JP2022011075A - Color filter and display device - Google Patents

Abstract

To provide a color filter in which front luminance and visibility are improved even when sub-pixels in a unit pixel region are long in one direction.SOLUTION: A color filter 10 comprises: a first colored layer 31, a second colored layer 32, and a third colored layer 33 having mutually different transmission wavelength bands in a region where unit pixels P of color display are formed; and a plurality of lenses 1 for condensing the lights passing through the first colored layer 31, second colored layer 32, and third colored layer 33 and arranged facing each other. The first colored layer 31, second colored layer 32, and third colored layer 33 are slender pixels, of which the ratio of longitudinal length to lateral length is larger than 1 as viewed from the thickness direction in which the lights pass through. Two or more of a lens 1, out of the plurality of lenses 1, that condenses lights passing through the slender pixels, are arranged along the longitudinal direction.SELECTED DRAWING: Figure 1

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 plurality of organic EL elements that generate white light are arranged in one pixel region for color display, and colored above each organic EL element. It is known that the filter and the lens are arranged respectively.
For example, in Patent Document 1, three organic EL elements that generate white light are arranged in one pixel region, and each color of red (R), green (G), and blue (B) is arranged on each of them. Disclosed is an organic EL display device provided with a coloring filter that transmits light and a lens arranged on each coloring filter.
For example, in Patent Document 2, a light emitting element including a concave organic layer that generates white light is arranged in one pixel region, and light of each color of R, G, and B is placed on each of the light emitting elements. A display device provided with a transmissive coloring filter and a lens arranged on each coloring filter is disclosed.

Japanese Unexamined Patent Publication No. 2014-2880 Japanese Unexamined Patent Publication No. 2019-133816

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, the front luminance is improved by condensing the light emitted from the square organic EL element and transmitted through the coloring filter. In Patent Document 1, three organic EL elements having the same light emitting region shape are arranged in a triangular shape in one pixel region, and a coloring filter is also arranged in the same manner. In addition, the plan view shape of the lens is circular. Therefore, in one pixel, the gap between the sub-pixels forming the display light of the wavelength components of R, G, and B is large. In such a configuration, if the resolution is increased, the sub-pixels become too small, which makes it difficult to manufacture a color filter, and there is a possibility that the resolution cannot be increased.
In Patent Document 2, light emitted from a concave organic layer is collected by an internal lens, transmitted through a coloring filter, and emitted to the outside through an on-chip microlens arranged on the outermost side. In such a configuration, the coloring 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, as a sub-pixel, it is conceivable to divide one pixel area into three in one direction. For example, it is conceivable to arrange the organic EL element, the coloring 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 an elongated rectangle whose length in the longitudinal direction is three times as long as the width in the lateral direction.
According to such a configuration, sub-pixels can be arranged without a gap in the pixel area, which is suitable for high resolution.
However, with a lens long in one direction, the anisotropy of the refractive power required in the longitudinal direction and the lateral direction becomes large, so that there is a problem that a minute lens having good light extraction efficiency cannot be manufactured. For example, since the radius of curvature in the longitudinal direction is too large compared to the radius of curvature in the lateral direction, the lens performance is close to that of a cylindrical lens, and the focusing performance in the longitudinal direction is deteriorated. As a result, there is a problem that the front luminance is lowered and the visibility when viewed obliquely in the longitudinal direction is likely to be lowered.

The present invention has been made in view of the above problems, and provides a color filter and a display device that improve front luminance and visibility even if the sub-pixels in the unit pixel region are long in one direction. The purpose is to provide.

In order to solve the above problems, the color filter according to the first aspect of the present invention comprises a plurality of sub-pixels having different transmission wavelength ranges from each other in a region forming a unit pixel of color display, and the plurality of sub-pixels. A plurality of lenses that are arranged to face each other and collect light transmitted through the plurality of sub-pixels, and at least one sub-pixel among the plurality of sub-pixels has a thickness through which the light is transmitted. When viewed from the vertical direction, it is an elongated pixel in which the ratio of the length in the longitudinal direction to the length in the lateral direction is larger than 1, and among the plurality of lenses, a lens that collects the light transmitted through the elongated pixel. Are arranged in two or more along the longitudinal direction.

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

In the color filter, the plurality of lenses may be closely arranged in the longitudinal direction.

In the color filter, the plurality of sub-pixels include three sub-pixels having different transmission wavelength ranges of red, green, and blue, and the three sub-pixels are all elongated pixels. Therefore, they may be arranged in parallel in the lateral direction, and the lengths in the longitudinal direction may be equal to each other.

In the color filter, the plurality of sub-pixels are a first sub-pixel having a first transmission wavelength range of red, green, and blue, and a rectangular shape, the red, the said. The length in the lateral direction in each of the second sub-pixel having a second transmission wavelength range different from the first transmission wavelength range of green and the blue, and the ratio of the first sub-pixel and the second sub-pixel. A third transmission wavelength range different from the first transmission wavelength range and the second transmission wavelength range of the red, the green, and the blue color of the elongated pixel larger than the ratio of the length in the longitudinal direction with respect to the above. The first sub-pixel and the second sub-pixel are adjacent to the third sub-pixel in the lateral direction of the third sub-pixel, and the third sub-pixel is included. The third sub-pixel may be arranged adjacent to each other in the longitudinal direction.

The color filter may further include a light-shielding wall arranged between the sub-pixels adjacent to each other among the plurality of sub-pixels and at least one of the sub-pixels adjacent to each other on the boundary line.

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

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

According to the color filter and the display device of the present invention, the front luminance and the visibility are improved even if the sub-pixel in the unit pixel region is long in one direction.

It is a schematic plan view which shows an example of the display device which concerns on 1st Embodiment of this invention. It is sectional drawing which follows the F2-F2 line in FIG. It is sectional drawing which follows the F3-F3 line in FIG. It is a schematic diagram explaining the operation of the color filter which concerns on 1st Embodiment of this invention. It is a schematic diagram explaining the operation of the color filter which concerns on 1st Embodiment of this invention. It is a schematic plan view which shows an example of the display device of the comparative example. 6 is a cross-sectional view taken along the line F7-F7 in FIG. It is a schematic plan view which shows an example of the display device which concerns on 2nd Embodiment of this invention. It is sectional drawing which follows the F9-F9 line in FIG. It is a schematic plan view which shows an example of the display device which concerns on 1st modification of 2nd Embodiment of this invention. 10 is a cross-sectional view taken along the line F11-F11 in FIG. It is a schematic sectional drawing which shows an example of the display device which concerns on the 2nd modification of the 2nd Embodiment of this invention. It is a schematic sectional drawing which shows an example of the display device which concerns on the 3rd modification of the 2nd Embodiment of this invention. It is a schematic cross-sectional view which shows an example of the display device which concerns on 4th modification of 2nd Embodiment of this invention. It is a schematic plan view which shows an example of the display device which concerns on 3rd Embodiment of this invention. It is sectional drawing which follows the F15-F15 line in FIG. FIG. 15 is a cross-sectional view taken along the line F16-F16 in FIG.

