JP2008165050A - Method of manufacturing color filter and color filter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of manufacturing a color filter by which the color filter having excellent color reproducibility is manufactured in an easy and simple manner. <P>SOLUTION: The method of manufacturing the color filter provided with a pixel part of four or more colors including at least red, green and blue has a color layer forming step for forming a color layer by applying a color layer forming coating liquid by an inkjet process onto an opening part of a light shielding part of a base material having the light shielding part formed on the surface. The color layer forming step is forming all color layers using the smaller number of the color layer forming coating liquids than the number of colors in the pixel part, and has a color mixture colored layer forming step for forming the pixel part comprising color mixture colored layer by applying the color layer forming coating liquids of two or more colors onto the opening part of the light shielding part by the inkjet process in at least one pixel part. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a color filter manufacturing method and a color filter that are used in various liquid crystal display devices and the like and have excellent color reproducibility.

  In recent years, with the development of personal computers, particularly portable personal computers, the demand for liquid crystal display devices, particularly color liquid crystal display devices, has been increasing. This color liquid crystal display device is usually provided with a color filter having a colored layer of three primary colors of red (R), green (G), and blue (B) and a black matrix separating the primary color layers. The liquid crystal operates as a shutter by turning on and off the electrodes corresponding to the R, G, and B pixels of the filter, and light is transmitted through the R, G, and B pixels to perform color display. Is called.

  In recent years, there has been a demand for an expansion of the color reproduction region for such a color filter. A color filter having a pixel portion composed of the three primary color layers of R, G, and B as described above is used in a color liquid crystal display device. When used, colors that can be expressed are limited to, for example, colors within the area defined by the RGB color triangles on the xy chromaticity diagram, so there is a limit to the expansion of the color reproduction area. It has been difficult to improve color reproducibility.

  As a method for improving the color reproducibility of the color filter, for example, Patent Document 1 discloses a method of forming a colored layer of six primary colors. However, in such a method of forming a colored layer of six primary colors, for example, when forming a colored layer using a photolithography method, the coating liquid application, exposure, and development cycles are repeated a total of six times. There is a problem that the process becomes complicated.

JP 2005-62833 A

  From the above, it is desired to provide a method for producing a color filter that can easily produce a color filter with good color reproducibility.

  The present invention has a colored layer forming step of forming a colored layer by applying a colored layer forming coating liquid to the opening of the light shielding portion of the base material having a light shielding portion formed on the surface by an inkjet method, A method for producing a color filter having a pixel portion of four or more colors including at least green and blue, wherein the colored layer forming step includes a number of the colored layer forming coating liquids smaller than the number of colors of the pixel portion. And forming a colored layer forming coating solution of two or more colors in at least one of the pixel portions by applying an ink jet method to the openings of the same light shielding portion. There is provided a method for producing a color filter, characterized by comprising a mixed color layer forming step of forming a pixel portion comprising a mixed color layer.

According to the present invention, a pixel portion composed of a mixed color layer is formed by using a coating solution for forming a colored layer of two or more colors, thereby forming a pixel portion of four or more colors. And a color filter with good color reproducibility can be obtained.
Further, according to the present invention, the mixed color layer is formed by applying a coating solution for forming a colored layer of two or more colors to the opening of the same light-shielding part by an ink jet method. By changing the discharge amount of the forming coating liquid, it becomes possible to form a pixel portion composed of a mixed colored layer having a desired chromaticity, and therefore it is possible to manufacture a color filter having excellent color reproducibility. it can.
Furthermore, according to the present invention, since each colored layer is formed by an ink jet method, the number of steps can be reduced as compared with the photolithography method, so that a color filter can be easily manufactured. . In addition, since the entire colored layer is formed using a smaller number of colored layer forming coating solutions than the number of colors of the pixel portion, it is possible to form a large number of pixel portions with a small number of steps. Thus, a color filter manufacturing method having excellent manufacturing efficiency can be obtained.

  In the above invention, the mixed color layer forming step is to apply the first color layer forming coating solution to the opening of the light shielding portion and cure to form the first color layer, It is preferable to apply the second color layer-forming coating solution on the first color layer. By curing the first color layer forming coating solution and then applying the second color layer forming coating solution, the mixed color layer can be composed of two layers. It is possible to form a mixed color layer with little unevenness and uniform color mixing.

  Moreover, in the said invention, it is preferable that at least 1 of the colored layer forming coating liquid which forms the said mixed color layer is the colored layer forming coating liquid selected from red, green, and blue. This is because it is easy to form pixel portions of the three primary colors red, green, and blue.

  Furthermore, in the said invention, the combination of the coating liquid for colored layer formation which forms the said color mixture colored layer is a combination of the coating liquid for blue colored layer formation and the coating liquid for green colored layer formation, blue colored layer formation A combination of a coating liquid for forming a yellow colored layer and a coating liquid for forming a yellow colored layer, and a combination of a coating liquid for forming a green colored layer and a coating liquid for forming a yellow colored layer preferable. This is because, when the mixed color layer is formed with a combination of colors as described above, a color reproduction region is widened, and a color filter having excellent color reproducibility can be obtained.

