JP2001324716A - Color filter for liquid crystal display device, its manufacturing method and color liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a color filter for liquid crystal display device, capable of eliminating alignment treating and a spacer spraying process in an assembling process of a liquid crystal display device, and to provide a color liquid crystal display device with excellent display quality. SOLUTION: A light shielding layer 12, a pixel-shaped color filter layer 13 consisting of red, green and blue layers and a transparent conductive film 14 are formed on a transparent substrate 11 by a well known method. A photosensitive resin layer 15 for forming post spacers and a protrusion layer with a liquid crystal aligning function is formed on the transparent conductive film 14 using the photosensitive resin. The photosensitive resin layer 15 is exposed by using an exposing mask 70 with a post spacer pattern 71 and moreover is again exposed by using an exposing mask 80 with the post spacer pattern 71 and an aligning protrusion pattern 72. The color filter 10 for liquid crystal display device is obtained by development treatment with a specified developer, by heat treatment and by formation of the post spacers 16 and the protrusion layer 17 with the liquid crystal aligning function.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color filter used for a liquid crystal display device and a color liquid crystal display device, and more particularly to a color filter for a liquid crystal display device having a spacer function and a liquid crystal alignment function projection layer, and using the same. Related to color liquid crystal display devices

[0002]

2. Description of the Related Art In a conventional color liquid crystal display device, gaps are formed between substrates by dispersing transparent spherical particles (bead spacers) of glass or synthetic resin called spacers. The positions of the bead spacers are not fixed, and the bead spacers are also present in the display area on the liquid crystal display device substrate (the light transmitting portion of the colored layer excluding the light shielding portion). There is a problem that the display quality of the liquid crystal display device is deteriorated due to the disorder of the alignment near the bead spacer. In addition, since the bead spacers are used in a scattered manner, they are not evenly scattered in the liquid crystal display element, and display quality is adversely affected depending on the distribution of the bead spacers, and there is also a problem in accurately maintaining the cell gap. ing.

As a technique for solving such a problem, for example, a method of forming a protrusion having a spacer function between pixels has been proposed. FIG. 5 is a sectional view of a partial configuration of a color filter 60 for a liquid crystal display device showing such an example. In FIG. 5, a color filter 60 for a liquid crystal display device has a light-shielding layer 62, a pixel-like color filter layer 63, and a transparent conductive film 64 formed on a transparent substrate 61, and a projection having a spacer function on the transparent conductive film 64. A columnar spacer 65 is formed as a part.

FIG. 6 is a partial sectional view of a color liquid crystal display device 200 showing an example in which such a color filter 60 for a liquid crystal display device is used in a liquid crystal display device. 6, a liquid crystal display device 200 includes a liquid crystal display device color filter 60 and an array substrate 70 in which a liquid crystal driving element array 72 is formed on a transparent substrate 71, for example.
The liquid crystal 81 is sealed. Here, the alignment film 33 is formed on the surface of the transparent conductive film 64 of the color filter 60 for the liquid crystal display device and the surface of the liquid crystal driving element array 72 of the array substrate 70.
Further, an alignment film 34 is formed, and the alignment processing is performed so that the liquid crystal molecules are aligned in a predetermined direction.

As the above-mentioned alignment treatment, a rubbing method is generally widely used. In the rubbing method, the orientation is controlled by conditions such as the number of rubbings, the amount of roll pressing, and the material of the roll, so that it is difficult to measure control parameters and to accurately manage the rubbing state. As described above, since the alignment treatment such as rubbing is performed by a physical method, the alignment film is damaged by rubbing such as a scratch, or unevenness is generated, and dust is generated by a rubbing roll or the like. Have a problem.

[0006]

SUMMARY OF THE INVENTION The present invention has been devised in view of the above problems, and has a color filter for a liquid crystal display device which can omit the alignment process and the spacer dispersing process in the process of assembling the liquid crystal display device. To provide a color liquid crystal display device.