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 members are designated by the same reference numerals, and common description will be omitted.

[First Embodiment]
The color filter and the display device according to the 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 the first embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line F2-F2 in FIG. FIG. 3 is a cross-sectional view taken along the line F3-F3 in FIG.

The organic EL display device 100 (display device) shown in FIG. 1 displays a color image based on an image signal. The application 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.
FIG. 1 shows the configuration of a unit pixel P in a plan view of the organic EL display device 100 of the present embodiment. Here, the plan view means viewing from the display screen of the organic EL display device 100 toward the light emitting element. The plan view is also viewed from the thickness direction of the filter unit 3 described later.

The unit pixel P is the smallest area for color display. For example, in the organic EL display device 100, a large number of unit pixels P shown in FIG. 1 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. There is. The z-direction is a direction orthogonal to the x-direction and the y-direction, which is a direction from the back to the front of the illustrated paper. The z direction is the direction opposite to the direction in the plan view.
The outer shape of the display screen formed by the entire unit pixel P of the organic EL display device 100 is a rectangle having sides in the x-direction and the y-direction. 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.
Hereinafter, for the sake of simplicity, the width in the x direction of a region, a member, etc. may be referred to as an x width, and the width in the y direction may be referred to as a y width.
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.
Since the configuration of each unit pixel P in the organic EL display device 100 is the same, an example of a single unit pixel P will be described below.

The first sub-pixel area 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 area P1 displays, for example, red.
The second sub-pixel area 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 area P2 displays, for example, green.
The third sub-pixel area P3 is a rectangle having 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.

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

The main body 9 has a substrate 6, a light emitting element 5, and a flattening film 4.
The plan view 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, as the light emitting element 5, an organic EL element may be used. The organic EL element applies a DC voltage between the anode and the cathode, injects electrons and holes into the light emitting layer, and recombines them to generate excitons, and the light when these excitons are deactivated. It emits light by utilizing the emission of.
The light emitting element 5 is provided in the first sub-pixel area P1, the second sub-pixel area P2, and the third sub-pixel area P3, respectively.
As shown in FIG. 1, the plan-view shape of each light emitting element 5 is slightly smaller than the outer shape of the first sub-pixel area P1, the second sub-pixel area P2, and the third sub-pixel area P3 in which each is arranged. It has a rectangular shape.
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 device 5 is manufactured on a silicon substrate using, for example, a semiconductor manufacturing process.

The electrodes in each light emitting element 5 are connected to a drive circuit (not shown) through wiring formed on the substrate 6. The drive circuit controls lighting and extinguishing of each light emitting element 5 based on the image signal.

As shown in FIG. 2, the flattening 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 extending over the entire display area of the organic EL display device 100.
The flattening film 4 protects the light emitting element 5 by covering the light emitting element 5. For example, the flattening film 4 suppresses deterioration of the light emitting element 5 by preventing moisture, oxygen, and the like from coming into contact with the light emitting element 5.
The material of the flattening film 4 is a transparent resin material having a good transmittance for visible light. As the material of the flattening film 4, it is more preferable to use a material having a high barrier property against at least one of moisture and oxygen.
The film thickness on the light emitting element 5 in the flattening film 4 is, for example, 0.1 μm.

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

The filter portion 3 is a layered portion having a constant thickness having 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 unit 3 may be 1.2 μm.
The filter portion 3 covers the flattening film 4 with the lower surface 3b in close contact with the flat surface 4a.
The filter unit 3 regulates the transmission wavelength of the light incident from each light emitting element 5 via the flattening film 4.

The filter unit 3 includes a first colored layer 31 (sub-pixels, elongated pixels), a second colored layer 32 (sub-pixels, elongated pixels), and a third colored layer 33 (sub-pixels, elongated pixels).
The first colored layer 31 is overlapped with the first sub-pixel area P1. The first colored layer 31 forms, for example, sub-pixels having a red transmission wavelength range.
The second colored layer 32 is arranged adjacent to each other in the x direction of the first colored layer 31. The second colored layer 32 is overlapped with the second sub-pixel area P2. The second colored layer 32 forms, for example, sub-pixels having a green transmission wavelength range.
The third colored layer 33 is arranged adjacent to each other in the x direction of the second colored layer 32. The third colored layer 33 is superimposed on the third sub-pixel area P3. The third colored layer 33 forms, for example, sub-pixels having a blue transmission wavelength range.

In the present embodiment, each of the first colored layer 31, the second colored layer 32, and the third colored layer 33 viewed from the thickness direction is a rectangular shape elongated in the y direction, and each is a first sub-pixel area. It has the same shape as P1, the second sub-pixel area P2, and the third sub-pixel area P3. Therefore, the first colored layer 31, the second colored layer 32, and the third colored layer 33 forming 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 in the longitudinal direction to the length in the lateral direction in the rectangle is called the aspect ratio. When the rectangle is a square, the aspect ratio is 1.
In the present embodiment, since the length of each sub-pixel in the lateral direction is Wx / 3 and the length in the longitudinal direction is Wy, the aspect ratio of each sub-pixel is 3 × Wy / Wx. In particular, when the unit pixel P is a square (Wx = Wy), the aspect ratio of each sub-pixel is 3.
When a sub-pixel having an aspect ratio of more than 1 is particularly referred to as an elongated pixel, in the present embodiment, the first colored layer 31, the second colored layer 32, and the third colored layer 33 are all elongated pixels.

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

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

The lens 1 is arranged so as to face the thickness direction (z direction) of each of the first colored layer 31, the second colored layer 32, and the third colored layer 33 with the flattening layer 2 interposed therebetween. The light transmitted through the layer 31, the second colored layer 32, and the third colored layer 33 is condensed. The collected light is emitted to the outside of the color filter 10 around the optical axis of each lens 1 extending in the z direction.

As shown in FIG. 1, in the present embodiment, the 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. ing.
In the present embodiment, in each lens 1, a part of the outer edge in a plan view is arranged without a gap in the x-direction and the y-direction. Therefore, each lens 1 is densely arranged in each longitudinal direction of the first sub-pixel area P1, the second sub-pixel area P2, and the third sub-pixel area P3. Further, in the present embodiment, the first sub-pixel area P1, the second sub-pixel area P2, and the third sub-pixel area P3 are also densely arranged in each lateral direction.
However, a gap may be formed between the outer edges of each lens 1 as long as the required light extraction efficiency can be obtained. In order to improve the light extraction efficiency, it is more preferable that the lenses 1 are densely arranged. For example, a preferable dense arrangement is an arrangement 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, the width of the gap in the y direction is more preferably 0.20 × Dy or less, where the outer diameter of the lens in the y direction is Dy.
Each lens 1 in the first sub-pixel area P1 has the same width as the short width of the first sub-pixel area P1 in the x direction, and the width that divides the longitudinal width of the first sub-pixel area P1 into three equal parts in the y direction. Has. The plan view shape of each lens 1 has a shape in which the four corners of a rectangle having a length in the x direction of Wx / 3 and a length in the y direction of Wy / 3 are rounded in an arc shape. In particular, when Wx = Wy, the plan view shape of each lens 1 may be a circle.
The same applies to the plan-view shape of each lens 1 in the second sub-pixel area P2 and the third sub-pixel area P3.

