Color filter and display device

Abstract

A color filter of the present application has a plurality of sub-pixels having mutually different transmission wavelength ranges in regions of unit pixels forming a color display, and a plurality of lenses respectively arranged opposite the plurality of sub-pixels to converge light transmitted from the plurality of sub-pixels. At least one of the plurality of sub-pixels is an elongated pixel having a ratio of a length in a long direction to a length in a short direction greater than 1, as viewed in a thickness direction of the light transmission. The lens of the plurality of lenses that converges the light transmitted from the elongated pixel is arranged with two or more in the long direction.

Description

TECHNICAL FIELD

[0001] The present application relates to a color filter and a display device.

[0002] This application claims priority based on Japanese Patent Application No. 2020-111962 filed on June 29, 2020, and Japanese Patent Application No. 2020-111963 filed on June 29, 2020, the contents of which are incorporated herein. BACKGROUND

[0003] For example, with respect to a display device such as an organic electroluminescence (EL) display device, a structure is known in which a plurality of organic EL elements that generate white light are arranged in one pixel region, and a color filter and a lens are arranged above each of the organic EL elements, respectively.

[0004] For example, in Patent Literature 1, an organic EL display device is disclosed in which three organic EL elements that generate white light are arranged in one pixel region, and a color filter that transmits light of each of red (R), green (G), and blue (B) colors and a lens that is arranged on each color filter are provided above each of the organic EL elements.

[0005] For example, in Patent Literature 2, a display device is disclosed in which a light emitting element including an organic layer that generates white light and is formed in a concave shape is arranged in one pixel region, and a color filter that transmits light of each of R, G, and B colors and a lens that is arranged on each color filter are provided above each of the light emitting elements.

[0006] Patent Literature 1: Japanese Patent Application Publication No. 2014-2880

[0007] Patent Literature 2: Japanese Patent Application Publication No. 2019-133816 SUMMARY

[0008] However, the prior art described above has the following problems.

[0009] The lenses of Patent Literatures 1 and 2 are provided in order to improve the front luminance of light from the light emitting elements.

[0010] In Patent Literature 1, light emitted from a square organic EL element and transmitted through a color filter is condensed, thereby improving the front luminance. In Patent Literature 1, three organic EL elements having the same shape of light emitting region are arranged in a triangular shape in one pixel region, and a color filter is also arranged in the same manner. Further, the planar shape of a lens is circular. Therefore, in one pixel, a gap increases between sub-pixels that respectively form display light of wavelength components of R, G, and B. With this structure, if the resolution is improved, the sub-pixel becomes too small, and thus it is difficult to manufacture a color filter, and it can be impossible to achieve high resolution.

[0011] Further, in Patent Literature 1, a microlens is formed on a color filter composed of sub-pixels that respectively form display light of wavelength components of red, green, and blue, which is provided for a unit pixel having a size of 12 μm x 12 μm. A large gap is provided between the sub-pixels for a color mixing countermeasure. Therefore, the aperture ratio of the color filter decreases, and thus it is impossible to greatly improve the resolution.

[0012] In Patent Literature 2, after light emitted from a concave organic layer is condensed by an internal lens, the light is transmitted through a color filter and emitted to the outside through a piece microlens arranged at the outermost portion.

[0013] With this structure, even if the resolution is improved, the color filter does not become too small, but the organic layer becomes too small, and thus it can be difficult to achieve high luminance.

[0014] Further, a black matrix is formed between the color filters, and thus these components complement each other without causing light from the light emitting element to be emitted from an adjacent color filter.

[0015] In this case, the front luminance can be improved, and color mixing can be suppressed, but the manufacturing process of forming the organic layer in a concave shape or forming a black matrix increases, and thus the manufacturing cost increases.

[0016] For example, as a sub-pixel, it is also considered to divide one pixel region into three portions in one direction. For example, it is considered to arrange an organic EL element, a color filter, and a lens in a rectangular shape that equally divides one side of a pixel. In this case, when viewed from above, the sub-pixel is formed in an elongated rectangular shape in which the length in the long direction is three times the width in the short direction.

[0017] According to this structure, the sub-pixel can be arranged in the pixel region without a gap, and thus it is suitable for high resolution.

[0018] However, regarding a lens longer in one direction, anisotropy of the refractive power required in the long side direction and the short side direction increases, and thus there is a problem that a minute lens having a good light extraction efficiency cannot be produced. For example, the radius of curvature in the long side direction is excessively large compared to the radius of curvature in the short side direction, and thus the lens performance becomes close to that of a cylindrical lens, and the condensing performance in the long side direction deteriorates. As a result, there is a problem that the front luminance decreases, and the visual confirmation when viewing obliquely in the long side direction easily deteriorates.

[0019] The present application has been made in view of the above problems, and has an object to provide a color filter and a display device in which the front luminance and the visual confirmation are good even if a sub-pixel in a unit pixel region is long in one direction, and the front luminance and the color reproduction are good even if the structure is simplified.

[0020] To solve the above problems, a color filter according to a first aspect of the present application includes a plurality of sub-pixels having mutually different transmission wavelength ranges in a region of a unit pixel that forms a color display, and a plurality of lenses that are respectively arranged opposite to the plurality of sub-pixels, and condense light transmitted from the plurality of sub-pixels, at least one of the plurality of sub-pixels being an elongated pixel in which a ratio of a length in a long side direction to a length in a short side direction is greater than 1, as viewed in a thickness direction from which the light is transmitted, and the lens of the plurality of lenses that condenses the light transmitted from the elongated pixel is arranged in the long side direction in a number of two or more.

[0021] On the basis of the above color filter, the ratio can be formed to be 1.5 or more, and the number of the lenses opposite to the elongated pixel can be equal to a number obtained by rounding off the first digit after the decimal point of the ratio.

[0022] On the basis of the above color filter, the plurality of lenses can be densely arranged in the long side direction.

[0023] On the basis of the above color filter, the plurality of sub-pixels can include three sub-pixels having mutually different transmission wavelength ranges of red, green, and blue, the three sub-pixels all being the elongated pixel, and arranged in the short side direction with the length in the long side direction being equal to each other.

[0024] On the basis of the above color filter, the plurality of sub-pixels can be formed to include: a first sub-pixel that is rectangular, has an arbitrary first transmittance wavelength range of red, green, and blue; a second sub-pixel that is rectangular, has a second transmittance wavelength range of the red, the green, and the blue that is different from the first transmittance wavelength range; and a third sub-pixel that is the elongated pixel having a ratio of a length in a short direction to a length in a long direction that is larger than a ratio of the length in the short direction to the length in the long direction of each of the first sub-pixel and the second sub-pixel, has a third transmittance wavelength range of the red, the green, and the blue that is different from the first transmittance wavelength range and the second transmittance wavelength range, and the first sub-pixel and the second sub-pixel are each disposed adjacent to the third sub-pixel in the short direction of the third sub-pixel and adjacent to each other in the long direction of the third sub-pixel.

[0025] On the basis of the above color filter, the color filter can be formed to further have a light-blocking wall disposed at least one of between sub-pixels adjacent to each other among the plurality of sub-pixels and on a boundary line of the sub-pixels adjacent to each other.

[0026] The display device according to the second aspect of the present application includes the above color filter and a plurality of light-emitting elements each opposed to the plurality of sub-pixels.

[0027] On the basis of the above display device, the light-emitting element can be an organic EL element.

[0028] To solve the above problems, the color filter according to the third aspect of the present application includes: a first sub-pixel included in a plurality of sub-pixels constituting a unit pixel of a color display, having a first transmittance wavelength range; a first lens disposed opposite the first sub-pixel in a thickness direction of the first sub-pixel; a second sub-pixel included in a plurality of sub-pixels constituting the unit pixel or another unit pixel adjacent to the unit pixel, having a second transmittance wavelength range different from the first transmittance wavelength range and a same thickness as the first sub-pixel, and being adjacent to the first sub-pixel; a second lens disposed opposite the second sub-pixel in a thickness direction of the second sub-pixel, and disposed adjacent to the first lens in a same direction as an adjacent direction of the second sub-pixel with respect to the first sub-pixel; and a planarization layer disposed between the first sub-pixel and the second sub-pixel and the first lens and the second lens, satisfying the following equations (1) to (5).

[0029] [Mathematical Expression 1]

[0030] T = t1 + t2... (1)

[0031] w > T... (2)

[0032] d = 2 x (W - T)... (3)

[0033] 0.8 x w ≤ L < w... (4)

[0034] L = w - d... (5)

[0035] Here, t1 is the thickness of the first and second sub-pixels, t2 is the thickness of the planarization layer, w is the width of the first and second sub-pixels in the adjacent direction, L is the width of the first and second lenses in the adjacent direction, and d is the distance between the first and second lenses in the adjacent direction.

[0036] On the basis of the above color filter, the unit pixel and the other unit pixel can be formed to include three sub-pixels each having a mutually different transmission wavelength range of red, green, and blue, arranged in the same adjacent direction, the lengths of the directions orthogonal to the adjacent direction of the three sub-pixels being equal to each other, and the formulae (1) to (5) being satisfied in at least one group of sub-pixels adjacent to each other among the three sub-pixels.

[0037] On the basis of the above color filter, the unit pixel and the other unit pixel can be formed to include a first color sub-pixel having a transmission wavelength range of an arbitrary first color of red, green, and blue, a second color sub-pixel having a transmission wavelength range of a second color different from the first color among the red, green, and blue, and a third color sub-pixel having a transmission wavelength range of a third color different from the first and second colors among the red, green, and blue, elongated in one direction, the first and second color sub-pixels being adjacent to each other in the long side direction of the third color sub-pixel, and the first and second color sub-pixels being respectively arranged adjacent to the third color sub-pixel in the short side direction intersecting the long side direction of the third color sub-pixel, and the formulae (1) to (5) being satisfied in at least one group of sub-pixels adjacent to each other among the first, second, and third color sub-pixels.

[0038] The display device according to the fourth aspect of the present invention includes the above color filter and a plurality of light emitting elements each opposed to the plurality of sub-pixels constituting the unit pixel.

[0039] On the basis of the above display device, the light emitting element can be an organic EL element.

[0040] Effects of the Invention

[0041] The color filter and the display device according to the present application are excellent in front luminance and visual confirmation even if the sub-pixels of the unit pixel region are long in one direction. Also, the front luminance and color reproducibility are excellent even if the structure is simplified. BRIEF DESCRIPTION OF DRAWINGS

[0042] Figure 1 is a schematic plan view showing one example of a display device according to the first embodiment of the present application.

[0043] Figure 2 is a sectional view along the F2-F2 line in Figure 1 .

[0044] Figure 3 is a sectional view along the F3-F3 line in Figure 1 .

[0045] Figure 4 is a schematic view for explaining the action of a color filter according to the first embodiment of the present application.

[0046] Figure 5 is a schematic view for explaining the action of a color filter according to the first embodiment of the present application.

[0047] Figure 6 is a schematic plan view showing one example of a display device according to the first embodiment of the present application.

[0048] Figure 7 is a sectional view along the F7-F7 line in Figure 6 .

[0049] Figure 8 is a schematic plan view showing one example of a display device according to the second embodiment of the present application.

[0050] Figure 9 is a sectional view along the F9-F9 line in Figure 8 .

[0051] Figure 10 is a schematic plan view showing one example of a display device according to the first modification of the second embodiment of the present application.

[0052] Figure 11 is a sectional view along the F11-F11 line in Figure 10 .

[0053] Figure 12 is a schematic plan view showing one example of a display device according to the second modification of the second embodiment of the present application.

[0054] Figure 13 is a schematic cross-sectional view showing one example of a display device according to a third modification of the second embodiment of the present application.

[0055] Figure 14 is a schematic cross-sectional view showing one example of a display device according to a fourth modification of the second embodiment of the present application.

[0056] Figure 15 is a schematic plan view showing one example of a display device according to the third embodiment of the present application.

[0057] Figure 16 is a cross-sectional view taken along the line F15-F15 in Figure 15 .

[0058] Figure 17 is a cross-sectional view taken along the line F16-F16 in Figure 15 .

[0059] Figure 18 is a schematic plan view showing one example of a display device according to the fourth embodiment of the present application.

[0060] Figure 19 is a cross-sectional view taken along the line F202-F202 in Figure 18 .

[0061] Figure 20 is a schematic ray diagram showing the operation of a color filter according to the fourth embodiment of the present application.

[0062] Figure 21 is a schematic ray diagram showing the operation of a color filter of the present example 2.

[0063] Figure 22 is a schematic ray diagram showing the operation of a color filter of the present example 3.

[0064] Figure 23 is a schematic ray diagram showing the operation of a color filter of the present example 4.

[0065] Figure 24 is a schematic plan view showing one example of a display device according to the fifth embodiment of the present application.

[0066] Figure 25 is a cross-sectional view taken along the line F208-F208 in Figure 24 .

[0067] Figure 26 is a cross-sectional view taken along the line F209-F209 in Figure 24 .

[0068] Figure 27 is a cross-sectional view along the line F2-F2 in Figure 24 DETAILED DESCRIPTION

[0069] Embodiments of the present application will be described with reference to the accompanying drawings.

[0070] In each drawing used in the following description, components are shown with sizes that allow for identification, and the scale of each component is appropriately changed. The size and ratio of each structural element are appropriately different from actual conditions. In all drawings, the same reference numerals are assigned to the same or equivalent components even in cases where the embodiments differ, and common descriptions are omitted.

[0071] [1st Embodiment]

[0072] A color filter and a display device according to the 1st embodiment of the present application will be described.

[0073] Figure 1 is a schematic plan view showing one example of a display device according to the 1st embodiment of the present application.

[0074] Figure 2 is a cross-sectional view along the line F2-F2 in Figure 1 Figure 3 is a cross-sectional view along the line F3-F3 in Figure 1

[0075] Figure 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 an electronic instrument such as smart glasses, a head-mounted display, an electronic viewfinder, or the like.

[0076] The structure of a unit pixel P of the organic EL display device 100 according to the 1st embodiment is shown in FIG. 2. Here, plan view refers to viewing from the display surface of the organic EL display device 100 toward the light emitting element. The plan view can also be viewing from the thickness direction of the filter portion 3 described later. Figure 1 The unit pixel P is the smallest region that performs color display. For example, with respect to the organic EL display device 100,

[0077] The unit pixels P shown in FIG. 1 are arranged adjacent to each other in the illustrated x direction from left to right, and in the illustrated y direction from bottom to top, respectively. The z direction is the direction from the inner side of the paper toward the front side in the illustrated direction that is orthogonal to the x direction and the y direction. The z direction is the direction opposite to the plan view direction. Figure 1

[0078] ​​​​The display screen formed by all unit pixels P in the organic EL display device 100 has a rectangular shape with sides in the x and y directions. The width of each unit pixel P in the x direction is Wx, and the width in the y direction is Wy. Wx and Wy can be equal or different.