[0007]

In order to achieve the above object, the present invention first provides a color filter having at least a light shielding layer, a pixel-like color filter layer and a transparent conductive film on a transparent substrate. 2. A liquid crystal display device according to claim 1, wherein a spacer column is provided on the transparent conductive film on the light-shielding layer, and at least one or more liquid crystal alignment function projection layers are provided on the transparent conductive film on the pixel-like color filter layer. This is a color filter.

According to a second aspect of the present invention, there is provided a method of manufacturing a color filter for a liquid crystal display device according to the first aspect, wherein the spacer pillar and the liquid crystal alignment function projection layer are formed by a mask exposure method. It was done.

Further, in a third aspect of the present invention, there is provided a color liquid crystal display device manufactured using the color filter for a liquid crystal display device according to the first aspect.

[0010]

Embodiments of the present invention will be described below. FIGS. 1A and 1B show an embodiment of a color filter for a liquid crystal display device of the present invention in which a spacer column and a liquid crystal alignment function projection layer are formed on a transparent conductive film of a pixel color filter layer. FIG. 2 is a partial plan view and FIG. 2 is a partial configuration sectional view showing an embodiment of a color liquid crystal display device manufactured using the color filter for a liquid crystal display device of the present invention.

A color filter 1 for a liquid crystal display according to the present invention.
Reference numeral 0 denotes a color in which a light-shielding layer 12, a pixel-like color filter layer 13 made of red, green, and blue and a transparent conductive film 14 are formed on a transparent substrate 11, as shown in FIGS. The filter substrate has a spacer column 16 and a liquid crystal alignment functional projection layer 17 formed thereon.

Hereinafter, a method of manufacturing the color filter 10 for a liquid crystal display of the present invention will be described. 3A to 3E are partial cross-sectional views showing an example of a manufacturing process of the color filter 10 for a liquid crystal display device. First, a light-shielding layer 12, a pixel-like color filter layer 13 of red, green, and blue and a transparent conductive film 14 are formed on a transparent substrate 11 by a known method (see FIG. 3A). Here, the light-shielding layer 12 is also called a black matrix, and is formed by patterning a resin-based photosensitive resin layer in which a light-shielding agent such as carbon black is dispersed. As the resin used for the black matrix,
Although not particularly limited, a photosensitive or non-photosensitive material such as an epoxy resin, an acrylic resin, a urethane resin, a polyester resin, and a polyolefin resin is used. As a black matrix light-shielding agent, a mixture of pigments such as red, blue, and green can be used in addition to metal oxide powders such as carbon black, titanium oxide, and iron tetroxide, metal sulfide powders, and metal powders. .

The pixel-like color filter layer 13 composed of red, green, and blue is formed by patterning a photosensitive resin layer in which an organic pigment is dispersed in an epoxy, acrylic, polyimide, urethane, polyester, or polyvinyl resin. can get. As organic pigments, phthalocyanine, azilake, condensed azo, quinacridone anthraquinone,
A perylene type and a perinone type are used. Further, a dyeing filter obtained by patterning and dyeing a photosensitive resin composed of a dyeable animal protein resin such as gelatin can also be used. As the transparent conductive film 14, an indium oxide-based transparent conductive film is generally used.

Next, a photosensitive resin layer 1 for forming spacer pillars and a liquid crystal alignment function projection layer using a photosensitive resin.
5 (see FIG. 3B). Here, as the photosensitive resin, a photosensitive resin mainly containing a polyimide resin, an epoxy resin, an acrylic resin, a urethane resin, a polyester resin, a polyolefin resin, and a phenol novolak resin can be used.

Next, the photosensitive resin layer 15 is exposed using an exposure mask 40 having a spacer column pattern 41 as shown in FIG. 4A (see FIG. 3C). This exposure process is for forming a spacer pillar latent image on the photosensitive resin layer 15.

