JP2016170313A - Color filter and electronic paper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve viewing angle characteristics, and to prevent changes in color corresponding to an observation direction.SOLUTION: A color filter 10 for electronic paper includes: a transparent substrate 11; a coloring layer 13 provided on the transparent substrate; and a scattering layer 14 provided on a side opposite to the transparent substrate of the coloring layer. The coloring layer has a plurality of unit pixels 16 arranged in a matrix shape. Each of the unit pixels includes three coloring areas 20, 30, 40. The scattering layer has a plurality of scattering layer areas 25, 35, 45 respectively corresponding to the coloring areas. The scattering layer areas 25, 35 corresponding to at least the two coloring areas 20, 30 of the three coloring areas have scattering characteristics different from each other. Thus, scattering intensities of the three coloring areas are brought closer to each other.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a color filter for electronic paper and electronic paper.

  In recent years, electronic paper, which is a flat type display device, has been developed. 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.

  In addition, as electronic paper capable of color display, one having 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, a patent) Reference 1). 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.

JP 2003-280044 A

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

  FIG. 6 is a diagram showing scattering characteristics of a conventional color filter. FIG. 6 shows that when the scattering layer is not provided on the color filter and when the scattering layer is provided, the color filter is arranged between the light source and the light receiver, and the light receiving angle of the light receiver is ± 30. It shows the results of measuring the scattering intensity of red, green, and blue light while changing in the range of °. As shown in FIG. 6, the scattering intensity of red, green, and blue light when the light receiving angle is about 6 ° or more and about −6 ° or less is almost 0 when the scattering layer is not provided. It is increasing when there is.

  However, in the configuration having the scattering layer, the red, green, and blue light scattering intensities are substantially equal when the light receiving angle is near 0 °, but red and green when the light receiving angle is about 6 ° or more and about −6 ° or less. The difference in the scattering intensity of blue light increases. In other words, in the light receiving angle within this range, the scattering intensity varies depending on the wavelength. Therefore, the observed color changes between when the electronic paper is observed from the front direction and when observed from the oblique direction.

  The present invention has been made in consideration of such points, and an object of the present invention is to provide a color filter and electronic paper that can improve viewing angle characteristics and can suppress a change in color according to an observation direction. .

The color filter for electronic paper according to an embodiment of the present invention,
A transparent substrate;
A colored layer provided on the transparent substrate;
A scattering layer provided on the opposite side of the colored layer from the transparent substrate,
The colored layer has a plurality of unit pixels arranged in a matrix,
Each unit pixel includes a coloring area of three colors,
The scattering layer has a plurality of scattering layer areas corresponding to the colored areas of each color,
The scattering layer areas corresponding to the colored areas of at least two of the three colors have different scattering characteristics, thereby making the scattering intensities of the colored areas of the three colors close to each other.

In the above color filter,
The scattering layer is
Transparent resin,
Scattering particles dispersed in the transparent resin,
The plurality of scattering layer areas have the same thickness,
The scattering layer areas having different scattering characteristics may have different concentrations of the scattering particles.

In the above color filter,
The scattering layer is
Transparent resin,
Scattering particles dispersed in the transparent resin,
The plurality of scattering layer areas have the same concentration of the scattering particles,
The scattering layer areas having different scattering characteristics may have different thicknesses.

In the above color filter,
The scattering layer is
Transparent resin,
Scattering particles dispersed in the transparent resin,
The colored areas of at least two of the three colors have different thicknesses,
The plurality of scattering layer areas have the same surface, and the concentration of the scattering particles is the same,
The scattering layer areas having different scattering characteristics may have different thicknesses.

Electronic paper according to an embodiment of the present invention,
The color filter;
A reflective display element that performs white display and black display, disposed so as to face the color filter;
It is characterized by providing.

  According to the present invention, it is possible to improve viewing angle characteristics and to suppress a change in color according to the viewing direction.

