JP2016212286A - Color filter, color filter substrate, and display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve display characteristics and suppress a reduction in accuracy of positioning.SOLUTION: A color filter 10 for display comprises: a transparent substrate 11; first colored layers 20, 30, and 40 and an alignment mark 60 that are provided on the transparent substrate; and a scattering layer 14 that is provided on the transparent substrate to cover the first colored layers and alignment mark. The thickness t3 of the scattering layer on the alignment mark is smaller than the thickness t4 of the scattering layer on the first colored layers.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a color filter for a display device having a scattering layer, a color filter substrate, and a display device.

  In recent years, liquid crystal display devices and organic EL display devices have been put to practical use as flat displays. In these display devices, in general, a color filter is provided in order to extract only light having a desired wavelength from the light from the light source or to improve the color purity of the light from the light source.

  Development of electronic paper, which is a flat type display device, is also underway. Electronic paper displays characters, images, and the like by controlling reflected light of ambient light (hereinafter also referred to as “environmental light”). Such electronic paper has excellent characteristics such as low power consumption, no eye fatigue, and good visibility under direct sunlight.

  As an electronic paper capable of color display, one that includes a color filter having a plurality of colored layers and a reflective display element capable of performing white display and black display is known (for example, Patent Document 1). reference). This electronic paper can display a desired color image by reflecting ambient light by performing white display using a reflective display element and transmitting the reflected light through a color filter.

  In such a display device, display characteristics with a wide viewing angle and display characteristics close to paper are desired. In order to realize such display characteristics, a configuration in which a scattering layer is provided on the color filter and light transmitted through the color filter is scattered by the scattering layer is conceivable.

  By the way, in order to improve the manufacturing efficiency of the display device, a display device using a color filter substrate having a plurality of color filters and a counter substrate having a plurality of electrode forming regions provided with pixel driving electrodes. A method of manufacturing is known. An example of the counter substrate is a TFT (Thin Film Transistor) substrate.

  An alignment mark is provided on each of the color filter substrate and the counter substrate. The color filter substrate and the counter substrate are positioned so that the alignment mark of the color filter substrate and the alignment mark of the counter substrate overlap, and the color filter substrate and the counter substrate are bonded to each other. Thereby, each color filter faces the corresponding electrode formation region.

  Then, a plurality of display devices can be manufactured by cutting the bonded color filter substrate and counter substrate along the periphery of the color filter.

  FIG. 10 is a longitudinal sectional view of a conventional color filter substrate 200X. The colored layers 20, 30, 40 and the alignment mark 60X are covered with the scattering layer 14X. The alignment mark 60X has, for example, a cross shape when viewed from the scattering layer 14X side.

  At the time of positioning, the alignment mark 60X of the color filter substrate 200X is read. For example, as shown in FIG. 10, the alignment mark 60 </ b> X is irradiated from the transparent base material 11 side to the vicinity of the alignment mark 60 </ b> X with the imaging light L <b> 1 and the transmitted light is used from the scattering layer 14 </ b> X side with a camera or the like. This is done by imaging. Since the alignment mark 60X blocks the imaging light L1, an image of the alignment mark 60X can be acquired.

JP 2003-280044 A

  However, as shown in FIG. 10, the light L1 incident on the scattering layer 14X is scattered by the scattering layer 14X on the alignment mark 60X. For this reason, as shown in FIG. 11, an image in which the edge (outline) of the alignment mark 60 </ b> X is blurred is acquired by the scattered light.

  When positioning is performed using such an image with a blurred edge, the alignment mark 60X and the alignment mark of the counter substrate cannot be accurately overlapped, so that the position of the color filter substrate 200X and the counter substrate is accurately aligned. I can't. That is, the positioning accuracy is lowered.

  The present invention has been made in consideration of such points, and an object of the present invention is to provide a color filter, a color filter substrate, and a display device that can suppress deterioration in positioning accuracy while improving display characteristics. .

The color filter according to an embodiment of the present invention is
A color filter for a display device,
A transparent substrate;
A first colored layer and an alignment mark provided on the transparent substrate;
A scattering layer provided on the transparent substrate so as to cover the first colored layer and the alignment mark,
The thickness of the scattering layer on the alignment mark is smaller than the thickness of the scattering layer on the first colored layer.

