JP2013015680A - Color filter - Google Patents

Abstract

The present invention has been made in view of the above problems, and can make the luminance of the entire liquid crystal display device having an edge light type surface light source device uniform, and the productivity of the liquid crystal display device. It is a main object to provide a color filter capable of improving the brightness and reducing the manufacturing cost, and a liquid crystal display device capable of reducing luminance unevenness and having high productivity.
A transparent substrate, a light shielding portion formed on the transparent substrate and having an opening, and a plurality of at least a red colored layer, a green colored layer, and a blue colored layer formed in the opening of the light shielding portion. A plurality of sub-pixels composed of a colored layer of color, and a plurality of pixel portions composed of the sub-pixels of each color, and the aperture ratio of the pixel portion arranged at a distance from the light source is The above problem is solved by providing a color filter having a larger aperture ratio than the pixel portion arranged at a short distance from the light source.
[Selection] Figure 2

Description

  The present invention relates to a color filter used in a liquid crystal display device having a liquid crystal panel and an edge light type surface light source device, and a liquid crystal display device using the color filter.

  2. Description of the Related Art Surface light source devices that illuminate a liquid crystal panel from the back side are widely used (see, for example, Patent Documents 1 to 3). The surface light source device is roughly classified into a direct type in which a light source is arranged directly below the optical member and an edge light type in which a light source is arranged on the side of the optical member. The edge light type surface light source device has an advantage that the thickness of the surface light source device can be reduced as compared with the direct type surface light source device.

  In the edge light type surface light source device, a light guide plate is provided on the side of the light source, and light from the light source enters the light guide plate from a side surface (light incident surface) of the light guide plate. The light incident on the light guide plate is repeatedly reflected on a pair of opposing main surfaces of the light guide plate, and travels in the light guide plate in a direction substantially perpendicular to the light incident surface (light guide direction). The light traveling through the light guide plate is gradually emitted from the light exit surface as it travels through the light guide plate due to the optical action from the light guide plate. As a result, the amount of light emitted from the light exit surface of the light guide plate is made uniform along the light guide direction.

By the way, when good image display is performed in a liquid crystal display device, it is required to make the luminance of the entire liquid crystal display device uniform and to suppress the occurrence of luminance unevenness.
Therefore, in the edge light type surface light source device used for the liquid crystal display device, in order to suppress the occurrence of the luminance unevenness of the liquid crystal display device described above, the uniformity of the in-plane distribution of the emitted light quantity in the light guide plate is further improved. It is demanded.

  As a method for improving the uniformity of the in-plane distribution of the amount of emitted light in the light guide plate, for example, a method of providing a dot-like opening on the light exit surface of the light guide plate or a method of embedding materials having different refractive indexes in the light guide plate, etc. A method of directly processing the optical plate, a method of arranging an optical sheet having an optical function such as a diffusion sheet having a diffusion function of diffusing the light emitted from the light guide plate on the light exit surface of the light guide plate, etc. Can be mentioned.

  However, since the above-described method requires processing the light guide plate or forming an optical sheet, the number of steps during manufacturing increases in the liquid crystal display device having the edge light type surface light source device. For this reason, it is difficult to improve the productivity of the liquid crystal display device, and the manufacturing cost is increased.

  Therefore, there is a demand for a liquid crystal display device that has low luminance unevenness, low cost, and high productivity even when the above-described edge light type surface light source device is used.

JP 2007-227405 A JP 2008-296587 A JP-A-9-145931

  The present invention has been made in view of the above-described problems, and the brightness of the entire liquid crystal display device can be made uniform without performing special processing on the light guide plate, thereby improving the productivity of the liquid crystal display device. In addition, it is a main object to provide a color filter that can reduce the manufacturing cost, and a liquid crystal display device that can reduce luminance unevenness and has high productivity.

  In order to solve the above problems, the present invention is a color filter used in a liquid crystal display device having a light source plate and a surface light source device having a light source disposed on the side of the light guide plate, and a liquid crystal panel, A transparent substrate, a light shielding portion formed on the transparent substrate and having an opening, and a plurality of colored layers including at least a red colored layer, a green colored layer, and a blue colored layer formed in the opening of the light shielding portion And the aperture ratio of the pixel unit arranged at a distance far from the light source has a plurality of sub-pixels composed of a plurality of colors and a plurality of pixel units composed of the sub-pixels of each color. Provided is a color filter characterized by being larger than the aperture ratio of the pixel portion arranged at a short distance.

According to the present invention, since the aperture ratio of the pixel unit arranged at a distance far from the light source is larger than the aperture ratio of the pixel unit arranged at a distance near the light source, the entire liquid crystal display device It is possible to adjust the aperture ratios of the plurality of pixel portions in the color filter so that the luminance of each of the color filters becomes uniform. Therefore, in the liquid crystal display device using the color filter of the present invention, it is possible to prevent the occurrence of luminance unevenness and perform good image display.
In addition, since the brightness of the entire liquid crystal display device can be adjusted by using the color filter of the present invention for the liquid crystal display device, it is necessary to perform special processing or the like on the light guide plate in the surface light source device. Therefore, the manufacturing process of the liquid crystal display device can be simplified, and the manufacturing cost can be reduced.