It is a longitudinal cross-sectional view which shows schematic structure of the electronic paper which concerns on 1st Embodiment. It is the top view which looked at the color filter from the arrow I direction of FIG. It is a figure which shows the scattering characteristic of the color filter of FIG. It is a longitudinal cross-sectional view which shows schematic structure of the color filter which concerns on 2nd Embodiment. It is a longitudinal cross-sectional view which shows schematic structure of the color filter which concerns on 3rd Embodiment. It is a figure which shows the scattering characteristic of the conventional color filter.

  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 100 will be described with reference to FIG.

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 black matrix layer (hereinafter referred to as a BM layer) 12 provided on the transparent substrate 11, and a plurality of colored layers 13 provided on the transparent substrate 11. The scattering layer 14 provided on the opposite side to the transparent base material 11 of the colored layer 13, that is, on the reflective display element 80 side of the colored layer 13.

  The colored layer 13 includes a first colored area 20, a second colored area 30, a third colored area 40, and a white area 50. Each of the first colored area 20, the second colored area 30, the third colored area 40, and the white area 50 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.

Color Filter Next, the color filter 10 will be described in detail with reference to FIG. FIG. 2 is a plan view of the color filter 10 as viewed from the direction of arrow I in FIG. For convenience of explanation, the scattering layer 14 is omitted in FIG. The cross-sectional view of the color filter 10 in FIG. 1 corresponds to the AA cross section in FIG.

(Transparent substrate)
As the transparent substrate 11, various materials that can appropriately support the BM layer 12, the colored layer 13, and the scattering layer 14 and have transparency are used. For example, glass or polymer 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 plurality of regions defined by the BM layer 12 are any one of a region for the first colored area 20, a region for the second colored area 30, a region for the third colored area 40, and a region for the white area 50, respectively. It has become. The specific pattern of each region defined by the BM layer 12 is not particularly limited.

  The material of the BM layer 12 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.

(Colored layer)
As shown in FIG. 2, the colored layer 13 includes a plurality of unit pixels 16 arranged in a matrix. Each unit pixel 16 includes three colored areas (a first colored area 20, a second colored area 30, and a third colored area 40) and a white area 50, which are arranged in a matrix. Below, when it is not necessary to distinguish the 1st coloring area 20, the 2nd coloring area 30, and the 3rd coloring area 40 from each other, these are called the coloring areas 20, 30, and 40.

  The colored areas 20, 30, 40 and the white area 50 are provided between regions defined by the BM layer 12, that is, between the BM layers 12. The thicknesses of the colored areas 20, 30, 40 and the white area 50 are substantially equal.

  The first coloring area 20, the second coloring area 30, the third coloring area 40, and the white area 50 are repeatedly arranged in this order in the x direction. A plurality of sets of the colored areas 20, 30, 40 and the white area 50 that are repeatedly arranged in this way are arranged in the y direction. The arrangement order of the colored areas 20, 30, 40 and the white area 50 is not limited to the example illustrated.

  For example, the 1st coloring area 20 consists of a blue coloring layer which permeate | transmits blue light, the 2nd coloring area 30 consists of a green coloring layer which permeate | transmits green light, and the 3rd coloring area 40 permeate | transmits red light. It consists of a red colored layer.

  The white area 50 includes a white colored layer that transmits white light. More specifically, the white area 50 transmits visible light substantially uniformly regardless of the wavelength range. Therefore, the visible light transmittance of the white area 50 is higher than the visible light transmittance of the colored areas 20, 30, 40.

  By providing the white area 50 having such a high transmittance, the transmittance of the color filter 10 as a whole can be improved as compared with the case where only the colored areas 20, 30 and 40 are provided in the color filter 10. it can. Thereby, the brightness of the electronic paper 100 can be increased.

  Each of the colored areas 20, 30, 40 and the white area 50 is a layer formed by patterning a photosensitive colored area material by a photolithography method including an exposure process and a development process. As the coloring area material to be patterned by the photolithography method, any of negative and positive coloring area materials can be used. The order of forming the colored areas 20, 30, 40 and the white area 50 may be any order.