There is a gap in the diagonal direction of each lens 1 in a plan view. A flat surface portion F composed of the upper surface 2a of the flattening layer 2 is formed in the diagonal gap of each lens 1. Each lens 1 covers the flattening layer 2 except for the flat surface portion F.

The material of the lens 1 is a transparent resin material having a good transmittance with respect to visible light. The material of the lens 1 may be the same material as that of the flattening layer 2, or may be a different material. When the material of the lens 1 is different from the material of the flattening layer 2, the refractive indexes may be different from each other.
In the examples shown in FIGS. 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 flattening layer 2. However, when the lens 1 and the flattening layer 2 are made of the same material, an interface is not formed between the lens 1 and the flattening layer 2, so that the plane 1b is a virtual surface. When the refractive index of the lens 1 and the flattening layer 2 is the same, even if the plane 1b is formed, the plane 1b does not function as a refracting surface and a reflecting surface.
Hereinafter, unless otherwise specified, the case where the lens 1 and the flattening layer 2 are made of the same material and the refractive indexes of the lens 1 and the flattening layer 2 are equal to each other will be described.

Each lens 1 is a convex lens in which the convex lens surface 1a has a positive refractive power.
As the shape of each convex lens surface 1a, an appropriate shape is used in consideration of the light collection performance and the 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 hemisphere includes a case of a hemisphere, a case of a spherical surface having a ball chipping height smaller than a radius, and a case of these hemispherical surfaces and an aspherical surface close to the spherical surface.
By having such a shape, each lens 1 can collect the synchrotron radiation emitted by the light emitting element 5. The optical axis O of each lens 1 passes through the center of each 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 width) of each light emitting element 5 in the x direction.

The organic EL display device 100 uses a semiconductor manufacturing process to form a light emitting element 5 on a substrate 6, laminates a flattening film 4 on the substrate 6 and the light emitting element 5 to form a main body portion 9, and forms a main body 9 on a flat surface 4a. It can be manufactured by forming the filter unit 3, the flattening layer 2, and the lens 1.
For example, the filter unit 3 prepares a resin composition in which the coloring materials forming the first colored layer 31, the second colored layer 32, and the third colored layer 33 are dispersed in a photosensitive resin, respectively, via a pattern mask. It can be formed by forming a cured layer of each resin composition on a flat surface 4a by a photolithography method of exposure and development.
For example, in the lens 1, after forming the flattening layer 2 and the resin layer forming the lens 1 on the filter portion 3, the convex lens surface 1a of each lens 1 and the flat surface portion F are formed on the surface of the resin layer by an etch back method. It can be formed by forming the shape of. The flattening layer 2 is formed by the non-etched layered portion of the resin layer.

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 views illustrating the operation of the color filter according to the first embodiment of the present invention. FIG. 5 is a schematic diagram illustrating the operation of the color filter according to the first embodiment of the present invention.

In the organic EL display device 100, the light emitting element 5 facing the first colored layer 31 is controlled to emit light based on an image signal (hereinafter, R signal) of a red component. Similarly, the light emitting element 5 facing the second colored layer 32 has a green component image signal (hereinafter, G signal), and the light emitting element 5 facing the third colored layer 33 has a blue component image signal (hereinafter, B signal). ), The light emission is controlled respectively.
In the unit pixel P, the light from the light emitting element 5 driven by the R signal passes through the first colored layer 31 and is emitted to the outside, and the light from the light emitting element 5 driven by the G signal is transmitted to the second colored layer 31. The light from the light emitting element 5 driven by the B signal is transmitted to the outside through the third colored layer 33 and is emitted to the outside through the 32 to display the 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 the R signal may leak from the second sub-pixel area P2 or the third sub-pixel area P3 and be emitted. Since the leaked light of such red light is focused on the front side by the lens 1, the tint of the unit pixel P does not change.
On the other hand, the red light from the light emitting element 5 driven by the R signal may pass through the second colored layer 32 and leak from the second sub-pixel area P2 to be emitted. In this case, the leaked light emitted based on the R signal passes through the second colored layer 32, so that the green light component of the leaked light leaks to the outside. As a result, the tint of the unit pixel P changes due to the increase in the green light component based on the R signal. Although it depends on the light collecting performance of the lens 1, the leakage light also tends to have a large inclination with respect to the optical axis O, so that the change in color may increase as the unit pixel P is viewed from an oblique direction.

FIG. 4 schematically shows a luminous flux in a cross section orthogonal to the y direction.
When the light emitting element 5 is turned on, the point A that intersects each optical axis O of the lens 1 facing each light emitting element 5 spreads radially around the optical axis O and becomes a convex lens surface 1a facing in the z direction. The toward light flux L0Ax (see the solid line arrow) is emitted.
Since the flattening film 4, the filter unit 3, and the flattening layer 2 have no refractive power, each light flux L0Ax reaches the convex lens surface 1a facing each light emitting element 5 in the z direction while spreading internally. On each convex lens surface 1a, each light flux L0Ax is focused according to the respective refractive power and is emitted to the outside of the lens 1 as a light flux L1Ax close to a parallel light beam.
Similarly, when the luminous flux L0Bx (see the broken line arrow) radiated from the point Bx at the end in the x direction of the light emitting element 5 reaches the convex lens surface 1a, it is focused according to the refractive power of the convex lens surface 1a and is parallel. The luminous flux L1Bx, which is close to the luminous flux, is emitted to the outside of the lens 1. At this time, the luminous flux L1Bx is emitted in an oblique direction according to the distance of the point Bx with respect to the optical axis O depending on the light-collecting performance of the convex lens surface 1a. It emits light in a direction approaching the optical axis O according to the refractive power.
FIG. 4 shows an example of emitting light from the point Bx in the second colored layer 32, but the same light flux (not shown) is also emitted from the first colored layer 31 and the third colored layer 33.

For example, the light from the point Bx in the second colored layer 32 is also emitted in the direction toward the convex lens surface 1a facing the third colored layer 33 in the z direction, like the luminous flux L0Dx shown by the alternate long and short dash line. Most of the luminous flux L0Dx is different from green light because it passes through the second colored layer 32 and the third colored layer 33. However, since the transmitted wavelength regions 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 luminous flux L0Bx. The luminous flux 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 a luminous flux L1Dx that is close to a parallel luminous flux toward the diagonal direction toward the x direction.
However, since the luminous fluxes L0Bx and L0Dx are radiated luminous fluxes from the outer edge of the light emitting element 5, the amount of light itself is lower than that of the central portion. Most of the luminous flux L1Dx becomes bluish by passing through the third colored layer 33, but since the amount of light is low, the influence of color mixing is small.