  The present invention also includes a base material, a light-shielding portion formed in a pattern on the base material, and four or more colors including at least red, green, and blue formed by an inkjet method in the opening of the light-shielding portion. A color filter having a pixel part, wherein the pixel part of at least one color is composed of a laminated colored layer formed by laminating two or more colored layers, and the colored layer of at least one color of the laminated colored layer comprises: Provided is a color filter having the same color as a colored layer constituting the pixel portion of another color.

According to the present invention, since the laminated colored layer is composed of a laminated layer of two or more colored layers, a color filter having a pixel portion of four or more colors can be obtained. Therefore, a color filter having excellent color reproducibility can be obtained.
In addition, according to the present invention, since the pixel portion of at least one color is composed of the laminated colored layer, a color filter having a pixel portion with little color unevenness can be obtained.
Furthermore, according to the present invention, since the pixel portion of four or more colors is formed by an ink jet method, the number of manufacturing steps is small compared to the photolithography method, and thus a color filter manufactured easily It becomes possible to do. In addition, since the colored layer of at least one color of the laminated colored layer is the same color as the colored layer constituting the pixel portion of the other color, it is possible to reduce the number of manufacturing steps, so that the efficiently manufactured color It can be a filter.

  In the said invention, it is preferable that the colored layer of at least 1 color of the said laminated colored layer is red, green, or blue. This is because it is possible to easily form the pixel portions of the three primary colors red, green, and blue.

  Moreover, in the said invention, the combination of the said laminated colored layer is selected from the combination of a blue colored layer and a green colored layer, the combination of a blue colored layer and a yellow colored layer, and the combination of a green colored layer and a yellow colored layer It is preferable that it is at least one combination. This is because, when the laminated colored layer is composed of the above-described combinations of colors, a color reproduction region is widened and a color filter having excellent color reproducibility can be obtained.

  According to the present invention, it is possible to easily manufacture a color filter with good color reproducibility.

  The present invention relates to a method for producing a color filter used in various liquid crystal display devices and the like, and a color filter. Each will be described below.

A. First, a method for producing a color filter of the present invention will be described. The color filter manufacturing method of the present invention is a method for forming a colored layer by applying a coating solution for forming a colored layer to the opening of the light-shielding portion of the substrate having a light-shielding portion formed on the surface by an inkjet method. A method of manufacturing a color filter having a pixel portion of four or more colors including at least red, green, and blue having a step, wherein the colored layer forming step includes a number of the colored layers smaller than the number of colors of the pixel portion Forming the entire colored layer using the forming coating liquid, and at least one of the pixel portions, the two or more colored layer forming coating liquids are opened in the same light-shielding portion by an inkjet method. It is a method characterized by having a mixed color layer forming step of forming a pixel portion composed of a mixed color layer by applying to a portion.

  For example, as shown in FIG. 1, the color filter manufacturing method of the present invention applies a blue colored layer forming coating solution 10 a to the openings X and Y of the light shielding part 2 formed in a pattern on the substrate 1. Is applied by an ink jet method (FIG. 1A), and a coating solution 10b for forming a green color layer is applied to the openings X and Z of the light shielding portion 2 by an ink jet method (FIG. 1B). By curing, a pixel portion (cyan pixel portion C) composed of the mixed color layer 3 in which the blue colored layer 4B and the green colored layer 4G are laminated in the opening X is formed (FIG. 1C). It is a method which has a layer formation process. At this time, as illustrated in FIG. 1C, simultaneously with the formation of the cyan pixel portion C formed of the mixed color layer 3, the blue pixel portion B formed of the blue colored layer 4B and the opening Z are formed in the opening Y. A green pixel portion G made of the green colored layer 4G is formed, and a red pixel portion R made of the red colored layer 4R is separately formed using a red colored layer forming coating solution.

  In the case of a conventional color filter having a pixel portion of three primary colors of R, G, and B, as described above, only colors within an area defined by RGB color triangles on the xy chromaticity diagram can be represented. Therefore, there is a problem that it is difficult to improve color reproducibility.

  On the other hand, in the present invention, a pixel portion composed of a mixed color layer is formed using a coating solution for forming a colored layer of two or more colors to form a pixel portion of four or more colors. Compared with a color filter having a pixel portion, the color reproduction region can be expanded. For example, as shown in FIG. 1C, the four color pixel portions in the color filter are obtained from a red pixel portion R formed of a red colored layer 4R, a green pixel portion G formed of a green colored layer 4G, and a blue colored layer 4B. In the case of the blue pixel portion B and the cyan pixel portion C including the color mixture layer 3 in which the blue color layer 4B and the green color layer 4G are mixed, for example, in the xy chromaticity diagram shown in FIG. This is because the color coordinate C of the color indicated by the cyan pixel portion composed of layers can be outside the region of the color triangles of R (red), G (green), and B (blue). That is, when the two color layer forming coating liquids are mixed, the color coordinates of the color indicated by the mixed color layer are always located outside the straight line connecting the color coordinates of the mixed colors. Become. For this reason, since the area of the figure formed by connecting all the color coordinates with a straight line is enlarged, the color reproduction area is expanded. Therefore, according to the present invention, a color filter with good color reproducibility can be obtained.