[Coloring area materials]
Next, a first colored area material (hereinafter referred to as a first material), a second colored area material (hereinafter referred to as a second material), and a third colored area constituting each colored area 20, 30, 40 and white area 50. Materials for use (hereinafter referred to as third material) and white area materials (hereinafter referred to as fourth material) will be described. Each of the first to fourth 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, and a surfactant. 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 area 20, 30, 40 and white area 50 is configured to transmit light of the corresponding color, while the BM layer 12 is configured to shield light.

(Scattering layer)
As shown in FIG. 1, the scattering layer 14 has a plurality of scattering layer areas 25, 35, 45, 55 corresponding to the colored areas 20, 30, 40 of each color and the white area 50. Specifically, the scattering layer area 25 corresponds to the first colored area 20 and is provided on the first colored area 20. The scattering layer area 35 corresponds to the second colored area 30 and is provided on the second colored area 30. The scattering layer area 45 corresponds to the third colored area 40 and is provided on the third colored area 40. The scattering layer area 55 corresponds to the white area 50 and is provided on the white area 50.

  The thicknesses of the scattering layer areas 25, 35, 45, and 55 are substantially the same at positions corresponding to the colored areas 20, 30, and 40 and the white area 50. Therefore, the surface of the scattering layer areas 25, 35, 45, 55 opposite to the colored layer 13 is substantially flush. Thereby, the reliability of joining of the scattering layer 14 and the reflective display element 80 can be improved.

  The scattering layer areas corresponding to the colored areas of at least two of the three colors have different scattering characteristics. In the illustrated example, the two scattering layer areas 25 and 35 corresponding to the two colored first colored areas 20 and the second colored areas 30 have different scattering characteristics. The scattering layer area 45 corresponding to the third coloring area 40 has substantially the same scattering characteristics as the scattering layer area 35 corresponding to the second coloring area 30. The scattering layer area 55 corresponding to the white area 50 has substantially the same scattering characteristics as the scattering layer area 25 corresponding to the first colored area 20. As a result, the scattering intensities of the three colored areas 20, 30, 40 and the white area 50 are made closer to each other.

  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 17 and scattering particles 18 that are dispersed in the transparent resin 17 and exhibit a light scattering action.

  The scattering layer areas 25 and 35 having different scattering characteristics have different concentrations of the scattering particles 18. The scattering layer areas 25 and 55 have substantially the same concentration of the scattering particles 18, and the scattering layer areas 35 and 45 have the same concentration of the scattering particles 18. Here, the concentration of the scattering particles 18 in the scattering layer areas 25 and 55 is lower than the concentration of the scattering particles 18 in the scattering layer areas 35 and 45.

  The transparent resin 17 is not particularly limited as long as it has transparency, and is appropriately selected in consideration of the refractive index difference from the scattering particles 18 and the like. Examples of the transparent resin 17 include acrylic resins and epoxy resins.

  The material of the scattering particles 18 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.

  The scattering particles 18 are preferably transparent. This is because the transmittance of the scattering layer 14 can be improved. As such scattering particles 18, for example, a melamine resin, a benzoguanamine resin, or the like may be used.

  The average particle diameter of the scattering particles 18 is, for example, in the range of 100 nm or more and 600 nm or less. The shape of the scattering particles 18 may be spherical, for example. The refractive index of the scattering particles 18 may be larger than the refractive index of the transparent resin 17. The content of the scattering particles 18 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.

  Each of the scattering layer areas 25, 35, 45, and 55 contains the transparent resin 17 and the scattering particles 18 after the colored areas 20, 30, and 40 and the white area 50 are formed, and has a photosensitive scattering layer formation. You may form by apply | coating a coating liquid on the colored layer 13, and patterning by the photolithographic method including an exposure process and a image development process. In the illustrated example, two types of scattering layer forming coating liquids having different concentrations of the scattering particles 18 are used. For example, after the scattering layer areas 25 and 55 are formed, the scattering layer areas 35 and 45 may be formed.

  FIG. 3 is a diagram showing the scattering characteristics of the color filter 10 of FIG. FIG. 3 shows the result of measuring the scattering intensity of red, green, and blue light by arranging the color filter 10 between the light source and the light receiver, changing the light receiving angle of the light receiver within a range of ± 30 °. Show. 3 and 6, the vertical scale is the same.

