JPH11352322A - Color filter and color liquid crystal display device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a color filter for preventing the generation of voids in an opening part and cracks to a colored layer in a process for manufacturing the color filter with a color piling-up spacer and to provide a liquid crystal display element of excellent quality with less disturbance in liquid crystal alignment. SOLUTION: In this color filter in which a black matrix 2 is provided on a substrate and respective colored layers 3-5 of three primary colors R, G and B are provided so as to cover an opening part of the black matrix 2, (A) plural color piling-up spacers formed by the lamination of the respective colored layers 3-5 of the three primary colors are provided in a part on the black matrix 2 and (B) at least one of the colored layers 3-5 for covering the opening part of the black matrix 2 is formed continuously from the opening part to the formation position of the spacers.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a color filter having a spacer function and a color liquid crystal display device using the same.

[0002]

2. Description of the Related Art In order to maintain the thickness (cell gap) of a liquid crystal layer, a color liquid crystal display device conventionally used generally includes a thin film transistor (TFT) and an electrode substrate having a plurality of scanning electrodes. Plastic beads, glass beads or glass cut fibers are provided as spacers between the substrate and the color filter side substrate. Here, since the spacers such as the plastic beads are scattered in the airflow, it is not determined which position (in-plane position) of the electrode substrate and the color filter substrate is arranged.

For this reason, there is a problem that the display quality of the liquid crystal display element is deteriorated due to scattering and transmission of light by the spacers located on the pixels.

A liquid crystal display element in which a spacer such as a plastic bead is sprayed and used has the following other problems. That is, the spacer has a spherical or rod-like shape, and contacts with a point or a line during cell compression,
There is a disadvantage that the alignment film and the transparent electrode are damaged, and display defects are likely to occur. Further, there is a disadvantage that the liquid crystal is contaminated by the damage of the alignment film and the transparent electrode, and the effective voltage applied to the liquid crystal is easily lowered.

[0005] In addition, the process of uniformly dispersing the spacers in an air flow has problems that the yield is not good and the productivity is low. Alternatively, it is necessary to classify the particle size distribution of the spacers to be sprayed with high accuracy before use, and it is difficult to obtain a stable display quality liquid crystal display element by a simple method because of high cost.

To solve these problems, Japanese Patent Application Laid-Open No. Sho 56-1
40324, JP-A-63-82405, JP-A-4-93
924, JP-A-5-196946 describes two colors or three colors.
It has been proposed to use a structure in which colored layers of colors are overlapped as a spacer.

Further, as shown in FIG. 9, when a notch is provided between the colored layer pattern covering the opening and the colored layer spacer portion for forming the colored layer spacer, the colored layer and the black matrix portion are formed. Since the overlap width is reduced, the probability of occurrence of white spots without a black matrix or a colored layer increases with an increase in the aperture ratio of the screen, or the heat resistance of the colored layer decreases and cracks may occur from the cutouts. there were.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks of the prior art. It is an object of the present invention to provide a method for manufacturing a color filter with color overlapping spacers, which is effective in eliminating white spots in openings. The purpose is to prevent generation of cracks in the coloring layer.

[0009]

To achieve the above object, a color liquid crystal display device of the present invention has the following arrangement.

That is, in a color filter in which a black matrix is provided on a substrate, and each of the three primary color layers is provided so as to cover an opening of the black matrix, (A) 3 A plurality of color overlapping spacers formed by laminating the respective colored layers of the primary colors are provided, and (B) at least one of the colored layers covering the opening of the black matrix includes:
A color filter formed continuously from the opening to the spacer formation position.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The color filter of the present invention is one in which a black matrix is provided on a substrate, and a plurality of colored layers of three primary colors are arranged thereon. The color filter is composed of a large number of picture elements, with pixels covered by each of the three primary color layers as one picture element.
Here, the black matrix indicates a light-shielding region arranged between the pixels, and is provided to improve the display contrast of the liquid crystal display device.

The transparent substrate among the substrates used for the color filter of the present invention is not particularly limited, and examples thereof include quartz glass, borosilicate glass, aluminosilicate glass, and soda lime glass whose surface is coated with silica. Inorganic glasses and organic plastic films or sheets are preferably used. A drive element such as a thin film transistor, a wiring, or the like may be provided on these substrates as needed.