  In the present invention, the mixed color layer is formed by applying a coating solution for forming a colored layer of two or more colors to the opening of the same light shielding portion by an ink jet method. Therefore, by changing the discharge amount of each colored layer forming coating liquid to be applied, the mixing ratio of the two or more colored layer forming coating liquids can be easily adjusted. Thus, it becomes possible to easily control the chromaticity of the pixel portion. Therefore, a color filter having excellent color reproducibility can be manufactured.

  Furthermore, according to the present invention, since the colored layer constituting the pixel portion of four or more colors is formed by the ink jet method, the number of steps can be reduced as compared with the photolithography method in which coating, exposure and development are repeated. Therefore, it is possible to easily manufacture a color filter. In addition, since all the colored layers formed in the present invention are formed using a smaller number of colored layer forming coating liquids than the number of colors of the pixel portion, a large number of pixel portions can be formed with a small number of steps. Since it becomes possible to form, it can be set as the manufacturing method of the color filter excellent in manufacturing efficiency.

The pixel portion in the color filter manufactured according to the present invention is not particularly limited as long as it is composed of pixel portions of four or more colors including at least red, green, and blue, but manufacturing efficiency and practicality are not limited. From the surface, it is usually about 4 to 6 colors, and preferably about 4 to 5 colors.
Hereinafter, the manufacturing method of the color filter of this invention is demonstrated in detail for every process.

1. Colored layer forming step First, the colored layer forming step in the present invention will be described. The colored layer forming step in the present invention is a step of forming a colored layer by applying a coating solution for forming a colored layer to the opening of the light-shielding portion of the substrate having a light-shielding portion formed on the surface by an inkjet method. A step of forming all the colored layers using the number of the colored layer forming coating liquids smaller than the number of colors of the pixel portion, and forming at least one of the colored portions in at least one of the pixel portions. A color mixture colored layer forming step of forming a pixel portion composed of a color mixture color layer by applying the coating liquid to the opening of the same light shielding part by the inkjet method.

  In the colored layer forming step, the entire colored layer is formed using the number of colored layer forming coating liquids smaller than the number of colors of the pixel portion. In the present invention, the colored layer forming coating liquid used for forming the mixed color layer in the mixed color layer forming step to be described later is also used for forming the colored layer constituting the pixel portion of the other color. The number of colors of the colored layer forming coating liquid to be reduced can be made smaller than the number of colors of the pixel portion. At this time, the number of colors of the color layer forming coating solution used in combination with the color layers constituting the mixed color layer and the other color pixel portion is the color layer forming coating solution necessary for forming all the color layers. Is not particularly limited as long as the number of colors is less than the number of colors of the pixel portion, and may be all colors among the colored layer forming coating liquid used for forming the mixed color layer, Some of these colors may be used. The colored layer constituting the other color pixel portion may be a colored layer constituting another mixed color layer, or a colored layer (described later) formed with a coating solution for forming a colored layer of one color. Non-mixed colored layer).

In addition, such a colored layer forming step is usually a process for forming a pixel portion from one color layer forming coating solution without mixing the above-mentioned mixed color layer forming step and the colored layer forming coating solution. It is divided into two steps, that is, a mixed color layer forming step.
Hereinafter, each process will be described.

a. First, the mixed color layer forming step in the present invention will be described. The mixed color layer forming step in the present invention comprises a mixed color layer by applying a color layer forming coating liquid of two or more colors to the opening of the same light shielding part by an inkjet method in at least one of the pixel parts. This is a step of forming a pixel portion.

  The colored layer forming coating solution used for forming the mixed color layer is not particularly limited as long as it is a colored layer forming coating solution of two or more colors. Three colors are preferable, and two colors are particularly preferable. This is because if the number of mixed colors is too large, the process may become complicated.

  In the present invention, as the method for forming the above-mentioned mixed color layer, the mixed color layer is formed by applying a coating solution for forming two or more colors to the opening of the same light-shielding part by an ink jet method. For example, when a mixed color layer is formed using a two-color colored layer forming coating solution, the first colored layer forming coating solution is used as a light shielding portion. The first color layer forming coating solution is applied after the first color layer coating solution is cured, and the first color layer forming coating solution and the second color are applied. The colored layer forming coating liquid may be mixed on the opening of the light shielding part, or the first colored layer forming coating liquid may be applied to the opening of the light shielding part and cured. Thereafter, a method of applying a second color layer forming coating solution thereon may be used. In the present invention, it is preferable to cure the latter first color layer forming coating solution and then apply the first color layer forming coating solution. In the case of this method, for example, as shown in FIG. 1 (c), the mixed color layer 3 can be composed of a laminate of two colored layers of a blue color layer 4B and a green color layer 4G. This is because a mixed color layer having little color unevenness and uniform color mixing can be formed.

  In the method of applying the second color layer forming coating solution after the first color layer forming coating solution is cured, the second color layer forming coating solution is the first color in the present invention. It is preferable to cure the first color layer forming coating solution to such an extent that it is not mixed with the colored layer forming coating solution. Specifically, after removing the solvent of the first color layer forming coating solution or when the resin used in the colored layer forming coating solution is a curable resin such as a thermosetting resin, heat treatment It is preferable to apply the second color layer forming coating solution after performing a curing treatment such as the above. The curing treatment is appropriately selected according to the cured resin to be used, and can be the same as the method used when the colored layer is generally formed by an inkjet method, such as heat treatment or UV treatment.