[0079] For the sake of simplicity, the width of a region, component, etc. in the x-direction is sometimes referred to as the x-width, and the width in the y-direction is referred to as the y-width.

[0080] A unit pixel P has a first subpixel region P1, a second subpixel region P2, and a third subpixel region P3. The first subpixel region P1, the second subpixel region P2, and the third subpixel region P3 are arranged sequentially in the x-direction. The first subpixel region P1, the second subpixel region P2, and the third subpixel region P3 divide the unit pixel P into three equal parts in the x-direction.

[0081] In the organic EL display device 100, the structure of each unit pixel P is the same, so the following explanation uses an example of a single unit pixel P.

[0082] When viewed from above, the first subpixel region P1 is a rectangle with an x-width of Wx / 3 and a y-width of Wy. The first subpixel region P1 is, for example, displayed in red.

[0083] When viewed from above, the second subpixel region P2 is a rectangle with an x-width of Wx / 3 and a y-width of Wy. For example, the second subpixel region P2 is displayed in green.

[0084] When viewed from above, the third subpixel region P3 is a rectangle with an x-width of Wx / 3 and a y-width of Wy. The third subpixel region P3, for example, is displayed in blue.

[0085] like Figure 2 As shown, the organic EL display device 100 has a main body 9 and a color filter 10.

[0086] The main body 9 has a substrate 6, a light-emitting element 5, and a planarization film 4.

[0087] The top view of substrate 6 is larger than the display screen of organic EL display device 100. Substrate 6 is formed, for example, from a silicon substrate.

[0088] The light-emitting element 5 emits white light. For example, an organic EL element can be used as the light-emitting element 5. In an organic EL element, a DC voltage is applied between the anode and the cathode to inject electrons and holes into the light-emitting layer and cause them to recombine to generate excitons. Light is emitted by releasing light when the excitons are deactivated.

[0089] The light-emitting elements 5 are respectively disposed in the first subpixel region P1, the second subpixel region P2 and the third subpixel region P3.

[0090] As Figure 1 shown, the plan view shape of each light emitting element 5 is a rectangle that is slightly smaller than the outer shape of the first sub-pixel region P1, the second sub-pixel region P2, and the third sub-pixel region P3 that are respectively arranged.

[0091] In Figure 1 the example shown, the x width of each light emitting element 5 is slightly smaller than Wx / 3, and the y width is slightly smaller than Wy.

[0092] The light emitting element 5 is manufactured on a silicon substrate, for example, using a semiconductor manufacturing process.

[0093] The electrodes of each light emitting element 5 are connected to an omitted drive circuit through wiring formed on the substrate 6. The drive circuit controls the lighting and extinguishing of each light emitting element 5 based on an image signal.

[0094] As Figure 2 shown, the planarization film 4 covers at least the substrate 6 and the light emitting element 5 of each unit pixel P, and forms a planar surface 4a on the surface in the z direction. The planar surface 4a is a plane that extends over the entire display region of the organic EL display device 100.

[0095] 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 coming into contact with the light emitting element 5, thereby suppressing degradation of the light emitting element 5.

[0096] The material of the planarization film 4 is composed of a transparent resin material that has a good transmittance with respect to visible light. For the material of the planarization film 4, it is more preferable to use a material that has a high barrier property with respect to at least one of moisture and oxygen.

[0097] The film thickness of the planarization film 4 on the light emitting element 5 is, for example, 0.1 μm.

[0098] The color filter 10 has, in order in the z direction, the light filtering portion 3, the planarization layer 2, and the lens 1.

[0099] The light filtering portion 3 is a layered portion that has a constant thickness with an upper surface 3a and a lower surface 3b. The thickness of the light filtering portion 3 is not particularly limited. For example, the thickness of the light filtering portion 3 can be 1.2 μm.

[0100] The light filtering portion 3 covers the planarization film 4 in a state in which the lower surface 3b is in close contact with the planar surface 4a.

[0101] The light filtering portion 3 restricts the transmittance wavelength of light that enters from each light emitting element 5 via the planarization film 4.

[0102] The light-filtering portion 3 is composed 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).

[0103] The first colored layer 31 overlaps the first sub-pixel region P1. The first colored layer 31 forms, for example, a sub-pixel having a transmission wavelength range of red color.

[0104] The second colored layer 32 is arranged adjacent to the first colored layer 31 in the x direction. The second colored layer 32 overlaps the second sub-pixel region P2. The second colored layer 32 forms, for example, a sub-pixel having a transmission wavelength range of green color.

[0105] The third colored layer 33 is arranged adjacent to the second colored layer 32 in the x direction. The third colored layer 33 overlaps the third sub-pixel region P3. The third colored layer 33 forms, for example, a sub-pixel having a transmission wavelength range of blue color.

[0106] In the first embodiment, each of the first colored layer 31, the second colored layer 32, and the third colored layer 33 has a rectangular shape elongated in the y direction as viewed in the thickness direction, and has the same shape as the first sub-pixel region P1, the second sub-pixel region P2, and the third sub-pixel region P3, respectively. Thus, the first colored layer 31, the second colored layer 32, and the third colored layer 33 forming three sub-pixels are formed in a shape that trisects the unit pixel P in the x direction.

[0107] The ratio of the length of the long side direction of the rectangle to the length of the short side direction is referred to as the aspect ratio. The aspect ratio in the case where the rectangle is a square is set to 1.

[0108] In the first embodiment, the length of the short side direction of each sub-pixel is Wx / 3, and the length of the long side direction is Wy, and thus the aspect ratio of each sub-pixel is 3 x Wy / Wx. In particular, in the case where the unit pixel P is a square (Wx = Wy), the aspect ratio of each sub-pixel is 3.

[0109] If a sub-pixel having an aspect ratio greater than 1 is particularly referred to as an elongated pixel, in the first embodiment, the first colored layer 31, the second colored layer 32, and the third colored layer 33 are all elongated pixels.

[0110] The light-filtering portion 3 is formed by curing a resin composition in which colorants corresponding to respective transmission wavelength ranges are dispersed in a transparent resin.

[0111] The planarization layer 2 is a layer-shaped portion having a constant thickness that is laminated on the upper surface 3a of the light-filtering portion 3. The upper surface 2a of the planarization layer 2 is a plane parallel to the lower surface 3b of the light-filtering portion 3.

[0112] The material of the planarization layer 2 is a transparent resin material having a good transmittance with respect to visible light.

[0113] Lenses 1 are arranged opposite 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, separated by a planarization layer 2, and converge the light transmitted from the first colored layer 31, the second colored layer 32, and the third colored layer 33, respectively. The converged light is emitted outward of the color filter 10 with the optical axis of each lens 1 extending in the z-direction as the center.

[0114] like Figure 1 As shown, in the first embodiment, three lenses 1 are arranged along the long side of each of the first subpixel region P1, the second subpixel region P2, and the third subpixel region P3.

[0115] In the first embodiment, a portion of the outer edge of each lens 1 when viewed from above is arranged without gaps in the x and y directions. Therefore, each lens 1 is densely arranged along the long side directions of the first subpixel region P1, the second subpixel region P2, and the third subpixel region P3. Furthermore, in the first embodiment, they are also densely arranged along the short side directions of the first subpixel region P1, the second subpixel region P2, and the third subpixel region P3.

[0116] However, if the desired light extraction efficiency is achieved, gaps can be formed between the outer edges of each lens 1. To improve light extraction efficiency, a dense arrangement of the lenses 1 is preferred. For example, a preferred dense arrangement is one in which the minimum value of the gap is less than or equal to 20% of the lens size in the width direction of the gap. For example, when gaps are provided between lenses 1 in the y-direction, the width of the gap in the y-direction is more preferably set to the lens outer diameter in the y-direction as Dy, which is less than or equal to 0.20 × Dy.

[0117] Each lens 1 in the first sub-pixel region P1 has a width in the x-direction equal to the width of the short side of the first sub-pixel region P1, and a width in the y-direction that divides the width of the long side of the first sub-pixel region P1 into three equal parts. The top-view shape of each lens 1 is a rectangle with a length of Wx / 3 in the x-direction and Wy / 3 in the y-direction, with rounded corners. Specifically, when Wx = Wy, the top-view shape of each lens 1 can be circular.

[0118] The top-view shapes of each lens 1 in the second sub-pixel region P2 and the third sub-pixel region P3 are also the same.

[0119] When viewed from above, each lens 1 is spaced diagonally. A planar portion F, formed by the upper surface 2a of the planarization layer 2, is formed in the diagonal gap of each lens 1. Each lens 1 is covered by the planarization layer 2 except for the planar portion F.

[0120] Lens 1 is made of a transparent resin material with good transmittance relative to visible light. The material of lens 1 can be the same as or a different material than the planarization layer 2. If the materials of lens 1 and planarization layer 2 are different, their refractive indices can also be different.

[0121] exist Figure 2 , 3 In the example shown, each lens 1 has a plane 1b and a convex lens surface 1a in sequence along the z-direction. Here, plane 1b is the interface relative to the planarization layer 2. However, when the lens 1 and the planarization layer 2 are formed of the same material, no interface is formed between the lens 1 and the planarization layer 2, so plane 1b is a virtual surface. When the refractive indices of the lens 1 and the planarization layer 2 are the same, even if plane 1b is formed, plane 1b will not function as a refractive or reflective surface.

[0122] Unless otherwise stated, the following explanation will use the example of a lens 1 and a planarization layer 2 being made of the same material and having the same refractive index.

[0123] Each lens 1 is a convex lens with positive refractive power on the convex lens surface 1a.

[0124] The shape of each convex lens surface 1a is adopted with consideration of the light-gathering performance and light extraction efficiency of the lens 1. For example, each convex lens surface 1a can be a hemispherical shape that convexes in the z-direction.

[0125] Here, we have the following cases: hemispherical surface including a hemispherical surface, spherical segment with a height less than its radius, and aspherical surface that approximates the aforementioned hemispherical surface and spherical segment.

[0126] Because of this shape, each lens 1 can converge the radiation light emitted by the light-emitting element 5. The optical axis O of each lens 1 extends along the z-direction through the center of each lens 1.

[0127] like Figure 2 As shown, each optical axis O is located at the center of the width (short side width) in the x direction of each light-emitting element 5.

[0128] An organic EL display device 100 is manufactured by forming a light-emitting element 5 on a substrate 6 using a semiconductor manufacturing process, and then stacking a planarization film 4 on the substrate 6 and the light-emitting element 5 to form a main body 9. A filter part 3, a planarization layer 2 and a lens 1 are formed on the planar surface 4a.

[0129] For example, resin compositions in which colorants for forming the first coloring layer 31, the second coloring layer 32, and the third coloring layer 33 are dispersed in a photosensitive resin are prepared, respectively, and cured layers of the respective resin compositions are formed on the flat surface 4a by photolithography in which exposure is performed through a pattern mask and development is performed, whereby the light-filtering portion 3 can be formed.

[0130] For example, after the resin layer in which the planarization layer 2 and the lens 1 are formed on the light-filtering portion 3 is formed, the convex lens surface la of each lens 1 and the shape of the flat portion F are formed on the surface of the resin layer by an etching-back method, whereby the lens 1 can be formed. The planarization layer 2 is formed from a layer portion that is not etched in the resin layer.

[0131] The operation of the organic EL display device 100 will be described with focus on the operation of the color filter 10.

[0132] Figure 4 、 5 is a schematic view for describing the operation of the color filter according to the first embodiment of the present application. Figure 5 is a schematic view for describing the operation of the color filter according to the first embodiment of the present application.

[0133] With regard to the organic EL display device 100, the light-emitting element 5 opposite to the first coloring layer 31 is subjected to light-emission control based on an image signal of a red component (hereinafter referred to as an R signal). Similarly, the light-emitting element 5 opposite to the second coloring layer 32 is subjected to light-emission control based on an image signal of a green component (hereinafter referred to as a G signal), and the light-emitting element 5 opposite to the third coloring layer 33 is subjected to light-emission control based on an image signal of a blue component (hereinafter referred to as a B signal).

[0134] With regard to the unit pixel P, light from the light-emitting element 5 driven by the R signal is emitted to the outside through the first coloring layer 31, light from the light-emitting element 5 driven by the G signal is emitted to the outside through the second coloring layer 32, and light from the light-emitting element 5 driven by the B signal is emitted to the outside through the third coloring layer 33, whereby faithful colors are displayed in the image signal.

[0135] For example, depending on the number of openings of the lens 1, red light from the light-emitting element 5 driven by the R signal is sometimes emitted to the outside through the second sub-pixel region P2 or the third sub-pixel region P3. The leakage light of such red light is converged on the front side by the lens 1, and thus does not cause a change in the color tone of the unit pixel P.

[0136] On the other hand, sometimes red light from the light emitting element 5 driven by the R signal leaks from the second color filter layer 32 and is emitted from the second sub-pixel region P2. In this case, the leaked light emitted based on the R signal is transmitted through the second color filter layer 32 so that the green light component in the leaked light leaks to the outside. As a result, the color tone of the unit pixel P changes due to an increase in the green light component based on the R signal. The inclination of the leaked light with respect to the optical axis O also easily increases depending on the condensing performance of the lens 1, so the change in the color tone is likely to increase the more the unit pixel P is observed from the oblique direction, in particular.

[0137] Figure 4 The light beams in a cross section orthogonal to the y direction are schematically shown in FIG. 6.

[0138] If the light emitting element 5 is lit, the light beams L0Ax (refer to solid arrows) that expand radially from a point A intersecting each optical axis O of the lens 1 opposite to each light emitting element 5 with the optical axis O as the center toward the convex lens surface la opposite in the z direction are emitted.

[0139] The planarization film 4, the light filter portion 3, and the planarization layer 2 have no refractive power, so each light beam L0Ax reaches the convex lens surface la opposite to each light emitting element 5 while diffusing inside in the z direction. In each convex lens surface la, each light beam L0Ax converges according to the respective refractive power and is emitted to the outside of the lens 1 as a light beam L1Ax that is a nearly parallel light beam.