In the above color filter,
A first black matrix layer provided on the transparent substrate and having a plurality of openings formed thereon;
The first colored layer is provided in the plurality of openings of the first black matrix layer;
The alignment mark may have a second black matrix layer.

In the above color filter,
The thickness of the second black matrix layer may be greater than the thickness of the first black matrix layer.

In the above color filter,
The alignment mark may include a second colored layer stacked on the second black matrix layer.

In the above color filter,
The alignment mark may include a plurality of second colored layers stacked on the second black matrix layer.

In the above color filter,
A first protective layer provided on the transparent substrate to cover the first black matrix layer and the first colored layer;
The scattering layer is provided to cover the first protective layer and the alignment mark,
The alignment mark may include a second protective layer stacked on the second black matrix layer.

In the above color filter,
A columnar first spacer provided on the first black matrix layer;
The alignment mark may include a second spacer provided on the second black matrix layer.

A display device according to an embodiment of the present invention includes:
The above color filter;
A display element arranged to face the color filter;
Is provided.

The color filter substrate according to one embodiment of the present invention,
A color filter substrate having a plurality of color filters for a display device,
A transparent substrate;
A first colored layer and an alignment mark provided on the transparent substrate;
A scattering layer provided on the transparent substrate so as to cover the first colored layer and the alignment mark,
The thickness of the scattering layer on the alignment mark is smaller than the thickness of the scattering layer on the first colored layer.

  According to the present invention, it is possible to suppress a decrease in positioning accuracy while improving display characteristics.

It is a longitudinal cross-sectional view which shows schematic structure of the electronic paper which concerns on 1st Embodiment. (A) is a top view of the color filter substrate which concerns on 1st Embodiment, (b) is a top view of a counter substrate. (A)-(c) is a top view of an alignment mark. It is a longitudinal cross-sectional view along the AA line of the color filter board | substrate of Fig.2 (a). (A) is a top view of the color filter substrate which concerns on 2nd Embodiment, (b) is a top view of a counter substrate. It is a longitudinal cross-sectional view which shows schematic structure of the color filter board | substrate which concerns on 3rd Embodiment. It is a longitudinal cross-sectional view which shows schematic structure of the color filter board | substrate which concerns on 4th Embodiment. It is a longitudinal cross-sectional view which shows schematic structure of the color filter board | substrate which concerns on 5th Embodiment. It is a longitudinal cross-sectional view which shows schematic structure of the color filter board | substrate which concerns on 6th Embodiment. It is a longitudinal cross-sectional view of a conventional color filter substrate. It is a figure which shows the image of the conventional alignment mark.

  Embodiments of the present invention will be described below with reference to the drawings. In the drawings attached to the present specification, for the sake of illustration and ease of understanding, the scale, the vertical / horizontal dimension ratio, and the like are appropriately changed and exaggerated from those of the actual ones.

(First embodiment)
First, the entire electronic paper (display device) 100 will be described with reference to FIG. Although the electronic paper 100 will be described as an example, the color filter 10 of the present embodiment can be applied to various reflective or transmissive display devices such as a liquid crystal display device and an organic EL display device.

Electronic Paper FIG. 1 is a longitudinal sectional view showing a schematic configuration of an electronic paper 100 according to the first embodiment. As shown in FIG. 1, the electronic paper 100 includes a color filter 10 for electronic paper, and a reflective display element 80 arranged to face the color filter 10 and performing white display and black display. Yes.

  The color filter 10 includes a transparent substrate 11, a BM layer (first black matrix layer) 12 provided on the transparent substrate 11, and a plurality of colored layers (first colored layers) provided on the transparent substrate 11. ) 20, 30, 40, and a scattering layer 14 provided on the transparent substrate 11 so as to cover the BM layer 12 and the colored layers 20, 30, 40.

  The BM layer 12 has a plurality of openings. The plurality of colored layers 20, 30, and 40 are provided in the plurality of openings of the BM layer 12. Each of the colored layers 20, 30, and 40 corresponds to one pixel.