A black matrix is provided on the substrate. The black matrix may be formed of a metal such as chromium or an oxide thereof, but it is preferable to form a resin black matrix composed of a resin and a light-shielding agent in terms of manufacturing costs and waste disposal costs. A resin black matrix is also preferable in that a sufficient cell gap can be easily secured. In this case, the resin used for the black matrix is not particularly limited, but is a photosensitive or non-photosensitive material such as an epoxy resin, an acrylic resin, a urethane resin, a polyester resin, a polyimide resin, and a polyolefin resin. Is preferably used. The resin for the black matrix is preferably a resin having higher heat resistance than the resin used for the pixels and the protective film, and a polyimide resin is preferably a resin having resistance to the organic solvent used in the process after the formation of the black matrix. Resins are particularly preferably used.

Here, the polyimide resin is not particularly limited, but is usually a polyimide precursor (n = 1) having a structural unit represented by the following general formula [I] as a main component.
~ 2) obtained by imidizing by heating or using a suitable catalyst are suitably used.

[0015]

Embedded image

The polyimide resin may contain a bond other than the imide bond, such as an amide bond, a sulfone bond, an ether bond, and a carbonyl bond, in addition to the imide bond.

In the above general formula [I], R ¹ is a trivalent or tetravalent organic group having at least two or more carbon atoms.
From the viewpoint of heat resistance, R ¹ is preferably a trivalent or tetravalent group containing a cyclic hydrocarbon, an aromatic ring or an aromatic heterocyclic ring and having 6 to 30 carbon atoms. Examples of R ¹ include phenyl, biphenyl, terphenyl, naphthalene, perylene, diphenylether, diphenylsulfone, diphenylpropane, benzophenone, biphenyltrifluoropropane, cyclobutyl, cyclopentyl, and the like. But not limited to these.

R^TwoHas at least two carbon atoms
Is a divalent organic group, but from the viewpoint of heat resistance, R^TwoIs a ring
Containing a hydrocarbon, an aromatic ring or an aromatic heterocycle, and
A divalent group having 6 to 30 carbon atoms is preferable. R^TwoAs an example
Phenyl, biphenyl, terphenyl, naph
Talene group, perylene group, diphenyl ether group, diphe
Nyl sulfone group, diphenylpropane group, benzopheno
Group, biphenyltrifluoropropane group, diphenyl
Methane group, cyclohexylmethane group, etc.
It is not limited to these. Poly with the structural unit [I] as the main component
Ma is R¹ , R ^TwoConsists of one of each of these
Or a copolymer composed of two or more types
It may be a body. Furthermore, the adhesiveness with the substrate is improved
In order to reduce the heat resistance, the diamine component
To form a bis (3-aminopropyl) having a siloxane structure
R) It is preferable to copolymerize tetramethyldisiloxane and the like.
Good.

Specific examples of the polymer containing the structural unit [I] as a main component include pyromellitic dianhydride, 3,3 ', 4,4'-
Benzophenonetetracarboxylic dianhydride, 3,3 ', 4,4'-
Selected from the group consisting of biphenyltrifluoropropanetetracarboxylic dianhydride, 3,3 ', 4,4'-biphenylsulfonetetracarboxylic dianhydride, 2,3,5-tricarboxycyclopentylacetic dianhydride, etc. One or more carboxylic dianhydrides, paraphenylenediamine, 3,3'-diaminodiphenyl ether, 4,4'-diaminodiphenyl ether, 3,4'-diaminodiphenyl ether, 3,3'-diaminodiphenyl sulfone, 4 , 4'-Diaminodiphenylsulfone, 4,4'-Diaminodicyclohexylmethane, 4,4'-
Examples include, but are not limited to, polyimide precursors synthesized from one or more diamines selected from the group such as diaminodiphenylmethane. These polyimide precursors are synthesized by a known method, that is, by selectively combining tetracarboxylic dianhydride and diamine and reacting them in a solvent.

As the light shielding agent for the black matrix, carbon black, titanium oxide, titanium oxynitride,
In addition to metal oxide powder such as manganese oxide and iron tetroxide, metal sulfide powder, and metal powder, a mixture of red, blue, and green pigments and the like can be used. Among them, as a nonmetallic light-shielding agent, carbon black is particularly preferable because of its excellent light-shielding properties. Since carbon black having a good dispersion and a small particle size mainly exhibits a brownish color tone, it is preferable to mix a pigment of a complementary color to carbon black to obtain an achromatic color. Further, as the metal-based light shielding agent, titanium oxynitride, titanium oxide, and manganese oxide are preferable from the viewpoint of dispersibility.

When the resin for the black matrix is polyimide, the black paste solvent is usually N-methyl-2-pyrrolidone, N, N-dimethylacetamide,
Amide polar solvents such as N, N-dimethylformamide,
A lactone polar solvent such as γ-butyrolactone is preferably used.