[0140] Likewise, if the light beams L0Bx (refer to dotted arrows) radiating from a point Bx of the end portion of the light emitting element 5 reach the convex lens surface la, they are emitted to the outside of the lens 1 as light beams L1Bx that converge according to the refractive power of the convex lens surface la and that are nearly parallel light beams. At this time, the light beams L1Bx are emitted in an oblique direction corresponding to the distance of the point Bx from the optical axis O according to the condensing performance of the convex lens surface la and in a direction close to the optical axis O according to the refractive power of the convex lens surface la, compared to the case where the convex lens surface la is not present.

[0141] Figure 4 Examples of the light beams emitted from the point Bx of the second color filter layer 32 are shown in FIG. 7, and the same light beams omitted from illustration are also emitted from the first color filter layer 31 and the third color filter layer 33.

[0142] For example, light from the point Bx of the 2nd colored layer 32, as shown by the dotted line L0Dx, is emitted in the z direction, and also in the direction toward the convex lens surface la opposite the 3rd colored layer 33. A large amount of light beams L0Dx are transmitted from the 2nd colored layer 32 and the 3rd colored layer 33, and thus are different from the green light. However, the transmission wavelength ranges of the 2nd colored layer 32 and the 3rd colored layer 33 are different, and thus the amount of transmitted light is lower than that of the light beams L0Bx. The light beams L0Dx that reach the convex lens surface la opposite the 3rd colored layer 33 in the z direction are emitted outside the lens 1 as light beams L1Dx that are parallel light beams close to the direction of inclination toward the x direction.

[0143] However, the light beams L0Bx, L0Dx are radiated light beams from the outer edge of the light emitting element 5, and thus the amount of light itself is lower than that of the center portion. Most of the light beams L1Dx are transmitted from the 3rd colored layer 33 with a blue color, but the amount of light is low, and thus the influence of color mixing is small.

[0144] Radiated from the point Cx of the end portion in the opposite direction of the x direction of each light emitting element 5 and emitted from the convex lens surface la, the light beams are light beams that are symmetrical to the light beams L0Bx, L0Dx, L1Bx, L0Dx with respect to the optical axis O for easy observation.

[0145] The emitted light beams from the lens 1 in the cross section orthogonal to the y direction are light beams that are centered on the optical axis O of the convex lens surface la opposite each light emitting element 5 in the z direction, and have a smaller angle of divergence than the radiated light beams from each light emitting element 5. The color of the emitted light beams from each convex lens surface la corresponds to the transmission wavelength range of the filter portion 3 opposite each convex lens surface la.

[0146] Thus, most of the white light from the light emitting element 5 opposite the 1st colored layer 31 is transmitted from the 1st colored layer 31 and emitted as red light having a wavelength component of red from the lens 1 opposite the 1st colored layer 31 toward the front of the lens 1 (the upper side in the drawing).

[0147] Likewise, most of the white light from the light emitting element 5 opposite the 2nd colored layer 32 is transmitted from the 2nd colored layer 32 and emitted as green light having a wavelength component of green from the lens 1 opposite the 2nd colored layer 32 toward the front of the lens 1.

[0148] Likewise, most of the white light from the light emitting element 5 opposite the 3rd colored layer 33 passes through the 3rd colored layer 33 and is emitted as blue light having a wavelength component of blue from the lens 1 opposite the 3rd colored layer 33 toward the front of the lens 1.

[0149] Figure 5The diagram schematically shows a beam of light passing through point A of the light-emitting element 5, which is opposite to the second color layer 32, and in a cross section orthogonal to the x-direction.

[0150] For ease of use Figure 4 In contrast, in comparison Figure 4 Points A, Bx, and Cx are labeled with points A, By, and Cy at the same locations. Besides the beams radiating from points A and By, beams L0Ay, L1Ay, L0By, L1By, L0Dy, and L1Dy are... Figure 4 The beams L0Ax, L1Ax, L0Bx, L1Bx, L0Dx, and L1Dx are the same beams.

[0151] The beam emitted from lens 1 in the cross-section orthogonal to the x-direction is a beam with a smaller diffusion angle compared to the radiated beam from light-emitting element 5, centered on the optical axis O of each convex lens surface 1a opposite to light-emitting element 5 in the z-direction. The color of the emitted beam from each convex lens surface 1a corresponds to the transmission wavelength range of the filter section 3 opposite to light-emitting element 5. Figure 4 In the example, this corresponds to the transmission wavelength range of the second coloring layer 32.

[0152] exist Figure 5 In this case, for example, light beams L0Dy and L1Dy only pass through the second color layer 32, so the amount of light is not reduced and it is emitted as green light. Therefore, light beam L1Dy does not contribute to color mixing.

[0153] Thus, in the first embodiment, the lens 1 has multiple lenses arranged above each sub-pixel that are longer in the y-direction, thereby suppressing the diffusion of the light beam in the y-direction, just as it does in the x-direction. As a result, the front brightness of the unit pixel P is improved.

[0154] Regarding this point, with Figure 6 , 7 The existing example 1 is shown for comparison.

[0155] Figure 6 This is a schematic top view illustrating an example of the display device of Example 1. Figure 7 It is along Figure 6 A sectional view along line F7-F7 in the diagram.

[0156] like Figure 6 , 7 As shown, the existing organic EL display device 110 of Example 1 has a lens 111 instead of the lens 1 of the organic EL display device 100, and is otherwise constructed in the same manner as the organic EL display device 100. Hereinafter, the differences from the first embodiment will be described in detail.

[0157] like Figure 7As shown, the lens 111 is arranged opposite to the first color layer 31, the second color layer 32 and the third color layer 33 through the planarization layer 2, respectively, so as to converge the light transmitted from the first color layer 31, the second color layer 32 and the third color layer 33.

[0158] like Figure 6 As shown, lens 111 is provided with one lens along the long side of each of the first subpixel region P1, the second subpixel region P2, and the third subpixel region P3.

[0159] The lens 111 of the first sub-pixel region P1 has a width in the x-direction the same as the width of the short side of the first sub-pixel region P1, and a width in the y-direction the same as the width of the long side of the first sub-pixel region P1. The top view of the lens 111 has a rectangular shape with rounded corners.

[0160] The top-view shapes of each lens 111 in the second sub-pixel region P2 and the third sub-pixel region P3 are also the same.

[0161] The shape of each lens 111 in the cross section orthogonal to the y direction is the same as the shape of the convex lens surface 1a of that cross section.

[0162] Regarding the shape of each lens 111 in the cross-section orthogonal to the x-direction, as follows: Figure 7 As shown, a plane 111b and a lens surface 111a are formed sequentially in the z-direction.

[0163] Plane 111b is formed by the boundary surface relative to planarization layer 2.

[0164] The lens surface 111a has: a convex surface 111aB formed at both ends of the lens 111 along its long side; and a cylindrical surface 111aA extending along the x-direction in the region clamped by each convex surface 11aB.

[0165] The cylindrical surface 111aA is formed as a convex lens surface 1a, and the shape of the cross section orthogonal to the x direction extends along the x direction.

[0166] The convex surface 111aB is a quarter-sphere that is smoothly connected to the cylindrical surface 111aA.

[0167] Lens surface 111a has the same refractive power as convex lens surface 1a in a cross section orthogonal to the y direction, but has no refractive power in a cross section orthogonal to the x direction except for convex surface 111aB.

[0168] Therefore, as Figure 7 As shown by the solid and dashed lines, the beam of light from the radiation beam of the light-emitting element 5 that passes through the cylindrical surface 111aA does not converge in the x-direction, but is emitted from the lens 111.

[0169] As a result, compared with the first embodiment, the field of view in the cross section orthogonal to the y direction is diffused in accordance with the diffusion of the light beam, but the brightness in each observation direction in the cross section is reduced compared with the first embodiment.

[0170] That is, regarding the organic EL display device 110 of the existing Example 1, the brightness on the front side decreases, and the brightness corresponding to the viewing angle when viewed from an oblique direction in a cross-section orthogonal to the y-direction also decreases. As a result, the image becomes darker, and therefore visual confirmability decreases.

[0171] In contrast, the organic EL display device 100 of the first embodiment has a color filter 10 with a plurality of lenses 1 arranged in the long side direction of each sub-pixel, thus providing good front brightness and visual visibility.

[0172] [Second Implementation]

[0173] The color filter and display device according to the second embodiment of the present invention will be described.

[0174] Figure 8 This is a schematic top view illustrating an example of a display device according to the second embodiment of the present invention.

[0175] Figure 9 It is along Figure 8 A sectional view of line F9-F9 in the diagram.

[0176] like Figure 8 , 9 As shown, the organic EL display device 100A (display device) of the second embodiment replaces the color filter 10 of the first embodiment and has the color filter 10A of the second embodiment. The color filter 10A replaces the filter section 3 and has a filter section 3A.

[0177] The following description focuses on the differences from the first embodiment.

[0178] The filter section 3A has a light-shielding wall 7A that blocks visible light, in addition to the filter section 3.

[0179] The light-shielding walls 7A are respectively disposed between adjacent sub-pixels in the x-direction of adjacent unit pixels P, and between adjacent sub-pixels in the x-direction of unit pixels P.

[0180] The shape of the light-shielding wall 7A is not particularly limited as long as it can be positioned across adjacent subpixels in the x-direction to block at least a portion of the transmitted light.

[0181] For example, in Figure 8 , 9In the example shown, 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 sub-pixel. The upper surface 7a of the light-shielding wall 7A lies on the same plane as the upper surface 3a of the filter section 3A.

[0182] The x-width t of the light-shielding wall 7A is set to an appropriate size to achieve the desired light-shielding characteristics. However, the smaller t is, the better. For example, t can be greater than or equal to 30% of Wx / 3 and less than or equal to 40%.

[0183] The material of the light-shielding wall 7A is not particularly limited as long as it can block visible light. For example, the material of the light-shielding wall 7A can be a material with a visible light transmittance greater than or equal to 0% and less than or equal to 20%. The light-shielding wall 7A can be formed, for example, from a resin material in which black pigments such as carbon are dispersed.

[0184] Except for the width wx, the first color layer 31, the second color layer 32, and the third color layer 33 of the second embodiment are the same as those of the sub-pixels in the first embodiment. The size of wx is (Wx / 3-t). Therefore, the aspect ratio of each sub-pixel in the second embodiment is Wy / wx.

[0185] 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 range, the aspect ratio is greater than or equal to 4.2 and less than or equal to 5.

[0186] The resin composition for forming the light-shielding wall 7A is patterned by photolithography using the same method as that for forming the first coloring layer 31, the second coloring layer 32, and the third coloring layer 33, thereby enabling the fabrication of the filter portion 3A.

[0187] The organic EL display device 100A according to the second embodiment has a color filter 10A in which a plurality of lenses 1 are arranged in the long side direction of each sub-pixel. Therefore, like the first embodiment, it has good front brightness and visual visibility.

[0188] In particular, the filter section 3A of the color filter 10A has a light-shielding wall 7A between subpixels, so that the light beam emitted from the lens 1 can be blocked through the boundary between the subpixels.

[0189] For example, such as Figure 9 As shown, consider the rays R1, R2, and R3 that are incident on the first color layer 31 and travel in the x direction and then in the z direction.

[0190] Light rays R1 and R2 emitted from the end of the light-emitting element 5 opposite to the x-direction pass through the planarization layer 2, which is closer to the upper side of the diagram than the light-shielding wall 7A, and are emitted outward from the lens 1 opposite to the second coloring layer 32. On the other hand, light rays that are incident at a position closer to the x-direction than light ray R2, such as light ray R3, are absorbed by the light-shielding wall 7A and therefore do not emit outward.

[0191] Therefore, compared with the first embodiment, it is possible to further suppress the hue changes caused by color mixing.

[0192] [First Variation]

[0193] The color filter and display device according to the first modification of the second embodiment of the present invention will be described.

[0194] Figure 10 This is a schematic top view illustrating an example of a display device according to a first variation of the second embodiment of the present invention. Figure 11 It is along Figure 10 A sectional view along line F11-F11 in the diagram.

[0195] like Figure 10 As shown, the organic EL display device 100B (display device) of the first modified example replaces the color filter 10A of the second embodiment and has the color filter 10B of the second embodiment.

[0196] A color filter 10B replaces the filter section 3A and has a filter section 3B.

[0197] The following description focuses on the differences from the second embodiment.

[0198] The filter section 3B replaces the light-shielding wall 7A of the filter section 3A and has a light-shielding wall 7B.

[0199] The light-shielding wall 7B is formed as a column extending along the z-direction, with the upper surface 7aB (refer to) in the extending direction. Figure 11 It is positioned opposite to each planar part F.

[0200] Therefore, the light-shielding wall 7B is arranged in a grid pattern, with adjacent sub-pixels in the x-direction and adjacent sub-pixels in the x-direction within the unit pixel P, and separated from each other in the x and y directions.

[0201] The shape of the light-shielding wall 7B is not particularly limited as long as it can block at least a portion of the light from the light-emitting element 5 toward the flat part F.

[0202] For example, in Figure 10 , 11In the example shown, the x-width of each light-shielding wall 7B is tx, and the y-width is ty.

[0203] The height of each light-shielding 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 and the upper surface 3a of the filter part 3B are located on the same plane.

[0204] The x-width tx and y-width ty of the light-shielding wall 7B are set to appropriate sizes to achieve the desired light-shielding characteristics. For example, tx and ty can be sizes that can cover the planar portion F by a range greater than or equal to 70% and less than or equal to 100% when viewed from above.

[0205] The material used for the light-shielding wall 7B is the same as that used for the light-shielding wall 7A.

[0206] Except that the x-width wF of the portion held by the light-shielding walls 7B opposite each other in the x-direction is reduced by (Wx / 3-tx), the first color layer 31, the second color layer 32 and the third color layer 33 of the second embodiment are the same as each sub-pixel of the first embodiment.

[0207] As in the second embodiment, when the shape of the sub-pixel differs from that of a rectangle, the ratio of the maximum length of the long side of the sub-pixel to the maximum length of the short side is defined as the aspect ratio. Therefore, the aspect ratio of each sub-pixel in the second embodiment is the same as that in the first embodiment.

[0208] Except that the top view formation area of ​​the light-shielding wall 7B is different from that of the light-shielding wall 7A, the color filter 10B can be manufactured in the same way as the color filter 10A in the second embodiment.