  The color filter 10 is disposed so that the scattering layer 14 and the reflective display element 80 face each other. Therefore, an observer observes the electronic paper 100 from the transparent base material 11 side (z direction side).

  Ambient light enters the reflective display element 80 through the color filter 10 from the viewer side. The reflective display element 80 is configured to control whether or not ambient light is reflected for each pixel. The reflective display element 80 performs white display by reflecting the ambient light and performs black display by not reflecting the ambient light. Therefore, the reflective display element 80 can display characters and images without using a backlight. A front light that irradiates light to the reflective display element 80 from the observer side when the ambient light is weak may be provided.

  The display method of the reflective display element 80 is not particularly limited, and a known one can be applied. For example, an electrophoresis method, a twist ball method, a powder movement method (an electronic powder fluid method, a charged toner type method). ), Liquid crystal display method, thermal method (coloring method, light scattering method), electrochromic method, electrowetting method, and magnetophoresis method.

  Here, as an example, an electrowetting reflective display element 80 will be schematically described. The reflective display element 80 includes a white substrate 81, a plurality of first transparent electrodes 82 provided on the white substrate 81, a hydrophobic insulating layer 83 provided on the first transparent electrode 82, and a hydrophobic insulating layer. 83, a plurality of pixel side walls 84 provided on 83, an oil layer 85 provided between adjacent pixel side walls 84, a transparent liquid 86 provided on the oil layer 85 and the pixel side walls 84, and a liquid 86 And a second transparent electrode 87 provided. A transparent substrate may be provided on the second transparent electrode 87.

  Each oil layer 85 is located on the corresponding first transparent electrode 82. One set of the first transparent electrode 82 and the oil layer 85 corresponds to one pixel.

  When no voltage is applied between the first transparent electrode 82 and the second transparent electrode 87, the oil layer 85 covers the hydrophobic insulating layer 83 between the adjacent pixel side walls 84 as shown in the figure. Since the oil layer 85 is colored, for example, black, the incident ambient light is not reflected by the oil layer 85 and black display is performed.

  On the other hand, when a voltage is applied between the first transparent electrode 82 corresponding to a certain pixel and the second transparent electrode 87, the oil layer 85 corresponding to this pixel is not shown in FIG. The liquid 86 comes into contact with the hydrophobic insulating layer 83 at the position corresponding to this pixel. Thereby, in this pixel, the incident environmental light reaches the white substrate 81 and is reflected by the white substrate 81 to perform white display.

  In this way, the electronic paper 100 can perform a desired color image display by reflecting the ambient light by performing white display using the reflective display element 80 and transmitting the reflected light to the color filter 10. . Here, since the reflected light from the reflective display element 80 is scattered by the scattering layer 14 and then passes through the color filter 10, display characteristics close to paper and display characteristics with a wide viewing angle can be obtained.

  Next, a method for manufacturing the electronic paper 100 will be schematically described. The electronic paper 100 is manufactured by bonding together a color filter substrate 200 on which a plurality of color filters 10 are provided and a counter substrate 300 on which members of a plurality of reflective display elements 80 are provided, as will be described below. Is done.

  FIG. 2A is a plan view of the color filter substrate 200 according to the first embodiment. As shown in FIG. 2A, the color filter substrate 200 has a plurality of active regions 210 arranged on a transparent substrate 11 and arranged in a matrix. In each active region 210, the BM layer 12 and the colored layers 20, 30, and 40 of the color filter 10 are provided. One active area 210 corresponds to one color filter 10. That is, the color filter substrate 200 has a plurality of color filters 10.

  FIG. 2B is a plan view of the counter substrate 300. The counter substrate 300 is provided on the white substrate 81 and has a plurality of electrode formation regions 310 arranged in a matrix. In each electrode formation region 310, for example, the first transparent electrode 82, the hydrophobic insulating layer 83, the pixel side wall 84, and the oil layer 85 of the reflective display element 80 are provided.

  The color filter substrate 200 includes a plurality of alignment marks 60 provided at the edge portion. The counter substrate 300 includes a plurality of alignment marks 70 provided at the edge portion.

