JP7589455B2 - Color filter and display device - Google Patents

Description

The present invention relates to a color filter and a display device.

For example, in a display device such as an organic electroluminescence (EL) display device, a configuration is known in which a plurality of organic EL elements that emit white light are arranged in one pixel region that performs color display, 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 colored filters that transmit red (R), green (G), and blue (B) light are provided above each of the organic EL elements, and lenses are provided above each of the colored filters.
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 each of the light-emitting elements, and lenses are provided on each of the colored filters.

JP 2014-2880 A JP 2019-133816 A

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 light from the light emitting element.
In Patent Document 1, the front brightness is improved by concentrating the light emitted from the square organic EL element and transmitted through the colored filter. In Patent Document 1, three organic EL elements having the same shape of the light-emitting area are arranged in a triangular shape in one pixel region, and the colored filters are also arranged in a similar manner. In addition, the lens has a circular shape in a plan view. Therefore, in one pixel, the gaps between the sub-pixels that respectively form the display light of the R, G, and B wavelength components are large. In such a configuration, if the resolution is increased, the sub-pixels become too small, making it difficult to manufacture the color filter, and there is a risk that the resolution cannot be increased.
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 on the outermost side. In this configuration, the colored filter does not become too small even if the resolution is increased, but the organic layer becomes too small, which may make it difficult to increase the brightness.

For example, it is conceivable to divide one pixel region into three in one direction as sub-pixels. For example, it is conceivable to arrange the organic EL element, the colored filter, and the lens in a rectangular shape that divides one side of the pixel into three equal parts. In this case, in a plan view, the sub-pixel becomes a long and narrow rectangle whose longitudinal length is three times its lateral width.
According to such a configuration, the sub-pixels can be arranged without gaps in the pixel region, which is suitable for achieving high resolution.
However, in a lens that is long in one direction, the anisotropy of the refractive power required in the longitudinal and lateral directions becomes large, so that it is difficult to manufacture a small lens with good light extraction efficiency. For example, the radius of curvature in the longitudinal direction becomes too large compared to the radius of curvature in the lateral direction, so that the lens performance becomes close to that of a cylindrical lens, and the light collection performance in the longitudinal direction decreases. As a result, there is a problem that the front brightness decreases and the visibility when viewed obliquely in the longitudinal direction is likely to decrease.

The present invention has been made in consideration of the above problems, and aims to provide a color filter and a display device that have good front luminance and visibility even when the subpixels in the unit pixel region are long in one direction.

In order to solve the above problems, the color filter of the first aspect of the present invention comprises, in an area forming a unit pixel of color display, a plurality of subpixels having mutually different transmission wavelength ranges, and a plurality of lenses arranged opposite each of the plurality of subpixels and concentrating the light transmitted through the plurality of subpixels, at least one of the plurality of subpixels being an elongated pixel having a ratio of the length in the longitudinal direction to the length in the lateral direction greater than 1 when viewed from the thickness direction through which the light is transmitted, and of the plurality of lenses, two or more lenses that concentrating the light transmitted through the elongated pixel are arranged along the longitudinal direction.

In the above color filter, the ratio may be 1.5 or more, and the number of lenses facing the elongated pixels may be equal to the ratio rounded to one decimal place.

In the above color filter, the lenses may be densely arranged in the longitudinal direction.

In the color filter, the plurality of subpixels may include three subpixels having different transmission wavelength ranges of red, green, and blue, and the three subpixels may all be elongated pixels, arranged in parallel in the short direction, and have the same length in the long direction.

In the color filter, the subpixels include a first subpixel having a rectangular shape and a first transmission wavelength range of any one of red, green, and blue, a second subpixel having a rectangular shape and a second transmission wavelength range of the red, green, and blue that is different from the first transmission wavelength range, and a third subpixel having a third transmission wavelength range of the red, green, and blue that is different from the first transmission wavelength range and the second transmission wavelength range, the third subpixel being an elongated pixel in which the ratio is greater than the ratio of the length in the longitudinal direction to the length in the lateral direction of the first subpixel and the second subpixel, respectively, and the first subpixel and the second subpixel may be adjacent to the third subpixel in the lateral direction of the third subpixel and adjacent to each other in the longitudinal direction of the third subpixel.

The color filter may further include a light-shielding wall disposed at least one of between adjacent subpixels among the plurality of subpixels and on the boundary line between the adjacent subpixels.

The display device of the second aspect of the present invention comprises the above-mentioned color filter and a plurality of light-emitting elements each facing the plurality of sub-pixels.

In the above display device, the light-emitting element may be an organic EL element.

The color filter and display device of the present invention provide good front luminance and visibility even when the subpixels in the unit pixel region are long in one direction.

1 is a schematic plan view illustrating an example of a display device according to a first embodiment of the present invention. 2 is a cross-sectional view taken along line F2-F2 in FIG. 1. 3 is a cross-sectional view taken along line F3-F3 in FIG. 1. 3A to 3C are schematic diagrams illustrating the function of the color filter according to the first embodiment of the present invention. 3A to 3C are schematic diagrams illustrating the function of the color filter according to the first embodiment of the present invention. FIG. 1 is a schematic plan view showing an example of a display device of a comparative example. 7 is a cross-sectional view taken along line F7-F7 in FIG. 6. FIG. 11 is a schematic plan view illustrating an example of a display device according to a second embodiment of the present invention. 9 is a cross-sectional view taken along line F9-F9 in FIG. 8. FIG. 13 is a schematic plan view showing an example of a display device according to a first modified example of the second embodiment of the present invention. 11 is a cross-sectional view taken along line F11-F11 in FIG. 10. FIG. 13 is a schematic cross-sectional view showing an example of a display device according to a second modified example of the second embodiment of the present invention. FIG. 13 is a schematic cross-sectional view showing an example of a display device according to a third modified example of the second embodiment of the present invention. FIG. 13 is a schematic cross-sectional view showing an example of a display device according to a fourth modified example of the second embodiment of the present invention. FIG. 11 is a schematic plan view illustrating an example of a display device according to a third embodiment of the present invention. 16 is a cross-sectional view taken along line F15-F15 in FIG. 15. 16 is a cross-sectional view taken along line F16-F16 in FIG. 15.

Below, an embodiment of the present invention will be described with reference to the attached drawings. In all drawings, even if the embodiment is different, the same or corresponding parts are given the same reference numerals, and common explanations will be omitted.