  As shown in FIG. 3, when the light receiving angle is about 6 ° or more and about −6 ° or less, the red, green, and blue light scattering intensities are substantially equal, and the difference is smaller than the conventional one in FIG. Therefore, the observed color hardly changes between when the electronic paper 100 is observed from the front direction and when observed from the oblique direction.

  As described above, according to the present embodiment, the scattering layer areas corresponding to the colored areas of at least two of the three colors have different scattering characteristics, so that the scattering intensities of the respective colors are made close to each other regardless of the observation direction. Can do. As a result, the viewing angle characteristics can be improved and the change in color according to the viewing direction can be suppressed.

  In addition, since the white area 50 having a higher transmittance than the colored areas 20, 30, 40 is provided, the amount of light taken out to the observer side is increased, and a decrease in luminance due to scattering can be suppressed.

  Note that the three scattering layer areas 25, 35, and 45 corresponding to the three colored areas 20, 30, and 40 may have different scattering characteristics. Further, the four scattering layer areas 25, 35, 45, and 55 may have different scattering characteristics. What kind of scattering characteristics are given to each of the scattering layer areas 25, 35, 45, and 55 is such that the thickness and scattering of the scattering layer areas 25, 35, 45, and 55 can be made close to each other. What is necessary is just to set suitably according to the density | concentration of the particle | grains 18, etc.

  Further, when the decrease in luminance due to scattering is small, the white area 50 may not be provided.

(Second Embodiment)
In the second embodiment, the configuration of the scattering layer 14A is different from that of the first embodiment. Hereinafter, a description will be given focusing on differences from the first embodiment.

  FIG. 4 is a longitudinal sectional view showing a schematic configuration of a color filter 10A according to the second embodiment. Also in this embodiment, the scattering layer areas corresponding to the colored areas of at least two of the three colors have different scattering characteristics. In the example of FIG. 4, the two scattering layer areas 25 </ b> A and 35 </ b> A corresponding to the two colored first colored areas 20 and the second colored area 30 have different scattering characteristics. The scattering layer area 45 </ b> A corresponding to the third colored area 40 has substantially the same scattering characteristics as the scattering layer area 35 </ b> A corresponding to the second colored area 30. The scattering layer area 55 </ b> A corresponding to the white area 50 has substantially the same scattering characteristics as the scattering layer area 25 </ b> A corresponding to the first colored area 20. As a result, the scattering intensities of the three colored areas 20, 30, 40 and the white area 50 are made closer to each other.

  In the plurality of scattering layer areas 25A, 35A, 45A, and 55A, the concentration of the scattering particles 18 is substantially the same. The scattering layer areas 25A and 35A having different scattering characteristics have different thicknesses t1 and t2. The scattering layer areas 25A and 55A have a substantially equal thickness t1, and the scattering layer areas 35A and 45A have a substantially equal thickness t2. Here, the thickness t1 of the scattering layer areas 25A and 55A is thinner than the thickness t2 of the scattering layer areas 35A and 45A.

  With such a configuration, the number of scattering particles 18 included in each scattering layer area 25A, 55A is smaller than the number of scattering particles 18 included in each scattering layer area 35A, 45A. Accordingly, the scattering characteristics can be made different.

  The scattering layer areas 25A, 35A, 45A, and 55A include the transparent resin 17 and the scattering particles 18 after the colored areas 20, 30, 40, and the white area 50 are formed. You may form by apply | coating a liquid on the colored layer 13, and patterning by the photolithographic method including an exposure process and a image development process. For example, one type of scattering layer forming coating solution may be applied, and exposure may be performed using a multi-tone mask such as a halftone mask. Thereby, the exposure amount can be varied for each region where the scattering layer areas 25A, 35A, 45A, and 55A are formed. Therefore, the scattering layer areas 25A, 35A, 45A, and 55A can be formed with different thicknesses by development.

  As described above, according to the present embodiment, as in the first embodiment, the scattering layer areas corresponding to the colored areas of at least two of the three colors have different scattering characteristics, and thus the same as in FIG. In addition, the scattering intensities of the respective colors can be made close to each other regardless of the observation direction. As a result, the viewing angle characteristics can be improved and the change in color according to the viewing direction can be suppressed.