  In the present invention, as described above, the colored layer forming step is a step of forming the entire colored layer using a colored layer forming coating liquid having a smaller number of colors than the number of colors of the pixel portion in the color filter. For this reason, the coating liquid for forming two or more colored layers used for forming the mixed color layer is also used for forming a colored layer constituting a pixel portion of another color. As an example in which the coating liquid for forming two or more colored layers used for forming such a mixed color layer is used for forming a colored layer constituting a pixel portion of another color, as shown in FIG. An example of forming a color filter having four color pixel portions from three color layer forming coating liquids of red, green and blue can be given. Specifically, a blue colored layer forming coating solution 10a for the first color is applied to the openings X and Y of the light shielding part 2 formed in a pattern on the substrate 1 by an ink jet method (FIG. 1A )) Subsequently, the second color green colored layer forming coating solution 10b is applied to the openings X and Z of the light shielding part 2 by the ink jet method (FIG. 1B), and the blue colored layer 4B and the green color are coated. A cyan pixel portion C composed of the mixed color layer 3, a blue pixel portion B composed of the blue color layer 4B, and a green pixel portion G composed of the green color layer 4G, which are laminated with the layer 4G, are formed (FIG. 1C). ). Thereafter, the red pixel portion R composed of the red colored layer 4R is formed using the remaining one color of the red colored layer forming coating liquid (FIG. 1C).

  As described above, the coating liquid for forming two or more colored layers used for forming the mixed color layer is also used for forming a colored layer constituting a pixel portion of another color. In the case of the manufacturing method to be used, the number of colors of the colored layer forming coating liquid to be used can be three, and the number of colors of the colored layer forming coating liquid required for forming all the colored layers is smaller. can do.

  In addition, when the coating solution for forming two or more colored layers used for forming the mixed color layer is also used for forming a colored layer constituting a pixel portion of another color, the colored layer forming coating used in combination is used. The working fluid may be applied at the same time, or may be applied separately, but in the present invention, it is preferable to apply at the same time in terms of production efficiency.

  In the present invention, the mixed color layer formed by the mixed color layer forming step may be one that forms one or more pixel portions of four or more color pixel portions, for example, one color. Alternatively, two colors or all colors may be used. In particular, in the present invention, it is preferable that the pixel portion of about one or two colors is composed of a mixed color layer. It is because it is not preferable on manufacturing efficiency when there are too many mixed color layers.

  The color combination of the two or more color layer-forming coating liquids used for forming the mixed color layer is appropriately selected so that the color obtained by the mixed color becomes a desired color. As the color of each colored layer forming coating solution used in such a combination, it can be the same color as the coating solution used for forming a colored layer of a general color filter, for example, red, blue, Examples include green, yellow, cyan, and magenta.

  In the present invention, it is preferable that at least one color is selected from red, blue and green among the two or more colored layer forming coating liquids used for forming the mixed color layer. This is because the formation of the pixel portions of the three primary colors red, blue, and green can be facilitated.

  Further, examples of the color combination of the color layer-forming coating liquid used for forming the mixed color layer include a combination of blue and green, a combination of blue and yellow, and a combination of green and yellow. be able to. This is because by combining such colors, the color reproduction region can be further expanded and the color reproducibility can be improved. Note that cyan can be expressed by combining blue and green, green can be expressed by combining blue and yellow, and yellow-green can be expressed by combining green and yellow.

  Further, the ratio of the colors to be combined is determined by appropriately adjusting so as to obtain a desired color. Such adjustment of the color ratio can be easily performed by adjusting the discharge amount of the colored layer forming coating liquid of each color.

  The colored layer forming coating liquid used in the present invention can be the same as that generally used when forming the colored layer of the color filter by the ink jet method, for example, a thermosetting resin or A curable resin such as a UV curable resin, a dye or pigment, various additives, and the like can be used. About each of these materials, it can be made to be the same as that used for the coating liquid for coloring layer formation for general inkjet.

  The film thickness of the mixed color layer formed according to the present invention is appropriately selected according to the film thickness of the entire color layer to be formed, the pattern and type of the color layer, and the like.

  In addition, as the light-shielding portion used in the present invention, a color filter having a liquid repellency is usually used to prevent color mixing between adjacent colored layers, and a colored layer is generally formed by an inkjet method. It can be the same as the light-shielding portion used in the above.

  Further, the substrate used in the present invention is not particularly limited as long as it can form the above-described mixed color layer or the non-colored color layer described later, and is used when producing a general color filter. It can be the same as the base material to be formed.

b. Next, the non-mixed color layer forming step in the present invention will be described. The non-mixed color layer forming step in the present invention is formed with a single color layer forming coating solution without mixing two or more colored layer forming coating solutions as in the above-described mixed color layer. This is a step of forming a pixel portion made of a colored layer.

  The color of the pixel portion formed by the non-mixed color layer forming step is determined according to the color of the pixel portion formed of the mixed color layer formed by the mixed color layer forming step.

