JP2018077425A - Reflection type display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reflection type display device capable of displaying a plurality of colors simultaneously realizing vividness and brightness.SOLUTION: A reflection type display device includes: a reflection type display layer having a plurality of pixel electrodes and configured to display black and white; and a color filter of at least three colors having a plurality of pixels corresponding to the pattern of the pixel electrodes. The color filter has a predetermined first color, a second color with a hue angle difference of 65 degrees to 120 degrees inclusive, or -120 degrees to -65 degrees inclusive, with regard to the first color, and a third color and so on having a hue angle between a hue angle of the first color and a hue angle of the second color.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a reflective display device.

As a display device, a transmission type or a reflection type comprising a display unit capable of changing the transmittance or the reflectance for each display unit, and a color filter in which a colored layer is arranged to face each display unit of the display unit. Display devices are known.
For example, a transmissive liquid crystal display device using a backlight is known as a transmissive display device. The transmissive liquid crystal display device is not suitable for applications in which the user directly sees the light transmitted through the color filter, which places a heavy burden on the user's eyes and allows the user to look at the display screen for a long time .
In contrast, the reflective display device performs color display by reflecting external light such as natural light incident on the color filter by a reflective display unit facing the color filter. For this reason, the reflective display device is less burdensome on the user's eyes than the transmissive display device, and is more suitable for the work of the user looking at the display screen for a long time. A reflective display device can be configured without a built-in display light source, and thus consumes less power.
As an example of the reflective display device, for example, a device including a reflective display unit such as an electrophoretic method or a twist ball method has been proposed. Such a reflective display device is attracting attention as a display device close to a paper display medium because it displays characters and images by reflected light of external light in the same manner as a printed paper surface.

  Patent Document 1 proposes a method of colorizing a reflection type device using a color filter.

  In Patent Document 2, when the first display color is displayed by forming the colored pixels having only two colors that are not in the complementary color relationship, the two display colors are further mixed when the second display color is displayed. A method for providing a vivid color in the third display color has been proposed.

  In the color filter of Patent Document 2, by limiting the colors that can be developed, it is compared with the method of using primary colors such as RED, GREEN, BLUE, or MAGENTA, CYAN, YELLOW represented by Patent Document 1 as sub-pixels. In addition, a reflective display device capable of displaying bright and vivid color filters has been provided.

JP 2003-161964 A International Publication No. 2015/045357

  However, the color filter that forms the colored pixels with only two colors proposed in Patent Document 2 needs to erase at least the second color when the first color is developed. Therefore, the maximum area of the pixels that can be used when the first color is developed is only ½, which is dark. The second color also became dark for the above reasons, and it was difficult to realize a sufficiently bright and vivid color.

  An object of the present invention is to provide a color filter capable of displaying a plurality of colors capable of realizing bright and vivid colors.

  One aspect of the present invention includes a reflective display layer that has a plurality of pixel electrodes and displays white and black, and a color filter of at least three colors that has a pattern composed of a plurality of pixels corresponding to the pattern of the pixel electrodes. The color filter includes a second color whose hue angle difference between the predetermined first color and the first color is 65 degrees or more and 120 degrees or less, or -120 degrees or more and -65 degrees or less; A reflective display device having third and subsequent colors having a hue angle between a hue angle of a first color and a hue angle of a second color.

  The color filter has only three colors, and the hue angle of the third color is -15 degrees or more from the hue angle intermediate between the hue angle of the first color and the hue angle of the second color, and It may be 15 degrees or less.

  Further, the pixel may be composed of 3 or more and 25 or less sub-pixels.

  In addition, in the first color and the second color, the ratio of the colored portion in one pixel may be 20% or more and 40% or less.

  Further, the ratio of the non-colored portion in the pixel may be 40% or less.

  According to the present invention, it is possible to provide a reflective display device capable of displaying a plurality of colors that achieve both vividness and brightness.

Cross-sectional view of a reflective display device The figure which shows the 1st color range in the L * a * b * color system, the 2nd color range, and the 3rd and subsequent color ranges Example of unit pixel of reflective display device

  Hereinafter, a reflective display device according to an embodiment of the present invention will be described with reference to the drawings.