[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. Fig. 3 is a cross-sectional view taken along line F3-F3 in Fig. 1.

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, a head-mounted display, and an electronic viewfinder.
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.

A unit pixel P is the smallest area for color display. For example, in the organic EL display device 100 shown in Fig. 1, a large number of unit pixels P are arranged adjacent to each other in the x direction from left to right in the figure and in the y direction from bottom to top in the figure. The z direction is a direction perpendicular to the x direction and the y direction, 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 having 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 simplicity, the width of a region, 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 unit pixels P all have the same configuration, so the following description will be given using an example of a single unit pixel P.

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

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

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.

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 outline of the first sub-pixel area P1, the second sub-pixel area P2, and the third sub-pixel area P3 in which it is disposed.
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.

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.

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 the 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 covers the light emitting element 5 to protect the light emitting element 5. For example, the planarization film 4 prevents moisture, oxygen, and the like from contacting the light emitting element 5, thereby suppressing deterioration of the light emitting element 5.
The planarization film 4 is made of a transparent resin material having a good transmittance for visible light. It is more preferable that the planarization film 4 is made of 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.

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

The filter portion 3 is a layer portion having a constant thickness and an upper surface 3a and a lower surface 3b. The thickness of the filter portion 3 is not particularly limited. For example, the thickness of the filter portion 3 may be 1.2 μm.
The filter portion 3 covers the planarizing film 4 with the lower surface 3b in close contact with the flat surface 4a.
The filter portion 3 regulates the transmission wavelength of light incident from each light emitting element 5 via the planarizing film 4 .

The filter portion 3 is made up of a first colored layer 31 (sub-pixel, elongated pixel), a second colored layer 32 (sub-pixel, elongated pixel), and a third colored layer 33 (sub-pixel, elongated pixel).
The first colored layer 31 is overlaid on the first sub-pixel region P1. The first colored layer 31 forms a sub-pixel 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.

In this embodiment, the planar shape of each of the first colored layer 31, the second colored layer 32, and the third colored layer 33 as viewed in the thickness direction is a rectangle that is 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 that form the three sub-pixels are formed in a shape that divides the unit pixel P into three equal parts in the x direction.
The ratio of the length of the long side to the length of the short side of a rectangle is called the aspect ratio. When a rectangle is a square, the aspect ratio is 1.
In this embodiment, the length of each subpixel in the short direction is Wx/3 and the length of each subpixel in the long direction is Wy, so that the aspect ratio of each subpixel is 3×Wy/Wx. In particular, when the unit pixel P is a square (Wx=Wy), the aspect ratio of each subpixel is 3.
If a subpixel having an aspect ratio greater than 1 is specifically referred to as an elongated pixel, then in this embodiment, the first colored layer 31, the second colored layer 32, and the third colored layer 33 are all elongated pixels.

The filter section 3 is formed by solidifying a resin composition in which color materials corresponding to each transmission wavelength range are dispersed in a transparent resin.

The planarizing layer 2 is a layer having a constant thickness that is laminated on the upper surface 3a of the filter portion 3. The upper surface 2a of the planarizing layer 2 is a flat surface parallel to the lower surface 3b of the filter portion 3.
The material of the planarizing layer 2 is a transparent resin material having a good transmittance to visible light.

The lenses 1 are arranged facing 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, sandwiching the planarization layer 2, and each focus the light passing through the first colored layer 31, the second colored layer 32, and the third colored layer 33. The focused 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.

As shown in FIG. 1, in this embodiment, three lenses 1 are arranged side by side in the longitudinal direction of each of the first sub-pixel area P1, the second sub-pixel area P2, and the third sub-pixel area P3.
In this embodiment, the lenses 1 are arranged so that a part of the outer edge in a plan view is arranged without gaps in the x direction and the y direction. Therefore, the lenses 1 are arranged densely in the longitudinal directions of the first sub-pixel area P1, the second sub-pixel area P2, and the third sub-pixel area P3. Furthermore, in this embodiment, the lenses 1 are also arranged densely in the lateral directions of the first sub-pixel area P1, the second sub-pixel area P2, and the third sub-pixel area P3.
However, if the necessary light extraction efficiency is obtained, a gap may be formed between the outer edges of each lens 1. In order to improve the light extraction efficiency, it is more preferable that the lenses 1 are densely arranged. For example, a preferred dense arrangement is one in which the minimum value of the gap is 20% or less of the size of the lens in the width direction of the gap. For example, when a gap is provided between the lenses 1 in the y direction, it is more preferable that the width of the gap in the y direction is 0.20 x Dy or less, where Dy is the outer diameter of the lens in the y direction.
Each lens 1 in the first sub-pixel area P1 has a width in the x direction that is the same as the short side width of the first sub-pixel area P1, and a width in the y direction that divides the long side width of the first sub-pixel area P1 into three equal parts. The shape of each lens 1 in plan view is a rectangle with a length in the x direction of Wx/3 and a length in the y direction of Wy/3, with the four corners rounded into arcs. In particular, when Wx=Wy, the shape of each lens 1 in plan view may be a circle.
The planar shapes of the lenses 1 in the second sub-pixel region P2 and the third sub-pixel region P3 are also similar.

There is a gap in the diagonal direction of each lens 1 when viewed in a plan view. A planar portion F consisting of the upper surface 2a of the planarization layer 2 is formed in the diagonal gap of each lens 1. Each lens 1 covers the planarization layer 2 except for the planar portion F.

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.
2 and 3, 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 planarization layer 2 are made of the same material and have the same refractive index.

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-collecting 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, the hemispherical shape includes a hemispherical surface, a hemispherical surface whose 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.

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 and the flat portion F of each lens 1 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.

The operation of the organic EL display device 100 will be described, focusing on the operation of the color filter 10 .
4 and 5 are schematic diagrams for explaining the function of the color filter according to the first embodiment of the present invention. Fig. 5 is a schematic diagram for explaining the function of the color filter according to the first embodiment of the present invention.

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.