  For example, as described above, when the mixed color layer is formed of a combination of blue and green, the pixel portion formed of the mixed color layer indicates cyan. Therefore, as illustrated in FIG. As the pixel portion made of a colored layer, a red pixel portion R made of a red colored layer 4R, a green pixel portion G made of a green colored layer 4G, and a blue pixel portion B made of a blue colored layer 4B are formed. In addition, as illustrated in FIG. 3, as a pixel portion including an unmixed color layer other than the cyan pixel portion C, a red pixel portion R including a red color layer 4R, a green pixel portion G including a green color layer 4G, and a blue color A blue pixel portion B composed of the layer 4B and a yellow pixel portion Y composed of the yellow colored layer 4Y are formed.

  In addition, for example, as described above, when the mixed color layer is formed of a combination of blue and yellow, the pixel portion formed of the mixed color layer indicates green. Therefore, as illustrated in FIG. As the pixel portion of the mixed color layer, a red pixel portion R composed of the red color layer 4R, a yellow pixel portion Y composed of the yellow color layer 4Y, and a blue pixel portion B composed of the blue color layer 4B are formed.

  Further, for example, as described above, when the mixed color layer is formed of a combination of blue and green, and a combination of yellow and green, the pixel portion formed of the mixed color layer shows cyan and yellow green, respectively. As illustrated in FIG. 4, as the pixel portion including the non-mixed color layer other than the cyan pixel portion C and the yellow-green pixel portion GY, the red pixel portion R including the red color layer 4R and the blue pixel portion B including the blue color layer 4B. And the yellow pixel part Y consisting of the yellow colored layer 4Y is formed.

  Further, the non-color-mixed colored layer forming step may be performed before the color-mixed colored layer step or may be performed after the color-mixed colored layer forming step, but is performed simultaneously with the color-mixed colored layer step. It is preferable. Here, the case where the non-color-mixed colored layer forming step and the color-mixed colored layer forming step are performed at the same time is for forming the color-mixed colored layer used for forming the color-mixed colored layer as described above When the coating liquid is also used for forming a non-color-mixed colored layer, or using an inkjet device that can simultaneously discharge a plurality of colored layer-forming coating liquids, The case where the coating solution for forming a colored layer used in the above is applied at the same time.

  In addition, about the material of the coating liquid for colored layer formation used in the said non-mixed color layer formation process, since it can be the same as that described in the above-mentioned mixed color layer formation process, explanation here Omitted. Further, the film thickness of the non-color-mixed colored layer is determined by appropriately adjusting so as to obtain a desired color, and as a result, the film thickness may be the same as that of the color-mixed colored layer, or a different film It may be thick. Such adjustment of the film thickness can be easily performed by adjusting the discharge amount of the coating liquid for forming the colored layer in the inkjet method.

2. Other Steps In the method for producing the color filter of the present invention, necessary steps other than the colored layer forming step described above may be included. For example, necessary steps such as a light shielding part forming step for forming a light shielding part between the colored layers and a transparent electrode layer forming step for forming a transparent electrode layer on the colored layer may be included. The light shielding part forming step, the transparent electrode layer forming step, and the like can be the same as the respective steps in a general color filter manufacturing method, and thus detailed description thereof is omitted here.

B. Next, the color filter of the present invention will be described. The color filter of the present invention includes a base material, a light shielding part formed in a pattern on the base material, and four or more colors including at least red, green, and blue formed by an ink jet method in the opening of the light shielding part A color filter having at least one color, wherein the pixel portion of at least one color is composed of a laminated colored layer formed by laminating colored layers of two or more colors, and at least one colored layer of the laminated colored layer comprises The color layer is the same color as the colored layer constituting the pixel portion of another color.

  For example, as shown in FIG. 2, the color filter of the present invention has two colors: a base material 1, a light shielding portion 2 formed in a pattern on the base material 1, a blue colored layer 4B, and a green colored layer 4G. A cyan pixel portion C composed of a laminated colored layer 5 formed by laminating colored layers, a red pixel portion R composed of a red colored layer 4R, a green pixel portion G composed of a green colored layer 4G, and a blue color composed of a blue colored layer 4B. The pixel part B is comprised.

  According to the present invention, it is possible to expand the color reproduction region by stacking two or more colored layers. This is because, when two or more colored layers are stacked and mixed, in the xy chromaticity diagram, the color coordinates of the color indicated by the pixel portion composed of the stacked colored layers always connect the color coordinates of the stacked colors. This is because it is located outside the straight line. Therefore, according to the present invention, since the color reproduction region is widened, a color filter having excellent color reproducibility can be obtained.

  Moreover, since the laminated colored layer in the color filter of the present invention is a color mixture obtained by laminating the colored layers, it can be a pixel portion composed of laminated colored layers with little color unevenness. Therefore, it is possible to obtain a color filter that hardly causes display unevenness.

Furthermore, according to the present invention, since the colored layer constituting the pixel portion of four or more colors is formed by the ink jet method, the number of manufacturing steps is small compared to the photolithography method, so that the manufacturing is simple. The color filter can be made. In addition, since the colored layer of at least one color of the laminated colored layer is the same color as the colored layer constituting the pixel portion of the other color, it is possible to reduce the number of manufacturing steps, so that the efficiently manufactured color It can be a filter.
Hereinafter, the color filter of the present invention will be described separately for each configuration. In addition, since it can be the same as that of what was demonstrated by the above-mentioned "A. manufacturing method of a color filter" about the base material, the light shielding part, etc. in this invention, description here is abbreviate | omitted.