  A schematic cross-sectional view of a reflective display device 100 according to this embodiment is shown in FIG. The reflective display device 100 includes a display device substrate 1, a pixel electrode 2, an adhesive layer 3, a reflective display layer 4, a transparent electrode layer 5, a film layer 6 with a transparent electrode, an adhesive layer 11, and color filter layers 7, 8, 9. The image receiving layer 10 and the protective film 12 are provided. The reflective display device 100 includes a reflective display layer 4 in which white and black displays are driven by a plurality of pixel electrodes 2, and a pixel pattern corresponding to the pattern of the pixel electrode 2 (a plurality of pixels including a plurality of subpixels). The color filter 7, 8, 9 has a color display. In FIG. 1, the laminated body in the range from the substrate 1 to the film layer 11 with a transparent electrode constitutes a black and white display type reflective display device. Each pixel of the color filters 7, 8, and 9 represents a colored portion that indicates the first color, a colored portion that indicates the second color, and a colored portion that indicates the third color as colored pixels. The color allocation is not limited to this shape, and in some cases, the fourth and subsequent colored portions indicating the hue angle between the first color and the second color may be arranged, or a transparent subpixel In order to function as, it is not necessary to provide a colored portion.

  The reflective display layer 4 can use an electrophoretic method or a twist ball, but any method can be used as long as the display can be switched by an electric field.

  The color filter of this embodiment can be formed by a photolithographic method, an offset printing method, an ink jet method, or the like, but any method can be used as long as a colored portion can be regularly formed at a target position in a subpixel.

  Pigment Red 9, 19, 38, 43, 97, 122, 123, 144, 149, 166, 168, 177, 179, 180, 192, 208, 215, 216, 217, 220, 223, 224 are used in the colored portion. , 226, 227, 228, 240, 254, PigmentBlue 15, 15: 3, 15: 6, 16, 22, 29, 60, 64, PigmentGreen 7, 36, Pigment Orange 36, Pigment Violet 23, Pigment Yellow 150, and the like. It is not limited. In order to adjust the hue angle, two or more of the pigments may be mixed.

  The hue angle (h) is expressed by equations (1) to (3) when the color is expressed in the L * a * b * color system. The difference in hue angle between the first color and the second color is obtained by the difference in hue angle between the first color and the second color.

  FIG. 2 shows the range of the second hue angle (hue angle of the second color) relative to the first hue angle (hue angle of the first color), and the third and subsequent hue angles (third and subsequent colors). An example of the range of the hue angle) is shown in the L * a * b * color system. In FIG. 2, the first hue angle 22 is set to 45 °, but this value can be freely set in the range of 0 ° to 360 °. When the first hue angle 22 is 45 °, the range that the second hue angle can take is 285 ° to 340 ° (second hue angle range (a) 23), or 110 ° to 175 ° (second (B) 24). The range that the third and subsequent hue angles can take is between the first hue angle and the second hue angle (inside the smaller sector formed by the first hue angle, the second hue angle, and the origin). In the case of the second hue angle range (a) 23, the second hue angle is 355 ° (−5 °) to 30 ° (the hue angle range (a) 25 of the third color). In the case of the range (b) 24, the angle is preferably 60 ° to 95 ° (the hue angle range (b) 26 of the third color). By adjusting the hue angle within this range, a bright and vivid display can be realized in the first coloring state, the second coloring state, and the third coloring state.