  The plurality of alignment marks 60 on the color filter substrate 200 are provided at positions corresponding to the plurality of alignment marks 70 on the counter substrate 300.

  The positions where the alignment marks 60 and 70 are provided are not particularly limited as long as they are other than the active region 210 and the electrode formation region 310, and the number thereof is not limited.

  3A to 3C are plan views of the alignment marks 60 and 70. FIG. The shape of the alignment marks 60 and 70 is not particularly limited, and may be, for example, a cross shape as shown in FIG. 3A, a # shape as shown in FIG. 3B, or a square shape as shown in FIG. But you can.

  The color filter substrate 200 and the counter substrate 300 are positioned so that the plurality of alignment marks 60 on the color filter substrate 200 and the plurality of alignment marks 70 on the counter substrate 300 overlap. In this state, the color filter substrate 200 and the counter substrate 300 are bonded together. Thereby, each active region 210 is fixed so as to face the corresponding electrode formation region 310.

  Next, the bonded color filter substrate 200 and counter substrate 300 are cut for each active region 210. And the several electronic paper 100 is completed through a required manufacturing process.

Color Filter and Alignment Mark Next, the structure of the color filter substrate 200, that is, the structure of the color filter 10 and the alignment mark 60 will be described in detail with reference to FIG. FIG. 4 is a longitudinal sectional view taken along the line AA of the color filter substrate 200 of FIG.

  The alignment mark 60 is provided on the transparent substrate 11. The alignment mark 60 has a BM layer (second black matrix layer) 61. In the present embodiment, the alignment mark 60 is composed of the BM layer 61. The thickness t1 of the BM layer 61 of the alignment mark 60 is larger than the thickness t2 of the BM layer 12 of the active region 210. The thickness t1 of the BM layer 61 may be larger than the thickness of the colored layers 20, 30, and 40. The BM layer 61 is made of the same material as the BM layer 12.

  The scattering layer 14 is provided on the transparent substrate 11 so as to cover the BM layer 12, the colored layers 20, 30, 40 and the alignment mark 60.

(Transparent substrate)
As the transparent substrate 11, various materials having transparency that can appropriately support the BM layer 12, the colored layers 20, 30, 40, the scattering layer 14, and the alignment mark 60 are used. A polymer or the like is used.

(BM layer)
The BM layer 12 is configured to shield ambient light from the observer side and reflected light from the reflective display element 80. In the present embodiment, the BM layer 12 has a matrix pattern. The specific pattern of each region defined by the BM layer 12 is not particularly limited.

  The material of the BM layers 12 and 61 is not particularly limited as long as it has a desired light shielding property. For example, a resin composition containing a black colorant such as carbon black or titanium black can be used. As the resin used in this resin composition, for example, a photosensitive resin having a reactive vinyl group such as acrylate, methacrylate, polyvinyl cinnamate, or cyclized rubber is used.

  The BM layers 12 and 61 may be formed by applying a BM layer forming coating solution on the transparent substrate 11 and patterning it by a photolithography method including an exposure step and a development step. At this time, exposure may be performed using a multi-tone mask such as a halftone mask. Thereby, the exposure amount can be varied between the region where the BM layer 12 is formed and the region where the BM layer 61 is formed. Therefore, the thickness t2 of the BM layer 12 and the thickness t1 of the BM layer 61 can be made different by development.

  Note that after forming the BM layers 12 and 61 having the same thickness t2 by using the photolithography method, the thickness of the BM layer 61 may be increased again by using the photolithography method.

(Colored layer)
The colored layers 20, 30, and 40 are provided between regions defined by the BM layer 12, that is, between the BM layers 12.

  For example, the colored layer 20 includes a blue colored layer that transmits blue light, the colored layer 30 includes a green colored layer that transmits green light, and the colored layer 40 includes a red colored layer that transmits red light. You may provide the white colored layer etc. which permeate | transmit white light.

  Each of the colored layers 20, 30, and 40 is a layer formed by patterning a photosensitive colored layer material by a photolithography method including an exposure step and a development step. As the coloring layer material to be patterned by the photolithography method, any of negative and positive coloring layer materials can be used. The order in which the colored layers 20, 30, 40 are formed may be any order.