  In the present invention, the ratio of the aperture ratio of the pixel portion arranged at the closest distance from the light source to the aperture ratio of the pixel portion arranged at the farthest distance from the light source is 0.7-0. Is preferably within the range of .98. By adjusting the aperture ratios of the plurality of pixel portions as described above, it is possible to suitably prevent occurrence of luminance unevenness in the liquid crystal display device.

  The present invention provides a liquid crystal display device comprising the above-described color filter, a surface light source device having a light guide plate and a light source disposed on the side of the light guide plate, and a liquid crystal panel.

According to the present invention, by using the color filter, it is possible to perform adjustment so that the luminance of the liquid crystal display device becomes uniform, and therefore, luminance unevenness is reduced and good image display is performed. Can be obtained.
In addition, since the brightness of the entire liquid crystal display device can be adjusted using the color filter, it is not necessary to perform special processing or the like on the light guide plate in the surface light source device. The manufacturing process can be simplified, and the manufacturing cost can be reduced. Therefore, a liquid crystal display device with high productivity and advantageous in cost can be obtained.

In the color filter of the present invention, the aperture ratio of the pixel unit arranged at a distance far from the light source is larger than the aperture ratio of the pixel unit arranged at a distance near the light source. The brightness can be adjusted to be uniform. Therefore, when used in the liquid crystal display device, it is possible to reduce luminance unevenness and to achieve an excellent image display.
Further, according to the present invention, since it is possible to adjust the luminance of the liquid crystal display device using a color filter, the light guide plate used in the surface light source device is subjected to the above-described luminance adjustment process. Therefore, the manufacturing process of the liquid crystal display device can be simplified, and the manufacturing cost can be reduced.

It is a schematic diagram which shows an example of the liquid crystal display device of this invention. It is the schematic which shows an example of the color filter of this invention. It is a schematic plan view which shows the other example of the color filter of this invention. It is a schematic plan view which shows the other example of the color filter of this invention. It is a schematic plan view which shows the other example of the color filter of this invention. It is a schematic plan view which shows the other example of the color filter of this invention. It is a schematic plan view which shows the pattern of the light-shielding part in the comparative example of this invention. It is a schematic plan view which shows the pattern of the light-shielding part in the Example and comparative example of this invention. It is a schematic plan view which shows the pattern of the light-shielding part in the Example of this invention.

  Hereinafter, the color filter and the liquid crystal display device of the present invention will be described.

A. Color Filter First, the color filter of the present invention will be described.
The color filter of the present invention is used in a liquid crystal display device having a light guide plate and a surface light source device having a light source disposed on the side of the light guide plate, and a liquid crystal panel, and includes a transparent substrate and the transparent A plurality of colors composed of a light shielding portion formed on a substrate and having an opening, and a plurality of colored layers formed in the opening of the light shielding portion and including at least a red colored layer, a green colored layer, and a blue colored layer And the aperture ratio of the pixel unit arranged at a distance far from the light source is arranged at a short distance from the light source. The aperture ratio is larger than the aperture ratio of the pixel portion.

  The “aperture ratio of the pixel portion” in the present invention refers to the area of the subpixel of each color constituting one pixel portion with respect to the area W of the region surrounding the central portion of the light-shielding portion that partitions one pixel portion. Indicates the ratio S / W of the sum S. In addition, the “area of the sub-pixel” refers to an area where a monochromatic coloring layer is formed in the opening of the light shielding portion.

  Further, in the present invention, “the aperture ratio of the pixel portion arranged at a distance far from the light source is larger than the aperture ratio of the pixel portion arranged at a distance near the light source” means in the color filter. The aperture ratio of at least one or more pixel portions among the plurality of pixel portions existing in is larger than the aperture ratio of other pixel portions arranged at a distance closer to the light source than the pixel portion.

Here, the color filter of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic view showing an example of a liquid crystal display device using the color filter of the present invention. 2A is a schematic plan view showing an example of the color filter of the present invention, FIG. 2B is a cross-sectional view taken along the line AA in FIG. 2A, and FIG. 2 (a) is a cross-sectional view taken along the line B-B, and FIG. 2 (d) is an enlarged view of a portion C in FIG. 2 (a).

As shown in FIG. 1, the color filter 10 of the present invention is used in a liquid crystal display device 100 having a surface light source device 20 and a liquid crystal panel 30. Since the liquid crystal display device 100 will be described in the section “B. Liquid crystal display device” described later, description thereof is omitted here.
1 and 2A and 2B, the color filter 10 of the present invention includes a transparent substrate 11, a light shielding portion 12 formed on the transparent substrate 11 and having an opening, and a light shielding portion. Sub-pixel 13 (FIGS. 1, 2A, and 2B) formed in at least 12 openings and including at least a red colored layer 13′R, a green colored layer 13′G, and a blue colored layer 13′B. ) Includes a red sub-pixel 13R, a green sub-pixel 13G, and a blue sub-pixel 13B), and a plurality of pixel units 14 including sub-pixels 13R, 13G, and 13B of the respective colors.
Further, as shown in FIGS. 2A and 2C, the color filter 100 according to the present invention has an aperture ratio of the pixel portion 14 located at a distance far from the light source of the opening portion 14 located at a distance near the light source. It is larger than the aperture ratio. 2A and 2C, in the case where the light source of the surface light source device in the liquid crystal display device is arranged along the side X, the pixel unit 14 located at a distance far from the side X on the light source side. An example in which the aperture ratio is continuously larger than the aperture ratio of the opening 14 located at a distance close to the side X on the light source side is shown.