  FIG. 3 shows an example of the arrangement of the first color, the second color, and the third color corresponding to the sub-pixel separator and the sub-pixel constituting one pixel. In order to color at least the first color, the second color, and the third color in one pixel, three or more sub-pixels for constituting one pixel are necessary. The example (a) of FIG. 3 is an example in which the pixels are divided into three stripe-like sub-pixels, and the first color, the second color, and the third color pixels 7, 8, and 9 are colored. The subpixels do not have to be striped, and can be divided into islands as shown in the example (b) of FIG. A part of the non-colored pixels 28 may be used. Further, as shown in the example (c) of FIG. 3, a fourth pixel having a color different from the third color between the first hue angle and the second hue angle is formed in a part of the sub-pixels divided into island shapes. Color pixels 27 may be arranged. In order to form a striped color filter in a monochrome reflection type display device in which the subpixels are square in advance, one pixel is formed by nine subpixels as shown in the example (d) of FIG. Alternatively, the same color, for example, the first color may be arranged linearly in the lateral direction, and another color, for example, the second color, as well as the third color may be colored in adjacent columns. At this time, in order to improve the brightness at the time of color development, the non-colored pixels 28 may be arranged (example (e) in FIG. 3). Further, the balance of the arrangement of the colors does not have to be uniform. For example, the coloring area ratio of the first color may be increased (example (f) in FIG. 3). The number of subpixels may be increased to 25 as in the example (g) of FIG. When the number of sub-pixels exceeds 25, the resolution of the display device deteriorates. As in the example (g) of FIG. 3, for example, the first and second colors are arranged in 10 sub-pixels (40%) out of 25 sub-pixels, and the third and subsequent colors are arranged in 5 places. By arranging the sub-pixels (20%), first and second coloring states to be described later can be created with a base area of 60%. At that time, the base area that can be used to develop the first and second colors is 40%, and a coloring state in which saturation is emphasized can be realized. In addition, when the brightness is more important than the saturation, a non-colored portion can be added as in the example (h) of FIG. Furthermore, as in the example (i) of FIG. 3, the fourth and subsequent colors can also be added.

  The hue angle between the first color and the second color having a hue angle difference of 65 degrees or more and 120 degrees or less, or -120 degrees or more and -65 degrees or less between an arbitrary first color and the first color It is preferable to have the third and subsequent colors having a hue angle between that and the hue angle of the second color. In this way, since the third and subsequent colors are intermediate hues between the first color and the second color, the first color and the third and subsequent colors are brought into a colored state, and only the second color is erased. The color when the color is changed (first color development state), the color when the second color and the third and subsequent colors are colored, and the color when only the first color is erased (second color development state); A color development state in which all the pixels are in a color development state and the color (third color development state) when the first color, the second color, and the mixed color of the third and subsequent colors are displayed can be clearly distinguished. Can be used properly. At this time, the area of pixels necessary for displaying these colors can be made larger than 1/2. By using a large area and coloring, a bright and vivid color can be realized. When the hue angle difference between the first color and the second color is larger than −65 degrees and smaller than 65 degrees, the color difference between the first coloring state, the second coloring state, and the third coloring state is small. It becomes difficult to express the difference in color. On the other hand, when the hue angle difference is larger than 120 degrees or smaller than −120 degrees, the color difference between the third and subsequent colors is the first color and / or the second color when color is developed. Since it becomes large, the saturation is lowered when mixing with the third and subsequent colors.

  If the number of sub-pixels for constituting one pixel is 3 or more, the third and subsequent colors can be arranged in the sub-pixels. Furthermore, the coloring area can be adjusted by arranging the first color and / or the second color in a plurality of sub-pixels in one pixel. This makes it possible to achieve the required color with high reproducibility, such as arranging the color to be emphasized over many pixels, or securing pixels that are not colored to obtain brightness. When the number of sub-pixels is 2 or less, the third and subsequent colors cannot be arranged. When the number of sub-pixels exceeds 25, the area of one pixel increases and the resolution deteriorates.

  Further, when the ratio of the area of the colored portion in one pixel of the first and second colors is 20% or more and 40% or less, a bright and vivid color can be realized. If it is less than 20%, vivid colors will not be produced. On the other hand, if it exceeds 40%, at least 40% of the pixels need to be erased in the first color development state and / or the second color development state, so that brightness cannot be obtained.

  Further, when the ratio of the area of the non-colored portion in one pixel is 40% or less, the saturation at the time of color development can be improved. When it is 40% or more, the ratio of the colored portion is reduced and sufficient saturation cannot be obtained.