For example, depending on the numerical aperture of the lens 1, red light from the light-emitting element 5 driven by an R signal may leak and be emitted from the second sub-pixel area P2 or the third sub-pixel area P3. Such leaked red light is collected on the front side by the lens 1, and therefore does not cause a change in color in the unit pixel P.
In contrast, red light from the light-emitting element 5 driven by the R signal may pass through the second colored layer 32 and leak out from the second sub-pixel region P2. In this case, the leaked light emitted based on the R signal passes through the second colored layer 32, causing the green light component of the leaked light to leak to the outside. As a result, the green light component based on the R signal increases, causing a change in the color of the unit pixel P. Although it depends on the light-collecting performance of the lens 1, the leaked light is also likely to have a large inclination with respect to the optical axis O, so there is a risk that the change in color will increase, especially as the unit pixel P is viewed from an oblique direction.

FIG. 4 shows a schematic diagram of a light beam in a cross section perpendicular to the y direction.
When the light-emitting element 5 is turned on, a light beam L0Ax (see solid arrow) is emitted from point A where the lens 1 facing each light-emitting element 5 intersects with each optical axis O, expanding radially from the optical axis O toward the convex lens surface 1a facing in the z direction.
Since the planarization film 4, the filter portion 3, and the planarization layer 2 have no refractive power, each light beam L0Ax spreads inside and reaches the convex lens surface 1a that faces each light-emitting element 5 in the z direction. At each convex lens surface 1a, each light beam L0Ax is condensed according to its respective refractive power, and is emitted to the outside of the lens 1 as a light beam L1Ax that is nearly parallel.
Similarly, when light beam L0Bx (see dashed arrow) emitted from point Bx at the end of light-emitting element 5 in the x direction reaches convex lens surface 1a, it is condensed according to the refractive power of convex lens surface 1a and emitted as light beam L1Bx close to parallel light beam to the outside of lens 1. At this time, depending on the condensing performance of convex lens surface 1a, light beam L1Bx is emitted in an oblique direction according to the distance of point Bx from optical axis O, but compared to the case where convex lens surface 1a does not exist, light beam L1Bx is emitted in a direction approaching optical axis O according to the refractive power of convex lens surface 1a.
FIG. 4 shows an example in which light is emitted from a point Bx in the second colored layer 32, but similar light beams (not shown) are also emitted from the first colored layer 31 and the third colored layer 33.

For example, light from point Bx in the second colored layer 32 is also emitted in a direction toward the convex lens surface 1a facing the third colored layer 33 in the z direction, as light beam L0Dx indicated by a two-dot chain line. Most of the light beam L0Dx is transmitted through the second colored layer 32 and the third colored layer 33, and is therefore different from green light. However, since the transmission wavelength ranges of the second colored layer 32 and the third colored layer 33 are different, the amount of transmitted light is lower than that of the light beam L0Bx. The light beam L0Dx that reaches the convex lens surface 1a facing the third colored layer 33 in the z direction is emitted to the outside of the lens 1 as light beam L1Dx that is close to a parallel light beam traveling in an oblique direction toward the x direction.
However, since the light beams L0Bx and L0Dx are radiated from the outer edge of the light emitting element 5, the light quantity itself is lower than that at the center. Most of the light beam L1Dx is tinged with bluish by transmitting through the third colored layer 33, but since the light quantity is low, the effect of color mixing is small.

Although not shown for ease of viewing, the light beams emitted from point Cx at the end opposite the x direction of each light-emitting element 5 and emerging from the convex lens surface 1a become light beams symmetrical to the light beams L0Bx, L0Dx, L1Bx, and L0Dx with respect to the optical axis O.
The light beam emitted from the lens 1 in a cross section perpendicular to the y direction is centered on the optical axis O of the convex lens surface 1a facing each light-emitting element 5 in the z direction, and has a smaller spread angle than the light beam radiated from each light-emitting element 5. The color of the light beam emitted from each convex lens surface 1a corresponds to the transmission wavelength range of the filter section 3 that each convex lens surface 1a faces.

As a result, most of the white light from the light-emitting element 5 facing the first colored layer 31 passes through the first colored layer 31 and is emitted from the lens 1 facing the first colored layer 31 to the front of the lens 1 (the upper side in the figure) as red light having a red wavelength component.
Similarly, most of the white light from the light-emitting element 5 facing the second colored layer 32 passes through the second colored layer 32 and is emitted forward from the lens 1 facing the second colored layer 32 as green light having a green wavelength component.
Similarly, most of the white light from the light-emitting element 5 facing the third colored layer 33 passes through the third colored layer 33 and is emitted forward from the lens 1 facing the third colored layer 33 as blue light having a blue wavelength component.

FIG. 5 shows a schematic diagram of a light beam in a cross section that passes through a point A of the light emitting element 5 facing the second colored layer 32 and is perpendicular to the x direction.
For ease of comparison with Fig. 4, points A, By, and Cy are marked at positions similar to points A, Bx, and Cx in Fig. 4. Light beams L0Ay, L1Ay, L0By, L1By, L0Dy, and L1Dy are similar to light beams L0Ax, L1Ax, L0Bx, L1Bx, L0Dx, and L1Dx in Fig. 4, except that they are light beams emitted from points A and Bx.
The light beam emitted from lens 1 in a cross section perpendicular to the x-direction is centered on optical axis O of each convex lens surface 1a facing light-emitting element 5 in the z-direction, and has a smaller spread angle than the light beam emitted from light-emitting element 5. The color of the light beam emitted from each convex lens surface 1a corresponds to the transmission wavelength range of filter section 3 facing light-emitting element 5, that is, the transmission wavelength range of second colored layer 32 in the example of FIG.
5, for example, the light beams L0Dy and L1Dy are simply transmitted through the second colored layer 32, and are emitted as green light without a reduction in the amount of light. Therefore, the light beam L1Dy does not cause color mixing.

In this manner, since the lenses 1 of this embodiment are arranged in multiple locations above each sub-pixel that is long in the y direction, they have the effect of suppressing the spread of the light beam in the y direction, similar to the x direction, thereby improving the front luminance of the unit pixel P.
This point will be described in comparison with the comparative examples shown in FIGS.
Fig. 6 is a schematic plan view showing an example of a display device of a comparative example, and Fig. 7 is a cross-sectional view taken along line F7-F7 in Fig. 6.

As shown in Figures 6 and 7, the organic EL display device 110 of the comparative example is configured similarly to the organic EL display device 100, except that it has a lens 111 instead of the lens 1 of the organic EL display device 100. The following will mainly explain the differences from this embodiment.