In the present invention, the “aperture ratio of the pixel portion” refers to a region (FIG. 2C) surrounding the central portion of the light shielding portion 12 that partitions one pixel portion 14, as shown in FIG. The ratio S / W of the sum S of the areas S _R , S _G , and S _B of the sub-pixels 13R, 13G, and 13B that constitute one pixel portion 14 with respect to the area W of the region indicated by W1).

  According to the present invention, since the aperture ratio of the pixel unit arranged at a distance far from the light source is larger than the aperture ratio of the pixel unit arranged at a distance near the light source, the entire liquid crystal display device It is possible to adjust the aperture ratios of the plurality of pixel portions in the color filter so that the luminance of each of the color filters becomes uniform. Therefore, in the liquid crystal display device using the color filter of the present invention, it is possible to prevent the occurrence of luminance unevenness and perform good image display.

In the present invention, “the luminance of the entire liquid crystal display device is uniform” means that the luminance of each pixel portion is compared when the luminance of any two pixel portions in a color filter arranged in the liquid crystal display device is compared. It means that the difference is ± 1% or less.
The luminance difference of the pixel unit is calculated from the measured value by measuring the luminance of each pixel unit by arranging a light source plate and a surface light source device having a light source arranged on the side of the light guide plate in the color filter. It shall be.
The luminance can be measured by using, for example, a spectroradiometer SR-3 (manufactured by TOPCON).

  In addition, according to the present invention, since the brightness of the entire liquid crystal display device can be adjusted by using the color filter in the liquid crystal display device, special processing or the like is performed on the light guide plate in the surface light source device. Therefore, the manufacturing process of the liquid crystal display device can be simplified, and the manufacturing cost can be reduced.

  Details of the color filter of the present invention will be described below.

1. Pixel part The pixel part in this invention is comprised from the subpixel of each color.
Further, the present invention is characterized in that the aperture ratio of the pixel portion arranged at a distance far from the light source is larger than the aperture ratio of the pixel portion arranged at a distance near the light source. is there.

  Further, as described above, the aperture ratio of the pixel portion in the present invention is the sum S of the areas of the sub-pixels in the one pixel portion with respect to the area W surrounding the central portion of the light shielding portion that partitions one pixel portion. The ratio is shown.

The aperture ratio of the pixel portion in the present invention is not particularly limited as long as a good image display can be performed when the color filter of the present invention is used in a liquid crystal display device, but 0.55 to 0.98. In particular, it is preferably in the range of 0.58 to 0.95, particularly preferably in the range of 0.60 to 0.90. When the aperture ratio of the pixel portion is less than the above range, the area of the sub-pixel that contributes to image display becomes small, and it may be difficult to perform desired image display using the color filter of the present invention. Because there is. Moreover, when the aperture ratio of the pixel portion exceeds the above range, it may be difficult to partition the pixel portion using the light shielding portion.
In the present invention, it is preferable to change the aperture ratio of the plurality of pixel portions within the above-described range.

  As an adjustment method of the aperture ratio of a plurality of pixel portions in the present invention, the aperture ratio of the pixel portion arranged at a distance far from the light source is equal to the aperture ratio of the pixel portion arranged at a distance close to the light source. The method is not particularly limited as long as the brightness of the entire liquid crystal display device using the color filter of the present invention can be adjusted to be uniform by adjusting the value to be larger.

  Here, the present invention is adjusted by adjusting the aperture ratio of the pixel portion arranged at a distance far from the light source to be larger than the aperture ratio of the pixel portion arranged at a distance near the light source. The reason why the brightness of the entire liquid crystal display device using the color filter can be adjusted to be uniform can be considered as follows.

  That is, when the color filter of the present invention is used in a liquid crystal display device, the color filter is usually disposed on the light exit surface side of the light guide plate of the edge light type surface light source device. Here, the surface light source device has a configuration in which at least one of the four side surfaces of the light guide plate is a light incident surface, and a light source is disposed on the side of the light incident surface. In addition, the surface light source device tends to increase the amount of light emitted from the light guide plate as the distance from the light source decreases, and to decrease the amount of light emitted from the light guide plate as the distance from the light source increases.

  Therefore, the aperture ratios of the plurality of pixel units are set so that the aperture ratio of the pixel unit arranged at a distance far from the light source is larger than the aperture ratio of the pixel unit arranged at a distance near the light source. By adjusting, when the color filter of the present invention is used in a liquid crystal display device, the aperture ratio of the pixel portion is large at a portion far from the light source of the surface light source device. Even if the amount is small, the light utilization efficiency can be improved. On the other hand, in the area where the distance from the light source of the surface light source device is small, since the aperture ratio of the pixel portion is small, the area of the light shielding portion can be increased, so that the light emitted excessively from the light guide plate is efficiently absorbed It becomes possible to do. Therefore, it is possible to suitably prevent the occurrence of uneven brightness due to the difference in the amount of emitted light due to the difference in distance from the light source in the surface light source device.

  Hereinafter, an adjustment method for adjusting the aperture ratios of the plurality of pixel portions in accordance with the distance from the light source (hereinafter, simply referred to as an aperture ratio adjustment method). Will be described in detail.