[0209] According to the first modified example, the organic EL display device 100B has a color filter 10B in which a plurality of lenses 1 are arranged in the long side direction of each sub-pixel. Therefore, similar to the first embodiment, the front brightness and visual visibility are good.

[0210] In particular, the filter portion 3B of the color filter 10B has a light-shielding wall 7B between subpixels, so that a portion of the light beam emitted from the planar portion F can be blocked through the boundary between the subpixels.

[0211] For example, such as Figure 11 As shown, consider the rays R4 and R5 that are incident on the first color layer 31 and travel in the x direction and then in the z direction.

[0212] The light rays R4 emitted from the end of the light-emitting element 5 opposite to the x-direction pass through the planarization layer 2, which is closer to the upper side of the diagram than the light-shielding wall 7B, and are emitted outward from the planar portion F.

[0213] On the other hand, the light R5 emitted from the end of the light-emitting element 5 in the x direction is absorbed by the light-shielding wall 7B and therefore does not emit to the outside.

[0214] If leakage light is generated from the planar portion F, it is not focused by lens 1, and therefore the leakage light is emitted in a direction with a large angle relative to the optical axis O. As a result, the hue changes when viewing a unit pixel P from an angled direction.

[0215] According to the first modified example, leakage light from the planar portion F can be reduced, and the hue change caused by color mixing can be further suppressed compared with the first embodiment.

[0216] [Second Variation]

[0217] The color filter and display device according to the second variation of the second embodiment of the present invention will be described.

[0218] Figure 12 This is a schematic top view illustrating an example of a display device according to a second variation of the second embodiment of the present invention.

[0219] like Figure 12 As shown, the organic EL display device 100C (display device) of the second modified example replaces the color filter 10A of the second embodiment and has the color filter 10C of the second embodiment.

[0220] A color filter 10C replaces the filter section 3A and has a filter section 3C.

[0221] The following description focuses on the differences from the second embodiment.

[0222] The filter section 3C replaces the light-shielding wall 7A of the filter section 3A and has a light-shielding wall 7C.

[0223] Except that the height hC from the flat surface 4a to the upper surface 7aC is less than the thickness of each sub-pixel, the light-shielding wall 7C is the same as the light-shielding wall 7A in the second embodiment.

[0224] The size of hC can be set to an appropriate size that matches the required light-blocking range. For example, it is more preferable that hC is greater than half the thickness of each subpixel.

[0225] Except that the height of the light-shielding wall 7C is different from that of the light-shielding wall 7A, the color filter 10C can be manufactured in the same manner as the color filter 10A in the second embodiment. However, in the second modification, after the light-shielding wall 7C is formed, the first color layer 31, the second color layer 32, and the third color layer 33 are formed.

[0226] According to the second modified example, the organic EL display device 100C has the same function as the second embodiment, except that the light-shielding range of the light-shielding wall 7C is smaller than that of the second embodiment.

[0227] According to the second variation, for example, such as Figure 12 As shown, when light ray R6 passes through the boundary between the first color layer 31 and the second color layer 32 at a position higher than the light-shielding wall 7C, it is not blocked by the light-shielding wall 7C. Therefore, light ray R6 passes through the planarization layer 2 and is emitted outward from the lens 1 opposite to the second color layer 32.

[0228] However, if the height hC of the light-shielding wall 7C is greater than or equal to half the thickness of the subpixel, for example, when the slope relative to the optical axis O of light ray R6 is less than or equal to 45°, the length of the light path passing through the second color layer 32 is less than the length of the light path passing through the first color layer 31. In this case, light ray R6 carries a red tint, and therefore, compared to the case where light ray R6 transforms into green light, there is less hue change caused by color mixing.

[0229] [3rd Variation]

[0230] The color filter and display device according to the third variation of the second embodiment of the present invention will be described.

[0231] Figure 13 This is a schematic top view illustrating an example of a display device according to a third variation of the second embodiment of the present invention.

[0232] like Figure 13 As shown, the organic EL display device 100D (display device) of the third modified example replaces the color filter 10A of the second embodiment and has the color filter 10D of the second embodiment.

[0233] A color filter 10D replaces the planarization layer 2 and the filter section 3A, thus having a planarization layer 2D and a filter section 3D.

[0234] The following description focuses on the differences from the second embodiment.

[0235] The third variation is an example in which the light-shielding wall 7A of the second embodiment extends into the interior of the planarization layer 2.

[0236] The filter section 3D replaces the light-shielding wall 7A of the filter section 3A and has a light-shielding wall 7D.

[0237] Except that the height h from the flat surface 4a to the upper surface 7aD is greater than the thickness of each sub-pixel and less than or equal to the sum of the thickness of each sub-pixel and the thickness of the planarization layer 2D, the light-shielding wall 7D is the same as the light-shielding wall 7A in the second embodiment.

[0238] Except for the light-shielding wall 7D extending into the interior, the planarization layer 2D is the same as the planarization layer 2 in the second embodiment.

[0239] Except that the height of the light-shielding wall 7D is different from that of the light-shielding wall 7A, the color filter 10D can be manufactured in the same way as the filter section 3A in the second embodiment.

[0240] According to the third modified example, the organic EL display device 100D has the same function as the second embodiment, except that the light-shielding range of the light-shielding wall 7D is larger than that of the second embodiment.

[0241] According to the third variation, for example, in addition to being able to block light rays such as light rays R3 that cross the boundary surface of adjacent sub-pixels, it is also possible to block at least a portion of the light that passes through the planarization layer 2D and is emitted from the lens 1 opposite to the adjacent sub-pixel.

[0242] For example, if the size of hD is set appropriately to block out an amount equivalent to... Figure 9 The light ray R7 of the light ray R1 shown can completely block the light that passes through the first color layer 31 and is emitted outward from the convex lens surface 1a opposite to the adjacent subpixel.

[0243] [4th Variation]

[0244] The color filter and display device according to the fourth variation of the second embodiment of the present invention will be described.

[0245] Figure 14 This is a schematic top view illustrating an example of a display device according to a fourth variation of the second embodiment of the present invention.

[0246] like Figure 14 As shown, the organic EL display device 100E (display device) of the fourth modified example replaces the color filter 10A of the second embodiment and has the color filter 10E of the second embodiment.

[0247] A color filter 10ED replaces the planarization layer 2 and the filter section 3A, and has a planarization layer 2E and a filter section 3. The filter section 3 is a layered section similar to that in the first embodiment, and no light-shielding wall is provided.

[0248] The following description focuses on the differences from the second embodiment.

[0249] Except for the formation of a light-shielding wall 7E inside, the planarization layer 2E is the same as the planarization layer 2 in the second embodiment.

[0250] The light-shielding wall 7E extends from the upper surface 3a on the boundary of each sub-pixel into the interior of the planarization layer 2E.

[0251] After forming the filter section 3 in the same manner as in the first embodiment, a light-shielding wall 7E is formed on the upper surface 3a in the same manner as in the second embodiment. A planarization layer 2E and a lens 1 are formed on the upper surface 3a and the light-shielding wall 7E, thereby enabling the manufacture of a color filter 10E.

[0252] According to the fourth modified example, the organic EL display device 100E has the same function as the second embodiment, except that it uses the light-shielding wall 7E to block light that passes through a portion of the planarization layer 2E.

[0253] According to the fourth variation, for example, light that passes through a position higher than the boundary of each sub-pixel and is emitted from the convex lens surface 1a opposite to the sub-pixel adjacent in the x direction can be blocked, as with light rays R8 and R9.

[0254] According to the fourth modification, after the light filter 3 is formed, the light shield 7E is formed separately. Therefore, compared with the case where the light shield 7E is formed together, the manufacturing of the light filter 3 becomes easier.

[0255] [Third Implementation]

[0256] The color filter and display device according to the third embodiment of the present invention will be described.

[0257] Figure 15 This is a schematic top view illustrating an example of a display device according to the third embodiment of the present invention. Figure 16 It is along Figure 15 A sectional view along line F15-F15 in the diagram. Figure 17 It is along Figure 15 A sectional view along line F16-F16 in the diagram.

[0258] Figure 15 The OLED display device 100F (display device) of the third embodiment shown has rectangular unit pixels P10 in view of the OLED display device 100 of the first embodiment, replacing the unit pixels P. The application of the OLED display device 100F is not particularly limited. For example, similar to the OLED display device 100, the OLED display device 100F can be used as a display device for electronic instruments such as smart glasses, head-mounted displays, and electronic viewfinders.

[0259] The following description focuses on the differences from the first embodiment.

[0260] The x-width of a unit pixel P10 is Wx, and the y-width is Wy. Specifically, when Wx = Wy, the top-view shape of a unit pixel P10 is a square.

[0261] Unit pixel P10 has a first subpixel region P11, a second subpixel region P12, and a third subpixel region P13. The second subpixel region P12 and the first subpixel region P11 are arranged sequentially in the y-direction. The third subpixel region P13 is arranged adjacent to the first subpixel region P11 and the second subpixel region P12 on their respective x-direction sides.

[0262] The first subpixel region P11 is a rectangle with a width of Wx / 2 and a width of Wy / 2 when viewed from above.

[0263] The first subpixel region P11, for example, is displayed in red.

[0264] The second subpixel region P12 is a rectangle with a width of Wx / 2 and a width of Wy / 2 when viewed from above.

[0265] The second subpixel region P12, for example, is displayed in green.

[0266] The third subpixel region P13 is a slender rectangle with a width of Wx / 2 and a width of Wy when viewed from above. The third subpixel region P13 is, for example, displayed in blue.

[0267] like Figure 16 As shown, the organic EL display device 100F has a main body 19 and a color filter 10F.

[0268] The main body 19 replaces the light-emitting element 5 of the main body 9 in the first embodiment and has a light-emitting element 15.

[0269] Except for the different top-view shape, the light-emitting element 15 is the same as the light-emitting element 5 in the first embodiment. The light-emitting element 15 includes: a light-emitting element 15A disposed in the first sub-pixel region P11 and the second sub-pixel region P12; and a light-emitting element 15B disposed in the third sub-pixel region P13. For example, an organic EL element can be used as the light-emitting element 15.

[0270] like Figure 15 As shown, the top view shape of each light-emitting element 15A is a rectangle that is slightly smaller than the shape of the configured first sub-pixel region P11 and the second sub-pixel region P12.

[0271] The top view shape of the light-emitting element 15B is a rectangle that is slightly smaller than the shape of the configured third sub-pixel region P13.

[0272] The color filter 10F replaces the filter portion 3 of the color filter 10 in the first embodiment and has a filter portion 13.

[0273] The filter section 13 replaces the first color layer 31, the second color layer 32 and the third color layer 33 of the filter section 3 and has a first color layer 41 (sub-pixel, second sub-pixel), a second color layer 42 (sub-pixel, second sub-pixel) and a third color layer 43 (sub-pixel, elongated pixel, first sub-pixel).

[0274] The first color layer 41 overlaps with the first sub-pixel region P11. The first color layer 41, for example, forms a sub-pixel with a red transmission wavelength range.

[0275] like Figure 15 As shown, the second color layer 42 is disposed adjacent to the first color layer 41 along the y-direction. The second color layer 42 overlaps with the second sub-pixel region P12. The second color layer 42, for example, forms a sub-pixel with a green transmission wavelength range.

[0276] The top view shape of the first shading layer 41 and the second shading layer 42 is a rectangle with an x-width of Wx / 2 and a y-width of Wy / 2.

[0277] The third color layer 43 overlaps with the third sub-pixel region P13. The third color layer 43, for example, forms a sub-pixel with a blue transmission wavelength range.

[0278] The first shading layer 41 and the second shading layer 42 are adjacent along one side of the long side of the third shading layer 43. The top view shape of the third shading layer 43 is a long, thin rectangle with a width of Wx / 2 (x-width) and a width of Wy (y-width). Therefore, the aspect ratio of the third shading layer 43 is 2 × Wy / Wx, which is greater than 1. Thus, the third shading layer 43 consists of long, thin pixels. For example, if the unit pixel P is a square (Wx = Wy), the aspect ratio of the third shading layer 43 is 2.

[0279] In contrast, the aspect ratio of the first color layer 41 and the second color layer 42 adjacent to the third color layer 43 is half that of the third color layer 43, which is smaller than the third color layer 43.

[0280] Thus, in the three sub-pixels of the filter section 13, the first color layer 41 and the second color layer 42 respectively form the first sub-pixel and the second sub-pixel. The first sub-pixel and the second sub-pixel are rectangular and have two first transmission wavelength ranges and two second transmission wavelength ranges of red, green and blue.

[0281] The third color layer 43 forms the third sub-pixel. The third sub-pixel is an elongated pixel with an aspect ratio greater than that of the first and second sub-pixels, and is a sub-pixel with a third wavelength range of red, green and blue that is different from the first and second wavelength ranges.

[0282] Aside from the different top-view shape and configuration of the subpixels, the filter section 13 is formed in the same way as the filter section 3.

[0283] Except that four lenses are arranged within a unit pixel P10, the lens 1 in the third embodiment is the same as the lens 1 in the first embodiment.

[0284] Therefore, in the third embodiment, one lens 1 is provided in the first subpixel region P11 and the second subpixel region P12, and two lenses are provided in the third subpixel region P13.

[0285] Each lens 1 is configured to face the first colored layer 41, the second colored layer 42, and the third colored layer 43 respectively, separated by the planarization layer 2. In particular, the two lenses 1 facing the third colored layer 43 are arranged in the y-direction, which is the long side direction of the third colored layer 43.

[0286] Each lens 1 may form a gap with an adjacent lens 1, but in the third embodiment, as in the first embodiment, they are densely arranged in such a way that a portion of their outer edges are in contact with each other.

[0287] Each lens 1 has a flat portion F formed in the diagonal direction, the same as in the first embodiment.

[0288] The color filter 10F in the third embodiment is an example in which two lenses are arranged opposite to the elongated pixels.

[0289] The organic EL display device 100F of the third embodiment has a color filter 10F in which a plurality of lenses 1 are arranged in the long side direction of the third color layer 43. Therefore, like the first embodiment, it has good front brightness and visual visibility.

[0290] Furthermore, in the above embodiments and variations, examples were described using elongated pixels with an aspect ratio equal to or close to 3 or 2. However, it is not particularly limited as long as the aspect ratio of the elongated pixels is greater than 1.