  Next, a first colored layer material (hereinafter referred to as a first material), a second colored layer material (hereinafter referred to as a second material), and a third colored layer material constituting each colored layer 20, 30, 40 (Hereinafter, the third material) will be described. Each of the first to third materials includes a pigment dispersion including pigments and dyes of each color and a dispersant, a photoinitiator, a clearing agent including a polymer and a monomer, a surfactant, and the like. Of these, the photoinitiator generates a radical component when irradiated with light. Further, the clearing agent contains at least a component that causes a polymerization reaction by a radical generated by the photoinitiator and cures, and a component that can dissolve the unexposed portion by subsequent development.

  Thus, each colored layer 20, 30, 40 is configured to transmit the corresponding color light, while the BM layer 12 is configured to shield the light.

(Scattering layer)
The visible light transmittance of the scattering layer 14 is preferably 35% or more, and more preferably 75% or more. The haze value of the scattering layer 14 may be about 5 to 65.

  The scattering layer 14 includes a transparent resin and scattering particles that are dispersed in the transparent resin and exhibit a light scattering action.

  After the BM layer 12, the colored layers 20, 30, 40, and the alignment mark 60 are formed, the scattering layer 14 contains a transparent resin and scattering particles, and has a photosensitive scattering layer forming coating solution. 11, the BM layer 12, the colored layers 20, 30, 40 and the alignment mark 60 may be applied and cured.

  As described above, since the thickness t1 of the BM layer 61 is larger than the thickness t2 of the BM layer 12, the thickness of the scattering layer forming coating solution on the BM layer 61 is applied after the liquid scattering layer forming coating solution is applied. Is smaller than the thickness of the scattering layer forming coating solution on the BM layer 12. The thickness of the scattering layer forming coating solution on the BM layer 61 is smaller than the thickness of the scattering layer forming coating solution on the colored layers 20, 30, 40.

  Therefore, the thickness t3 of the scattering layer 14 on the alignment mark 60 is smaller than the thickness t4 of the scattering layer 14 on the colored layers 20, 30, and 40.

  The transparent resin is not particularly limited as long as it has transparency, and is appropriately selected in consideration of the difference in refractive index from the scattering particles. Examples of the transparent resin include acrylic resins and epoxy resins.

  The material of the scattering particles is not particularly limited as long as it has a light scattering action. For example, inorganic substances such as titanium oxide, zirconia, silicon dioxide, aluminum oxide, barium sulfate, acrylic resins, divinylbenzene resins, benzoguanamine resins, styrene resins, melamine resins, acrylic-styrene resins, polycarbonate resins, Examples thereof include organic substances such as polyethylene resins and polyvinyl chloride resins, and fine particles such as a mixture of two or more thereof.

  It is preferable that the scattering particles have transparency. This is because the transmittance of the scattering layer 14 can be improved. As such scattering particles, for example, a melamine resin, a benzoguanamine resin, or the like may be used.

  The average particle diameter of the scattering particles is, for example, in the range of 50 nm or more and 600 nm or less. The shape of the scattering particles may be spherical, for example. The refractive index of the scattering particles may be larger than the refractive index of the transparent resin. The content of the scattering particles is not particularly limited as long as it is an amount that can scatter light and does not impair the transparency of the scattering layer 14.

  When the color filter substrate 200 and the counter substrate 300 are positioned, the alignment mark 60 on the color filter substrate 200 is read. For example, as shown in FIG. 4, the alignment mark 60 is irradiated with light L1 for imaging from the transparent substrate 11 side, and the alignment mark is transmitted from the scattering layer 14 side with a camera or the like using the transmitted light of the light L1. 60 is imaged. Alternatively, the light L1 may be irradiated near the alignment mark 60 from the scattering layer 14 side, and the alignment mark 60 may be imaged from the scattering layer 14 side by a camera or the like using the reflected light of the light L1.

  Here, the thickness t3 of the scattering layer 14 on the alignment mark 60 is smaller than the thickness t4 of the scattering layer 14 on the colored layers 20, 30, 40. Therefore, compared to light scattering in the scattering layer 14 on the colored layers 20, 30, 40, light is less likely to be scattered in the scattering layer 14 on the alignment mark 60.