As shown in Figure 7, the lenses 111 are arranged opposite each of the first colored layer 31, the second colored layer 32, and the third colored layer 33, with the planarization layer 2 in between, and focus the light passing through the first colored layer 31, the second colored layer 32, and the third colored layer 33, respectively.
As shown in FIG. 6, the lenses 111 are arranged in the longitudinal direction of each of the first sub-pixel area P1, the second sub-pixel area P2, and the third sub-pixel area P3.
The lens 111 in the first sub-pixel area P1 has a width in the x direction that is the same as the short side width of the first sub-pixel area P1, and a width in the y direction that is the same as the long side width of the first sub-pixel area P1. The lens 111 has a rectangular shape in plan view with four corners that are rounded into an arc shape.
The planar shapes of the lenses 111 in the second sub-pixel area P2 and the third sub-pixel area P3 are also similar.

The shape of each lens 111 in a cross section perpendicular to the y direction is similar to the shape of the convex lens surface 1a in the same cross section.
As shown in FIG. 7, the shape of each lens 111 in a cross section perpendicular to the x-direction is such that a flat surface 111b and a lens surface 111a are formed in this order in the z-direction.
The plane 111 b is formed by the boundary surface with the planarizing layer 2 .
The lens surface 111a has convex surfaces 111aB formed on both ends of the lens 111 in the longitudinal direction, and a cylindrical surface 111aA extending in the x-direction in a region sandwiched between the convex surfaces 11aB.
The cylindrical surface 111aA is formed by extending the shape of a cross section of the convex lens surface 1a perpendicular to the x-direction in the x-direction.
The convex surface 111aB is a quarter sphere that smoothly connects to the cylindrical surface 111aA.

Lens surface 111a has a refractive power similar to that of convex lens surface 1a in a cross section perpendicular to the y direction, but has no refractive power in a cross section perpendicular to the x direction except for convex surface 111aB.
Therefore, as indicated by the solid and dashed lines in FIG. 7, of the luminous flux emitted from the light emitting element 5, the luminous flux that passes through the cylindrical surface 111aA is emitted from the lens 111 without being condensed in the x direction.
As a result, compared to the present embodiment, the viewing angle in a cross section perpendicular to the y direction is wider in response to the spread of the light beam, but the luminance in each observation direction in the same cross section is lower than in the present embodiment.
That is, in the organic EL display device 110 of the comparative example, the front luminance is reduced, and the luminance according to the observation angle when viewed obliquely in a cross section perpendicular to the y direction is also reduced. As a result, the image becomes dark, and the visibility is reduced.

In contrast, the organic EL display device 100 of this embodiment has a color filter 10 in which multiple lenses 1 are arranged in the longitudinal direction of each subpixel, resulting in improved front luminance and visibility.

Second Embodiment
A color filter and a display device according to a second embodiment of the present invention will be described.
Fig. 8 is a schematic plan view showing an example of a display device according to a second embodiment of the present invention, and Fig. 9 is a cross-sectional view taken along line F9-F9 in Fig. 8.

8 and 9, an organic EL display device 100A (display device) of this embodiment includes a color filter 10A of this embodiment instead of the color filter 10 of the first embodiment. The color filter 10A includes a filter portion 3A instead of the filter portion 3.
The following description will focus on the differences from the first embodiment.

The filter section 3A further includes a light-shielding wall 7A that blocks visible light in the filter section 3A.
The light blocking walls 7A are disposed between sub-pixels adjacent in the x direction in unit pixels P adjacent in the x direction, and between sub-pixels adjacent to each other in the x direction within unit pixels P.
The shape of the light-shielding wall 7A is not particularly limited as long as it can block at least a part of the light passing across adjacent sub-pixels in the x direction.
8 and 9, the x-width of each light-shielding wall 7A is t, and the y-length is Wy. The z-height of each light-shielding wall 7A is equal to the thickness of each subpixel. The upper surface 7a of the light-shielding wall 7A is located on the same plane as the upper surface 3a of the filter portion 3A.
The width x, t, of the light-shielding wall 7A is set to an appropriate value that provides the necessary light-shielding characteristics. However, it is preferable that t is small. For example, t may be 30% to 40% of Wx/3.
The material of the light-shielding wall 7A is not particularly limited as long as it can block visible light. For example, a material having a visible light transmittance of 0% or more and 20% or less may be used as the material of the light-shielding wall 7A. The light-shielding wall 7A may be formed of a resin material in which a black coloring material such as carbon is dispersed.

The first colored layer 31, the second colored layer 32, and the third colored layer 33 in this embodiment are the same as the subpixels in the first embodiment, except that the x width is wx. The size of wx is (Wx/3-t). Therefore, the aspect ratio of each subpixel in this embodiment is Wy/wx.
For example, when Wy=Wx, the aspect ratio is greater than 3. In particular, when the width t of the light-shielding wall 7A is within the above-mentioned range, the aspect ratio is 4.2 or more and 5 or less.

The filter portion 3A can be manufactured by preparing a resin composition that forms the light-shielding wall 7A and patterning it using a photolithography method similar to the method for forming the first colored layer 31, the second colored layer 32, and the third colored layer 33.

The organic EL display device 100A of this embodiment has a color filter 10A in which a plurality of lenses 1 are arranged in the longitudinal direction of each subpixel, and therefore has good front luminance and visibility, similar to the first embodiment.
In particular, the filter portion 3A in the color filter 10A has the light shielding walls 7A between the sub-pixels, and therefore can block the light beam emerging from the lens 1 via the boundaries between the sub-pixels.
For example, as shown in FIG. 9, consider light rays R1, R2, and R3 that are incident on the first colored layer 31 and travel in the x direction and then travel in the z direction.
The light rays R1 and R2 emitted from the end of the light-emitting element 5 on the opposite side to the x-direction pass through the planarization layer 2 above the light-shielding wall 7A in the figure and are emitted to the outside from the lens 1 facing the second colored layer 32. On the other hand, light incident at a position further in the x-direction than the light ray R2 is absorbed by the light-shielding wall 7A, for example, like the light ray R3, and is not emitted to the outside.
Therefore, the change in color tone due to color mixing can be suppressed more than in the first embodiment.

[First Modification]
A color filter and a display device according to a first modified example of the second embodiment of the present invention will be described.
10 is a schematic plan view showing an example of a display device according to a first modified example of the second embodiment of the present invention, and FIG. 11 is a cross-sectional view taken along line F11-F11 in FIG.