[0291] Regarding the number of lenses opposite the elongated pixels, there is no particular limitation if they can be densely arranged along the long side of the elongated pixels. However, when the aspect ratio of the elongated pixels is greater than or equal to 1.5, it is more preferable to set the number of lenses to the number obtained by rounding to the first decimal place of the aspect ratio.

[0292] In this case, the ratio of the length of the lens along its major axis to its length along its minor axis when viewed from above can be set to a value close to 1, thus making it easier to reduce the anisotropy of the light-gathering performance.

[0293] In the above embodiments and variations, 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 organic EL elements. For example, inorganic LED elements can be cited as examples of light-emitting elements.

[0294] In the above embodiments and variations, examples were described using red, green, and blue subpixels arranged in the first, second, and third subpixel regions, respectively. However, if color display is possible within a single pixel, the color and arrangement position of the subpixels are not limited thereto.

[0295] [Fourth Implementation]

[0296] The color filter and display device according to the fourth embodiment of the present invention will be described.

[0297] Figure 18 This is a schematic top view illustrating an example of a display device according to the fourth embodiment of the present invention.

[0298] Figure 19 It is along Figure 18 A sectional view of line F202-F202 in the image.

[0299] Figure 18 The illustrated OLED display device 200 (display device) displays color images based on image signals. The application of the OLED display device 200 is not particularly limited. For example, the OLED display device 200 can be used as a display device for electronic instruments such as smart glasses, head-mounted displays, and electronic viewfinders.

[0300] Figure 18 The diagram shows the structure of a unit pixel P of the organic EL display device 200 according to the fourth embodiment when viewed from above. Here, "viewing from above" means viewing from the display screen of the organic EL display device 200 toward the light-emitting element. Sometimes, "viewing from above" also refers to viewing from the thickness direction of the filter section 203, which will be described later.

[0301] A unit pixel P is the smallest area for color display. For example, regarding an organic EL display device 200, multiple... Figure 18 The unit pixels P shown are arranged adjacently in the x-direction (left to right) and the y-direction (bottom to top). The z-direction is the direction perpendicular to both the x and y directions, shown in the diagram as the direction from the inside of the paper towards the front. The z-direction is the direction opposite to the top-view direction.

[0302] The shape of the display screen formed by all unit pixels P in the organic EL display device 200 is a rectangle with sides in the x and y directions. The width of each unit pixel P in the x direction is Wx, and the width in the y direction is Wy. Wx and Wy can be equal or different.

[0303] For example, in Figure 18 In the example shown, Wx is 1.5 times Wy.

[0304] For simplicity, the width of a region, component, etc. in the x-direction is sometimes referred to as the x-width, and the width in the y-direction is referred to as the y-width.

[0305] A unit pixel P has a first subpixel region P201, a second subpixel region P202, and a third subpixel region P203. The first subpixel region P201, the second subpixel region P202, and the third subpixel region P203 are arranged sequentially in the x-direction. The first subpixel region P201, the second subpixel region P202, and the third subpixel region P203 divide the unit pixel P into three equal parts in the x-direction.

[0306] Regarding the organic EL display device 200, the structure of each unit pixel P is the same, so the following explanation uses an example of a single unit pixel P.

[0307] When viewed from above, the first subpixel region P201 is a rectangle with an x-width of Wx / 3 and a y-width of Wy. The first subpixel region P201 is, for example, displayed in red.

[0308] When viewed from above, the second subpixel region P202 is a rectangle with an x-width of Wx / 3 and a y-width of Wy. The second subpixel region P202 is, for example, displayed in green.

[0309] When viewed from above, the third subpixel region P203 is a rectangle with an x-width of Wx / 3 and a y-width of Wy. The third subpixel region P203, for example, is displayed in blue.

[0310] like Figure 19 As shown, the organic EL display device 200 has a main body 209 and a color filter 210.

[0311] The main body 209 includes a substrate 206, a light-emitting element 205, and a planarization film 204.

[0312] The top view of substrate 206 is larger than the display screen of organic EL display device 200. Substrate 206 is formed, for example, from a silicon substrate.

[0313] The light-emitting element 205 emits white light. For example, an organic EL element can be used as the light-emitting element 205. In an organic EL element, a DC voltage is applied between the anode and the cathode to inject electrons and holes into the light-emitting layer, causing them to recombine and generate excitons. Light is emitted by releasing light when these excitons are deactivated.

[0314] The light-emitting elements 205 are respectively disposed in the first sub-pixel region P201, the second sub-pixel region P202 and the third sub-pixel region P203.

[0315] like Figure 18 As shown, the top view shape of each light-emitting element 205 is a rectangle that is slightly smaller than the shape of the configured first sub-pixel region P201, second sub-pixel region P202, and third sub-pixel region P203.

[0316] exist Figure 18 In the example shown, the x-width of each light-emitting element 205 is slightly smaller than Wx / 3, and the y-width is slightly smaller than Wy.

[0317] For example, a light-emitting element 205 is fabricated on a silicon substrate using semiconductor manufacturing processes.

[0318] The electrodes of each light-emitting element 205 are connected to a driving circuit (not shown) via wiring formed on the substrate 206. The driving circuit controls the lighting and extinguishing of each light-emitting element 205 based on an image signal.

[0319] like Figure 19 As shown, the planarization film 204 covers at least the substrate 206 of each unit pixel P and the light-emitting element 205, forming a planar surface 204a in the z-direction. The planar surface 204a is a plane extending over the entire display area of ​​the organic EL display device 200.

[0320] The planarization film 204 covers and protects the light-emitting element 205. For example, the planarization film 204 prevents moisture, oxygen, etc. from contacting the light-emitting element 205, thereby suppressing the deterioration of the light-emitting element 205.

[0321] The planarization film 204 is made of a transparent resin material with good transmittance relative to visible light. For the material of the planarization film 204, it is more preferable to use a material with high barrier properties against at least one of moisture and oxygen.

[0322] The thickness of the planarization film 204 on the light-emitting element 205 is, for example, 0.1 μm.

[0323] The color filter 210 has a filter section 203, a planarization layer 202 and a lens 201 in sequence in the z direction.

[0324] The filter section 203 is a layered section with an upper surface 203a and a lower surface 203b and a thickness t1. The conditions that t1 must satisfy will be described later.

[0325] The planarization film 204 is covered by the filter section 203 with the lower surface 203b in close contact with the planar surface 204a.

[0326] The filter section 203 restricts the transmission wavelength of light incident from each light-emitting element 205 via the planarization film 204.

[0327] The filter unit 203 is composed of a first color layer 231 (subpixel), a second color layer 232 (subpixel), and a third color layer 233 (subpixel).

[0328] The first color layer 231 overlaps with the first sub-pixel region P201. The first color layer 231, for example, forms a sub-pixel with a red transmission wavelength range.

[0329] The second color layer 232 is disposed adjacent to the first color layer 231 in the x-direction. The second color layer 232 overlaps with the second sub-pixel region P202. The second color layer 232 forms, for example, a sub-pixel with a green transmission wavelength range.

[0330] The third color layer 233 is disposed adjacent to the second color layer 232 in the x-direction. The third color layer 233 overlaps with the third sub-pixel region P203. The third color layer 233, for example, forms a sub-pixel with a blue transmission wavelength range.

[0331] In the fourth embodiment, the top-view shapes of the first color layer 231, the second color layer 232, and the third color layer 233, viewed from the thickness direction, are elongated rectangles in the y-direction, and are identical to the shapes of the first sub-pixel region P201, the second sub-pixel region P202, and the third sub-pixel region P203, respectively. Therefore, the first color layer 231, the second color layer 232, and the third color layer 233, which form three sub-pixels, are formed in a shape that divides the unit pixel P into three equal parts in the x-direction.

[0332] The width of each of the first shading layer 231, the second shading layer 232, and the third shading layer 233 is wx (=Wx / 3), and the width of each of the y layers is Wy.

[0333] A filter section 203 is formed by curing a resin composition in which colorants corresponding to their respective transmission wavelength ranges are dispersed in a transparent resin.

[0334] The planarization layer 202 is a layered portion of thickness t2 stacked on the upper surface 203a of the filter section 203. The conditions that t2 must satisfy will be described later.

[0335] The upper surface 202a of the planarization layer 202 is a plane parallel to the lower surface 203b of the filter section 203.

[0336] The planarization layer 202 is made of a transparent resin material with good transmittance relative to visible light.

[0337] Lenses 201 are arranged opposite each other in the thickness direction (z-direction) of the first color layer 231, the second color layer 232, and the third color layer 233, separated by a planarization layer 202, and converge the light transmitted from the first color layer 231, the second color layer 232, and the third color layer 233, respectively. The converged light is emitted outward of the color filter 210 with the optical axis of each lens 201 extending in the z-direction as the center.

[0338] like Figure 18 As shown, in the fourth embodiment, two lenses 201 are arranged along the long side (y-direction) of each of the first sub-pixel region P201, the second sub-pixel region P202, and the third sub-pixel region P203. However, the number of lenses 201 along the long side of the first sub-pixel region P201, the second sub-pixel region P202, and the third sub-pixel region P203 can be appropriately changed according to the length of the long side.

[0339] The y-width of each lens 201 is Ly. The distance between adjacent lenses 201 in the y-direction is dy. From the viewpoint of improving light extraction efficiency, it is preferable to have a smaller dy. For example, dy can be 0.

[0340] exist Figure 18 In the example shown, the y-width Ly of each lens is (Wy / 2-dy).

[0341] The x-width of each lens 201 is Lx. The distance between adjacent lenses 201 in the x-direction is dx. The conditions that Lx and dx satisfy will be described later.

[0342] For example, the top view shape of each lens 201 is a rectangle with a width of Lx and a width of Ly, with rounded corners. In particular, when Lx = Ly, the top view shape of each lens 201 can be circular.

[0343] In the fourth embodiment, when viewed from above, gaps are separated at least in the x-direction and in the diagonal direction of each lens 201, exposing the upper surface 202a of the planarization layer 202.

[0344] Lens 201 is made of a transparent resin material with good transmittance relative to visible light. The material of lens 201 can be the same as or a different material from the planarization layer 202. If the materials of lens 201 and planarization layer 202 are different, their refractive indices can also be different.

[0345] exist Figure 19 In the example shown, each lens 201 has a plane 201b and a convex lens surface 201a in sequence along the z-direction. Here, the plane 201b is the interface relative to the planarization layer 202. However, when the lens 201 and the planarization layer 202 are formed of the same material, no interface is formed between the lens 201 and the planarization layer 202, therefore the plane 201b is a virtual surface. When the refractive index of the lens 201 and the planarization layer 202 is the same, even if the plane 201b is formed, the plane 201b will not function as a refractive or reflective surface.

[0346] Unless otherwise stated, the following explanation will use the example of a lens 201 and a planarization layer 202 being formed of the same material, and the refractive indices of the lens 201 and the planarization layer 202 being equal to each other.

[0347] Each lens 201 is a convex lens with positive refractive power on the convex lens surface 201a.

[0348] The shape of each convex lens surface 201a is adopted with consideration of the light-gathering performance and light extraction efficiency of the lens 201. For example, each convex lens surface 201a can be a hemispherical shape that convexes in the z-direction.

[0349] Here, the cases include hemispherical shapes containing hemispherical surfaces, spherical cross-sections with heights less than their radii, and those approaching the aforementioned hemispherical surfaces and spherical cross-sections.

[0350] With this shape, each lens 201 can converge the radiated light emitted by the light-emitting element 205. The optical axis O of each lens 201 extends in the z-direction through the center of each lens 201.

[0351] like Figure 19 As shown, each optical axis O is located at the center of the width (short side width) in the x direction of each light-emitting element 205.

[0352] Regarding the color filter 210 of the fourth embodiment, when a specific subpixel having a first transmission wavelength range is called a first subpixel, a subpixel adjacent to the first subpixel and having a second transmission wavelength range different from the first transmission wavelength range is called a second subpixel, and the lens 201 opposite to the first subpixel and the second subpixel is called a first lens and a second lens respectively, their respective shapes are formed to satisfy the following formulas (1) to (5).

[0353] [Mathematical Expression 2]

[0354] T = t1 + t2...(1)

[0355] w>T...(2)

[0356] d=2×(wT)...(3)

[0357] 0.8×W≤L<w...(4)

[0358] L=wd...(5)

[0359] Here, t1 is the thickness of the first sub-pixel and the second sub-pixel, t2 is the thickness of the planarization layer 202, w is the width of the first sub-pixel and the second sub-pixel in adjacent directions, L is the width of the first lens and the second lens in adjacent directions, and d is the distance between the first lens and the second lens in adjacent directions.

[0360] As shown in equation (1), T represents the total thickness of the filter section 203 and the planarization layer 202. Regarding the filter section 203 and the planarization layer 202, the light emitted from the light-emitting element 205 is refracted according to the refractive index difference between the filter section 203 and the second lens, and when the refractive index difference is small, it travels approximately in a straight line.

[0361] Equation (2) sets the total thickness T of the filter section 203 and the planarization layer 202 to be less than the width w of each of the first sub-pixel and the second sub-pixel. If T is greater than or equal to w, the focusing range of the radiated light from the light-emitting element 205 based on the first lens and the second lens is reduced, thus the front brightness decreases.

[0362] On the other hand, if light with a large radiation angle is easily converged, the proportion of leaked light radiated from the end of the first sub-pixel that passes through the adjacent second sub-pixel and exits from the second lens towards the front increases. In this case, the leaked light passing through the second sub-pixel carries a hue different from the first transmission wavelength range of the first sub-pixel. If the leaked light carrying a hue different from the first transmission wavelength range is observed together, color reproducibility may decrease due to the amount of leaked light.

[0363] In the fourth embodiment, the leaked light is not easily emitted in the front direction, so there is a distance between the first lens and the second lens in adjacent directions, thereby forming a gap between the lenses.

[0364] Equation (3) specifies the appropriate gap size d. Equation (5) represents the width L of the first and second lenses when the distance between the lenses is set to d.

[0365] Equation (4) specifies the range of the width L of the first lens and the second lens that makes it easy to optimize the front brightness.

[0366] If the width of the first lens and the second lens is w, then the distance between the lenses becomes 0, and no gap can be formed in adjacent directions.

[0367] If the widths of the first and second lenses are less than 0.8 × w, the leaked light is less likely to be directed towards the front, but the number of openings in the first and second lenses is too small. Therefore, the light extraction efficiency of the display light with an appropriate transmission wavelength range and the brightness of the front will decrease.