  In addition, when the third color has a color of -15 degrees or more and 15 degrees or less from a hue angle intermediate between the first hue angle and the second hue angle, the third color is changed to the first hue angle. By being positioned between the corner and the second hue, it is possible to contribute to improving the brightness and saturation of the first coloring state and the second coloring state. If the hue angle of the third color is outside the range of the angle, it contributes only to either the first color development state or the second color development state, adversely affects either one, and the saturation decreases. To do.

  In the reflective display devices according to the examples and the comparative examples, the number of sub-pixels, the hue angle of ink, and the use range of the sub-pixel of each ink are made different as shown in Table 1, and the first and second color developments are made. Brightness, resolution, and brightness were judged. The results in each Example and Comparative Example are summarized in Table 2. Details are described below.

Example 1
In the reflective display device shown in FIG. 1, a black and white reflective display device that does not include the protective film 12 from the image receiving layer 11 and performs only monochrome display was prepared. The width of one pixel (without a color filter) of the monochrome reflection display device is 217 μm × 217 μm, and the number of pixels is 400 on the x axis and 600 on the y axis.

  In order to colorize the black and white reflective display device, a color filter was installed. The color filter was formed by an ink jet method.

  In order to form a color filter by the inkjet method, an image receiving layer 11 was formed on a black and white reflective display device. The image receiving layer was coated with 12 parts by weight of urethane resin, 20 parts by weight of toluene, 40 parts by weight of isopropyl alcohol and 28 parts by weight of γ-butyrolactone with a blade coater at a gap of 100 μm, and then at 70 ° C. for 5 minutes. Dried. The dry thickness of the image receiving layer was 10 μm.

  Colored pixels were formed on the formed image receiving layer using an inkjet method. After forming the colored pixels, the first color development state and the second color development state were set, and the color in the L * a * b * color system was measured using a spectral color difference meter NF333 manufactured by Nippon Denshoku Industries Co., Ltd.

  The reflective display device has a saturation C of 30 or more, a color difference ΔEab between the first color development and the second color development of 15 or more, a sufficient brightness at the time of color development, and no problem with resolution. Judgment was made, and samples satisfying these conditions were judged as (判定) shown in Table 2, and samples that could not be satisfied were judged as (x). The brightness at the time of color development is greatly influenced by the hue (for example, in the case of green, the reflectivity tends to be high, and the red and blue colors tend to be low in reflectivity). In addition, sensory evaluation was also performed for the resolution.

  There were three sub-pixels, and each usage range was 33%. The hue angles were adjusted so that the first color was 45 °, the second color was 125 °, and the third color was 90 °.

  The first color is 0.23 parts by weight of Pigment Yellow 150 as a pigment, 0.68 parts by weight of Pigment Red 254, 0.49 parts by weight of a dispersant, 28.60 parts by weight of melamine resin as a solid content, and carbitol acetate as a solvent. Mixing 70 parts by weight, a first color ink was produced.

  The second color is 0.51 part by weight of Pigment Yellow 150 as pigment, 0.26 part by weight of Pigment Green 36, 0.54 part by weight of dispersant, 28.68 parts by weight of melamine resin as solid content, and carbitol acetate as solvent. 70 parts by weight were mixed.

  In the third color, 0.63 parts by weight of Pigment Yellow 150 as a pigment, 0.08 parts by weight of Pigment Red 254, 0.46 parts by weight of a dispersant, and 70 parts by weight of carbitol acetate as a solvent were mixed.

  The ink of each color is filled in the ink jet head, the distance between the image receiving layer and the head is set to 1 mm, and predetermined ink is applied to each sub-pixel within 10 μm accuracy. It was a part.

  In the reflective display device thus manufactured, the saturation C is 45.4 for the first color development, 48.6 for the second color development, and the color difference ΔEab between the first color development and the second color development is 19. It became four. Both resolution and brightness were good.