10, an organic EL display device 100B (display device) of this modification includes a color filter 10B of this embodiment instead of the color filter 10A of the second embodiment. The color filter 10B includes a filter portion 3B instead of the filter portion 3A.
The following description will focus on the differences from the second embodiment.

The filter unit 3B includes a light-shielding wall 7B instead of the light-shielding wall 7A in the filter unit 3A.
The light-shielding wall 7B is formed in a columnar shape extending in the z direction, and an upper surface 7aB in the extending direction (see FIG. 11) is provided at a position facing each of the flat portions F.
For this reason, the light-shielding walls 7B are arranged in a lattice pattern spaced apart from each other in the x and y directions, between sub-pixels adjacent to each other in the x direction in unit pixels P adjacent to each other in the x direction, and between sub-pixels adjacent to each other in the x direction within a unit pixel P.
The shape of the light-shielding wall 7B is not particularly limited as long as it can block at least a part of the light traveling from the light-emitting element 5 toward the flat surface portion F.
10 and 11, the x-width of each light-shielding wall 7B is tx, and the y-width is ty. The height of each light-shielding wall 7B in the z-direction is equal to the thickness of each subpixel. The upper surface 7aB of the light-shielding wall 7B is located on the same plane as the upper surface 3a of the filter portion 3B.
The x-widths tx and ty of the light-shielding wall 7B are appropriately set to a size that provides the necessary light-shielding characteristics. For example, tx and ty may be a size that can cover 70% to 100% of the flat surface portion F in a plan view.
The light shielding wall 7B is made of the same material as that of the light shielding wall 7A.

The first colored layer 31, the second colored layer 32, and the third colored layer 33 in this embodiment are similar to each subpixel in the first embodiment, except that the x-width wF of the portion sandwiched between the light-shielding walls 7B facing each other in the x-direction is reduced to (Wx/3-tx).
In the present embodiment, when the shape of the subpixel is not rectangular, the aspect ratio is defined as the ratio of the maximum length in the long direction to the maximum length in the short direction of the subpixel, and therefore the aspect ratio of each subpixel in this embodiment is the same as that in the first embodiment.

Color filter 10B can be manufactured in the same manner as color filter 10A of the second embodiment, except that the formation area of light-shielding wall 7B in a plan view is different from that of light-shielding wall 7A.

According to the organic EL display device 100B of this embodiment, since it has a color filter 10B in which a plurality of lenses 1 are arranged in the longitudinal direction of each subpixel, similarly to the first embodiment, the front luminance and visibility are improved.
In particular, the filter portion 3B in the color filter 10B has the light shielding walls 7B between the sub-pixels, and therefore can shield a part of the light beam emerging from the flat portion F via the boundaries between the sub-pixels.
For example, as shown in FIG. 11, consider light rays R4 and R5 that are incident on the first colored layer 31 and travel in the x direction and then travel in the z direction.
A light ray R4 emitted from the end of the light emitting element 5 on the opposite side to the x direction passes through the planarization layer 2 above the light shielding wall 7B in the figure and is emitted from the flat portion F to the outside.
On the other hand, the light ray R5 emitted from the end portion in the x direction of the light emitting element 5 is absorbed by the light blocking wall 7B and is not emitted to the outside.
When light leaks from the flat surface F, it is not condensed by the lens 1 and is emitted in a direction that is greatly inclined with respect to the optical axis O. This causes a change in color when the unit pixel P is viewed from an oblique direction.
According to this modification, the leakage of light from the flat surface portion F can be reduced, so that the change in color tone due to color mixing can be suppressed more than in the first embodiment.

[Second Modification]
A color filter and a display device according to a second modification of the second embodiment of the present invention will be described.
FIG. 12 is a schematic plan view showing an example of a display device according to a second modified example of the second embodiment of the present invention.

12, an organic EL display device 100C (display device) of this modification includes a color filter 10C of this embodiment instead of the color filter 10A of the second embodiment. The color filter 10C includes a filter portion 3C instead of the filter portion 3A.
The following description will focus on the differences from the second embodiment.

The filter unit 3C includes a light-shielding wall 7C instead of the light-shielding wall 7A in the filter unit 3A.
The light-shielding wall 7C is similar to the light-shielding wall 7A of the second embodiment, except that the height hC from the flat surface 4a to the upper surface 7aC is smaller than the thickness of each sub-pixel.
The size of hC can be set to an appropriate size according to the required light blocking range. For example, hC is more preferably larger than half the thickness of each sub-pixel.

The color filter 10C can be manufactured in the same manner as the color filter 10A in the second embodiment, except that the height of the light-shielding wall 7C is different from that of the light-shielding wall 7A. However, in this modification, after the light-shielding wall 7C is formed, the first colored layer 31, the second colored layer 32, and the third colored layer 33 are formed.

The organic EL display device 100C of this embodiment has the same functions as the second embodiment, except that the light blocking range of the light blocking wall 7C is narrower than that of the second embodiment.
12, when the light ray R6 passes through the boundary between the first colored layer 31 and the second colored layer 32 above the light-shielding wall 7C in the figure, the light ray R6 is not blocked by the light-shielding wall 7C. Therefore, the light ray R6 passes through the planarizing layer 2 and is emitted to the outside from the lens 1 facing the second colored layer 32.
However, when the height hC of the light-shielding wall 7C is equal to or greater than half the thickness of the subpixel and the inclination of the light ray R6 with respect to the optical axis O is, for example, 45° or less, the length of the path through which the light ray R6 passes through the second colored layer 32 is shorter than the length of the optical path through which the light ray R6 passes through the first colored layer 31. In this case, since the light ray R6 is reddish, the change in color due to color mixing is smaller than when the light ray R6 is converted into green light.

[Third Modification]
A color filter and a display device according to a third modified example of the second embodiment of the present invention will be described.
FIG. 13 is a schematic plan view showing an example of a display device according to a third modified example of the second embodiment of the present invention.

13, an organic EL display device 100D (display device) of this modification includes a color filter 10D of this embodiment instead of the color filter 10A of the second embodiment. The color filter 10D includes a planarization layer 2C and a filter portion 3D instead of the planarization layer 2 and the filter portion 3A.
The following description will focus on the differences from the second embodiment.