Although not shown for the sake of clarity, the luminous flux emitted from the point Cx at the end of each light emitting element 5 in the direction opposite to the x direction and emitted from the convex lens surface 1a is the luminous flux L0Bx, L0Dx, L1Bx with respect to the optical axis O. , The luminous flux is symmetric with L0Dx.
The luminous flux emitted from the lens 1 in the cross section orthogonal 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 wider angle than the emitted light flux from each light emitting element 5. It becomes a small luminous flux. The color of the luminous flux emitted from each convex lens surface 1a corresponds to the transmission wavelength region of the filter unit 3 with which each convex lens surface 1a faces.

Therefore, most of the white light from the light emitting element 5 facing the first colored layer 31 faces the first colored layer 31 as red light having a red wavelength component by passing through the first colored layer 31. The light is emitted from the lens 1 to the front (upper side in the drawing) of the lens 1.
Similarly, most of the white light from the light emitting element 5 facing the second colored layer 32 faces the second colored layer 32 as green light having a green wavelength component by passing through the second colored layer 32. The light is emitted from the lens 1 to the front of the lens 1.
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 faces the third colored layer 33 through blue light having a blue wavelength component. It emits light from the lens 1 to the front of the lens 1.

FIG. 5 schematically shows a luminous flux in a cross section that passes through the point A of the light emitting element 5 facing the second colored layer 32 and is orthogonal to the x direction.
The points A, By, and Cy are marked at the same positions as the points A, Bx, and Cx in FIG. 4 so as to be easily compared with FIG. The luminous fluxes L0Ay, L1Ay, L0By, L1By, L0Dy, and L1Dy are the same luminous fluxes as the luminous fluxes L0Ax, L1Ax, L0Bx, L1Bx, L0Dx, and L1Dx in FIG.
The luminous flux emitted from the lens 1 in the cross section orthogonal to the x direction is centered on the optical axis O of each convex lens surface 1a facing the light emitting element 5 in the z direction, and has a smaller spread angle than the emitted light flux from the light emitting element 5. It becomes a luminous flux. The color of the luminous flux emitted from each convex lens surface 1a corresponds to the transmission wavelength region of the filter unit 3 facing the light emitting element 5, and in the example of FIG. 4, the transmission wavelength region of the second colored layer 32.
In FIG. 5, for example, since the luminous fluxes L0Dy and L1Dy only pass through the second colored layer 32, they are emitted as green light without reducing the amount of light. Therefore, the luminous flux L1Dy does not cause color mixing.

As described above, since a plurality of lenses 1 of the present embodiment are arranged above each sub-pixel long in the y direction, there is an effect of suppressing the spread of the light flux in the y direction as in the x direction. Therefore, the front luminance in the unit pixel P is improved.
This point will be described in comparison with the comparative examples shown in FIGS. 6 and 7.
FIG. 6 is a schematic plan view showing an example of a display device of a comparative example. FIG. 7 is a cross-sectional view taken along the line F7-F7 in FIG.

As shown in FIGS. 6 and 7, the organic EL display device 110 of the comparative example is configured in the same manner as the organic EL display device 100 except that the organic EL display device 110 has a lens 111 instead of the lens 1 of the organic EL display device 100. Hereinafter, the points different from the present embodiment will be mainly described.

As shown in FIG. 7, the lens 111 is arranged so as to face each of the first colored layer 31, the second colored layer 32, and the third colored layer 33 with the flattening layer 2 interposed therebetween. The light transmitted through the 31, the second colored layer 32, and the third colored layer 33 is condensed.
As shown in FIG. 6, the lens 111 is arranged one by one 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 the same width as the short width of the first sub-pixel area P1 in the x direction, and has the same width as the longitudinal width of the first sub-pixel area P1 in the y direction. The plan view shape of the lens 111 has a shape in which the four corners of a rectangle are rounded into an arc shape.
The same applies to the plan-view shape of each lens 111 in the second sub-pixel area P2 and the third sub-pixel area P3.

The shape of each lens 111 in a cross section orthogonal to the y direction is the same as 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 the cross section orthogonal to the x direction is such that the plane 111b and the lens surface 111a are formed in this order in the z direction.
The plane 111b is formed by a boundary surface with the flattening layer 2.
The lens surface 111a has convex surfaces 111aB formed at both ends in the longitudinal direction of the lens 111, 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 the cross section of the convex lens surface 1a orthogonal to the x direction in the x direction.
The convex surface 111aB is a quadrilateral spherical surface that smoothly connects to the cylindrical surface 111aA.

The lens surface 111a has the same refractive power as the convex lens surface 1a in the cross section orthogonal to the y direction, but has no refractive power except for the convex surface 111aB in the cross section orthogonal to the x direction.
Therefore, as shown by the solid line and the broken line in FIG. 7, among the luminous fluxes emitted from the light emitting element 5, the luminous flux transmitted through the cylindrical surface 111aA is emitted from the lens 111 without being focused in the x direction.
As a result, as compared with the present embodiment, the viewing angle in the cross section orthogonal to the y direction is widened in response to the spread of the luminous flux, but the brightness in each observation direction in the same cross section is lower than that in the present embodiment.
That is, in the organic EL display device 110 of the comparative example, the front luminance is lowered, and the brightness corresponding to the observation angle when viewed from an oblique direction in the cross section orthogonal to the y direction is also lowered. As a result, the image becomes dark and the visibility is lowered.

On the other hand, since the organic EL display device 100 of the present embodiment has a color filter 10 in which a plurality of lenses 1 are arranged in the longitudinal direction of each sub-pixel, the front luminance and the visibility are improved.

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

As shown in FIGS. 8 and 9, the organic EL display device 100A (display device) of the present embodiment includes the color filter 10A of the present embodiment in place of the color filter 10 of the first embodiment. The color filter 10A includes a filter unit 3A instead of the filter unit 3.
Hereinafter, the points different from the first embodiment will be mainly described.

The filter unit 3A further includes a light-shielding wall 7A that shields visible light from the filter unit 3.
The light-shielding wall 7A is arranged between the sub-pixels adjacent to each other in the x-direction in the unit pixels P adjacent to each other in the x-direction and between the sub-pixels adjacent to each other in the x-direction within the unit pixel 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 transmitted over the sub-pixels adjacent to each other in the x-direction.
For example, in the examples shown in FIGS. 8 and 9, the x width of each light-shielding wall 7A is t, and the length in the y direction is Wy. The height of each shading wall 7A in the z direction is equal to the thickness of each sub-pixel. 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 x width t of the light-shielding wall 7A is set to an appropriate size to obtain the required light-shielding characteristics. However, it is more preferable that t is small. For example, t may be 30% or more and 40% or less 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, as the material of the light-shielding wall 7A, a material having a visible light transmittance of 0% or more and 20% or less may be used. The light-shielding wall 7A may be formed of, for example, a resin material in which a black color material such as carbon is dispersed.

