invention. Furthermore, the present invention is not limited by the foregoing description, but only by the scope of the appended claims. [Explanation of symbols]

[0094] 1, 1B Lens 1a, 1a1, 1a1B, 1a2, 1a2B Convex lens surface 2, 2A planarization layer 2a Top side 3, 13 Filter section 4 Planarization film 5, 15, 15A, 15B Light emitting element 6 Substrate 9, 19 Main body 10, 11 Color filters 31, 41 First colored layer (subpixel) 32, 42 Second colored layer (subpixel) 33 Third colored layer (sub-pixel) 100, 101 Organic EL display device (display device) P, P10 unit pixel P1, P11 1st sub-pixel area P2, P12 Second sub-pixel area P3, P13 3rd sub-pixel area

Claims

1. a first sub-pixel included in a plurality of sub-pixels constituting a unit pixel for color display, the first sub-pixel having a first transmission wavelength range; a first lens disposed opposite the first subpixel in a thickness direction of the first subpixel; a second subpixel that is included in a plurality of subpixels constituting the unit pixel or another unit pixel adjacent to the unit pixel, the second subpixel having the same thickness as the first subpixel and a second transmission wavelength range different from the first transmission wavelength range, and adjacent to the first subpixel; a second lens disposed opposite the second subpixel in a thickness direction of the second subpixel and adjacent to the first lens in the same direction as an adjacent direction of the second subpixel to the first subpixel; a planarization layer disposed between the first subpixel and the second subpixel and between the first lens and the second lens; Equipped with The following formulas (1) to (5) are satisfied: Color filters. [0010] Here, t1 is the thickness of the first subpixel and the second subpixel, t2 is the thickness of the planarization layer, w is the width of the first subpixel and the second subpixel in the adjacent direction, L is the width of the first lens and the second lens in the adjacent direction, and d is the distance between the first lens and the second lens in the adjacent direction.

2. the unit pixel and the other unit pixel each have a different transmission wavelength range of red, green, and blue, and each include three sub-pixels aligned in the same adjacent direction; The three sub-pixels have equal lengths in a direction perpendicular to the adjacent direction, Among the three sub-pixels, at least one pair of adjacent sub-pixels satisfies the formulas (1) to (5). The color filter according to claim 1 .

3. The unit pixel and the other unit pixel are a first color sub-pixel having a transmission wavelength range of a first color of any one of red, green, and blue; a second color sub-pixel having a transmission wavelength range of a second color among the red, green, and blue colors, the second color sub-pixel being different from the first color; a third color subpixel having a transmission wavelength range of a third color among the red, green, and blue colors, the third color subpixel being elongated in one direction; Contains the first color subpixel and the second color subpixel are adjacent to each other in a longitudinal direction of the third color subpixel, and the first color subpixel and the second color subpixel are adjacent to the third color subpixel in a lateral direction intersecting the longitudinal direction of the third color subpixel, the formulas (1) to (5) are satisfied in at least one pair of adjacent subpixels among the first color subpixel, the second color subpixel, and the third color subpixel; The color filter according to claim 1 .

4. The color filter according to any one of claims 1 to 3, a plurality of light-emitting elements facing the plurality of sub-pixels constituting the unit pixel, respectively; A display device comprising:

5. The light-emitting element is an organic electroluminescence (EL) element. The display device according to claim 4.

Images