[0368] In the fourth embodiment, the first color layer 231 and the second color layer 232, which are adjacent to each other in the x direction within a unit pixel P, and the second color layer 232 and the third color layer 233 respectively constitute the first sub-pixel and the second sub-pixel.

[0369] The first color layer 231 of a unit pixel P is adjacent to the third color layer 233 of another unit pixel P in the opposite direction of the x direction. Therefore, the first color layer 231 and the third color layer 233 of the other unit pixel P adjacent to it constitute the first sub-pixel and the second sub-pixel.

[0370] The third color layer 233 of unit pixel P is adjacent to the first color layer 231 of other unit pixels P in the x direction. Therefore, the third color layer 233 and the first color layer 231 constitute the first sub-pixel and the second sub-pixel.

[0371] In the fourth embodiment, for any of the first and second sub-pixels mentioned above, the relationships w = wx, d = dx, and L = Lx are satisfied in equations (1) to (5).

[0372] On the other hand, in the fourth embodiment, within a unit pixel P, sub-pixels with different wavelength regions are not adjacent to each other between the unit pixel P and other adjacent unit pixels P, both in the y-direction and the opposite direction of the y-direction. Therefore, there are no sub-pixels that should satisfy equations (1) to (5) that correspond to the first and second sub-pixels. For example, the closer dy is to 0 in the y-direction and the opposite direction of the y-direction, the better.

[0373] An organic EL display device 200 is manufactured by forming a light-emitting element 205 on a substrate 206 using a semiconductor manufacturing process, and then stacking a planarization film 204 on the substrate 206 and the light-emitting element 205 to form a main body 209. A filter 203, a planarization layer 202, and a lens 201 are formed on the planar surface 204a.

[0374] For example, resin compositions in which colorants forming the first color layer 231, the second color layer 232, and the third color layer 233 are dispersed in a photosensitive resin are prepared respectively, and the cured layers of each resin composition are formed on a flat surface 204a by photolithography through exposure and development via a pattern mask, thereby forming the filter portion 203.

[0375] For example, after forming a resin layer on which a planarization layer 202 and a lens 201 are formed in the filter portion 203, the convex lens surface 201a and the shape of the planar portion F of each lens 201 are formed on the surface of the resin layer by etching back, thereby forming the lens 201. The planarization layer 202 is formed from the unetched layered portion in the resin layer.

[0376] The function of the organic EL display device 200 will be explained with a focus on the function of the color filter 210.

[0377] Figure 20 This is a schematic light diagram illustrating the function of the color filter according to the fourth embodiment of the present invention.

[0378] Regarding the organic EL display device 200, the light emission control of the light-emitting element 205 opposite to the first color layer 231 is performed based on the image signal of the red component (hereinafter referred to as the R signal). Similarly, the light emission control of the light-emitting element 205 opposite to the second color layer 232 is performed based on the image signal of the green component (hereinafter referred to as the G signal), and the light emission control of the light-emitting element 205 opposite to the third color layer 233 is performed based on the image signal of the blue component (hereinafter referred to as the B signal).

[0379] Regarding the unit pixel P, light from the light-emitting element 205 driven by the R signal passes through the first color layer 231 and is emitted to the outside, light from the light-emitting element 205 driven by the G signal passes through the second color layer 232 and is emitted to the outside, and light from the light-emitting element 205 driven by the B signal passes through the third color layer 233 and is emitted to the outside, thereby displaying faithful colors in the image signal.

[0380] like Figure 20 As shown, consider light rays incident on points A, B, and C on the lower surface 203b of the first color layer 231. Points A, B, and C are respectively the end point in the z direction opposite to the x direction of the light-emitting element 205 opposite to the first color layer 231, the center point in the x direction, and the end point in the x direction.

[0381] For example, light rays R1 from point B toward the z direction pass through the convex lens surface 201a1 opposite to the first color layer 231, the planarization layer 202, and the first color layer 231 in sequence and are emitted in the z direction.

[0382] For example, a ray R2 traveling in the z-direction and then tilting towards the x-direction enters from point B. To obtain appropriate light extraction efficiency, the angle of ray R2 relative to the z-direction can be set to approximately 45°.

[0383] In this case, in the fourth embodiment, the color filter 210 satisfies equations (1) to (5), so the light ray R2 passes sequentially through the convex lens surface 201a2 opposite to the first color layer 231, the planarization layer 202, and the second color layer 232 and exits in the z-direction. Furthermore, the exit direction of the light ray R2 travels in a direction inclined relative to the z-direction according to the light-gathering performance of the convex lens surface 201a2. However, the light ray R2 is refracted by the convex lens surface 201a2, so even when deviating from the z-direction, it does not deviate significantly from the z-direction. Figure 20 The diagram schematically illustrates the travel of ray R2 in the z-direction. Other rays emitted from the convex lens surface 201a follow the same pattern.

[0384] Below, we will discuss the case where light travels in the z-direction, including both cases where it travels strictly in the z-direction and cases where it travels approximately in the z-direction, unless otherwise stated.

[0385] Like light rays R1 and R2, light rays enter from point B into the first shading layer 231. After passing through the first shading layer 231, the light rays emitted from the convex lens surface 201a1 opposite to the first shading layer 231 and the adjacent convex lens surface 201a2 in the x direction via the planarization layer 202 are both red light.

[0386] Ray R3, which travels parallel to ray R2 from point A, does not pass through the second ray 232 after passing through the first shading layer 231. Instead, it exits from the convex lens surface 201a2 in the z-direction via the planarization layer 202. Therefore, ray R3 is red light.

[0387] Therefore, light rays R1 and R2 form red light corresponding to the R signal.

[0388] According to the fourth embodiment, even light radiated from the light-emitting element 205 in the oblique direction, such as rays R2 and R3, is emitted in the z direction through the adjacent convex lens surface 201a2 in the x direction. Therefore, compared to the case where rays R2 and R3 travel approximately straight in the oblique direction, the frontal brightness of the red light can be improved.

[0389] Ray R4, which travels parallel to ray R2 from point C, passes through the first color layer 231, then through the second color layer 232, and exits from the upper surface 202a via the planarization layer 202.

[0390] The length of the second color layer 232 is greater than the length of the first color layer 231, therefore the color of ray R4 is close to green. Ray R4 is a close to green light emitted based on the R signal, therefore, if it is mixed with the display light and observed, it becomes an error in the green component of the unit pixel P.

[0391] In the fourth embodiment, light ray R4 exits from the upper surface 202a, which has no refractive power. Light ray R4 is refracted at the upper surface 202a according to Snell's law, but travels approximately in a straight line compared to the case where it passes through the convex lens surface 201a. Therefore, light ray R4 travels in a direction inclined at approximately 45° relative to the z-direction.

[0392] The light ray R4 travels at approximately 45° angle relative to the x-direction relative to the front, so when viewed from the front, no display light is mixed into the unit pixel P. Therefore, color mixing in the viewing direction centered on the front is suppressed, and color reproduction becomes good.

[0393] The function of this fourth embodiment will be explained in comparison with existing examples.

[0394] Figure 21 This is a schematic ray diagram illustrating the function of the color filter in Example 2. Figure 22 This is a schematic light diagram illustrating the function of the color filter in Example 3. Figure 23 This is a schematic ray diagram illustrating the function of the color filter in Example 4.

[0395] like Figure 21 As shown, except that the planarization layer 202A replaces the planarization layer 202 of the organic EL display device 200, the organic EL display device 200A of the present example 2 is configured the same as the organic EL display device 200.

[0396] Except that the thickness t2 is less than TA, the planarization layer 202A is the same as the planarization layer 202.

[0397] Therefore, Existing Example 2 is an example where TA = t1 + t2 is less than T in the fourth embodiment. Existing Example 2 is an example where the relationship of Equation (3) is not satisfied because the planarization layer 202A is thinner.

[0398] In Example 2, the heights of the convex lens surfaces 201a and the upper surface 202a, as measured from the upper surface 203a, are reduced, and the light ray R1 is emitted in the same manner as in the fourth embodiment. The emission positions of the convex lens surfaces 201a of the light rays R2 and R3 are different from those in the embodiment, but the emission directions are the same as in the fourth embodiment.

[0399] In contrast, the convex lens surface 201a2 is lower, and as a result, the light ray R4 of Existing Example 2 passes through the convex lens surface 201a2 and is emitted in the z direction in the same way as the light ray R2.

[0400] Therefore, when viewed from the front, the greenish light R4 mixes into the displayed light, resulting in color mixing. Consequently, color reproducibility decreases.

[0401] like Figure 22 As shown, except that the organic EL display device 201B replaces the lens 201 of the organic EL display device 200, the organic EL display device 200B of the present example 3 is configured the same as the organic EL display device 200.

[0402] Lens 201B replaces the convex lens surface 201a of lens 201 and has a convex lens surface 201aB. Except that the width in the x-direction is LxB, which is equal to wx, lens 201B is the same as lens 201.

[0403] Therefore, Example 3 is an example where the distance between lenses 201B becomes 0 because L is equal to w when w is greater than T. Example 3 is an example where the width of lenses 201B in adjacent directions is too large and does not satisfy the relationship of equations (3) and (4).

[0404] In the existing example 3, in a cross-section in at least adjacent directions (a cross-section orthogonal to the y-direction), adjacent convex lens surfaces 201a1B and 201a2B of the convex lens surface 201aB are in contact with each other. Therefore, the upper surface 202a is not exposed between the lenses 201B.

[0405] In Example 3, based on the fact that rays R1, R2, and R3 are emitted in the z direction, ray R4 is emitted from the convex lens surface 201a2B in the z direction, just like ray R2.

[0406] Therefore, when viewed from the front, the greenish light R4 mixes into the displayed light, resulting in color mixing. Consequently, color reproducibility decreases.

[0407] like Figure 23 As shown, except that the planarization layer 202A and lens 201B are replaced by the planarization layer 202 and lens 201 of the organic EL display device 200, the organic EL display device 200C of the present invention 4 is configured the same as the organic EL display device 200. The present invention 4 is a combination of the present invention 2 and the present invention 3.

[0408] Therefore, similar to existing Example 2 and Existing Example 3, Existing Example 4 is an example that does not satisfy the relationship of equations (3) and (4).

[0409] In Existing Example 4, similar to Existing Example 3, ray R4 is emitted from the convex lens surface 201a2B in the z direction, just as ray R1, R2, and R3 are emitted in the z direction.

[0410] Therefore, when viewed from the front, the greenish light R4 mixes into the displayed light, resulting in color mixing. Consequently, color reproducibility decreases.

[0411] The above explanation uses the example of a ray that travels in the z-direction and then in the x-direction as an inclined direction. However, the explanation of a ray that travels in the z-direction and then in the opposite direction of the x-direction can be achieved simply by replacing the x-direction with the opposite direction of the x-direction.

[0412] The above example illustrates the case where the first sub-pixel and the second sub-pixel are the first shading layer 231 and the second shading layer 232, but the same applies when other combinations are set as the first sub-pixel and the second sub-pixel.

[0413] As explained above, the organic EL display device 200 according to the fourth embodiment has a color filter 210 that satisfies formulas (1) to (5) for the first sub-pixel and the second sub-pixel, the first lens and the second lens that are adjacent to each other in the x direction, and therefore has good front brightness and color reproduction.

[0414] To suppress color mixing, light-shielding walls were considered between adjacent subpixels or between adjacent lenses. However, setting such light-shielding walls with high precision could increase manufacturing costs. Furthermore, even light that does not cause color mixing will be absorbed when it reaches the light-shielding walls, potentially reducing light extraction efficiency and front-side brightness.

[0415] In contrast, in the fourth embodiment, no light-shielding wall is provided, thus simplifying the structure of the color filter 210. As a result, manufacturing costs can be reduced, and front brightness can be easily improved.

[0416] [Fifth Implementation]

[0417] The color filter and display device according to the fifth embodiment of the present invention will be described.

[0418] Figure 24 This is a schematic top view illustrating an example of a display device according to the fifth embodiment of the present invention.

[0419] Figure 25 It is along Figure 24 A sectional view of line F208-F208 in the diagram. Figure 26 It is along Figure 24 A sectional view of line F209-F209 in the diagram.Figure 27 It is along Figure 24 A sectional view of line F210-F210 in the diagram.

[0420] Figure 24 The OLED display device 200D (display device) of the fifth embodiment shown has rectangular unit pixels P210 in view of top, replacing the unit pixels P of the OLED display device 200 of the fourth embodiment. The application of the OLED display device 200D is not particularly limited. For example, similar to the OLED display device 200, the OLED display device 200D can be used as a display device for electronic instruments such as smart glasses, head-mounted displays, and electronic viewfinders.

[0421] The following description focuses on the differences from the fourth embodiment.

[0422] The x-width of a unit pixel P210 is 2×wx, and the y-width is Wy. In particular, when 2×wx = Wy, the top-view shape of the unit pixel P210 is a square.

[0423] Unit pixel P210 has a first subpixel region P211, a second subpixel region P212, and a third subpixel region P213. The second subpixel region P212 and the first subpixel region P211 are arranged sequentially in the y-direction. The third subpixel region P213 is configured adjacent to the first subpixel region P211 and the second subpixel region P212 on their respective x-direction sides.

[0424] When viewed from above, the first subpixel region P211 is a rectangle with an x-width of wx and a y-width of Wy / 2. The first subpixel region P211 is, for example, displayed in red.

[0425] When viewed from above, the second subpixel region P212 is a rectangle with an x-width of wx and a y-width of Wy / 2. The second subpixel region P212 is, for example, displayed in green.

[0426] When viewed from above, the third subpixel region P213 is a slender rectangle with an x-width of wx and a y-width of Wy. The third subpixel region P213 is, for example, displayed in blue.

[0427] like Figure 25 As shown, the organic EL display device 200D has a main body 219 and a color filter 211.

[0428] The main body 219 replaces the light-emitting element 205 of the main body 209 in the fourth embodiment and has a light-emitting element 215.

[0429] Except for the different top-view shape, the light-emitting element 215 is the same as the light-emitting element 205 in the fourth embodiment. The light-emitting element 215 includes: a light-emitting element 215A disposed in the first sub-pixel region P211 and the second sub-pixel region P212; and a light-emitting element 215B disposed in the third sub-pixel region P213. For example, an organic EL element can be used as the light-emitting element 215.