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

The filter unit 3A prepares a resin composition for forming the light-shielding wall 7A, and by patterning by 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. Can be manufactured.

According to the organic EL display device 100A of the present embodiment, since the color filter 10A in which a plurality of lenses 1 are arranged in the longitudinal direction of each sub-pixel is provided, the front luminance, the visibility, and the visibility are the same as in the first embodiment. Becomes good.
In particular, since the filter unit 3A in the color filter 10A has a light-shielding wall 7A between the sub-pixels, the light flux emitted from the lens 1 can be light-shielded via the boundary 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 z direction as they travel in the x direction.
The light rays R1 and R2 emitted from the end of the light emitting element 5 on the opposite side of the x direction pass through the flattening layer 2 on the upper side of the light shielding wall 7A and face the second colored layer 32 to the outside. Emit. On the other hand, the light incident on the position in the x direction with respect to the light ray R2 is absorbed by the light shielding wall 7A like the light ray R3, and therefore does not emit to the outside.
Therefore, the change in color due to color mixing can be suppressed as compared with the first embodiment.

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

As shown in FIG. 10, the organic EL display device 100B (display device) of the present modification includes the color filter 10B of the present embodiment in place of the color filter 10A of the second embodiment. The color filter 10B includes a filter unit 3B instead of the filter unit 3A.
Hereinafter, the points different from the second embodiment will be mainly described.

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 the upper surface 7aB (see FIG. 11) in the extending direction is provided at a position facing each plane portion F.
Therefore, the light-shielding wall 7B is provided in the x-direction and between the sub-pixels adjacent to each other in the x-direction in the unit pixels P adjacent to each other in the x-direction and between the sub-pixels adjacent to each other in the x-direction within the unit pixel P. They are arranged in a grid pattern apart from each other in the y direction.
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 directed from the light emitting element 5 to the flat surface portion F.
For example, in the examples shown in FIGS. 10 and 11, the x width of each light-shielding wall 7B is tx, and the y width is ty. The height of each shading wall 7B in the z direction is equal to the thickness of each sub-pixel. 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 large enough to obtain the required light-shielding characteristics. For example, tx and ty may have a size capable of covering the flat surface portion F in a range of 70% or more and 100% or less in a plan view.
As the material of the light-shielding wall 7B, the same material as that of the light-shielding wall 7A is used.

In the first colored layer 31, the second colored layer 32, and the third colored layer 33 in the present embodiment, the x width wF of the portion sandwiched by the light-shielding wall 7B facing in the x direction is (Wx / 3-tx). It is the same as each sub-pixel of the first embodiment except that the width is reduced.
When the shape of the sub-pixel is different from the rectangle as in the present embodiment, the ratio of the maximum length in the longitudinal direction to the maximum length in the lateral direction of the sub-pixel is defined as the aspect ratio. Therefore, the aspect ratio of each sub-pixel in this embodiment is the same as that in the first embodiment.

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

According to the organic EL display device 100B of the present embodiment, since the color filter 10B in which a plurality of lenses 1 are arranged in the longitudinal direction of each sub-pixel is provided, the front luminance, the visibility, and the visibility are the same as in the first embodiment. Becomes good.
In particular, since the filter unit 3B in the color filter 10B has a light-shielding wall 7B between the sub-pixels, it is possible to block a part of the light flux emitted from the flat surface portion F via the boundary 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 z direction as they travel in the x direction.
The light ray R4 emitted from the end portion of the light emitting element 5 opposite to the x direction passes through the flattening layer 2 on the upper side of the light shielding wall 7B in the drawing and is emitted from the flat surface portion F to the outside.
On the other hand, the light ray R5 emitted from the end portion of the light emitting element 5 in the x direction is absorbed by the light-shielding wall 7B, so that it is not emitted to the outside.
When the leaked light from the flat surface portion F is generated, it is not collected by the lens 1, so that the leaked light is emitted in the direction in which the inclination with respect to the optical axis O is large. Therefore, the color tone changes when the unit pixel P is viewed from an oblique direction.
According to this modification, since the light leaking from the flat surface portion F can be reduced, the change in color due to the color mixing can be suppressed as compared with 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 modification of the second embodiment of the present invention.

As shown in FIG. 12, the organic EL display device 100C (display device) of the present modification includes the color filter 10C of the present embodiment in place of the color filter 10A of the second embodiment. The color filter 10C includes a filter unit 3C instead of the filter unit 3A.
Hereinafter, the points different from the second embodiment will be mainly described.

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 the same as 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 lower than the thickness of each sub-pixel.
The size of hC can be appropriately set according to the required light-shielding 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.

According to the organic EL display device 100C of the present embodiment, the same operation as that of the second embodiment is provided except that the light-shielding range by the light-shielding wall 7C is narrower than that of the second embodiment.
According to this modification, for example, as in the light ray R6 shown in FIG. 12, when the boundary between the first colored layer 31 and the second colored layer 32 is transmitted above the light-shielding wall 7C in the drawing, the light-shielding wall 7C is used. Not shaded. Therefore, the light ray R6 passes through the flattening 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 more than half the thickness of the sub-pixel and the inclination of the light ray R6 with respect to the optical axis O is 45 ° or less, the light ray R6 passes through the first colored layer 31. The length of the route passing through the second colored layer 32 is shorter than the length of the optical path. In this case, since the light ray R6 is reddish, the change in color due to the color mixing is small as compared with the case where the light ray R6 is converted into green light.

[Third modification example]
A color filter and a display device according to a third modification 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 modification of the second embodiment of the present invention.

As shown in FIG. 13, the organic EL display device 100D (display device) of the present modification includes the color filter 10D of the present embodiment in place of the color filter 10A of the second embodiment. The color filter 10D includes a flattening layer 2C and a filter unit 3D in place of the flattening layer 2 and the filter unit 3A.
Hereinafter, the points different from the second embodiment will be mainly described.

This modification is an example in which the light-shielding wall 7A in the second embodiment is extended to the inside of the flattening 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 has a second height hD from the flat surface 4a to the upper surface 7aD, except that the height hD is larger than the thickness of each sub-pixel and is less than or equal to the sum of the thickness of each sub-pixel and the thickness of the flattening layer 2C. It is the same as the light-shielding wall 7A of the embodiment.
The flattening layer 2C is the same as the flattening layer 2 of the second embodiment except that the light-shielding wall 7D extends inside.

The color filter 10D can be manufactured in the same manner as the filter unit 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.

According to the organic EL display device 100D of the present embodiment, the same operation as that of the second embodiment is provided except that the light-shielding range by the light-shielding wall 7C is wider than that of the second embodiment.
According to this modification, for example, in addition to being able to block light rays that cross the boundary surface of adjacent sub-pixels such as light rays R3, light emitted from the lens 1 that passes through the flattening layer 2C and faces the adjacent sub-pixels. At least part of the light can be shielded.
For example, if the magnitude of hD is appropriately set so that the light ray R7 corresponding to the light ray R1 shown in FIG. 9 can also be shielded from light, a convex lens surface that passes through the first colored layer 31 and faces adjacent sub-pixels. All the light emitted from 1a to the outside can be blocked.