(Example 2)
There were three sub-pixels, and each usage range was 33%. The hue angles were adjusted so that the first color was 45 °, the second color was 340 °, and the third color was 15 °. The hue angle difference between the first color and the second color is 295 ° when rotated counterclockwise from the first color point to the second color point on the L ^* a ^* b color system. However, when it is rotated clockwise, it becomes 65 °. In this case, the hue angle is 65 °.

  The first color was the same as the first color of Example 1.

  The second color is 0.54 parts by weight of Pigment Red 122 as a pigment, 0.08 parts by weight of Pigment Red 254, 0.33 parts by weight of a dispersant, 29.04 parts by weight of melamine resin as a solid content, and carbitol acetate as a solvent. 70 parts by weight were mixed.

  The third color is 0.23 parts by weight of Pigment Red 122 as a pigment, 0.54 parts by weight of Pigment Red 254, 0.40 parts by weight of a dispersant, 28.82 parts by weight of melamine resin as a solid content, and carbitol acetate as a solvent. 70 parts by weight were mixed.

  In the reflection type display device manufactured using the inks of the respective colors, the saturation C is 44.8 for the first color development, 39.0 for the second color development, and the color difference ΔEab between the first color development and the second color development is It was 16.0. Both resolution and brightness were good.

(Example 3)
There were three sub-pixels, and each usage range was 33%. The hue angles were adjusted so that the first color was 5 °, the second color was 125 °, and the third color was 60 °.

  The first color is 0.39 parts by weight of Pigment Red 122 as a pigment, 0.40 parts by weight of Pigment Red 254, 0.41 parts by weight of a dispersant, 28.79 parts by weight of melamine resin as a solid content, and carbitol acetate as a solvent. 70 parts by weight were mixed.

  The second color was the same as the second color of Example 1.

  The third color is 0.51 part by weight of Pigment Red 122, 0.30 part by weight of Pigment Red 254 as a pigment, 0.48 part by weight of a dispersant, 28.71 parts by weight of melamine resin as a solid content, and carbitol acetate as a solvent. 70 parts by weight were mixed.

  In the reflection type display device manufactured using the inks of the respective colors, the saturation C is 36.8 for the first color development, 34.1 for the second color development, and the color difference ΔEab between the first color development and the second color development is It was 31.0. Both resolution and brightness were good.

Example 4
Nine sub-pixels were used, and each usage range was 33%. The hue angles were adjusted so that the first color was 45 °, the second color was 340 °, and the third color was 15 °.

  The first color, the second color, and the third color were the same as those in Example 2.

  In the reflective display device manufactured using the inks of the above colors, the saturation C is 45.5 for the first color development, 39.0 for the second color development, and the color difference ΔEab between the first color development and the second color development is It was 16.7. Both resolution and brightness were good.

(Example 5)
There are 9 sub-pixels, and each usage range is 22% for the first color, 22% for the second color, 11% for the third color, 11% for the fourth color, and 33% for the non-colored area. It was. The hue angles were adjusted so that the first color was 5 °, the second color was 125 °, the third color was 70 °, and the fourth color was 45 °.

  The first color was the same as the first color of Example 3.

  The second color was the same as the second color of Example 3.

  The third color is 0.50 part by weight of Pigment Yellow 150 as a pigment, 0.19 part by weight of Pigment Red 254, 0.43 part by weight of a dispersant, 28.86 parts by weight of melamine resin as a solid content, and carbitol acetate as a solvent. 70 parts by weight were mixed.

  In the reflection type display device manufactured using the inks of the respective colors, the saturation C is 32.5 for the first color development, 31.0 for the second color development, and the color difference ΔEab between the first color and the second color is It became 32.4. Both resolution and brightness were good.

(Example 6)
There are 25 sub-pixels, and each usage range is 20% for the first color, 20% for the second color, 20% for the third color, 20% for the fourth color, and 20% for the non-colored area. It was. The hue angles were adjusted so that the first color was 5 °, the second color was 125 °, the third color was 30 °, and the fourth color was 40 °.

  The first color was the same as the first color of Example 3.

  The second color was the same as the second color of Example 3.