In this modification, the light-shielding wall 7A in the second embodiment is extended to the inside of the planarizing layer 2.
The filter unit 3D includes a light-shielding wall 7D instead of the light-shielding wall 7A in the filter unit 3A.
The light-shielding wall 7D is similar to the light-shielding wall 7A of the second embodiment, except that the height hD from the flat surface 4a to the upper surface 7aD is greater than the thickness of each subpixel and is less than the sum of the thickness of each subpixel and the thickness of the planarization layer 2C.
The planarization layer 2C is similar to the planarization layer 2 of the second embodiment, except that a light-shielding wall 7D extends inside.

The color filter 10D can be manufactured in the same manner as the filter portion 3A of the second embodiment, except that the height of the light-shielding wall 7D is different from that of the light-shielding wall 7A.

The organic EL display device 100D of this embodiment has the same functions as the second embodiment, except that the light blocking range provided by the light blocking wall 7C is wider than that of the second embodiment.
According to this modified example, in addition to being able to block light rays that cross the boundary surface between adjacent sub-pixels, such as light ray R3, it is also possible to block at least a portion of the light that passes through the planarization layer 2C and exits from the lens 1 facing the adjacent sub-pixel.
For example, by appropriately setting the size of hD so that light ray R7, which corresponds to light ray R1 shown in Figure 9, can also be blocked, it is possible to block all light that passes through the first colored layer 31 and is emitted to the outside from the convex lens surface 1a facing the adjacent sub-pixel.

[Fourth Modification]
A color filter and a display device according to a fourth modified example of the second embodiment of the present invention will be described.
FIG. 14 is a schematic plan view showing an example of a display device according to a fourth modified example of the second embodiment of the present invention.

14, an organic EL display device 100E (display device) of this modification includes a color filter 10E of this embodiment instead of the color filter 10A of the second embodiment. The color filter 10E includes a planarization layer 2E and a filter portion 3 instead of the planarization layer 2 and the filter portion 3A. The filter portion 3 is a layer portion similar to that of the first embodiment, and is not provided with a light-shielding wall.
The following description will focus on the differences from the second embodiment.

The planarization layer 2E is similar to the planarization layer 2 of the second embodiment, except that a light-shielding wall 7E is formed inside.
The light-shielding walls 7E extend from the upper surface 3a on the boundaries of the sub-pixels into the inside of the planarizing layer 2E.

The color filter 10E can be manufactured by forming the filter portion 3 in the same manner as in the first embodiment, and then forming a light-shielding wall 7E on the upper surface 3a, and forming a planarizing layer 2E and a lens 1 on the upper surface 3a and the light-shielding wall 7E in the same manner as in the second embodiment.

The organic EL display device 100E of this embodiment has the same function as that of the second embodiment, except that the light-shielding wall 7E blocks light that passes through a part of the planarizing layer 2E.
According to this modification, for example, light such as rays R8 and R9 that passes above the boundary between sub-pixels and exits from convex lens surface 1a facing adjacent sub-pixels in the x direction can be blocked.
According to this modification, the light-shielding wall 7E is formed separately after the filter portion 3 is formed, so that the filter portion 3 can be manufactured more easily than in the case where the light-shielding wall 7E is formed at the same time.

[Third embodiment]
A color filter and a display device according to a third embodiment of the present invention will be described.
Fig. 15 is a schematic plan view showing an example of a display device according to a third embodiment of the present invention. Fig. 16 is a cross-sectional view taken along line F15-F15 in Fig. 15. Fig. 17 is a cross-sectional view taken along line F16-F16 in Fig. 15.

An organic EL display device 100F (display device) of this embodiment shown in Fig. 15 includes unit pixels P10 each having a rectangular shape in a plan 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 100F is not particularly limited. For example, like the organic EL display device 100, the organic EL display device 100F can be used as a display device for electronic devices such as smart glasses, a head-mounted display, and an electronic viewfinder.
The following description will focus on the differences from the first embodiment.

The unit pixel P10 has an x-width Wx and a y-width Wy. In particular, when 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.

The first sub-pixel region P11 has a rectangular shape with an x-width of Wx/2 and a y-width of Wy/2 in plan view. The first sub-pixel region P11 displays, for example, red.
The second sub-pixel region P12 is a rectangle having an x-width of Wx/2 and a y-width of Wy/2 in a plan view. The second sub-pixel region P12 displays, for example, green.
The third sub-pixel region P13 is an elongated rectangle with an x-width of Wx/2 and a y-width of Wy in a plan view. The third sub-pixel region P13 displays, for example, blue.

As shown in FIG. 16, the organic EL display device 100F has a main body 19 and a color filter 10F.

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. 16, 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 region P11 and the second sub-pixel region 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.

The color filter 10F has a filter portion 13 instead of the filter portion 3 of the color filter 10 in the first embodiment.

In place of the first colored layer 31, the second colored layer 32, and the third colored layer 33 of the filter section 3, the filter section 13 has a first colored layer 41 (subpixel, second subpixel), a second colored layer 42 (subpixel, second subpixel), and a third colored layer 43 (subpixel, elongated pixel, first subpixel).

The first colored layer 41 is overlaid on the first sub-pixel region P11. The first colored layer 41 forms a sub-pixel having a transmission wavelength range of, for example, red.
15, 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 subpixel region P12. The second colored layer 42 forms a subpixel having, 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/2 and a y-width of Wy/2.

The third colored layer 43 is overlaid on the third subpixel region P13. The third colored layer 33 forms a subpixel having a transmission wavelength range of, for example, blue.
The first colored layer 41 and the second colored layer 42 are adjacent to one longitudinal side of the third colored layer 43. The planar shape of the third colored layer 43 is a rectangle elongated in the y direction with an x-width of Wx/2 and a y-width of Wy. Therefore, the aspect ratio of the third colored layer 43 is 2×Wy/Wx, which is greater than 1. Therefore, the third colored layer 43 is an elongated pixel. For example, when the unit pixel P is a square (Wx=Wy), the aspect ratio of the third colored layer 43 is 2.
In contrast, the aspect ratios of the first colored layer 41 and the second colored layer 42 adjacent to the third colored layer 43 are half the aspect ratio of the third colored layer 43 and are smaller than the aspect ratio of the third colored layer 43 .