[Fourth variant]
A color filter and a display device according to a fourth modification 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 modification of the second embodiment of the present invention.

As shown in FIG. 14, the organic EL display device 100E (display device) of the present modification includes the color filter 10E of the present embodiment in place of the color filter 10A of the second embodiment. The color filter 10E includes a flattening layer 2E and a filter unit 3 in place of the flattening layer 2 and the filter unit 3A. The filter portion 3 is a layered portion similar to that of the first embodiment, and is not provided with a light-shielding wall.
Hereinafter, the points different from the second embodiment will be mainly described.

The flattening layer 2E is the same as the flattening layer 2 of the second embodiment except that a light-shielding wall 7E is formed inside.
The light-shielding wall 7E extends from the upper surface 3a on the boundary of each sub-pixel to the inside of the flattening layer 2E.

In the color filter 10E, after the filter portion 3 is formed in the same manner as in the first embodiment, the light-shielding wall 7E is formed on the upper surface 3a and on the upper surface 3a and the light-shielding wall 7E in the same manner as in the second embodiment. , Can be manufactured by forming the flattening layer 2E and the lens 1.

According to the organic EL display device 100E of the present embodiment, the light-shielding wall 7E has the same operation as that of the second embodiment except that the light transmitted through a part of the flattening layer 2E is shielded from light.
According to this modification, light emitted from the convex lens surface 1a that passes above the boundary of each sub-pixel and faces the adjacent sub-pixels in the x direction, such as light rays R8 and R9, can be shielded.
According to this modification, since the light-shielding wall 7E is separately formed after the filter unit 3 is formed, the filter unit 3 can be easily manufactured as compared with the case where the light-shielding wall 7E is also formed.

[Third Embodiment]
The color filter and the display device according to the 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 the line F15-F15 in FIG. FIG. 17 is a cross-sectional view taken along the line F16-F16 in FIG.

The organic EL display device 100F (display device) of the present embodiment shown in FIG. 15 includes unit pixels P10 having a rectangular shape in a plan view in place of each of the unit pixels P of the organic EL display device 100 of the first embodiment. .. The application of the organic EL display device 100F is not particularly limited. For example, the organic EL display device 100F can be used as a display device for electronic devices such as smart glasses, head-mounted displays, and electronic viewfinders, like the organic EL display device 100.
Hereinafter, the points different from the first embodiment will be mainly described.

The x width of the unit pixel P10 is Wx, and the y width is Wy. In particular, when Wx = Wy, the plan view shape of the unit pixel P10 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 each other on the x-direction side of each of the first sub-pixel area P11 and the second sub-pixel area P12.

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

As shown in FIG. 16, the organic EL display device 100F has a main body portion 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 the same as the light emitting element 5 in the first embodiment except that the shape in a plan view is different. The light emitting element 15 includes a light emitting element 15A provided in the first sub pixel area P11 and the second sub pixel area P12, and a light emitting element 15B provided in the third sub pixel area P13. For example, as the light emitting element 15, an organic EL element may be used.
As shown in FIG. 16, the plan view shape of each light emitting element 15A is a rectangular shape slightly smaller than the outer shape of the first sub-pixel area P11 and the second sub-pixel area P12 in which each is arranged.
The plan view shape of the light emitting element 15B is a rectangular shape slightly smaller than the outer shape of the third sub-pixel area P13 in which each is arranged.

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

The filter unit 13 replaces the first colored layer 31, the second colored layer 32, and the third colored layer 33 of the filter unit 3 with the first colored layer 41 (sub-pixel, second sub-pixel) and the second colored layer. It has 42 (sub-pixel, second sub-pixel) and a third colored layer 43 (sub-pixel, elongated pixel, first sub-pixel).

The first colored layer 41 is superimposed on the first sub-pixel area P11. The first colored layer 41 forms, for example, sub-pixels having a red transmission wavelength range.
As shown in FIG. 15, the second colored layer 42 is arranged adjacent to the first colored layer 41 along the y direction. The second colored layer 42 is superimposed on the second sub-pixel area P12. The second colored layer 42 forms, for example, sub-pixels having a green transmission wavelength range.
The plan-view shape of the first colored layer 41 and the second colored layer 42 is a rectangle having an x width of Wx / 2 and a y width of Wy / 2.

The third colored layer 43 is superimposed on the third sub-pixel area P13. The third colored layer 33 forms, for example, sub-pixels having a blue transmission wavelength range.
The first colored layer 41 and the second colored layer 42 are adjacent to one side of the third colored layer 43 in the longitudinal direction. The plan-view shape of the third colored layer 43 is a rectangular shape having an x width of Wx / 2 and a y width of Wy, which is elongated in the y direction. Therefore, the aspect ratio of the third colored layer 43 is 2 × Wy / Wx, which is larger 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.
On the other hand, the aspect ratio of the first colored layer 41 and the second colored layer 42 adjacent to the third colored layer 43 is half the aspect ratio of the third colored layer 43, which is smaller than that of the third colored layer 43.

As described above, among the three sub-pixels in the filter unit 13, the first colored layer 41 and the second colored layer 42 form the first sub-pixel and the second sub-pixel, respectively. The first sub-pixel and the second sub-pixel are rectangular and are sub-pixels having two first transmission wavelength regions and second transmission wavelength regions of red, green, and blue.
The third colored layer 43 forms a third sub-pixel. The third sub-pixel is an elongated pixel having an aspect ratio larger than each aspect ratio of the first sub-pixel and the second sub-pixel, and is the first transmission wavelength region and the second wavelength region of red, green, and blue. It is a sub-pixel having a third wavelength region different from that of.

The filter unit 13 is formed in the same manner as the filter unit 3 except that the shape and arrangement of the sub-pixels in a plan view are different.

The lens 1 in the present embodiment is the same as the lens 1 in the first embodiment except that four lenses 1 are arranged in the unit pixel P10.
Therefore, two lenses 1 in the present embodiment are arranged in the first sub-pixel area P11 and the second sub-pixel area P12, respectively, and in the third sub-pixel area P13.
Each lens 1 is arranged so as to face the first colored layer 41, the second colored layer 42, and the third colored layer 43 with the flattening layer 2 interposed therebetween. In particular, the two lenses 1 facing the third colored layer 43 are arranged side by side in the y direction, which is the longitudinal direction of the third colored layer 43.
Each lens 1 may have a gap formed between the adjacent lenses 1 and the lenses 1, but in the present embodiment, as in the first embodiment, the lenses 1 are densely arranged so that a part of the outer edge is in contact with each other. There is.
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 the present embodiment is an example in which two lenses are arranged so as to face the elongated pixels.
Since the organic EL display device 100F of the present 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, the front luminance, visibility, and visibility are the same as those of the first embodiment. Becomes good.