Further, since the scattering layer areas 25A, 35A, 45A, and 55A have substantially the same concentration of the scattering particles 18, they can be formed using the same scattering layer forming coating solution. Therefore, the material cost of the scattering layer forming coating solution can be reduced as compared with the first embodiment.
Moreover, the other effect of 1st Embodiment is also acquired.

  Note that the scattering layer areas 25A, 35A, 45A, and 55A may be formed by photolithography for each of those having the same scattering characteristics. That is, in this method, photolithography is performed twice or more for forming the scattering layer 14A. In this case, the scattering layer forming coating solution may be one kind, and it is not necessary to use a multi-tone mask. Therefore, compared with the manufacturing method using the multi-tone mask described above, the cost of the mask can be reduced, but the number of times of photolithography is increased.

  Similarly to the first embodiment, the scattering layer areas 25A, 35A, 45A, and 55A are provided with different scattering characteristics so that the scattering intensities of the respective colors can be made closer to each other. , 35A, 45A, 55A, the concentration of the scattering particles 18 and the like.

(Third embodiment)
In 3rd Embodiment, the structure of the colored layer 13B and the scattering layer 14B differs from 1st Embodiment. Hereinafter, a description will be given focusing on differences from the first embodiment.

  FIG. 5 is a longitudinal sectional view showing a schematic configuration of a color filter 10B according to the third embodiment. Colored areas of at least two of the three colors have different thicknesses. In the example of FIG. 5, the two colored first colored areas 20B and the second colored areas 30B have different thicknesses t3 and t4. Here, the thickness t3 of the colored areas 20B and 50B is thicker than the thickness t4 of the colored areas 30B and 40B. The colored areas 20B and 50B have a substantially equal thickness t3, and the scattering layer areas 35B and 45B have a substantially equal thickness t6.

  Thus, the thickness t3 of the colored areas 20B and 50B is thicker than the thickness t4 of the colored areas 30B and 40B. Therefore, for example, when the thickness t3 of the colored area 20B is thicker than the thickness of the colored area 20 of the first embodiment, the concentration of the pigment contained in the colored area 20B is made lower than that of the first embodiment. You may adjust so that the blue light obtained by the coloring area 20B may become comparable as 1st Embodiment. The other colored areas 30B and 40B can be similarly adjusted.

  Also in this embodiment, the scattering layer areas corresponding to the colored areas of at least two of the three colors have different scattering characteristics. In the example of FIG. 5, the scattering layer areas 25B and 35B corresponding to the two colored first colored areas 20B and the second colored area 30B have different scattering characteristics. The scattering layer area 45B corresponding to the third coloring area 40B has substantially the same scattering characteristics as the scattering layer area 35B corresponding to the second coloring area 30B. The scattering layer area 55B corresponding to the white area 50B has substantially the same scattering characteristics as the scattering layer area 25B corresponding to the first colored area 20B. As a result, the scattering intensity of the three colored areas 20B, 30B, 40B and the white area 50B are brought close to each other.

  The plurality of scattering layer areas 25 </ b> B, 35 </ b> B, 45 </ b> B, and 55 </ b> B have the same surface, and the concentration of the scattering particles 18 is substantially the same. That is, the plurality of scattering layer areas 25 </ b> B, 35 </ b> B, 45 </ b> B, 55 </ b> B are integrally and continuously formed, and the surface on the reflective display element 80 side is substantially parallel to the surface of the transparent substrate 11. Thereby, the reliability of joining of the scattering layer 14B and the reflective display element 80 can be improved.

  As a result, the scattering layer areas 25B and 35B having different scattering characteristics have different thicknesses t5 and t6. The scattering layer areas 25B and 55B have a substantially equal thickness t5, and the scattering layer areas 35B and 45B have a substantially equal thickness t6. Here, the thickness t5 of the scattering layer areas 25B and 55B is thinner than the thickness t6 of the scattering layer areas 35B and 45B.