1. Pixel Unit First, the pixel unit in the color filter of the present invention will be described. The pixel portion in the present invention is composed of pixel portions of four or more colors including at least red, green, and blue, and at least one color pixel portion is formed by laminating two or more color layers. It consists of Such a pixel portion is generally composed of a laminated colored layer formed by laminating two or more colored layers and a single-layer colored layer composed of one colored layer.

The pixel portion in the color filter of the present invention is not particularly limited as long as it is composed of pixel portions of four or more colors including at least red, green, and blue. From the surface, it is usually about 4 to 6 colors, and preferably about 4 to 5 colors.
Hereinafter, the laminated colored layer and the single-layer colored layer included in the pixel portion in the present invention will be described in detail.

a. Laminated colored layer First, the laminated colored layer in the present invention will be described. The laminated colored layer in the present invention is formed by laminating two or more colored layers, and at least one colored layer has the same color as the colored layer constituting the pixel portion of the other color. In addition, this laminated colored layer constitutes a pixel portion of at least one color among all the pixel portions of four or more colors formed in the color filter of the present invention.

  The colored layer constituting the laminated colored layer is not particularly limited as long as it is a colored layer of two or more colors, but in the present invention, it is preferably a colored layer of 2 to 3 colors, particularly A two-color colored layer is preferred. It is because a process may become complicated when there are too many laminations.

  In the present invention, among the two or more colored layers constituting the laminated colored layer, at least one colored layer is the same color as the colored layer constituting the pixel portion of the other color. It is preferable that more colors among the colored layers constituting the laminated colored layer have the same color as the other colored layers. Since the colored layer constituting the laminated colored layer is the same color as the other colored layers, the number of colors of the colored layer forming coating liquid used for forming all the colored layers can be reduced. It is because it can be set as the formed colored layer. In addition, since the colored layer formed using the same colored layer forming coating liquid can be applied at the same time when forming the colored layer, the number of steps can be reduced, and the colored layer formed efficiently. It is because it can be set as a layer. Here, the colored layer that constitutes the pixel portion of the other color may be a colored layer that constitutes another laminated colored layer, or may be a single-layer colored layer that includes one colored layer. As a color filter in which at least one color layer of the two or more color layers constituting such a laminated color layer has the same color as the color layer constituting the pixel portion of another color, for example, FIG. 5 can be mentioned.

  Further, in the present invention, the laminated colored layer may be one that forms one or more pixel portions out of four or more color pixel portions, for example, one color or two colors. It may be all colors. In particular, in the present invention, it is preferable that a pixel portion of about one color or two colors is composed of a laminated colored layer. It is because it is not preferable on manufacturing efficiency when there are too many laminated colored layers.

  A combination of colors of the colored layers constituting the laminated colored layer is appropriately selected so that a pixel portion composed of the laminated colored layers obtained by the combination has a desired color. The color of each of the laminated colored layers can be the same color as that of a general color filter, and examples thereof include red, blue, green, yellow, cyan, and magenta.

  In the present invention, it is preferable that at least one colored layer of the laminated colored layer is red, blue, or green. This is because the pixel portions of the three primary colors red, blue, and green can be easily formed.

  Examples of suitable color combinations of the colored layers constituting the laminated colored layer include a combination of blue and green, a combination of blue and yellow, and a combination of green and yellow. This is because, by using a pixel portion composed of a laminated colored layer obtained by combining such colors, the color reproduction range can be broadened and a color filter having excellent color reproducibility can be obtained. . Note that a pixel portion obtained by combining a blue colored layer and a green colored layer can express cyan, and a pixel portion obtained by combining a blue colored layer and a yellow colored layer can express green. The pixel portion obtained by combining the green colored layer and the yellow colored layer can express yellowish green.

  The film thickness of each of the two or more colored layers constituting the laminated colored layer is determined by appropriately adjusting the obtained pixel portion to have a desired color. Adjustment of the color of the pixel portion due to the difference in film thickness of the colored layer can be easily performed by adjusting the discharge amount of each colored layer forming coating liquid in the inkjet method when forming the laminated colored layer. it can.

  In addition, lamination | stacking of the colored layer of two or more colors as mentioned above can be confirmed by observing using a scanning electron microscope (SEM) etc.

  In addition, about the formation method of the lamination | stacking colored layer in this invention, it shall be the same as that of the method of forming the color mixture colored layer formed by laminating | stacking the coloring layer demonstrated by "A. manufacturing method of a color filter" mentioned above. Can do.

b. Single-layer colored layer Next, the single-layer colored layer in the present invention will be described. The single color layer in the present invention is a single color layer composed of a single color layer.

  The color of the pixel portion composed of such a single colored layer is determined according to the color of the pixel portion composed of the laminated colored layer.