  Therefore, as compared with the example of FIG. 10, the light L <b> 1 is less likely to be scattered by the scattering layer 14 on the alignment mark 60, and the edge of the alignment mark 60 is difficult to burn. Therefore, the alignment mark 60 can be read with high accuracy.

  Further, since the thickness t4 does not affect the blurring of the edge of the alignment mark 60, it can be set to a value that can obtain the necessary scattering characteristics. Therefore, necessary scattering characteristics can be obtained in the colored layers 20, 30, and 40, and display characteristics with a wide viewing angle and display characteristics close to paper can be obtained by effectively scattered light. .

  As described above, according to the present embodiment, the thickness t3 of the scattering layer 14 on the alignment mark 60 is made smaller than the thickness t4 of the scattering layer 14 on the colored layers 20, 30, 40, so that the display characteristics are improved. In the above, a decrease in positioning accuracy can be suppressed.

(Second Embodiment)
The second embodiment is different from the first embodiment in that the color filter includes an alignment mark. Hereinafter, a description will be given focusing on differences from the first embodiment.

  FIG. 5A is a plan view of a color filter substrate 200A according to the second embodiment. The color filter substrate 200 </ b> A has a plurality of active regions 210 arranged on the transparent substrate 11 and arranged in a matrix. In each active region 210, the BM layer 12 and the colored layers 20, 30, and 40 of the color filter 10A are provided. Alignment marks 60 are provided outside the four corners of each active area 210. One active region 210 and four alignment marks 60 correspond to one color filter 10A. That is, each color filter 10 </ b> A includes four alignment marks 60 in addition to the configuration of the first embodiment.

  A longitudinal sectional view taken along the line AA of the color filter substrate 200A is the same as FIG. 4 of the first embodiment.

  FIG. 5B is a plan view of the counter substrate 300A according to the second embodiment. Alignment marks 70 are respectively provided outside the four corners of each electrode formation region 310. The plurality of alignment marks 60 on the color filter substrate 200A are provided at positions corresponding to the plurality of alignment marks 70 on the counter substrate 300A.

  Also in the present embodiment, the alignment marks 60 and 70 may be provided at positions other than the illustrated positions as long as they are other than the active region 210 and the electrode formation region 310, and the number thereof is not limited.

  As a method for manufacturing the electronic paper 100, first, the color filter substrate 200A is cut along the cutting line CL1 in FIG. 5A to obtain a plurality of color filters 10A. Similarly, the counter substrate 300A is cut along the cutting line CL1 in FIG. 5B to obtain the members 80A of the plurality of reflective display elements 80.

  Next, the color filter 10A and the member 80A of the reflective display device 80 are positioned so that the four alignment marks 60 of the color filter 10A and the four alignment marks 70 of the member 80A of the reflective display element 80 overlap. The In this state, the color filter 10A and the member 80A of the reflective display device 80 are bonded together.

  And the electronic paper 100 is completed through a required manufacturing process. That is, in the present embodiment, the alignment marks 60 and 70 are also present on the electronic paper 100.

  A plurality of electronic papers 100 can be manufactured by repeating these steps.

  Also in the present embodiment, since the edge of the alignment mark 60 is difficult to blur, the alignment mark 60 can be read with high accuracy. Therefore, the effect of the first embodiment can be obtained.

(Third embodiment)
The third embodiment is different from the first embodiment in that the alignment mark has a colored layer. Hereinafter, a description will be given focusing on differences from the first embodiment.

  FIG. 6 is a longitudinal sectional view showing a schematic configuration of a color filter substrate 200B according to the third embodiment. 6 corresponds to the longitudinal sectional view of FIG.

  The alignment mark 60A has a colored layer (second colored layer) 30A laminated on the BM layer 61A. The thickness of the BM layer 61A is substantially equal to the thickness t2 of the BM layer 12. Therefore, in the present embodiment, the BM layers 12 and 61A can be formed in the same process without using a multi-tone mask, similarly to the color filter substrate 200X having the configuration of FIG.