  With this configuration, the number of scattering particles 18 included in each scattering layer area 25B, 55B is smaller than the number of scattering particles 18 included in each scattering layer area 35B, 45B. Accordingly, the scattering characteristics can be made different.

  The colored areas 20B, 30B, 40B and the white area 50B can be formed by a photolithography method as in the first embodiment. However, for each of the colored areas 20B, 30B, 40B and the white area 50B, the coating amount of the coating liquid containing the coloring area material and the exposure conditions are changed, and the thickness t3 of the colored areas 20B, 50B is changed to the colored area 30B. , 40B to be thicker than the thickness t4.

  The scattering layer 14B can be formed by forming the colored areas 20B, 30B, 40B and the white area 50B, and then applying the scattering layer forming coating liquid on the colored layer 13B and curing it. By applying the liquid scattering layer forming coating solution, the surface of the scattering layer forming coating solution becomes flat, so that the surface of the scattering layer 14B can be formed flat as described above. As a result, the thickness t5 of the scattering layer areas 25B and 55B is thinner than the thickness t6 of the scattering layer areas 35B and 45B.

  As described above, according to the present embodiment, as in the first embodiment, the scattering layer areas corresponding to the colored areas of at least two of the three colors have different scattering characteristics, and thus the same as in FIG. In addition, the scattering intensities of the respective colors can be made close to each other regardless of the observation direction. As a result, the viewing angle characteristics can be improved and the change in color according to the viewing direction can be suppressed.

Further, since the scattering layer areas 25B, 35B, 45B, and 55B have substantially the same concentration of the scattering particles 18, they can be formed using the same scattering layer forming coating solution. Further, the scattering layer areas 25B, 35B, 45B, and 55B can be formed in the same process. Therefore, the manufacturing cost can be reduced as compared with the first embodiment.
Moreover, the other effect of 1st Embodiment is also acquired.

  Similar to the first embodiment, the scattering layer area 25B, 35B, 45B, and 55B has different scattering characteristics depending on the scattering layer area 25B so that the scattering intensities of the respective colors can be made closer to each other. , 35B, 45B, 55B, the concentration of the scattering particles 18 and the like.

  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, 10B Color filter 11 Transparent substrate 12 Black matrix layer (BM layer)
13, 13B Colored layers 14, 14A, 14B Scattering layer 16 Unit pixel 17 Transparent resin 18 Scattered particles 20, 20B First colored area 30, 30B Second colored area 40, 40B Third colored area 50, 50B White area 25, 25A , 25B, 35, 35A, 35B, 45, 45A, 45B, 55, 55A, 55B Scattering layer area 80 Reflective display element 100 Electronic paper

Claims (5)

A color filter for electronic paper,
A transparent substrate;
A colored layer provided on the transparent substrate;
A scattering layer provided on the opposite side of the colored layer from the transparent substrate,
The colored layer has a plurality of unit pixels arranged in a matrix,
Each unit pixel includes a coloring area of three colors,
The scattering layer has a plurality of scattering layer areas corresponding to the colored areas of each color,
The scattering layer area corresponding to the colored area of at least two of the three colors has mutually different scattering characteristics, thereby making the scattering intensity of the colored areas of the three colors close to each other. . The scattering layer is
Transparent resin,
Scattering particles dispersed in the transparent resin,
The plurality of scattering layer areas have the same thickness,
The color filter according to claim 1, wherein the scattering layer areas having different scattering characteristics have different concentrations of the scattering particles. The scattering layer is
Transparent resin,
Scattering particles dispersed in the transparent resin,
The plurality of scattering layer areas have the same concentration of the scattering particles,
The color filter according to claim 1, wherein the scattering layer areas having different scattering characteristics have different thicknesses. The scattering layer is
Transparent resin,
Scattering particles dispersed in the transparent resin,
The colored areas of at least two of the three colors have different thicknesses,
The plurality of scattering layer areas have the same surface, and the concentration of the scattering particles is the same,
The color filter according to claim 1, wherein the scattering layer areas having different scattering characteristics have different thicknesses. The color filter according to any one of claims 1 to 4,
A reflective display element that performs white display and black display, disposed so as to face the color filter;
Electronic paper characterized by comprising.

Images