As a method of dispersing a light-shielding agent such as a pigment of a complementary color to carbon black or carbon black, for example, after mixing a light-shielding agent or a dispersant in a polyimide precursor solution, a three-roll Sand grinder,
There is a method of dispersing in a dispersing machine such as a ball mill, but the method is not particularly limited. In addition, various additives may be added for improving the dispersibility of carbon black, or for improving applicability and leveling property.

As a method for producing a resin black matrix, a black paste is applied to a transparent substrate, dried,
Perform patterning. As a method for applying the black paste, a dip method, a roll coater method, a spinner method, a die coating method, a method using a wire bar, and the like are suitably used, and thereafter, heat drying (semi-curing) is performed using an oven or a hot plate. . The semi-curing conditions vary depending on the resin, solvent and paste coating material used, but it is usually preferable to heat at 60 to 200 ° C. for 1 to 60 minutes.

In the case where the resin is a non-photosensitive resin, the black paste coating obtained in this manner is formed after forming a positive photoresist coating thereon, and then the resin is a photosensitive resin. In some cases, exposure and development are performed as they are or after forming an oxygen barrier film. If necessary, the positive photoresist or the oxygen barrier film is removed, and the film is dried by heating (this cure). The curing conditions are slightly different depending on the coating material when a polyimide resin is obtained from the precursor, but it is generally heated at 200 to 300 ° C. for 1 to 60 minutes. Through the above process, a black matrix is formed on the substrate.

The thickness of the black matrix used in the present invention is preferably 0.1 to 1.5 μm, more preferably 0.8 to 1.2 μm. This film thickness is 0.1 μm
If it is thinner, it is difficult to secure a sufficient cell gap, and if it is a resin black matrix, the light-shielding properties become insufficient, which is not preferable. On the other hand, when the film thickness is larger than 1.5 μm, although the light-shielding property can be ensured, the flatness of the color filter is easily sacrificed, and a step is easily generated. When a surface step is formed, even if a transparent conductive film or a liquid crystal alignment film is formed on the color filter, the step is hardly reduced, and the alignment treatment by rubbing of the liquid crystal alignment film becomes uneven or the cell gap varies. For example, the display quality of the liquid crystal display element is degraded. In such a case, it is effective to provide a transparent protective film on the colored layer in order to reduce the surface step, but it is disadvantageous in that the structure of the color filter becomes complicated and the production cost increases.

The light shielding property of the black matrix is as follows.
It is represented by an OD value (common logarithm of the reciprocal of the transmittance), and is preferably 2.5 or more, more preferably 3.0 or more, in order to improve the display quality of the liquid crystal display element.
The preferred range of the film thickness of the black matrix has been described above, but the upper limit of the OD value should be determined in relation to this.

In order to reduce the influence of the reflected light and improve the display quality of the liquid crystal display device, the reflectance of the black matrix is 2 as the luminosity-corrected reflectance (Y value) in the visible region of 400 to 700 nm. % Or less, more preferably 1% or less.

Normally, between the black matrices (20 to
An opening of 200) μm × (20 to 300) μm is provided, and a plurality of colored layers of each of the three primary colors are arranged so as to cover at least this opening. That is, one opening is covered with any one of the three primary color layers, and a plurality of color layers of each color are arranged.

The coloring layer constituting the color filter contains at least three primary colors. That is, when performing color display by the additive color method, three primary colors of red (R), green (G), and blue (B) are selected. When performing color display by the subtractive color method, cyan (C) and magenta are used. (M) and three primary colors of yellow (Y) are selected. Generally, a picture element for color display can be formed by using an element including these three primary colors as one unit. For the coloring layer, a resin colored with a coloring agent is used.

As the coloring agent used in the coloring layer, organic pigments, inorganic pigments, dyes and the like can be suitably used. Further, various additives such as an ultraviolet absorbing agent, a dispersing agent and a leveling agent are added. You may. As the organic pigment, phthalocyanine-based, aziraki-based, condensed azo-based, quinacridone-based, anthraquinone-based, perylene-based, and perinone-based pigments are preferably used.