Thus, the first colored layer 41 and the second colored layer 42 respectively form the first and second subpixels among the three subpixels in the filter portion 13. The first and second subpixels are rectangular subpixels having first and second transmission wavelength ranges for two of the colors red, green, and blue.
The third colored layer 43 forms a third subpixel. The third subpixel is an elongated pixel having an aspect ratio larger than the aspect ratios of the first and second subpixels, and has a third wavelength range among red, green, and blue colors that is different from the first transmission wavelength range and the second wavelength range.

Filter section 13 is formed in the same manner as filter section 3, except that the planar shape and arrangement of the subpixels are different.

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 43, respectively, with the planarizing layer 2 interposed therebetween. In particular, the two lenses 1 facing the third colored layer 43 are disposed side by side in the y direction, which is the longitudinal direction of the third colored layer 43.
Although there may be a gap between the adjacent lenses 1, in this embodiment, the lenses 1 are closely arranged so that parts of their outer edges are in contact with each other, as in the first embodiment.
A flat surface portion F similar to that of the first embodiment is formed in the diagonal direction of each lens 1 .

The color filter 10F of this embodiment is an example in which two lenses are arranged to face elongated pixels.
The organic EL display device 100F of this embodiment has a color filter 10F in which a plurality of lenses 1 are arranged in the longitudinal direction of the third colored layer 43, and therefore has good front luminance and visibility, similar to the first embodiment.

In the above-described embodiments and modified examples, the aspect ratio of the elongated pixels is equal to or close to 3 or 2. However, the aspect ratio of the elongated pixels is not particularly limited as long as it is greater than 1.
The number of lenses facing the elongated pixels is not particularly limited as long as they can be densely arranged in the longitudinal direction of the elongated pixels. However, when the aspect ratio of the elongated pixels is 1.5 or more, it is more preferable to set the number of lenses to a number obtained by rounding off the aspect ratio to the first decimal place. In this case, the ratio of the length of the long axis direction to the length of the short axis direction of the lens in a plan view can be set to a value close to 1, making it easy to reduce the anisotropy of the light-collecting performance.

In the above embodiments and modified examples, the light-emitting element is an organic EL element. However, the type of light-emitting element is not limited to an organic EL element. For example, an example of a light-emitting element is an inorganic LED element.

In the above embodiments and modified examples, red, green, and blue subpixels are arranged in the first subpixel region, the second subpixel region, and the third subpixel region, respectively. However, the colors and arrangement positions of the subpixels are not limited to this, as long as a color display can be achieved in the unit pixel.

Examples 1 and 2 of the color filter and display device according to the first and third embodiments 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.

[Example 1]
Example 1 is an example corresponding to the first embodiment.
The size of the unit pixel P in Example 1 was Wx=Wy=9 (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 3 μm×9 μm, respectively.
As shown in Table 1, the x width x y width of the first colored layer 31 (subpixel R in Table 1), the second colored layer 32 (subpixel G in Table 1), and the third colored layer 33 (subpixel B in Table 1) were 3 μm x 9 μm, respectively.
Three lenses 1 were provided facing each sub-pixel. The x width and y width of each lens 1 were 3 μm×3 μm.

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.

To manufacture the filter portion 3, red, green, and blue photosensitive coloring compositions RR-1, GR-1, and BR-1 were prepared, each having the composition shown in Table 2 below.

In Table 2, "resin" is the binder, and "monomer" is the curing agent. The initiator is an additive that causes the curing agent to undergo a radical polymerization reaction. The chain transfer agent is an additive that promotes radical polymerization.

The red coloring material R-1 used in the photosensitive coloring composition RR-1 was prepared as follows.
After uniformly mixing the mixture MR having the following composition, the mixture MR 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, Irgarfor Red B-CF (trade name; manufactured by BASF) was used as C.I. Pigment Red 254. Paliotol (registered trademark) Yellow L 2146HD (trade name; manufactured by BASF) was used as C.I. Pigment Yellow 139.

(Composition of Mixture MR)
Red pigment: C.I. Pigment Red 254 78 parts by weight Yellow pigment: C.I. Pigment Yellow 139 22 parts by weight Acrylic varnish (solid content 20%) 215 parts by weight

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 (trade name; manufactured by DIC Corporation) was used as C. I. Pigment Green 58. Paliotol (registered trademark) Yellow L 1155 (trade name; manufactured by BASF Corporation) was used as C. I. Pigment Yellow 185.

(Composition of Mixture MG)
Green pigment: C.I. Pigment Green 58 65 parts by weight Yellow pigment: C.I. Pigment Yellow 185 35 parts by weight Acrylic varnish (solid content 20%) 215 parts by weight

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 (trade name; manufactured by Toyo Color Co., Ltd.) was used as C.I. Pigment Blue 15:6. LIONOGEN (registered trademark) VIOLET RLUE ES (trade name; manufactured by Toyo Color Co., Ltd.) was used as C.I. Pigment Violet 23.

(Composition of Mixture MB)
Blue pigment: C.I. Pigment Blue 15:6 63 parts by weight Purple pigment: C.I. Pigment Violet 23 37 parts by weight Acrylic varnish (solid content 20%) 215 parts by weight

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 including 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 example, the lens 1 and the flattening layer 2 were made of the photosensitive coloring compositions RR-1, GR-1, and BR-1, except for the coloring material, and the transparent materials were used by adding titanium oxide so that the refractive index was 1.6.

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, alkaline 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 x y width of each second colored layer 32 was 3 μm x 9 μm. Then, the provisionally formed second colored layer 32 was cured by heating at 80° C. for 10 minutes using a heating oven.

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 colored layer 31 in the first subpixel region P1.
Thereafter, a third colored layer 33 was formed in the same manner as in the formation of 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.

After forming the filter portion 3, the material for forming the lens 1 and the planarization layer 2 was applied onto the filter portion 3 with a spinner so that the film thickness of the cured finished product would be 3 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, thereby forming a transparent resin layer.
Thereafter, convex lenses 1 each having a height of 1.5 μm and a width in the x direction and y direction of 3 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.

Then, the surface of the lens 1 was attached to a cover glass 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.