  In the third color, 0.86 parts by weight of PigmentRed254 as a pigment, 0.46 parts by weight of a dispersant, 28.73 parts by weight of melamine resin as a solid content, and 70 parts by weight of carbitol acetate as a solvent were mixed.

  In the reflection type display device manufactured using the inks of the respective colors, the saturation C is 33.6 for the first color development, 31.5 for the second color development, and the color difference ΔEab between the first color and the second color is It became 33.1. Both resolution and brightness were good.

(Example 7)
The number of sub-pixels was 25, and each usage range was 20% for the first color, 20% for the second color, 20% for the third color, and 40% for the non-colored area. The hue angles were adjusted so that the first color was 5 °, the second color was 125 °, and the third color was 70 °.

  The first color was the same as the first color of Example 3.

  The second color was the same as the second color of Example 3.

  The third color was the same as the third color of Example 5.

  In the reflection type display device manufactured using the inks of the respective colors, the saturation C is 30.0 for the first color development, 30.2 for the second color development, and the color difference ΔEab between the first color development and the second color development is It was 28.4. Both resolution and brightness were good.

(Example 8)
The number of sub-pixels was 25, and each usage range was 40% for the first color, 40% for the second color, and 20% for the third color. The hue angles were adjusted so that the first color was 5 °, the second color was 125 °, and the third color was 70 °.

  The first color was the same as the first color of Example 3.

  The second color was the same as the second color of Example 3.

  The third color was the same as the third color of Example 5.

  The reflection type display device manufactured using the inks of the respective colors has a saturation C of 35.9 for the first color development, 33.9 for the second color development, and a color difference ΔEab between the first color development and the second color development. It became 35.2. Both resolution and brightness were good.

(Comparative Example 1)
The number of sub-pixels is three, and each usage range is 50% for the first color and 50% for the second color. The hue angle was adjusted so that the first color was 45 ° and the second color was 125 °.

  The first color was the same as the first color of Example 1.

  The second color was the same as the second color of Example 1.

  In the reflection type display device manufactured using the inks of the respective colors, the saturation C is 26.0 for the first color development, 39.2 for the second color development, and the color difference ΔEab between the first color development and the second color development is It became 27.7. Although the resolution was good, the brightness when the panel was colored was not sufficient. Since the saturation was less than 30 in the first color development and the brightness was not sufficient, the determination was x.

(Comparative Example 2)
There are three sub-pixels, and each usage range is 33% for the first color, 33% for the second color, and 33% for the third color. The hue angles were adjusted so that the first color was 5 °, the second color was 135 °, and the third color was 70 °.

  The first color was the same as the first color of Example 3.

  The second color is 0.51 part by weight of Pigment Yellow 150 as a pigment, 0.60 part by weight of Pigment Red 254, 0.82 part by weight of a dispersant, 28.07 parts by weight of melamine resin as a solid, and carbitol acetate as a solvent. 70 parts by weight.

  The third color was the same as the third color of Example 5.

  In the reflection type display device manufactured using the inks of the respective colors, the saturation C is 33.3 for the first color development, 29.0 for the second color development, and the color difference ΔEab between the first color development and the second color development is It became 32.3. Both resolution and brightness were good. Since the saturation was less than 30 in the second color development, the determination was x.

(Comparative Example 3)
There are three sub-pixels, and each usage range is 33% for the first color, 33% for the second color, and 33% for the third color. The hue angles were adjusted so that the first color was 45 °, the second color was 345 °, and the third color was 15 °.

  The first color was the same as the first color of Example 1.

  The second color is 0.75 parts by weight of Pigment Red 122, 0.14 parts by weight of Pigment Red 254 as a pigment, 0.47 parts by weight of a dispersant, 28.63 parts by weight of melamine resin as a solid content, and carbitol acetate as a solvent. 70 parts by weight.

  The third color was the same as the third color of Example 2.

  In the reflection type display device manufactured using the inks of the respective colors, the saturation C is 39.3 for the first color development, 45.5 for the second color development, and the color difference ΔEab between the first color development and the second color development is It was 14.0. Both resolution and brightness were good. Since the color difference ΔEab between the first color development and the second color development was smaller than 15, the determination was made x.