(1) Adjusting method of aperture ratio As an adjusting method of the aperture ratio in the present invention, the aperture ratio of the pixel portion arranged at a distance far from the light source is larger than the aperture ratio of the pixel portion arranged at a distance near the light source. Thus, there is no particular limitation as long as the aperture ratio of each pixel portion can be adjusted and the occurrence of luminance unevenness can be prevented when the color filter of the present invention is used in a liquid crystal display device. .
Here, the light source in the surface light source device is usually disposed over the entire light incident surface of the light guide plate. Therefore, in the color filter, generally, the light source is generally disposed on at least one side corresponding to the light incident surface of the light guide plate.
Therefore, in the present invention, as shown in FIG. 2A, the aperture ratio of the pixel unit 14 located at a distance far from the side X on the light source side is equal to the aperture ratio of the pixel unit 14 located at a distance near the side X. It is preferable to adjust the aperture ratio of each pixel portion 14 so as to be larger. Moreover, it is preferable that the aperture ratios of the pixel portions 14 located at the same distance from the side X are the same.

Further, in this case, at least in part of the color filter, the aperture ratio of the pixel portion arranged at a distance far from the light source side is larger than the aperture ratio of the pixel portion arranged at a distance near the light source side. However, as shown in FIG. 3, for example, as the distance from the side X on the light source side increases, the aperture ratios of the plurality of pixel units 14 increase stepwise. The aperture ratio of each pixel portion 14 may be adjusted.
In the present invention, “the aperture ratio of a plurality of pixel portions increases stepwise” indicates that the pixel portions increase for each plurality as the distance from the light source side increases. 3 shows an example in which the pixel portion 14 becomes larger every third pixel.

  For example, as shown in FIG. 2A, the aperture of each pixel unit 14 is continuously increased so that the aperture ratio of the plurality of pixel units 14 increases continuously as the distance from the side X on the light source side increases. The rate may be adjusted.

Moreover, in this invention, it is necessary to adjust the aperture ratio of the pixel part of a color filter with the number of the light sources in the surface light source device used with the color filter of this invention.
Here, the surface light source device is not particularly limited as long as it has a light source on the side of at least one of the side surfaces of the light guide plate. However, in the liquid crystal display device, the two side surfaces of the light guide plate facing each other. A surface light source device in which a light source is disposed on the side of the light source plate or a surface light source device in which a light source is disposed on a side of all side surfaces of the light guide plate is preferably used.

Therefore, when the color filter of the present invention is used in combination with a surface light source device in which the light source is disposed on the sides of two opposing side surfaces of the light guide plate, the light source is disposed as shown in FIG. In consideration of the distance from each of the two sides X1 and X2 corresponding to the two opposite side surfaces of the light guide plate, the aperture ratio of the pixel unit 14 arranged at a distance far from the two sides X1 and X2 is It is preferable to adjust the aperture ratio of each pixel unit 14 so as to be larger than the aperture ratio of the pixel unit 14 arranged at a distance close to the two sides X1 and X2.
Further, when the color filter of the present invention is used in combination with the above-described surface light source device in which the light source is disposed on the sides of all the side surfaces of the light guide plate, the light source is disposed as shown in FIG. Considering the distance from each of the four sides X3 to X6 corresponding to the side surface of the light guide plate, the aperture ratio of the pixel portion 14 located at a distance far from the four sides X3 to X6 is closer to the four sides X3 to X6. It is preferable to adjust the aperture ratio of each pixel portion 14 so as to be larger than the aperture ratio of the pixel portion 14 located at a distance.
FIGS. 4A and 4B are schematic plan views showing other examples of the color filter of the present invention, and the reference numerals not described can be the same as those in FIG. Therefore, explanation here is omitted.

  In addition, when adjusting the aperture ratio of a plurality of pixel units according to the distance from the light source, the aperture of the pixel unit arranged at the closest distance from the light source with respect to the aperture ratio of the pixel unit arranged at the farthest distance from the light source The ratio of the rate is not particularly limited as long as the luminance of the entire liquid crystal display device using the color filter of the present invention can be made uniform, but is within the range of 0.70 to 0.98, among others. It is preferable to be within the range of 0.73 to 0.95, particularly within the range of 0.75 to 0.90. This is because when the ratio is less than the above range, the visibility may be reduced due to the difference in the aperture ratio of the pixel portion. When the ratio exceeds the above range, the occurrence of uneven brightness can be prevented. This is because it may be difficult.

  In the present invention, the aperture ratio of the pixel portion is usually adjusted by adjusting the line width of the light shielding portion that partitions the pixel portion and the sub-pixel.

  As a method for adjusting the line width of the light-shielding part, the colored layers of the respective colors provided in the opening part of the light-shielding part can have a desired pattern arrangement, and each of the plurality of pixel parts has a desired aperture ratio. Although it is not particularly limited if possible, as shown in FIG. 5A, the light shielding portion 12a disposed in a substantially parallel direction to the side X on the light source side of the color filter and the light shielding disposed in a substantially vertical direction. Among the portions 12b, the adjustment may be made by changing only the line width of the light shielding portion 12a, or as shown in FIG. 5B, the adjustment may be made by changing only the line width of the light shielding portion 12b. As shown to (a), you may change and adjust the line | wire width of the light-shielding part 12 arrange | positioned in the substantially parallel direction and the substantially perpendicular direction with respect to the edge | side X of the color filter 10 at the light source side. FIGS. 5A and 5B are schematic plan views showing other examples of the color filter of the present invention. The reference numerals not described in FIG. 5 are the same as those in FIG. Since it is possible, description here is abbreviate | omitted.