  For example, as shown in FIG. 2, when a cyan pixel portion C is formed of a laminated colored layer 5 in which a blue colored layer 4B and a green colored layer 4G are laminated, a red pixel formed of a red colored layer 4R is used as a single-layer colored layer. A color filter having four color pixel portions of red, green, blue, and cyan is formed by forming a portion R, a green pixel portion G including a green coloring layer 4G, and a blue pixel portion B including a blue coloring layer 4B. it can.

  Further, for example, as shown in FIG. 3, when the cyan pixel portion C is composed of the laminated colored layer 5 in which the blue colored layer 4B and the green colored layer 4G are laminated, the single colored layer is composed of the red colored layer 4R. A red pixel portion R, a green pixel portion G consisting of a green coloring layer 4G, a blue pixel portion B consisting of a blue coloring layer 4B, and a yellow pixel portion Y consisting of a yellow coloring layer 4Y are formed, and red, green, blue, yellow and A color filter having pixel portions of five colors of cyan can be obtained.

  Further, for example, as shown in FIG. 4, when the green pixel portion G is composed of the laminated colored layer 5 in which the blue colored layer 4 </ b> B and the yellow colored layer 4 </ b> Y are laminated, the single colored layer is composed of the red colored layer 4 </ b> R. A red pixel portion R, a yellow pixel portion Y composed of a yellow colored layer 4Y, and a blue pixel portion B composed of a blue colored layer 4B are formed, and a color filter having four color pixel portions of red, green, blue and yellow is formed. be able to.

  Further, for example, as shown in FIG. 5, a cyan pixel portion C is formed of a laminated colored layer 5 in which a blue colored layer 4B and a green colored layer 4G are laminated, and further a yellow colored layer 4Y and a green colored layer 4G are laminated. When the yellow-green colored layer GY made of the laminated colored layer 5 is used, the red pixel portion R made of the red colored layer 4R, the blue pixel portion B made of the blue colored layer 4B, and the yellow colored layer 4Y as the single-layer colored layer. A yellow pixel portion Y consisting of the above can be formed, and a color filter having pixel portions of five colors of red, yellow-green, blue, yellow and cyan can be obtained.

  The method for forming such a single-colored layer can be the same as the method for forming a non-color-mixed colored layer described in the above-mentioned section “A. Method for producing a color filter”. Omitted.

2. Next, the color filter of the present invention will be described. The color filter of the present invention is not particularly limited as long as it has the pixel portion, the light shielding portion, and the base material as described above. For example, a transparent electrode layer, an alignment film, a protective layer, and the like are provided as necessary. You may have.

  The present invention is not limited to the above embodiment. The above-described embodiment is an exemplification, and the present invention has substantially the same configuration as the technical idea described in the claims of the present invention, and any device that exhibits the same function and effect is the present invention. It is included in the technical scope of the invention.

  The following examples illustrate the present invention more specifically.

[Example 1]
(Formation of liquid-repellent light-shielding part)
Isopropyl alcohol 3g, fluoroal 0E (trade name), N- [3- (trimethoxysilyl) propyl] -N-ethylperfluorooctanesulfonamide 50 mass% isopropyl ether solution 0.07g, titanium oxide sol (Ishihara Sangyo) STK-01 (trade name) 3 g, silica sol (manufactured by Nippon Synthetic Rubber Co., Ltd .; Glasca HPC7002 (trade name)) 0.6 g, and alkylalkoxysilane (manufactured by Nippon Synthetic Rubber Co., Ltd .; HPC 402H) (Product name) 0.2 g was mixed and stirred at 100 ° C. for 20 minutes. This solution was coated on a non-alkali glass substrate with a black matrix having a thickness of 0.7 mm by a spin coating method and heated at 150 ° C. for 20 minutes to obtain a photocatalyst-containing layer having a thickness of 0.15 μm.
The surface of the photocatalyst containing layer was irradiated with ultraviolet rays for 3 minutes at an illuminance of 70 mW / cm ² (356 nm) through an ultrahigh pressure mercury lamp through a photomask to change the wettability. As a result of measuring the contact angle of the unexposed part and the exposed part with water using a contact angle measuring device (CA-Z type manufactured by Kyowa Interface Science Co., Ltd.), the unexposed part is 70 degrees, and the exposed part (pixel part forming region) is It was 9 degrees.

(Colored layer formation process)
<Preparation of colored layer forming coating solution>
As the colored layer forming coating solution, UV curable polyfunctional acrylate monomer inks for each color of RGB including 5 parts by weight of pigment, 20 parts by weight of solvent, 5 parts by weight of polymerization initiator, and 70 parts by weight of UV curable resin were used. Here, for each of red, green, and blue inks, polyethylene glycol monomethyl ethyl acetate as a solvent, Irgacure 369 (trade name, manufactured by Ciba Specialty Chemicals Co., Ltd.) as a polymerization initiator, and UV curable resin DPHA (dipentaerythritol hexaacrylate (manufactured by Nippon Kayaku Co., Ltd.)) was used, and as pigments, CI Pigment Red 177 was used for red ink, and CI Pigment Green 36 + C was used for green ink. CI Pigment Yellow 150 and CI Pigment Blue 15 + CI Pigment Violet 23 were used for the blue ink, respectively.