(Comparative Example 4)
The number of sub-pixels is 25, and each usage range is 16% for the first color, 16% for the second color, and 68% for the third color. The hue angles were adjusted so that the first color was 5 °, the second color was 125 °, and the third color was 60 °.

  The first color was the same as the first color of Example 3.

  The second color was the same as the second color of Example 3.

  The third color was the same as the third color of Example 3.

  The reflection type display device manufactured using the inks of the above colors has a saturation C of 23.3 for the first color development, 22.4 for the second color development, and a color difference ΔEab between the first color development and the second color development. It became 27.0. Both resolution and brightness were good. Since the saturation of the first color development and the second color development was less than 30, the determination was x.

(Comparative Example 5)
The number of sub-pixels was 25, and each usage range was 20% for the first color, 20% for the second color, 8% for the third color, and 52% for the non-colored area. The hue angles were adjusted so that the first color was 5 °, the second color was 125 °, and the third color was 60 °.

  The first color was the same as the first color of Example 3.

  The second color was the same as the second color of Example 3.

  The third color was the same as the third color of Example 3.

  In the reflection type display device manufactured using the inks of the respective colors, the saturation C is 22.4 for the first color development, 21.2 for the second color development, and the color difference ΔEab between the first color development and the second color development is It became 25.0. Both resolution and brightness were good. Since the saturation of the first color development and the second color development was less than 30, the determination was x.

(Comparative Example 6)
The number of sub-pixels was 36, and each usage range was 33% for the first color, 33% for the second color, and 33% for the third color. The hue angles were adjusted so that the first color was 45 °, the second color was 125 °, and the third color was 90 °.

  The first color was the same as the first color of Example 1.

  The second color was the same as the second color of Example 1.

  The third color was the same as the third color of Example 1.

  The reflection type display device manufactured using the inks of the respective colors has a saturation C of 46.1 for the first color development, 49.4 for the second color development, and a color difference ΔEab between the first color development and the second color development. It became 20.7. Although the brightness was good, the resolution was bad, so the judgment was x.

  The present invention can be used in a reflective display device including a color filter.

DESCRIPTION OF SYMBOLS 1 Display apparatus board | substrate 2 Pixel electrode 3 Adhesive layer 4 Reflective display layer 5 Transparent electrode layer 6 Film layer with a transparent electrode 7 Color filter layer (colored pixel of 1st color)
8 Color filter layer (colored pixels of the second color)
9 Color filter layer (colored pixels of the third color)
DESCRIPTION OF SYMBOLS 10 Image receiving layer 11 Adhesive layer 12 Protective film 21 1st color 22 Hue angle of 1st color 23 Range of hue angle of 2nd color (a)
24 Range of hue angle of second color (b)
25 Range of hue angle of third color (a)
26 Range of hue angle of third color (b)
27 Color filter layer (fourth color pixel)
28 Non-colored pixels

Claims (5)

A reflective display layer having a plurality of pixel electrodes and displaying white and black;
A color filter of at least three colors having a pattern composed of a plurality of pixels corresponding to the pattern of the pixel electrode;
The color filter includes a second color whose hue angle difference between a predetermined first color and the first color is 65 degrees or more and 120 degrees or less, or −120 degrees or more and −65 degrees or less; A reflective display device comprising a hue angle of a first color and a third and subsequent colors having a hue angle between the hue angle of the second color. The color filter has only three colors,
A reflection type wherein a hue angle of the third color is -15 degrees or more and 15 degrees or less from a hue angle intermediate between the hue angle of the first color and the hue angle of the second color Display device.   The reflective display device according to claim 1, wherein the pixel includes 3 or more and 25 or less subpixels.   The ratio of the area of the colored portion in the pixels of the first color and the second color is 20% or more and 40% or less, respectively. A reflective display device according to 1.   The reflective display device according to claim 1, wherein a ratio of an area of the non-colored portion in the pixel is 40% or less.