(2) Pixel part The pixel part in this invention is comprised from the subpixel of each color. As will be described later, since the sub-pixel in the present invention has at least a red colored layer, a green colored layer, and a blue colored layer, one pixel portion in the present invention has at least a red sub-pixel, green It consists of a subpixel and a blue subpixel.

In the present invention, the area of each color sub-pixel in one pixel portion is not particularly limited as long as a good image display can be performed in the liquid crystal display device using the color filter of the present invention. The areas of the subpixels may be the same or different.
Further, the shape of the sub-pixels of each color in one pixel portion is not particularly limited as long as a good image display can be performed in the liquid crystal display device using the color filter of the present invention. The shape may be different.

The number of pixel portions in the present invention is not particularly limited as long as it can have pixel portions having different aperture ratios in the color filter, and is appropriately selected according to the use of the color filter of the present invention. However, it is preferably 32,000 or more, more preferably in the range of 40000 to 12000000, and particularly preferably in the range of 51200 to 3000000. When the number of pixel portions in the present invention is less than the above range, liquid crystal displays using the color filter of the present invention even when the aperture ratios of the plurality of pixel portions in the color filter are adjusted to be different from each other. This is because it may be difficult to sufficiently prevent the occurrence of luminance unevenness in the apparatus.
The upper limit of the number of the pixel portions is about 24000000.

2. Sub-pixel The sub-pixel in the present invention is formed in the opening of the light-shielding portion and is composed of a plurality of colored layers including at least a red colored layer, a green colored layer, and a blue colored layer.
In the color filter of the present invention, at least a red subpixel, a green subpixel, and a blue subpixel are used.

  The area of each color sub-pixel in the present invention is such that the pixel portion in the present invention can have a desired aperture ratio and a good image display can be performed in a liquid crystal display device using the color filter of the present invention. The area is not particularly limited as long as it is a possible area, and is appropriately selected according to the use of the color filter.

  The colored layer constituting the subpixel in the present invention includes at least a red colored layer, a green colored layer, and a blue colored layer. In the present invention, a colored layer other than the above-described colors can be used as necessary.

  The arrangement of the colored layers constituting the sub-pixel is not particularly limited as long as it is an arrangement capable of performing a desired color display when the color filter of the present invention is used in a liquid crystal display device. The arrangement of the colored layers used in the color filter can be the same. Specifically, a stripe arrangement, a mosaic arrangement, a delta arrangement, and the like can be given.

  As the material for the colored layer, pigments and resin materials are used. The pigment, the resin material, and the like can be the same as the pigment, the resin material, and the like used for a coloring layer of a general color filter, and thus the description thereof is omitted here.

  The method for forming the colored layer is not particularly limited as long as it is a method capable of forming a colored layer constituting a desired subpixel, and is the same as the method for forming a colored layer in a general color filter. Can do. Specific examples include a photolithography method, an inkjet method, a printing method, and the like.

3. Light Shielding Part The light shielding part in the present invention is formed on a transparent substrate and has an opening.

  The pattern shape of the light shielding portion is usually selected as appropriate in consideration of the aperture ratio of the pixel portion described above, the arrangement of the colored layers constituting the subpixels, and the like.

  The line width of the light shielding part is not particularly limited as long as the pixel part can be provided in the opening part of the light shielding part and the aperture ratio of the pixel part can be adjusted as described above. It is preferable to be in the range of 60 μm, especially in the range of 6 μm to 55 μm, particularly in the range of 7 μm to 50 μm. If the line width of the light shielding portion is less than the above range, it may be difficult to partition the pixel portion using the light shielding portion, and when the line width of the light shielding portion exceeds the above range, This is because the opening of the light-shielding portion is small and the area of the sub-pixel that contributes to image display is small, which may reduce the visibility of the liquid crystal display device using the color filter of the present invention.

The material of the light shielding part in the present invention is not particularly limited as long as the pixel part can be partitioned, for example, a resin light shielding part in which a black colorant is dispersed or dissolved in a binder resin, chromium, Examples thereof include metal thin films such as chromium oxide.
Note that the black colorant and the binder resin used for the resin light-shielding part can be the same as those used for the light-shielding part of a general color filter, and thus description thereof is omitted here.

The method for forming the light shielding part is not particularly limited as long as the light shielding part can be formed to have a desired pattern shape.
For example, when the light shielding part is a resin light shielding part, a photolithography method, a printing method, and the like can be given.
Further, for example, when the light shielding part is a metal thin film, an evaporation method using a metal mask, a sputtering method, a method of performing an etching process after forming a metal thin film on a transparent substrate, and the like can be exemplified.

  Further, in the present invention, as shown in FIG. 6, at least two colored layers among the colored layers 13′R, 13′G, and 13′B of the respective colors constituting the subpixels 13R, 13G, and 13B of the respective colors. The colored layer laminate 123 in which the red colored layer 13′R and the blue colored layer 13′B in FIG. 6 are laminated can be used as the light shielding portion.