[Example 2]
Example 2 is an example corresponding to the third embodiment.
The size of the unit pixel P10 in Example 2 was the same as that of the unit pixel P. The x width x y width of the first sub-pixel region P11 and the second sub-pixel region P12 were 4.5 μm x 4.5 μm, respectively. The x width x y width of the third sub-pixel region P13 was 4.5 μm x 9 μm.
As shown in Table 1, the x width by y width of the first colored layer 41 (subpixel R in Table 1) and the second colored layer 42 (subpixel G in Table 1) were 4.5 μm by 4.5 μm, respectively. The x width by y width of the third colored layer 43 (subpixel B in Table 1) was 4.5 μm by 9 μm.
One lens 1 was provided facing the first colored layer 41 and one lens 1 was provided facing the second colored layer 42. Two lenses 1 were provided facing the third colored layer 43. The x width x y width of each lens 1 was 4.5 μm x 4.5 μm.
The organic EL display device 100F of Example 2 was manufactured in the same manner as Example 1, except that the sizes and arrangements of the sub-pixels and the lenses 1 were different.

[Comparative Example 1]
Comparative Example 1 is an example of an organic EL display device 110 shown in FIGS.
As shown in Table 1, the organic EL display device 110 of Comparative Example 1 was similar to that of Example 1, except that the x width x y width of the lens 111 in plan view was 3 μm x 9 μm.

[Comparative Example 2]
As shown in Table 1, the organic EL display device of Comparative Example 2 was similar to Example 2, except that one lens having an x width and y width of 3 μm×9 μm was disposed facing the third colored layer 43.

[evaluation]
The visibility of Examples 1 and 2 and Comparative Examples 1 and 2 was evaluated.
In this evaluation, the organic EL display devices of Examples 1 and 2 and Comparative Examples 1 and 2 were lit in white light, observed from the front (z direction) and from an oblique direction, and the visibility was evaluated based on the brightness by visual observation.
Visibility when viewed from the front was judged based on whether the brightness of the screen was easy to see.
If the screen was easy to see, it was rated as good (represented as A in [Table 1]), and if the screen was dark and difficult to see, it was rated as bad (represented as B in [Table 1]).
The visibility from an oblique direction was judged based on the change in brightness when the observation angle was changed from 0° to 45° in a plane perpendicular to the x direction, with the front being 0°.
If the change in brightness was tolerable, it was rated as good (denoted as A in Table 1), and if the change in brightness was not tolerable, it was rated as bad (denoted as B in Table 1).

[Evaluation Results]
As shown in Table 1, the visibility in both the front and oblique directions was good in Examples 1 and 2. Therefore, the organic EL display devices of Examples 1 and 2 were excellent in visibility.
In Comparative Examples 1 and 2, the visibility in the front direction and the visibility in the oblique direction were both poor.
In Comparative Examples 1 and 2, the front luminance was lower and it was difficult to view compared to Examples 1 and 2. In addition, when observed from an oblique direction, the variation in brightness depending on the observation angle was larger compared to Examples 1 and 2.
This is believed to be because in Comparative Examples 1 and 2, the light-collecting performance in the y direction was reduced due to the placement of elongated lenses in the y direction.

Although the preferred embodiments and modifications of the present invention have been described above with reference to the examples, the present invention is not limited to the embodiments, modifications, 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.
For example, the light-shielding wall in the second embodiment and its modified example may be provided on the color filter in the third embodiment.

1 Lens 1a Convex lens surface 2, 2C, 2E Planarization layer 3, 3A, 3B, 3C, 3D, 13 Filter portion 4 Planarization film 5, 15, 15A, 15B Light emitting element 6 Substrate 7A, 7B, 7C, 7D, 7E Light shielding wall 9, 19 Main body portion 10, 10A, 10B, 10C, 10D, 10E, 10F Color filter 31 First colored layer (subpixel, elongated pixel)
32 Second colored layer (sub-pixel, elongated pixel)
33 Third colored layer (sub-pixel, elongated pixel)
41 First colored layer (subpixel, first subpixel)
42 Second colored layer (subpixel, second subpixel)
43 Third colored layer (subpixel, elongated pixel, third subpixel)
100, 100A, 100B, 100C, 100D, 100E, 100F Organic EL display device (display device)
F: Plane portion O: Optical axis P, P10: Unit pixel P1, P11: First sub-pixel area P2, P12: Second sub-pixel area P3, P13: Third sub-pixel area

Claims (8)

a plurality of sub-pixels having different transmission wavelength ranges in a region forming a unit pixel for color display;
a plurality of lenses arranged to face the plurality of sub-pixels, respectively, and configured to collect light passing through the plurality of sub-pixels;
Equipped with
At least one of the plurality of sub-pixels is an elongated pixel having a ratio of a length in a longitudinal direction to a length in a lateral direction greater than 1 when viewed from a thickness direction through which the light passes,
Among the plurality of lenses, two or more lenses that collect the light transmitted through the elongated pixel are arranged along the longitudinal direction.
Color filters. The ratio is equal to or greater than 1.5,
the number of lenses facing the elongated pixel is equal to the ratio rounded to the nearest tenth,
The color filter according to claim 1 . The plurality of lenses are densely arranged in the longitudinal direction.
The color filter according to claim 1 . the plurality of sub-pixels include three sub-pixels having different transmission wavelength ranges of red, green, and blue;
The three sub-pixels are all elongated pixels, are arranged in parallel in the short side direction, and have equal lengths in the long side direction.
The color filter according to any one of claims 1 to 3. The plurality of sub-pixels include
a first sub-pixel having a rectangular shape and a first transmission wavelength range of any one of red, green, and blue;
a second sub-pixel having a rectangular shape and having a second transmission wavelength range among the red, green, and blue colors that is different from the first transmission wavelength range;
a third sub-pixel, which is the elongated pixel in which the ratio is larger than a ratio of a longitudinal length to a lateral length in each of the first sub-pixel and the second sub-pixel, and which has a third transmission wavelength range among the red, green, and blue colors, which is different from the first transmission wavelength range and the second transmission wavelength range;
Contains
the first subpixel and the second subpixel are both adjacent to the third subpixel in the short-side direction of the third subpixel, and are arranged adjacent to each other in the long-side direction of the third subpixel.
The color filter according to any one of claims 1 to 3. The pixel further includes a light-shielding wall disposed at least one of between adjacent sub-pixels among the plurality of sub-pixels and on a boundary line between the adjacent sub-pixels.
The color filter according to any one of claims 1 to 5. The color filter according to any one of claims 1 to 6,
A plurality of light-emitting elements facing the plurality of sub-pixels, respectively;
A display device comprising: The light-emitting element is an organic electroluminescence (EL) element.
The display device according to claim 7.

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