<Formation of colored layer>
The red colored layer forming coating liquid (the red ink) was applied to a red pixel portion forming region using an inkjet device, and UV-treated and cured to form a red colored layer.
Next, the green color layer forming coating liquid (the green ink) is simultaneously applied to the green pixel portion forming region and the cyan pixel portion forming region using an ink jet apparatus, and this is subjected to UV treatment and cured. A green colored layer was formed. At this time, the discharge speed on the cyan pixel portion formation region was set to half the discharge speed on the green pixel portion formation region.
Further, the blue colored layer forming coating liquid (the blue ink) is simultaneously applied to the blue pixel portion forming region and the cyan pixel portion forming region using an ink jet apparatus, and is subjected to UV treatment to be cured. A blue colored layer was formed. At this time, the discharge speed on the cyan pixel portion formation region was set to half the discharge speed on the blue pixel portion formation region.
Thus, a red pixel portion made of a red colored layer, a green pixel portion made of a green colored layer, a blue pixel portion made of a blue colored layer, and a mixed colored layer (laminated colored layer) of the green colored layer and the blue colored layer. A cyan pixel portion was formed.

  A liquid crystal display device was manufactured using the color filter formed by the above steps, and the chromaticity of each pixel unit was measured alone. As a result, the xy chromaticity display was as shown in Table 1 below. . Further, the color reproducible range by the four-color pixel portion was about 93% in the NTSC ratio which is a color reproduction display standard.

[Comparative Example 1]
After forming the light-shielding portion in the same manner as in Example 1, using the coloring layer forming coating liquid used in Example 1, the red pixel portion, the green pixel portion, and the blue pixel portion are processed in the same procedure as in Example 1. Three color pixel portions were formed to obtain a color filter. When a liquid crystal display device was manufactured using this color filter, the chromaticity of the display color alone of each pixel unit was as shown in Table 1 below (the red pixel unit, the green pixel unit, the blue pixel of Example 1). Each of the three colors is equivalent). Further, the color reproducible range by these three color pixel portions is about 78% in NTSC ratio.

It is process drawing which shows an example of the manufacturing method of the color filter of this invention. It is a schematic sectional drawing which shows an example of the color filter manufactured by this invention. It is a schematic sectional drawing which shows the other example of the color filter manufactured by this invention. It is a schematic sectional drawing which shows the other example of the color filter manufactured by this invention. It is a schematic sectional drawing which shows the other example of the color filter manufactured by this invention. It is an xy chromaticity diagram for explaining a color filter manufactured according to the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Base material 2 ... Light-shielding part 3 ... Mixed colored layer 4R ... Red colored layer 4G ... Green colored layer 4B ... Blue colored layer 4Y ... Yellow colored layer 5 ... Laminated colored layer 10a ... Coating liquid for blue colored layer formation 10b ... Green colored layer forming coating solution R ... Red pixel portion G ... Green pixel portion B ... Blue pixel portion C ... Yellow pixel portion Y ... Yellow pixel portion GY ... Yellow green pixel portion

Claims (7)

Red, green, and blue having a colored layer forming step of forming a colored layer by applying a colored layer forming coating liquid to the opening of the light shielding portion of the base material having a light shielding portion formed on the surface by an inkjet method A method of manufacturing a color filter having a pixel portion of at least four colors including at least,
The colored layer forming step is a step of forming all the colored layers using a number of the colored layer forming coating liquids smaller than the number of colors of the pixel portion, and 2 in at least one pixel portion. A color having a mixed color layer forming step of forming a pixel portion composed of a mixed color layer by applying a color layer or more color layer forming coating liquid to an opening of the same light shielding portion by an inkjet method A method for manufacturing a filter.   In the mixed color layer forming step, the first color layer forming coating solution is applied to the opening of the light shielding portion and cured to form a first color layer, and then the first color layer is formed. The method for producing a color filter according to claim 1, which is a step of applying the second color layer-forming coating solution on the top.   3. The colored layer forming coating liquid selected from red, green, and blue is at least one of the colored layer forming coating liquids forming the mixed color layer. The manufacturing method of the color filter of description.   The combination of the colored layer forming coating solution for forming the mixed color layer is a combination of a blue colored layer forming coating solution and a green colored layer forming coating solution, a blue colored layer forming coating solution and a yellow color. The combination with a coating liquid for forming a colored layer and at least one combination selected from a combination with a coating liquid for forming a green colored layer and a coating liquid for forming a yellow colored layer. A method for producing a color filter according to any one of claims 1 to 3. A color having a base material, a light-shielding portion formed in a pattern on the base material, and a pixel portion of four or more colors including at least red, green, and blue formed by an inkjet method in the opening of the light-shielding portion A filter,
The pixel portion of at least one color is composed of a laminated colored layer formed by laminating two or more colored layers, and the colored layer of at least one color of the laminated colored layer constitutes the pixel portion of another color A color filter characterized by having the same color.   The color filter according to claim 5, wherein the colored layer of at least one color of the laminated colored layer is red, green, or blue.   The combination of the laminated colored layers is at least one combination selected from a combination of a blue colored layer and a green colored layer, a combination of a blue colored layer and a yellow colored layer, and a combination of a green colored layer and a yellow colored layer. The color filter according to claim 5, wherein the color filter is provided.

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