  In this case, the colored layer laminate described above may be used for all of the light shielding portions in the color filter of the present invention, or the colored layer laminate may be used for a part of the light shielding portions.

When a colored layer stack is used for a part of the light shielding portion, for example, as shown in FIG. 5A, the light shielding portion 12 (between the subpixels 13 of different colors, as shown in FIG. 5A) A colored layer stack is used for the light shielding portion 12b), and the light shielding portion 12 (the light shielding portion 12a in FIG. 5A) disposed between the sub-pixels 13 of the same color is made of a metal thin film or a resin light shielding portion. preferable.
By making the configuration of the light shielding portion as described above, the pattern shape of the light shielding portion formed using a metal thin film or the like can be simplified. It becomes easy to adjust the aperture ratio of the pixel portion. In addition, the light-shielding portions arranged between the sub-pixels of different colors can be formed at the same time as the formation of the coloring layer constituting the sub-pixel.

4). Transparent substrate The transparent substrate in this invention supports the light shielding part mentioned above, the colored layer which comprises a subpixel, etc.

  The transparent substrate in the present invention can be the same as that used for a general color filter, and thus the description thereof is omitted here.

5. Other Members 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 transparent substrate described above, and other necessary members can be appropriately selected and used. It is.
Examples of such members include columnar spacers, overcoat layers, liquid crystal alignment control protrusions, and the like.
Note that any of the above-described members can be the same as those used for a general color filter, and thus description thereof is omitted here.

6). Method for Producing Color Filter The method for producing a color filter of the present invention is not particularly limited as long as it can be formed by adjusting the aperture ratios of a plurality of pixel portions as described above. Since it can be the same as the manufacturing method of a filter, description here is abbreviate | omitted.

7). Liquid Crystal Display Device The color filter of the present invention is used for a liquid crystal display device having a light source plate and a surface light source device having a light source disposed on a side surface of the light guide plate, and a liquid crystal panel.
The liquid crystal display device in which the color filter of the present invention is used will be described in the section “B. Liquid crystal display device” to be described later.

B. Next, the liquid crystal display device of the present invention will be described.
A liquid crystal display device of the present invention includes a color filter described in the above-mentioned section “A. Color filter”, a surface light source device having a light guide plate and a light source disposed on a side of the light guide plate, and a liquid crystal panel. It is characterized by having.

Here, the liquid crystal display device of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic view showing an example of the liquid crystal display device of the present invention. As shown in FIG. 1, the liquid crystal display device 100 of the present invention includes a color filter 10, a surface light source device 20 having a light guide plate 21 and a light source 22 disposed on the side of the light guide plate 21, and a liquid crystal panel 30. It is what you have. Since the color filter 10 has been described in the above-mentioned section “A. Color filter”, description thereof is omitted here.

According to the present invention, by using the color filter, it is possible to perform adjustment so that the luminance of the liquid crystal display device becomes uniform, and therefore, luminance unevenness is reduced and good image display is performed. Can be obtained.
In addition, since it is possible to adjust the brightness of the entire liquid crystal display device using the color filter, it is not necessary to process the light guide plate in the surface light source device. Can be simplified, and the manufacturing cost can also be reduced. Therefore, a liquid crystal display device with high productivity and advantageous in cost can be obtained.

  Hereinafter, the liquid crystal display device of the present invention will be described in detail.

1. Color Filter The color filter in the present invention can be the same as that described in the above-mentioned section “A. Color Filter”, and thus the description thereof is omitted here.

2. Surface light source device The surface light source device in this invention has a light-guide plate and the light source arrange | positioned at the side surface of the said light-guide plate.

(1) Light guide plate The light guide plate in the present invention usually has a light output surface, a back surface facing the light output surface, and a side surface located between the light output surface and the back surface, and a light guide on the side where the light source is disposed. The side surface of the light plate is used as the light incident surface. In the light guide plate, light from the light source is incident from the light incident surface and diffused, and then uniform light is emitted from the light exit surface.

  Since the light guide plate can be the same as that used in a general edge light type surface light source device, description thereof is omitted here.

(2) Light source The light source used for this invention is arrange | positioned at the side of a light-guide plate. In addition, the said light source is normally arrange | positioned at the light-incidence surface of a light-guide plate.

As the light source, for example, a fluorescent lamp such as a linear cold cathode tube, a spot LED (light emitting diode), an incandescent lamp, or the like can be used. Among these, LEDs are preferable because they are excellent in color reproducibility, miniaturization, and low power consumption.
When the light source is an LED that emits white light, the number of light sources can be at least uniform white. In addition, when the light sources are three types of LEDs that emit light of colors close to the three primary colors of light, since these three types of LEDs are arranged independently, white illumination light is emitted. Balance adjustment can be easily performed, the quality of the display unit can be improved, and the image can be displayed more beautifully.
When the light source is an array of a plurality of LEDs, the pitch of the LEDs is appropriately adjusted according to the width of the light incident surface, the pitch of the light shielding portions of the color filter described above, and the like.