  The colored layer 30 </ b> A is formed in the same process using the same material as the colored layer 30. That is, in the manufacturing process of the color filter substrate 200X having the configuration shown in FIG. 10, the color layer 30A can be formed on the BM layer 61A by changing the shape of the mask for exposing the colored layer 30. The filter substrate 200B can be manufactured. Therefore, manufacture is easier than in the first embodiment.

  The thickness t1 of the alignment mark 60A is larger than the thickness t2 of the BM layer 12. Accordingly, also in this embodiment, the thickness t3 of the scattering layer 14 on the alignment mark 60A is smaller than the thickness t4 of the scattering layer 14 on the colored layers 20, 30, and 40. Therefore, the same effect as the first embodiment can be obtained.

  The colored layer laminated on the BM layer 61A may be a layer formed in the same process using the same material as the colored layer 20 or 40.

(Fourth embodiment)
The fourth embodiment differs from the third embodiment in that the alignment mark has a plurality of colored layers. Hereinafter, the difference from the third embodiment will be mainly described.

  FIG. 7 is a longitudinal sectional view showing a schematic configuration of a color filter substrate 200C according to the fourth embodiment. FIG. 7 corresponds to the longitudinal sectional view of FIG.

  The alignment mark 60B includes a plurality of colored layers (second colored layers) 20B, 30B, and 40B stacked on the BM layer 61A. The colored layer 20B is formed in the same process using the same material as the colored layer 20. The colored layer 30 </ b> B is formed in the same process using the same material as the colored layer 30. The colored layer 40B is formed in the same process using the same material as the colored layer 40. Therefore, in the present embodiment, as in the third embodiment, manufacturing is easier than in the first embodiment.

  The thickness t1 of the alignment mark 60B is larger than the thickness t2 of the BM layer 12. Therefore, also in this embodiment, the thickness t3 of the scattering layer 14 on the alignment mark 60B is smaller than the thickness t4 of the scattering layer 14 on the colored layers 20, 30, and 40.

  Therefore, the same effect as the first embodiment can be obtained. Moreover, since the colored layers 20B, 30B, and 40B of a plurality of colors are laminated, the thickness t1 of the alignment mark 60B can be easily increased as compared with the third embodiment.

  Note that the number of the colored layers 20B, 30B, and 40B is not particularly limited.

(Fifth embodiment)
The fifth embodiment is different from the first embodiment in that the color filter substrate has a protective layer. Hereinafter, a description will be given focusing on differences from the first embodiment.

  FIG. 8 is a longitudinal sectional view showing a schematic configuration of a color filter substrate 200D according to the fifth embodiment. FIG. 8 corresponds to the longitudinal sectional view of FIG.

  The color filter substrate 200 </ b> D includes a protective layer (first protective layer) 15 provided on the transparent substrate 11 so as to cover the BM layer 12 and the colored layers 20, 30, and 40. The protective layer 15 protects the colored layers 20, 30, 40 and the BM layer 12 from the external environment, and prevents the impurities contained in the colored layers 20, 30, 40 and the BM layer 12 from flowing out to the outside. it can.

  The alignment mark 60C includes a protective layer (second protective layer) 15A stacked on the BM layer 61A. The protective layer 15 </ b> A is formed in the same process using the same material as the protective layer 15. The thickness of the protective layer 15 </ b> A is larger than the thickness of the protective layer 15 on the BM layer 12. Therefore, exposure may be performed using a multi-tone mask.

  The scattering layer 14 is provided so as to cover the protective layer 15 and the alignment mark 60C. The thickness t1 of the alignment mark 60C is larger than the thickness t2 of the BM layer 12. Since the thickness of the protective layer 15 </ b> A is larger than the thickness of the protective layer 15 on the BM layer 12, the position of the upper end portion of the protective layer 15 </ b> A is positioned on the side opposite to the observer side than the position of the upper end portion of the protective layer 15. doing. Accordingly, also in this embodiment, the thickness t3 of the scattering layer 14 on the alignment mark 60C is smaller than the thickness t4 of the scattering layer 14 on the colored layers 20, 30, and 40. Therefore, the same effect as the first embodiment can be obtained.