Next, the photosensitive resin layer 15 is exposed using an exposure mask 50 having a spacer column pattern 41 and an alignment projection pattern 51 as shown in FIG. 4B (FIG. 3).
(D)). In this exposure process, the exposure amount of the alignment projection pattern 51 is set so as to obtain a proper liquid crystal alignment function projection layer. Further, the spacer column latent image formed by the first exposure process is subjected to the exposure process again by the spacer column pattern 41 of the exposure mask 50, and is set so as to be appropriately exposed in total. As described above, an appropriate liquid crystal alignment functional projection layer and spacer pillar can be obtained by two exposure processes.

In the above example, the spacer column pattern 41
And the alignment projection pattern 51 are formed on separate exposure masks,
The appropriate exposure amount of the spacer pillar and the liquid crystal alignment function projection layer was set in the two exposure processes, but the optical density of the spacer pillar pattern 41 and the alignment projection pattern 51 can be controlled using a halftone mask having a density gradation. For example, it is possible to obtain a predetermined spacer column and a liquid crystal alignment function projection layer by one exposure mask and one exposure process.

Next, the photosensitive resin layer 15 is developed with a predetermined developing solution to form the spacer pillars 16 and the liquid crystal alignment function projection layer 17, thereby obtaining the color filter 10 for a liquid crystal display device of the present invention (FIG. 3). (E)). Here, the spacer pillar 16 is formed on the transparent conductive film 14 on the light-shielding layer 12, and is generally in the shape of a column or polygon having a width of about 10 μm and a height of about 5 μm. The liquid crystal alignment function projection layer 17 is formed on the transparent conductive film 14 on the pixel-like color filter layer 13,
At least one stripe having a width of about 8 μm and a height of about 1.5 μm, such as a triangle, square, rectangle, trapezoid, or semicircle, is formed.

[0019]

The present invention will be described in detail with reference to the following examples. <Example 1> First, a black photosensitive resin in which carbon black was dispersed in an acrylic resin was spin-coated on a transparent substrate 11 made of non-alkali glass (OA-2: manufactured by Nippon Electric Glass Co., Ltd.) having a thickness of 0.7 mm. To form a black photosensitive resin layer, patterning treatment such as exposure and development,
Heat treatment was performed to form a light-shielding layer 12 having a width of 14 μm and a height of 1.3 μm.

Next, a photosensitive resin in which a dianthraquinone pigment is dispersed in an acrylic resin is applied using a spinner to form a red photosensitive resin layer, and patterning such as exposure and development is performed using a predetermined exposure mask. Processing and heat treatment were performed to form a red pixel-like color filter layer 13R having a width of 100 μm and a thickness of 1.3 μm. Similarly, a photosensitive resin in which a phthalocyanine green pigment is dispersed in an acrylic resin is applied using a spinner to form a green photosensitive resin layer, and a predetermined exposure mask is used for patterning such as exposure and development, and heating. After the treatment, a width of 100 μm and a thickness of 1.
A 3 μm green pixel-like color filter layer 13G was formed. Similarly, a photosensitive resin in which a phthalocyanine blue pigment is dispersed in an acrylic resin is applied using a spinner to form a blue photosensitive resin layer, and a predetermined exposure mask is used for patterning such as exposure and development, and heating. By performing the processing, a blue pixel-like color filter layer 13B having a width of 100 μm and a thickness of 1.3 μm was formed.

Next, a 200 nm thick transparent conductive film 14 was formed on the pixel-like color filter layer 13 and the light-shielding layer 12 made of red, green and blue by sputtering an indium oxide-based target.

Next, a photosensitive resin containing an acrylic resin as a main component is applied by a spinner, a photosensitive resin layer 15 is formed on the transparent conductive film 14, and an exposure in which a spacer column pattern 41 is formed at a predetermined position. Using the mask 40, the photosensitive resin layer 15 was exposed to a predetermined amount of light. Further, the photosensitive resin layer 15 is formed using an exposure mask 50 in which spacer column patterns 41 and alignment projection patterns 51 are formed at predetermined positions.
Was exposed to a predetermined amount of light.