In each of the above embodiments and modifications, the aspect ratio of the elongated pixels is equal to or close to 3 or 2. However, the aspect ratio of the elongated pixel is not particularly limited as long as it is larger than 1.
The number of lenses facing the elongated pixels is not particularly limited as long as they can be closely arranged in the longitudinal direction of the elongated pixels. However, when the aspect ratio of the elongated pixel is 1.5 or more, the number of lenses is more preferably the number obtained by rounding off the first decimal place of the aspect ratio. In this case, since the ratio of the length in the long axis direction to the length in the short axis direction of the lens in plan view can be set to a value close to 1, it is easy to reduce the anisotropy of the focusing performance.

In each of the above embodiments and modifications, the case where the light emitting element is an organic EL element has been described. However, the type of light emitting element is not limited to the organic EL element. For example, an example of a light emitting element includes an inorganic LED element and the like.

In each of the above-described embodiments and modifications, examples have been described in which red, green, and blue sub-pixels are arranged in the first sub-pixel area, the second sub-pixel area, and the third sub-pixel area, respectively. However, if the unit pixel can be displayed in color, the color of the sub-pixel and the arrangement position are not limited to this.

Examples 1 and 2 of the color filter and the display device of the first and third embodiments will be described together with Comparative Examples 1 and 2. The following [Table 1] shows the configurations of Examples 1 and 2 and Comparative Examples 1 and 2 and the evaluation results.

[Example 1]
The first embodiment is an embodiment corresponding to the first embodiment.
The size of the unit pixel P of the first embodiment is Wx = Wy = 9 (μm), and the x width × y width of the first sub-pixel area P1, the second sub-pixel area P2, and the third sub-pixel area P3. Was 3 μm × 9 μm, respectively.
As shown in [Table 1], the first colored layer 31 (sub-pixel R in [Table 1]), the second colored layer 32 (sub-pixel G in [Table 1]), and the third colored layer 33 ([Table 1]). The x-width x y-width of the sub-pixel B) in 1] was 3 μm × 9 μm, respectively.
Each lens 1 is provided with three facing each sub-pixel. The x-width x y-width of each lens 1 was 3 μm × 3 μm.

In order 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. Further, a white organic EL element was formed on the TFT layer by a known method such as a vapor deposition method, and then silicon nitride was coated by the CVD method to form an organic EL element substrate.
Here, the silicon substrate and the white organic EL element correspond to the substrate 6 and the light emitting element 5, respectively.

In order to manufacture the filter unit 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.

In [Table 2], the "resin" is a binder and the "monomer" is a curing agent. The initiator is an additive for radically polymerizing the curing agent. Chain transfer agents are additives for promoting radical polymerization.

The red coloring material R-1 used in the photosensitive coloring composition RR-1 was prepared as follows.
After uniformly stirring and mixing the mixture MR having the following composition, the mixture MR was dispersed for 5 hours in a sand mill using a glass bead having a diameter of 1 mm. Then, the mixture MR was filtered through a 5 μm filter to obtain a red coloring material R-1.
In the mixture MR, C.I. I. As Pigment Red 254, Irger for Red B-CF (trade name; manufactured by BASF) was used. C. I. As Pigment Yellow 139, Palodol (registered trademark) Yellow L 2146HD (trade name; manufactured by BASF) was used.

(Composition of mixture MR)
Red pigment: C.I. I. Pigment Red 254 78 parts by weight Yellow pigment: C.I. I. Pigment Yellow 139 22 parts by weight Acrylic varnish (20% solid content) 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 having the following composition was used instead of the mixture MG.
In the mixture MG, C.I. I. As Pigment Green 58, FASTOGEN (registered trademark) GREEN A110 (trade name; manufactured by DIC Corporation) was used. C. I. As Pigment Yellow 185, Palotol (registered trademark) Yellow L 1155 (trade name; manufactured by BASF) was used.

(Composition of mixture MG)
Green pigment: C.I. I. Pigment Green 58 65 parts by weight Yellow pigment: C.I. I. Pigment Yellow 185 35 parts by weight Acrylic varnish (20% solid content) 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, C.I. I. As Pigment Blue 15: 6, LIONOL (registered trademark) BLUE ES (trade name; manufactured by Toyo Color Co., Ltd.) was used. C. I. As Pigment Violet 23, LIONOGEN (registered trademark) VIOLET RLUE ES (trade name; manufactured by Toyo Color Co., Ltd.) was used.

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

The lens 1 and the flattening layer 2 can be formed by using a transparent material obtained by removing the coloring material for coloring from the photosensitive coloring compositions RR-1, GR-1, and BR-1. For example, the refractive index can be adjusted by containing an inorganic component such as silica, titanium oxide, or a zirconium oxide dispersion as a refractive index adjusting material instead of the coloring material. By adjusting the type and content of the refractive index adjusting material, for example, a refractive index in the range of 1.5 to 1.65 can be obtained.
In this embodiment, as the material of the lens 1 and the flattening layer 2, a transparent material obtained by removing the coloring material for coloring from the photosensitive coloring compositions RR-1, GR-1, and BR-1 has a refractive index of 1. It was used by containing titanium oxide so as to be 6.

The organic EL display device 100 of this embodiment was manufactured as follows.
The transparent resin composition for forming the flattening film 4 on the above-mentioned organic EL element substrate was applied with a spinner so that the cured film thickness was 0.1 μm. Then, the transparent resin composition was cured by heating at 100 ° C. for 10 minutes using a heating oven to form a flattening film 4. As a result, the main body 9 was formed.
The green photosensitive resin composition GR-1 was applied onto the main body 9 with a spinner so that the cured film thickness was 1.2 μm. After that, ultraviolet exposure, alkaline development, washing with water, and drying were performed via a pattern mask to temporarily form a second colored layer 32, which is a green sub-pixel, in each second sub-pixel area P2. The x-width × y-width in each second colored layer 32 was 3 μm × 9 μm. Then, it was heated at 80 ° C. for 10 minutes using a heating oven to cure the temporarily formed second colored layer 32.

After that, the first colored layer 31 was formed in the same manner as the method for forming the second colored layer 32, except that the red photosensitive resin composition RR-1 was used to form the first sub-pixel region P1.
After that, the third colored layer 33 was formed in the same manner as the method for forming the second colored layer 32, except that the blue photosensitive resin composition BR-1 was used to form the third colored layer 33.
As described above, 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 flattening layer 2 was applied onto the filter portion 3 with a spinner so that the film thickness of the cured finish was 3 μm. After that, the entire coating film was exposed to ultraviolet rays and then heated at 80 ° C. for 10 minutes using a heating oven to cure the coating film and form a transparent resin layer.
After that, a convex lens 1 having a height of 1.5 μm and a x direction and a y width of 3 μm was formed on the surface of the transparent resin layer by an etch back method. Three lenses 1 were formed above the first colored layer 31, the second colored layer 32, and the third colored layer 33, respectively.