(3) Other Configurations The surface light source device in the present invention is not particularly limited as long as it has the light guide plate and the light source described above, and a necessary configuration can be appropriately selected and added.
Hereinafter, as such a configuration, it is disposed on the back side of the light guide plate, reflects the light emitted from the back surface of the light guide plate, and enters the light guide plate again, and is disposed on the light exit surface side of the light guide plate. , A diffusion sheet having a function of diffusing transmitted light, a polarizing reflection sheet that is disposed on the light exit surface side of the light guide plate, transmits only a specific polarization component, and reflects other polarization components, and the like be able to.

3. Liquid crystal panel As the liquid crystal panel used in the present invention, a general liquid crystal panel can be used.
The details of the liquid crystal panel are described in various publicly known documents (for example, “Flat Panel Display Dictionary” (published by Tatsuo Uchida, Hiraki Uchiike) published in 2001 by Industrial Research Council). Is omitted.

4). Liquid crystal display device The liquid crystal display device of the present invention is not particularly limited as long as it has the above-described color filter, surface light source device, and liquid crystal panel, and other necessary configurations are appropriately selected and used. Can do.

5. Applications Examples of applications of the liquid crystal display device of the present invention include televisions, personal computers, monitors, digital signage, and the like.

6). Manufacturing Method of Liquid Crystal Display Device The manufacturing method of the liquid crystal display device of the present invention can be the same as a general method, and thus description thereof is omitted here.

  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.

  Hereinafter, the present invention will be described with reference to examples.

  Color filter 1 and color filter 2 were produced by the following procedure.

[Preparation of Color Filter 1]
(Preparation of copolymer resin solution)
In a polymerization tank, 63 parts by mass of methyl methacrylate (MMA), 12 parts by mass of acrylic acid (AA), 6 parts by mass of 2-hydroxyethyl methacrylate (HEMA), and 88 parts by mass of diethylene glycol dimethyl ether (DMDG) are charged. After stirring and dissolving, 7 parts by mass of 2,2′-azobis (2-methylbutyronitrile) was added and dissolved uniformly. Then, it stirred at 85 degreeC under nitrogen stream for 2 hours, and also was made to react at 100 degreeC for 1 hour. Further, 7 parts by mass of glycidyl methacrylate (GMA), 0.4 parts by mass of triethylamine, and 0.2 parts by mass of hydroquinone were added to the obtained solution, and the mixture was stirred at 100 ° C. for 5 hours to obtain a copolymer resin solution ( A solid content of 50%) was obtained.

(Preparation of curable resin composition)
Next, the following materials were stirred and mixed at room temperature to obtain a curable resin composition.
<Composition of curable resin composition>
-16 parts by mass of the above copolymer resin solution (solid content 50%)-24 parts by mass of dipentaerythritol pentaacrylate (Sartomer SR399)-4 parts by mass of orthocresol novolac type epoxy resin (Okasei Shell Epoxy Epicoat 180S70)-2- Methyl-1- (4-methylthiophenyl) -2-morpholinopropan-1-one
4 parts by mass, 52 parts by mass of diethylene glycol dimethyl ether

(Formation of light shielding part)
First, the following components were mixed and sufficiently dispersed with a sand mill to prepare a black pigment dispersion.
<Composition of black pigment dispersion>
・ Black pigment 23 parts by mass ・ Polymer dispersant (Bicchemy Japan Co., Ltd. Disperbyk 111) 2 parts by mass ・ Solvent (diethylene glycol dimethyl ether) 75 parts by mass

Next, the following components were sufficiently mixed to obtain a light shielding part composition.
<Composition of composition for light shielding part>
-61 parts by mass of the black pigment dispersion-20 parts by mass of the curable resin composition-30 parts by mass of diethylene glycol dimethyl ether

The light shielding part composition is applied on a glass substrate (Asahi Glass Co., Ltd. AN material) having a thickness of 1.1 mm as a transparent substrate, and dried at 100 ° C. for 3 minutes to form a light shielding part having a film thickness of about 1 μm. A layer was formed. The light-shielding part forming layer is exposed to a light-shielding pattern with an ultra-high pressure mercury lamp, and then developed with a 0.05 wt% potassium hydroxide aqueous solution. Thereafter, the substrate is left to stand in an atmosphere of 180 ° C. for 30 minutes for heat treatment. To form a light shielding part.
As shown in FIG. 7, the pattern of the light shielding portion is a pattern in which the in-plane is divided into 36, and each divided region has a plurality of pixel portions having a plurality of subpixels as shown in FIG. . In the color filter 1, the aperture ratios of the plurality of pixel portions are the same.

(Formation of colored layer)
On the transparent substrate on which the light-shielding part is formed as described above, a red colored layer forming coating solution having the following composition is applied by spin coating (application thickness: 1.5 μm), and thereafter 3 in an oven at 70 ° C. It dried for minutes and obtained the layer for red colored layer formation. Next, a photomask is placed at a distance of 100 μm from the red colored layer forming layer, and an ultraviolet ray is applied to the region corresponding to the red colored layer forming region for 10 seconds using a 2.0 kW ultra high pressure mercury lamp by a proximity aligner. Irradiated. Subsequently, it was immersed in a 0.05 wt% potassium hydroxide aqueous solution (liquid temperature 23 ° C.) for 1 minute and alkali developed to remove only the uncured portion of the red colored layer forming layer. Thereafter, the transparent substrate was left in an atmosphere of 180 ° C. for 30 minutes to form a red colored layer (red subpixel).
Next, a green color layer (green subpixel) was formed in the same process as the red color layer using a green color layer forming coating solution having the following composition.
Furthermore, a blue colored layer (blue subpixel) was formed in the same process as the red colored layer using a blue colored layer forming coating solution having the following composition.
As a result, a color filter having a plurality of pixel portions each including a red subpixel, a green subpixel, and a blue subpixel was obtained.