[0430] like Figure 24 As shown, the top view shape of each light-emitting element 215A is a rectangle that is slightly smaller than the shape of the configured first sub-pixel region P211 and the second sub-pixel region P212.

[0431] The top view shape of the light-emitting element 215B is a rectangle that is slightly smaller than the shape of the configured third sub-pixel region P213.

[0432] The color filter 211 replaces the filter portion 203 of the color filter 210 in the fourth embodiment and has a filter portion 213.

[0433] The filter section 213 replaces the first color layer 231 and the second color layer 232 of the filter section 203 and has a first color layer 241 (sub-pixel) and a second color layer 242 (sub-pixel).

[0434] The first color layer 241 overlaps with the first sub-pixel region P211. The first color layer 241 has, for example, a red transmission wavelength range.

[0435] like Figure 26 As shown, the second color layer 242 is configured adjacent to the first color layer 241 along the y-direction. The second color layer 242 overlaps with the second sub-pixel region P212. The second color layer 242 has, for example, a green transmission wavelength range.

[0436] The top view shape of the first shading layer 241 and the second shading layer 242 is a rectangle with an x-width of wx and a y-width of wy (=Wy / 2).

[0437] like Figure 24 and Figure 25 As shown, except for overlapping with the third sub-pixel region P213, the third color layer 233 in the fifth embodiment is the same as that in the fourth embodiment. The top view shape of the third color layer 233 is a long rectangle with an x-width of wx and a y-width of 2×wy, which is slender in the y-direction.

[0438] Except for the different top-view shape and configuration of the subpixels, the filter section 213 is formed the same as the filter section 203.

[0439] Except that four lenses are arranged within a unit pixel P210, the lens 201 in the fifth embodiment is the same as the lens 201 in the fourth embodiment.

[0440] Therefore, in the fifth embodiment, one lens 201 is provided in the first subpixel region P211 and the second subpixel region P212, and two lenses are provided in the third subpixel region P213.

[0441] Each lens 201 is configured to face the first color layer 241, the second color layer 242, and the third color layer 233 respectively, separated by the planarization layer 202. In particular, the two lenses 201 facing the third color layer 233 are arranged in the y-direction, which is the long side direction of the third color layer 233.

[0442] like Figure 25 As shown, adjacent lenses 201 in the x-direction are spaced apart by the same gap dx as in the fourth embodiment.

[0443] like Figure 26 and Figure 27 As shown, adjacent lenses 201 in the y direction are spaced apart by the same gap dy.

[0444] In the fifth embodiment, the first color layer 241, the third color layer 233, the second color layer 242, and the third color layer 233 that are adjacent to each other in the x direction within a unit pixel P210 constitute the first sub-pixel and the second sub-pixel, respectively.

[0445] The first color layer 241 of unit pixel P210 is adjacent to the third color layer 233 of other unit pixels P210 in the opposite direction of the x-direction. Therefore, the first color layer 241 and the third color layer 233 of the other unit pixels P210 adjacent to it constitute the first sub-pixel and the second sub-pixel. Similarly, the second color layer 242 and the third color layer 233 of the other unit pixels P210 adjacent to it constitute the first sub-pixel and the second sub-pixel.

[0446] Similarly, the third color layer 233 of unit pixel P210, and the first color layer 241 or the second color layer 242 of other unit pixels P210 adjacent to unit pixel P210 in the x direction constitute the first sub-pixel and the second sub-pixel.

[0447] In the fifth embodiment, the first sub-pixel and the second sub-pixel that are adjacent in the x direction satisfy the relationship w = wx, d = dx, and L = Lx in the above equations (1) to (5).

[0448] In the fifth embodiment, the first color layer 241 and the second color layer 242, which are adjacent to each other in the y direction within a unit pixel P210, constitute the first sub-pixel and the second sub-pixel.

[0449] The first color layer 241 of unit pixel P210 is adjacent to the second color layer 242 of other unit pixels P210 in the y direction. Therefore, the first color layer 241 and the second color layer 242 of the other unit pixels P210 adjacent to it constitute the first sub-pixel and the second sub-pixel. Similarly, the second color layer 242 and the first color layer 241 of the other unit pixels P210 adjacent to it constitute the first sub-pixel and the second sub-pixel.

[0450] In the fifth embodiment, the first sub-pixel and the second sub-pixel that are adjacent in the above-mentioned y direction satisfy the relationship w=wy, d=dy, and L=Ly in the above-mentioned equations (1) to (5).

[0451] Except for the different shapes and configurations of the subpixels of the color filter 211, the organic EL display device 200D of the fifth embodiment is configured the same as the organic EL display device 200.

[0452] In the x and y directions, with respect to the first and second sub-pixels, the first lens and the second lens that are adjacent to each other, the organic EL display device 200D has a color filter 211 that satisfies formulas (1) to (5), so as in the fourth embodiment, the front brightness and color reproduction are good.

[0453] Furthermore, in the above embodiments, 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 organic EL elements. For example, inorganic LED elements can be cited as examples of light-emitting elements.

[0454] In the above embodiments, examples were described using red, green, and blue subpixels arranged in the first subpixel region, the second subpixel region, and the third subpixel region, respectively. However, if color display is possible within a single pixel, the color and arrangement position of the subpixels are not limited thereto.

[0455] Example

[0456] Examples 1 and 2 of the color filters and display devices according to the first and third embodiments will be described together with Comparative Examples 1 and 2. The structures and evaluation results of Examples 1 and 2 and Comparative Examples 1 and 2 are shown in Table 1 below.

[0457] [Table 1]

[0458]

[0459] [Example 1]

[0460] Example 1 is an example corresponding to the first embodiment.

[0461] In Example 1, the size of the unit pixel P is Wx = Wy = 9 (μm), and the x width × y width of the first sub-pixel region P1, the second sub-pixel region P2, and the third sub-pixel region P3 are 3 μm × 9 μm, respectively.

[0462] As shown in [Table 1], the x-width × y-width of the first color layer 31 (subpixel R in [Table 1]), the second color layer 32 (subpixel G in [Table 1]), and the third color layer 33 (subpixel B in [Table 1]) are 3μm × 9μm respectively.

[0463] Each lens 1 has three lenses relative to each sub-pixel. The x-width × y-width of each lens 1 is 3μm × 3μm.

[0464] To manufacture the organic EL display device 100 of Example 1, a TFT layer was formed on a silicon substrate using known methods such as sputtering and etching. After forming a white organic EL element on the TFT layer using known methods such as vapor deposition, an organic EL element substrate was formed by covering silicon nitride using CVD.

[0465] Here, the silicon substrate and the white organic EL element are respectively equivalent to substrate 6 and light-emitting element 5.

[0466] To manufacture the filter section 3, red, green, and blue photosensitive resin compositions RR-1, GR-1, and BR-1, having the compositions shown in Table 2 below, were prepared. Here, the photosensitive resin compositions may also be referred to as photosensitive coloring compositions.

[0467] [Table 2]

[0468]

[0469] In Table 2, "resin" refers to adhesive and "monomer" refers to curing agent. Initiator is an additive used to induce free radical polymerization in the curing agent. Chain transfer agent is an additive used to promote free radical polymerization.

[0470] The red coloring material R-1 for use in the photosensitive resin composition RR-1 is prepared as follows.

[0471] After uniformly mixing the following mixture MR, the mixture MR was dispersed for 5 hours using a sand mixer with glass beads of 1 mm diameter. Subsequently, the mixture MR was filtered through a 5 μm filter to obtain a red coloring material R-1.

[0472] In the mixture MR, as CIPigment Red 254, it is "Ilgarford B-CF" (trade name; manufactured by "BASF"). As CIPigment Yellow139, it is Paliotol (registered trademark) Yellow L2146HD (trade name; manufactured by "BASF").

[0473] (Composition of mixture MR)

[0474] Red pigment: CIPigment Red 254 78 parts by weight

[0475] Yellow pigment: CIPigment Yellow 139 22 parts by weight

[0476] Acrylic varnish (20% solid content) 215 parts by weight

[0477] In addition to replacing the mixture MG with the mixture MG of the following composition, a green coloring material G-1 for the photosensitive resin composition GR-1 is prepared in the same manner as coloring material R-1.

[0478] In the MG mixture, as CIPigment Green 58, FASTOGEN (registered trademark) GREENA110 (trade name; "DIC Co., Ltd.") is used.

[0479] As CIPigment Yellow 185, it is marketed as Paliotol (registered trademark) Yellow L1155 (trade name; manufactured by "BASF").

[0480] (Composition of the mixture MG)

[0481] Green pigment: CIPigment Green 58 65 parts by weight

[0482] Yellow pigment: CIPigment Yellow 185 35 parts by weight

[0483] Acrylic varnish (20% solid content) 215 parts by weight

[0484] In addition to using mixture MB with the following composition instead of mixture MG, blue coloring material B-1 for photosensitive resin composition BR-1 is prepared in the same manner as coloring material R-1.

[0485] In the mixture MB, as CIPigment Blue 15:6, LIONOL (registered trademark) BLUE ES (trade name; manufactured by "Toyo Color Co., Ltd.") is used. As CIPigment Violet 23, LIONOGEN (registered trademark) VIOLET RLUE ES (trade name; manufactured by "Toyo Color Co., Ltd.") is used.

[0486] (Composition of mixture MB)

[0487] Blue pigment: CIPigment Blue 15:6 63 parts by weight

[0488] Purple pigment: CIPigment Violet 23 37 parts by weight

[0489] Acrylic varnish (20% solid content) 215 parts by weight

[0490] Lens 1 and planarization layer 2 can be formed using a transparent material from photosensitive resin compositions RR-1, GR-1, and BR-1, from which coloring pigments have been removed. For example, by replacing the coloring pigments with inorganic components such as silica, titanium dioxide, and zirconium oxide dispersions as refractive index adjusting materials, the refractive index can be adjusted. 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.

[0491] In Example 1, the materials used for lens 1 and planarization layer 2 are transparent materials containing titanium oxide with a refractive index of 1.6, in which the colorant for coloring has been removed from the photosensitive resin compositions RR-1, GR-1, and BR-1.

[0492] The organic EL display device 100 of Example 1 is manufactured in the following manner.

[0493] The transparent resin composition used to form the planarization film 4 on the organic EL element substrate was applied using a spin coater to achieve a film thickness of 0.1 μm during curing. Then, the transparent resin composition was cured in an oven at 100°C for 10 minutes to form the planarization film 4. This formed the main body 9.

[0494] A green photosensitive resin composition GR-1 is applied to the main body 9 using a spin coater to achieve a film thickness of 1.2 μm after curing. Subsequently, a green subpixel, i.e., a second coloring layer 32, is pre-formed in each second subpixel region P2 through ultraviolet exposure, alkali development, water washing, and drying via a pattern mask. The x-width × y-width of each second coloring layer 32 is 3 μm × 9 μm. The pre-formed second coloring layer 32 is then cured by heating in an oven at 80°C for 10 minutes.

[0495] Subsequently, except that the first color layer 31 is formed in the first sub-pixel region P1 using the red photosensitive resin composition RR-1, the same method as that used to form the second color layer 32 is employed.

[0496] Subsequently, except that the third color layer 33 is formed in the third sub-pixel region P3 using the blue photosensitive resin composition BR-1, the same method as that used to form the second color layer 32 is employed.

[0497] In accordance with the above method, a filter portion 3 is formed on the main body portion 9 of Embodiment 1.

[0498] After the filter layer 3 is formed, the material used to form the lens 1 and the planarization layer 2 is applied to the filter layer 3 using a spin coater to achieve a curing film thickness of 3 μm. The entire coating is then exposed to ultraviolet light, and subsequently heated in an oven at 80°C for 10 minutes to cure the coating and form a transparent resin layer.

[0499] Subsequently, a convex lens 1 with a height of 1.5 μm and a width of 3 μm in the x-direction and y-direction is formed on the surface of the transparent resin layer by means of back etching. Three lenses 1 are formed above the first coloring layer 31, the second coloring layer 32, and the third coloring layer 33, respectively.

[0500] Subsequently, a sealant, "Stract Bond" (registered trademark) XMF-T107 (trade name; manufactured by Mitsui Chemicals Co., Ltd.), was used to bond the lens 1 to the cover glass. This resulted in the manufacture of the organic EL display device 100 of Example 1.

[0501] [Example 2]

[0502] Example 2 is an example corresponding to the third embodiment.

[0503] In Example 2, the size of unit pixel P10 is the same as that of unit pixel P. The x-width × y-width of the first subpixel region P11 and the second subpixel region P12 are 4.5μm × 4.5μm, respectively. The x-width × y-width of the third subpixel region P13 is 4.5μm × 9μm.

[0504] As shown in [Table 1], the x-width × y-width of the first color layer 41 (subpixel R in [Table 1]) and the second color layer 42 (subpixel G in [Table 1]) are 4.5μm × 4.5μm, respectively.

[0505] The x-width × y-width of the third color layer 43 (subpixel B in [Table 1]) is 4.5 μm × 9 μm.

[0506] Each lens 1 is provided with one lens opposite to the first colored layer 41 and the second colored layer 42. Two lenses are provided opposite to the third colored layer 43. The x-width × y-width of each lens 1 is 4.5μm × 4.5μm.

[0507] Except for the different sizes and configurations of each sub-pixel and each lens 1, the organic EL display device 100F of Embodiment 2 is manufactured in the same manner as Embodiment 1.

[0508] [Comparative Example 1]

[0509] Comparative Example 1 is Figure 6 , 7 An example of an organic EL display device 110 is shown.

[0510] As shown in [Table 1], except that the x-width × y-width of the lens 111 viewed from above is 3μm × 9μm, the organic EL display device 110 of Comparative Example 1 is the same as that of Example 1.

[0511] [Comparative Example 2]

[0512] As shown in [Table 1], except for a lens with an x-width × y-width of 3μm × 9μm that is disposed opposite to the third color layer 43, the organic EL display device of Comparative Example 2 is the same as that of Example 2.

[0513] [evaluate]

[0514] Visual confirmation evaluations were conducted for Examples 1 and 2, and Comparative Examples 1 and 2.

[0515] In this evaluation, the organic EL display devices of Examples 1, 2, and Comparative Examples 1, 2 were illuminated in white and observed from the front (z direction) and at an angle. Visual confirmability was evaluated based on the brightness of the light.

[0516] The visual certainty of the subject is determined by whether the brightness of the image makes it easy to see.