Next, a developing process and a heating process are performed with a specified developing solution, and a 10 μm
A spacer column 16 having a corner and a height of 5.5 μm and a stripe-shaped liquid crystal alignment functional projection layer having a width of 8 μm and a height of 1.5 μm are formed on a transparent conductive film 14 on a pixel color filter layer 13 made of red, green and blue. 17 was obtained to obtain a color filter 10 for a liquid crystal display device of the present invention.

<Embodiment 2> An alignment film 33 is formed on both a color filter 10 for a liquid crystal display device of the present invention and an array substrate 20 having a liquid crystal driving element array 22 formed on a transparent substrate 21.
Then, an alignment film 34 was formed, and the peripheral portion was sealed and attached to each other to produce a liquid crystal cell. Further, the liquid crystal 31 was sealed in a liquid crystal cell to obtain a color liquid crystal display device 100 of the present invention.

[0025]

According to the color filter for a liquid crystal display device of the present invention, a spacer column and a liquid crystal alignment function projecting layer can be formed simultaneously by controlling the exposure amount of the photosensitive resin layer. A liquid crystal alignment function projection layer can be obtained. When a color liquid crystal display device is manufactured using the color filter for a liquid crystal display device of the present invention, the steps of rubbing and spacer spraying can be omitted, and a color liquid crystal display device excellent in display quality can be obtained.

[Brief description of the drawings]

FIG. 1A is a partial schematic plan view showing one embodiment of a color filter for a liquid crystal display device of the present invention. (B)
FIG. 1 is a partial schematic cross-sectional view taken along line AA of a partial schematic plan view illustrating an embodiment of a color filter for a liquid crystal display device of the present invention.

FIG. 2 is a partial schematic sectional view showing one embodiment of the color liquid crystal display device of the present invention.

FIGS. 3A to 3E are partial schematic cross-sectional views showing one embodiment of a process for manufacturing a color filter for a liquid crystal display device of the present invention.

FIG. 4A is a partial plan view showing an example of an exposure mask used in an exposure step for forming a spacer column and a liquid crystal alignment function projection layer of a color filter for a liquid crystal display device of the present invention. (B) is a partial plan view showing an example of an exposure mask used in an exposure step for forming a spacer column and a liquid crystal alignment function projection layer of the color filter for a liquid crystal display device of the present invention.

FIG. 5 is a partial schematic plan view showing one embodiment of a conventional color filter for a liquid crystal display device.

FIG. 6 is a partial schematic cross-sectional view showing one embodiment of a conventional color liquid crystal display device.

[Explanation of symbols]

 10, 60 color filter for liquid crystal display device 11, 21, 61, 71 transparent substrate 12, 62 light shielding layer 13, 63 pixel color filter layer 13R red pixel color filter layer 13G ... green pixel-like color filter layer 13B ... blue pixel-like color filter layer 14, 64 ... transparent conductive film 15 ... photosensitive resin layer 16 ... spacer column 17 ... liquid crystal alignment function projection layer 20, 70 ... array Substrates 22, 72 Liquid crystal driving element array 31, 81 Liquid crystal 33, 34 Alignment film 40, 50 Exposure mask 41 Spacer column pattern 51 Alignment projection pattern 65 Column spacer 100, 200 …… Color liquid crystal display

Claims (3)

[Claims] 1. A color filter having at least a light-shielding layer, a pixel-like color filter layer, and a transparent conductive film on a transparent substrate, wherein a spacer pillar is formed on the transparent conductive film on the light-shielding layer and a transparent film on the pixel-like color filter layer. A color filter for a liquid crystal display device, wherein at least one or more liquid crystal alignment function projection layers are provided on a conductive film. 2. The method for manufacturing a color filter for a liquid crystal display device according to claim 1, wherein said spacer pillar and said liquid crystal alignment function projection layer are formed by a mask exposure method. 3. A color liquid crystal display device manufactured using the color filter for a liquid crystal display device according to claim 1.