<Composition of red colored layer forming coating solution>
CI pigment red 177 (Chromofine Red 6605, manufactured by Dainichi Seika Kogyo Co., Ltd.) 10 parts by mass 3 parts by weight of a polysulfonic acid type polymer dispersant 5 parts by weight of the curable resin composition 82 parts by weight of 3-methoxybutyl acetate Part

<Composition of green colored layer forming coating solution>
CI pigment green 36 (Heliogen Green D9360, manufactured by BASF) 10 parts by mass 3 parts by weight of a polysulfonic acid type polymer dispersant 5 parts by weight of the curable resin composition 82 parts by weight of 3-methoxybutyl acetate

<Composition of blue colored layer forming coating solution>
CI Pigment Blue 15: 6 (Fastogen Blue EP-7, manufactured by DIC) 10 parts by mass 3 parts by weight of a polysulfonic acid type polymer dispersant 5 parts by weight of the curable resin composition 82-methoxy-3-butyl acetate Parts by mass

[Preparation of Color Filter 2]
A color filter was produced in the same manner as the color filter 1 except that the pattern of the light shielding portion was changed to the following pattern.
In the color filter 2, as shown in FIG. 9, the in-plane is divided into 36, and each divided area has a pattern having a plurality of pixel portions having a plurality of sub-pixels as shown in FIG. Further, in the six horizontal rows (A1 to A6) shown in FIG. 9, when the aperture ratio of the pixel portion in the horizontal direction is 1, the aperture ratio of the pixel portion of the color filter 1 is 1. The horizontal width of each subpixel (the width indicated by x in FIG. 8) is adjusted so that A6 is 0.95, A2 and A5 are 0.97, and A3 and A4 are 0.99. The aperture ratio of the pixel portion in each divided area was changed.
In the six vertical columns (B1 to B6) shown in FIG. 9, the aperture ratio of the vertical pixel portion is 0 for B1 and B6 when the vertical aperture ratio of the color filter 1 is 1. .95, B2 and B5 are 0.97, B3 and B4 are 0.99, and the vertical width of each subpixel (the width indicated by y in FIG. 8) is adjusted and divided. The aperture ratio of the pixel portion in each region was changed.

[Evaluation]
The following evaluation was performed using the color filter 2 as an example and the color filter 1 as a comparative example.
The color filter of the embodiment is attached with a light guide plate and a backlight (surface light source device) in which an edge light (light source) is arranged on each side surface (four side surfaces) of the light guide plate. By measuring the luminance of the 16-point pixel portion, the luminance of each pixel portion having a different aperture ratio was measured using a spectroradiometer SR-3 (manufactured by TOPCON).
Similarly, the color filter of the comparative example was mounted with the above-described backlight, and the luminance of the pixel portion corresponding to the pixel portion measured in the example (16 points I to XVI shown in FIG. 7) was measured.
The results are shown in Table 1.

The luminance difference in Table 1 indicates the difference between the Max white luminance and the Min white luminance. Further, by using the luminance difference, it is possible to numerically investigate how much the amplitude difference has a fluctuation range with respect to the average value of the white luminance at the 16 points described above. Further, the smaller the brightness difference is, the smaller the fluctuation width with respect to the average value is.
As described above, the use of the light-shielding portion in the example in which the aperture ratio has been changed reduces the luminance fluctuation width compared to the case of using the light-shielding portion in the comparative example having a uniform aperture ratio. It was confirmed that uneven brightness can be prevented.

DESCRIPTION OF SYMBOLS 10 ... Color filter 11 ... Transparent substrate 12 ... Light-shielding part 13 ... Subpixel 13'R ... Red colored layer 13'G ... Green colored layer 13'B ... Blue colored layer 14 ... Pixel part 20 ... Surface light source device 21 ... Light guide plate 22 ... Light source 30 ... Liquid crystal panel

Claims (3)

A color filter used in a liquid crystal display device having a light source plate and a surface light source device having a light source disposed on a side of the light guide plate, and a liquid crystal panel,
A transparent substrate, a light shielding portion formed on the transparent substrate and having an opening, and a plurality of colored layers formed in the opening of the light shielding portion and including at least a red colored layer, a green colored layer, and a blue colored layer A plurality of color sub-pixels composed of:
A plurality of pixel portions composed of the sub-pixels of each color,
The color filter according to claim 1, wherein the aperture ratio of the pixel portion arranged at a distance far from the light source is larger than the aperture ratio of the pixel portion arranged at a distance near the light source.   The ratio of the aperture ratio of the pixel portion arranged at the closest distance from the light source to the aperture ratio of the pixel portion arranged at the farthest distance from the light source is within a range of 0.7 to 0.98. The color filter according to claim 1, wherein: The color filter according to claim 1 or 2,
A surface light source device having a light guide plate and a light source disposed on a side of the light guide plate;
A liquid crystal display device comprising a liquid crystal panel.

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