[0517] When the image is easily visible, it is rated as good (marked as A in [Table 1]). When the image is dark and difficult to see, it is rated as poor (marked as B in [Table 1]).

[0518] In a plane orthogonal to the x-direction, the visual confirmability from the tilt direction is determined based on the change in brightness when the front is set to 0° and the viewing angle is changed from 0° to 45°.

[0519] If the degree of brightness variation is acceptable, it is rated as good (denoted as A in [Table 1]); if the degree of brightness variation is unacceptable, it is rated as poor (denoted as B in [Table 1]).

[0520] [Evaluation Results]

[0521] As shown in [Table 1], in Examples 1 and 2, both the visual confirmability from the front and the visual confirmability from the tilt direction are good. Therefore, the organic EL display devices of Examples 1 and 2 have excellent visual confirmability.

[0522] In Comparative Examples 1 and 2, both the visual confirmation from the front and the visual confirmation from the tilted direction were poor.

[0523] In Comparative Examples 1 and 2, the front brightness was reduced compared to Examples 1 and 2, making it difficult to see.

[0524] In addition, when viewed from an oblique direction, the brightness varies more significantly based on the viewing angle compared to Examples 1 and 2.

[0525] It can be assumed that this is because Comparative Examples 1 and 2 are equipped with slender lenses in the y-direction, which reduces the light-gathering performance in the y-direction.

[0526] Next, embodiments 3 and 4 of the color filter and display device according to the fourth embodiment will be described together with comparative examples 3 and 4. The structures and evaluation results of embodiments 3 and 4, and comparative examples 3 and 4 are shown in Table 3 below.

[0527] [Table 3]

[0528]

[0529] [Example 3]

[0530] Example 3 is an example corresponding to the fourth embodiment.

[0531] The size of the unit pixel P of the organic EL display device 200 in Example 3 is Wx = Wy = 7.2 (μm), and the x width × y width of the first subpixel region P201, the second subpixel region P202, and the third subpixel region P203 are 2.4 μm × 7.2 μm, respectively.

[0532] The x-width × y-width of the first shading layer 231, the second shading layer 232, and the third shading layer 233 (hereinafter sometimes referred to as each sub-pixel) are 2.4μm × 7.2μm, respectively.

[0533] As shown in [Table 3], the width w of the enlarged adjacent direction is 2.4 μm. The thickness t1 of each subpixel is 1.0 μm. The thickness t2 of the planarization layer 202 is 1.2 μm.

[0534] Each lens 201 is provided with three lenses corresponding to each sub-pixel. The x-width × y-width of each lens 201 is 2.0μm × 2.0μm.

[0535] Each lens 201 is arranged in the x-direction such that its optical axis coincides with the center of each sub-pixel, and is spaced apart by a gap of 0.4 μm in the x-direction. Each lens 201 is also arranged in the y-direction with a gap of 0.4 μm.

[0536] Therefore, as shown in [Table 3], the width L of each lens 201 in the x direction of adjacent directions is 2.0 μm, and the distance d between each lens 201 is 0.4 μm.

[0537] The color filter 210 of Example 3 satisfies all the equations (1) to (5) in the x direction.

[0538] To manufacture the organic EL display device 200 of Example 3, a TFT layer is formed on a silicon substrate using known methods such as sputtering and etching. After forming a white organic EL element on the TFT layer using known methods such as vapor deposition, an organic EL element substrate is formed by covering silicon nitride using CVD.

[0539] Here, the silicon substrate and the white organic EL element are respectively equivalent to substrate 206 and light-emitting element 205.

[0540] In order to manufacture the filter section 203, red, green and blue photosensitive resin compositions RR-1, GR-1 and BR-1 having the compositions shown in Table 2 above were prepared.

[0541] Lens 201 and planarization layer 202 can be formed using a transparent material from which the coloring pigment has been removed from the photosensitive resin compositions RR-1, GR-1, and BR-1. For example, by replacing the coloring pigment with inorganic components such as silica, titanium dioxide, and zirconium oxide dispersions as refractive index adjusting materials, the refractive index can be adjusted. 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.

[0542] In Example 3, the materials for lens 201 and planarization layer 202 are titanium oxide containing a refractive index of 1.6 from a transparent material from which the colorant for coloring has been removed from the photosensitive resin compositions RR-1, GR-1, and BR-1.

[0543] The organic EL display device 200 of Example 3 is manufactured in the following manner.

[0544] The transparent resin composition used to form the planarization film 204 on the organic EL element substrate was coated using a spin coater to achieve a film thickness of 0.1 μm during curing. Then, the transparent resin composition was cured in an oven at 100°C for 10 minutes to form the planarization film 204. This formed the main body 209.

[0545] A green photosensitive resin composition GR-1 was applied to the main body 209 using a spin coater to achieve a cured film thickness of 1.2 μm. Subsequently, a second color layer 232, serving as a green subpixel, was pre-formed in each second subpixel region P202 through ultraviolet exposure, alkali development, water washing, and drying processes via a pattern mask. Each second color layer 232 has an x-width × y-width of 2.4 μm × 7.2 μm. The pre-formed second color layer 232 was then cured by heating in an oven at 80°C for 10 minutes.

[0546] Subsequently, except that the first color layer 231 is formed in the first sub-pixel region P201 using the red photosensitive resin composition RR-1, the same method as that used to form the second color layer 232 is employed.

[0547] Subsequently, except that the third color layer 233 is formed in the same manner as the formation of the second color layer 232, except that the blue photosensitive resin composition BR-1 is used to form the third sub-pixel region P 203.

[0548] In accordance with the above methods, a filter portion 203 is formed on the main body portion 209 of Embodiment 3.

[0549] After the filter element 203 is formed, the materials used to form the lens 201 and the planarization layer 202 are applied to the filter element 203 using a spin coater to achieve a curing film thickness of 2.4 μm. The entire coating is then exposed to ultraviolet light, and subsequently heated in an oven at 80°C for 10 minutes to cure the coating and form a transparent resin layer.

[0550] Subsequently, a convex lens 201 with a height of 1.2 μm and an x-width and y-width of 2.0 μm is formed on the surface of the transparent resin layer by etching back. Three lenses 201 are formed above the first coloring layer 231, the second coloring layer 232, and the third coloring layer 233, respectively.

[0551] Subsequently, a sealant, "Stract Bond" (registered trademark) XMF-T107 (trade name; manufactured by Mitsui Chemicals Co., Ltd.), was used to bond the lens 201 to the cover glass. Thus, the organic EL display device 200 of Example 3 was manufactured.

[0552] [Example 4]

[0553] Except for setting the subpixel thickness t1 to 1.2 μm and the planarization layer thickness t2 to 1.0 μm, Example 4 is the same as Example 3.

[0554] The color filter 210 of Example 4 satisfies all the equations (1) to (5) in the x direction.

[0555] [Comparative Example 3]

[0556] Comparative Example 3 is constructed in the same manner as Example 3, except that the thickness t1 of the subpixel is set to 1.2 μm and the x-width × y-width of the lens is set to 2.4 μm × 2.4 μm. Therefore, in Comparative Example 3, T = t1 + t2 = 2.4 (μm), w = 2.4 (μm), L = 2.4 (μm), and d = 0 (μm).

[0557] Comparative Example 3 does not satisfy equations (2) and (4).

[0558] [Comparative Example 4]

[0559] Comparative Example 4 is constructed in the same manner as Example 3, except that the thickness t1 of the subpixel is set to 1.2 μm and the thickness t2 of the planarization layer is set to 1.4 μm. Therefore, in Comparative Example 4, T = t1 + t2 = 2.6 (μm), w = 2.4 (μm), L = 2.4 (μm), and d = 0 (μm).

[0560] Comparative Example 4 does not satisfy Equation (2).

[0561] [evaluate]

[0562] Color reproduction evaluations were conducted for Examples 3 and 4, as well as Comparative Examples 3 and 4.

[0563] In this evaluation, the organic EL display devices of Examples 3 and 4, and Comparative Examples 3 and 4, were illuminated in single colors of red, green, and blue, respectively, and the display colors were observed from the front (z direction).

[0564] Furthermore, regarding the organic EL display devices of Examples 3 and 4, and Comparative Examples 3 and 4, three monochrome organic EL display devices (hereinafter referred to as monochrome machines) were manufactured in which all sub-pixels are formed using any one of red, green, and blue, and the display of various colors was observed from the front. In the monochrome machine, light emitted from the light-emitting element only passes through all sub-pixels of the same color, thus no color mixing occurs.

[0565] Furthermore, the monochrome display colors of the organic EL display devices of Examples 3 and 4, and Comparative Examples 3 and 4, as well as the display colors of the same monochrome machine, were compared using various colors.

[0566] If the color displayed in monochrome is the same as the color displayed in a monochrome machine of the same color, it is judged to have good color reproduction (denoted as A in [Table 3]).

[0567] If the color displayed in monochrome changes relative to the color displayed in a monochrome machine of the same color, it is judged as poor color reproduction (denoted as B in [Table 3]).

[0568] [Evaluation Results]

[0569] As shown in [Table 3], color reproduction is good in Examples 3 and 4. In Examples 3 and 4, the color filter 210 satisfies all of the equations (1) to (5), which can be considered as the reason why most of the light transmitted from the adjacent subpixels is emitted outward from the upper surface 202a, and less light is emitted towards the front.

[0570] In contrast, in Comparative Examples 3 and 4, color reproduction is poor. In Comparative Examples 3 and 4, some of Equations (1) to (5) are not satisfied. Therefore, it can be considered that this is because the amount of light transmitted from the adjacent subpixel increases towards the front due to the focusing effect of the lens opposite to the adjacent subpixel.

[0571] The preferred embodiments and modifications of the present invention have been described above together with the various examples. The present invention is not limited to the various embodiments, modifications, and examples. Additions, omissions, substitutions, and other changes to the structure can be made without departing from the spirit of the present invention.

[0572] Furthermore, the present invention is not limited by the foregoing description, but only by the claims.

[0573] For example, the light-shielding wall of the second embodiment and its modifications can be provided on the color filter of the third embodiment.

[0574] Explanation of the label

[0575] 1. Lenses 201 and 201B

[0576] 1a, 201a, 201a1, 201a1B, 201a2, 201a2B Convex lens surfaces

[0577] 2, 2C, 2E, 202, 202A planarization layers

[0578] 202a upper surface

[0579] Filter sections 3, 3A, 3B, 3C, 3D, 13, 203, 213

[0580] 4. 204 planarization film

[0581] 5, 15, 15A, 15B, 205, 215, 215A, 215B Light-emitting elements

[0582] 6. 206 substrate

[0583] 7A, 7B, 7C, 7D, 7E Light-blocking walls

[0584] Main body sections 9, 19, 209, 219

[0585] Color filters 10, 10A, 10B, 10C, 10D, 10E, 10F, 210, 211

[0586] 31, 231, 241 First shader layer (subpixel, elongated pixel)

[0587] 32, 232, 242 Second shader layer (subpixel, elongated pixel)

[0588] 33, 233 Third shader layer (subpixel, elongated pixel)

[0589] 41 First shader layer (subpixel, first subpixel)

[0590] 42 Second shader layer (subpixel, second subpixel)

[0591] 43 Third shader layer (subpixel, elongated pixel, third subpixel)

[0592] 100, 100A, 100B, 100C, 100D, 100E, 100F, 200, 200D Organic EL Display Devices (Display Devices)

[0593] F Plane section

[0594] O optical axis

[0595] P, P10, P210 (unit pixels)

[0596] P1, P11, P201, P211 First subpixel region

[0597] P2, P12, P202, P212 Second sub-pixel region

[0598] P3, P13, P203, P213 Third sub-pixel region

Claims

1. A color filter, wherein, The color filter has the following characteristics: The first subpixel, which is included in the plurality of subpixels constituting the unit pixel of the color display, has a first transmission wavelength range; A first lens is disposed opposite to the first sub-pixel in the thickness direction of the first sub-pixel; The second sub-pixel is included in a plurality of sub-pixels constituting the unit pixel or other unit pixels adjacent to the unit pixel, has the same thickness as the first sub-pixel, and a second transmission wavelength range different from the first transmission wavelength range, and is adjacent to the first sub-pixel; The second lens is disposed opposite to the second sub-pixel in the thickness direction of the second sub-pixel, and is disposed adjacent to the first lens in the same direction as the adjacent direction of the second sub-pixel relative to the first sub-pixel; as well as A planarization layer, disposed between the first sub-pixel and the second sub-pixel and the first lens and the second lens, satisfies the following equations (1) to (5). [Mathematical Expression 1] T = t1 + t2...(1) w>T...(2) d=2×(wT)...(3) 0.8×w≤L<w...(4) L=wd...(5) Here, t1 is the thickness of the first sub-pixel and the second sub-pixel respectively, t2 is the thickness of the planarization layer, the width of the first sub-pixel and the second sub-pixel in the adjacent direction is w, the width of the first lens and the second lens in the adjacent direction is L, and d is the distance between the first lens and the second lens in the adjacent direction.

2. The color filter according to claim 1, wherein, The unit pixel and the other unit pixels comprise three sub-pixels, each having a different transmission wavelength range for red, green, and blue, and arranged in the same adjacent direction. The lengths of the directions orthogonal to the adjacent directions of the three sub-pixels are equal. In at least one group of subpixels that are adjacent to each other among the three subpixels, the equations (1) to (5) are satisfied.

3. The color filter according to claim 1, wherein, The unit pixel and the other unit pixels include: The first color subpixel has any first color transmission wavelength range of red, green and blue; A second color subpixel having a transmission wavelength range of a second color, different from the first color, among the red, green, and blue; and The third color subpixel has a transmission wavelength range of a third color, which is different from the first and second colors, among the red, green, and blue colors, and is elongated in one direction. The first color sub-pixel and the second color sub-pixel are adjacent to each other along the long side of the third color sub-pixel, and the first color sub-pixel and the second color sub-pixel are respectively arranged adjacent to the third color sub-pixel along the short side that intersects the long side of the third color sub-pixel. In at least one group of subpixels that are adjacent to each other among the first color subpixel, the second color subpixel and the third color subpixel, the equations (1) to (5) are satisfied.

4. A display device, wherein, The display device has: The color filter according to any one of claims 1 to 3; and Multiple light-emitting elements, each of which is opposite to the multiple sub-pixels constituting the unit pixel.

5. The display device according to claim 4, wherein, The light-emitting element is an organic EL element.

Images