(Sixth embodiment)
The sixth embodiment is different from the first embodiment in that the color filter substrate has a spacer. Hereinafter, a description will be given focusing on differences from the first embodiment.

  FIG. 9 is a longitudinal sectional view showing a schematic configuration of a color filter substrate 200E according to the sixth embodiment. FIG. 9 corresponds to the longitudinal sectional view of FIG.

  The color filter substrate 200E includes a columnar spacer (first spacer) 16 provided on the BM layer 12. The spacer 16 is also referred to as a photo spacer. One spacer 16 may be provided for each pixel. The distance between the BM layer 12 and the white substrate 81 of the reflective display element 80 can be kept constant by the spacer 16.

  The scattering layer 14 is provided to cover the BM layer 12, the colored layers 20, 30, 40, the spacer 16, and the alignment mark 60D.

  The alignment mark 60D has a spacer (second spacer) 16A provided on the BM layer 61A. The spacer 16 </ b> A is formed in the same process using the same material as the spacer 16. Therefore, it is not necessary to add a manufacturing process to form the alignment mark 60D.

  The thickness t1 of the alignment mark 60D is larger than the thickness t2 of the BM layer 12. Therefore, also in this embodiment, the thickness t3 of the scattering layer 14 on the alignment mark 60D is smaller than the thickness t4 of the scattering layer 14 on the colored layers 20, 30, and 40. Therefore, the same effect as the first embodiment can be obtained.

Each of the third to sixth embodiments may be applied to the second embodiment. That is, each of the color filters 10B to 10E may include a corresponding alignment mark 60A to 60D.
In the third to sixth embodiments, the thickness of the BM layer 61A may be larger than the thickness t2 of the BM layer 12.

  As mentioned above, although some embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

10, 10A to 10E Color filter 11 Transparent substrate 12 BM layer (first black matrix layer)
14 Scattering layer 15 Protective layer (first protective layer)
15A protective layer (second protective layer)
16 Spacer (first spacer)
16A spacer (second spacer)
20, 30, 40 Colored layer (first colored layer)
20B, 30A, 30B, 40B Colored layer (second colored layer)
60, 60A-60D, 70 Alignment mark 61, 61A BM layer (second black matrix layer)
80 Reflective display element 100 Electronic paper 200, 200A to 200E Color filter substrate 210 Active region 300, 300A Counter substrate 310 Electrode formation region

Claims (9)

A color filter for a display device,
A transparent substrate;
A first colored layer and an alignment mark provided on the transparent substrate;
A scattering layer provided on the transparent substrate so as to cover the first colored layer and the alignment mark,
The thickness of the scattering layer on the alignment mark is a color filter smaller than the thickness of the scattering layer on the first colored layer. A first black matrix layer provided on the transparent substrate and having a plurality of openings formed thereon;
The first colored layer is provided in the plurality of openings of the first black matrix layer;
The color filter according to claim 1, wherein the alignment mark includes a second black matrix layer.   The color filter according to claim 2, wherein a thickness of the second black matrix layer is larger than a thickness of the first black matrix layer.   4. The color filter according to claim 2, wherein the alignment mark has a second colored layer laminated on the second black matrix layer. 5.   4. The color filter according to claim 2, wherein the alignment mark has a plurality of second colored layers stacked on the second black matrix layer. 5. A first protective layer provided on the transparent substrate to cover the first black matrix layer and the first colored layer;
The scattering layer is provided to cover the first protective layer and the alignment mark,
4. The color filter according to claim 2, wherein the alignment mark has a second protective layer stacked on the second black matrix layer. 5. A columnar first spacer provided on the first black matrix layer;
The color filter according to claim 2, wherein the alignment mark has a second spacer provided on the second black matrix layer. The color filter according to any one of claims 1 to 7,
A display element arranged to face the color filter;
A display device comprising: A color filter substrate having a plurality of color filters for a display device,
A transparent substrate;
A first colored layer and an alignment mark provided on the transparent substrate;
A scattering layer provided on the transparent substrate so as to cover the first colored layer and the alignment mark,
The color filter substrate, wherein a thickness of the scattering layer on the alignment mark is smaller than a thickness of the scattering layer on the first colored layer.