After that, the surface of the lens 1 was bonded to the cover glass using a sealing agent, Stract Bond (registered trademark) XMF-T107 (trade name; manufactured by Mitsui Chemicals, Inc.). As a result, the organic EL display device 100 of Example 1 was manufactured.

[Example 2]
The second embodiment is an embodiment corresponding to the third embodiment.
The size of the unit pixel P10 of the second embodiment was the same as that of the unit pixel P. The x-width x y-width of the first sub-pixel area P11 and the second sub-pixel area P12 were 4.5 μm × 4.5 μm, respectively. The x-width x y-width of the third sub-pixel area P13 was 4.5 μm × 9 μm.
As shown in [Table 1], the x-width x y-width of the first colored layer 41 (sub-pixel R in [Table 1]) and the second colored layer 42 (sub-pixel G in [Table 1]), respectively. It was 4.5 μm × 4.5 μm. The x-width x y-width of the third colored layer 43 (sub-pixel B in [Table 1]) was 4.5 μm × 9 μm.
Each lens 1 was provided one by one facing the first colored layer 41 and the second colored layer 42. Two were provided facing the third colored layer 43. The x-width x y-width of each lens 1 was 4.5 μm × 4.5 μm.
The organic EL display device 100F of Example 2 was manufactured in the same manner as in 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 the organic EL display device 110 shown in FIGS. 6 and 7.
As shown in [Table 1], the organic EL display device 110 of Comparative Example 1 was the same as that of Example 1 except that the x width × y width of the lens 111 in plan view was 3 μm × 9 μm. ..

[Comparative Example 2]
As shown in [Table 1], in the organic EL display device of Comparative Example 2, except that one lens having a lens x width × y width of 3 μm × 9 μm was arranged facing the third colored layer 43. , It was the same as in Example 2.

[evaluation]
Visibility evaluation of Examples 1 and 2 and Comparative Examples 1 and 2 was performed.
In this evaluation, the organic EL display devices of Examples 1 and 2 and Comparative Examples 1 and 2 are lit in white, observed from the front (z direction) and diagonally, and the visibility is evaluated based on the visual brightness. did.
The legibility of the front view was judged by whether the brightness of the screen was easy to see.
If the screen is easy to see, it is good (indicated as A in [Table 1]), and if the screen is dark and difficult to see, it is inferior (indicated as B in [Table 1]).
The visibility from the oblique direction was determined based on the change in brightness when the observation angle was changed from 0 ° to 45 ° in a plane orthogonal to the x direction, with the front surface as 0 °.
When the change in brightness was acceptable, it was considered good (denoted as A in [Table 1]), and when the change in brightness was not acceptable, it was considered poor (denoted as B in [Table 1]).

[Evaluation results]
As shown in [Table 1], in Examples 1 and 2, both the frontal visibility and the oblique visibility were good. Therefore, the organic EL display devices of Examples 1 and 2 have excellent visibility.
In Comparative Examples 1 and 2, both the frontal visibility and the oblique visibility were poor.
In Comparative Examples 1 and 2, the front luminance was lower than that of Examples 1 and 2, and it was difficult to see. Further, when observing from an oblique direction, the variation in brightness depending on the observing angle was larger than in Examples 1 and 2.
It is considered that Comparative Examples 1 and 2 were due to the fact that the focusing performance in the y direction was deteriorated due to the arrangement of the elongated lens in the y direction.

Although the preferred embodiments and modifications of the present invention have been described above together with the embodiments, the present invention is not limited to the embodiments, the modifications, and the embodiments. It is possible to add, omit, replace, and make other changes to the configuration without departing from the spirit of the present invention.
Further, the present invention is not limited by the above description, but is limited only by the appended claims.
For example, the light-shielding wall in the second embodiment and its modifications may be provided in the color filter of the third embodiment.

1 Lens 1a Convex lens surface 2, 2C, 2E Flattening layer 3, 3A, 3B, 3C, 3D, 13 Filter unit 4 Flattening film 5, 15, 15A, 15B Light emitting element 6 Substrate 7A, 7B, 7C, 7D, 7E Light-shielding walls 9, 19 Main body 10, 10A, 10B, 10C, 10D, 10E, 10F Color filter 31 First colored layer (sub-pixel, elongated pixel)
32 Second colored layer (secondary pixel, elongated pixel)
33 Third colored layer (secondary pixel, elongated pixel)
41 First coloring layer (sub-pixel, first sub-pixel)
42 Second colored layer (sub-pixel, second sub-pixel)
43 Third colored layer (sub-pixel, elongated pixel, third sub-pixel)
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 1st sub-pixel area P2, P12 2nd sub-pixel area P3, P13 3rd sub-pixel area

Claims (8)

In the region forming a unit pixel of color display, a plurality of sub-pixels having different transmission wavelength ranges from each other and
A plurality of lenses arranged facing each of the plurality of sub-pixels and condensing light transmitted through the plurality of sub-pixels, and a plurality of lenses.
Equipped with
At least one of the plurality of sub-pixels is an elongated pixel in which the ratio of the length in the longitudinal direction to the length in the lateral direction is larger than 1 when viewed from the thickness direction through which the light is transmitted.
Among the plurality of lenses, two or more lenses that collect the light transmitted through the elongated pixels are arranged along the longitudinal direction.
Color filter. The ratio is 1.5 or more,
The number of the lenses facing the elongated pixels is equal to the number rounded to the first decimal place of the ratio.
The color filter according to claim 1. The plurality of lenses are closely arranged in the longitudinal direction.
The color filter according to claim 1 or 2. 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 lateral direction, and have the same length in the longitudinal direction.
The color filter according to any one of claims 1 to 3. The plurality of sub-pixels are
A first subpixel that is rectangular and has a first transmission wavelength range of either red, green, or blue.
A second sub-pixel having a rectangular shape and having a second transmission wavelength range different from the first transmission wavelength range among the red, the green, and the blue.
The elongated pixel whose ratio is larger than the ratio of the length in the longitudinal direction to the length in the lateral direction in each of the first sub-pixel and the second sub-pixel, the red, the green, and the blue. Among the third subpixels having a third transmission wavelength range different from the first transmission wavelength range and the second transmission wavelength range,
Includes
The first sub-pixel and the second sub-pixel are both adjacent to the third sub-pixel in the lateral direction of the third sub-pixel, and adjacent to each other in the longitudinal direction of the third sub-pixel. And are placed,
The color filter according to any one of claims 1 to 3. Further, a light-shielding wall arranged between the sub-pixels adjacent to each other among the plurality of sub-pixels and at least one of the sub-pixels adjacent to each other on the boundary line is further provided.
The color filter according to any one of claims 1 to 5. The color filter according to any one of claims 1 to 6 and the color filter.
A plurality of light emitting elements facing each of the plurality of sub-pixels,
A display device. The light emitting element is an organic EL element.
The display device according to claim 7.

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