As the resin used for the colored layer, a photosensitive or non-photosensitive material such as an epoxy resin, an acrylic resin, a urethane resin, a polyester resin, a polyimide resin, and a polyolefin resin is preferably used. It is preferable to disperse or dissolve the agent in these resins for coloring. Examples of the photosensitive resin include photodecomposable resins, photocrosslinkable resins, and photopolymerizable resins.Especially, monomers, oligomers or polymers having an ethylenically unsaturated bond and an initiator that generates radicals by ultraviolet rays are used. A photosensitive composition, a photosensitive polyamic acid composition and the like are preferably used. As the non-photosensitive resin, those which can be developed with the above various polymers are preferably used.
A resin having heat resistance enough to withstand such heat in a film forming process of a transparent conductive film or a manufacturing process of a liquid crystal display device is preferable, and a resin having resistance to an organic solvent used in a manufacturing process of a liquid crystal display device. Is preferred, and a polyimide resin is particularly preferably used. Here, as a preferable polyimide resin, a polyimide resin preferably used as a material of the above-described resin black matrix can be exemplified.

As a method of forming a colored layer, patterning is performed after coating and drying on a substrate on which a resin black matrix is formed. As a method of obtaining a colored paste by dispersing or dissolving the colorant, after mixing the resin and the colorant in a solvent, three-roll, sand grinder, there is a method of dispersing in a dispersing machine such as a ball mill, The method is not particularly limited.

As a method of applying the colored paste, a dipping method, a roll coater method, a spinner method, a die coating method, a method using a wire bar, or the like is suitably used, as in the case of the black paste. Heat drying (semi-cure) is performed using a plate. The semi-curing conditions vary depending on the resin used, the solvent, and the amount of the paste applied, but it is usually preferable to heat at 60 to 200 ° C. for 1 to 60 minutes.

In the case where the resin is a non-photosensitive resin, the colored paste film thus obtained is formed after forming a positive photoresist film on the non-photosensitive resin. In some cases, exposure and development are performed as they are or after forming an oxygen barrier film. If necessary, the positive type photoresist or the oxygen blocking film is removed and dried by heating (this cure). The curing conditions vary depending on the resin, but when a polyimide resin is obtained from the precursor, it is generally heated at 200 to 300 ° C. for 1 to 60 minutes. Through the above process, a patterned colored layer is formed on the substrate on which the black matrix is formed.

After the first color layer is formed over the entire surface of the substrate on which the black matrix is formed as described above, unnecessary portions are removed by photolithography to obtain a desired pattern of the first color layer. To form
The pattern of the coloring layer covering the black matrix may be a stripe extending in the long side direction of the opening of the black matrix or an island-like square in which the coloring layer is also discontinuously arranged for each opening of the black matrix. This is preferable in that processing of the colored layer is easy. Of the three primary color layers, two or three layers leave a color layer in at least a portion covering the opening of the black matrix and a portion where a spacer is formed by laminating the color layers. In the present invention, it is important that one or two layers of the striped or island-shaped colored layer pattern covering the opening of the black matrix are continuous to the position where the color overlapping spacer is formed on the black matrix. The same operation is repeated for the second and third colors to form a colored layer such that one colored layer remains on the opening of the black matrix and two or three colored layers remain on the spacer. I do. In order to maintain a sufficient height for the spacer, it is preferable to form a colored layer such that three colored layers remain on the spacer.

The coloring layer on the opening and the coloring layer forming the spacer are not separated, and the spacer is formed by laminating the dot pattern and the coloring layer pattern covering the opening.
Here, the colored layer pattern is preferably a pattern having a square shape such as a stripe shape or an island shape. In addition,
The square pattern referred to here is a pattern that does not have a cutout portion surrounded by four sides, and includes a pattern that has minute cutouts on the sides, meandering, rounded corners, and the like. By forming the spacer by laminating the dot pattern and the colored layer pattern covering the opening,
In the case where the dot spacer is formed separately from the colored layer pattern, a notched pattern having discontinuous points as shown in FIG. 9 becomes unnecessary. For this reason, the overlap width of the black matrix and the pixel film pattern is reduced, and white spots without the black matrix and the colored layer occur,
The possibility of cracks occurring at the end of the pattern during the heat treatment is eliminated.

The thickness of the colored layer on the dot pattern which is higher than the surrounding area tends to be smaller than that of the colored layer at the opening of the black matrix. Since the layer is formed continuously from the black matrix opening, the difference between the thickness of the coloring layer on the dot pattern and the thickness of the coloring layer at the opening is reduced, and the stability and reproduction of the manufacturing process are improved. This has the effect of improving the performance. Further, since at least one layer of the coloring layer covering the opening of the black matrix is formed continuously up to the position where the spacer is formed on the black matrix, the inclination around the spacer becomes gentle, and the influence on the alignment film rubbing is reduced. Can be smaller.

The configuration of the present invention in which the spacer is formed by laminating a dot pattern and a colored layer pattern covering the opening will be described more specifically with reference to the drawings. FIG. 2 and FIG. 3 schematically show one embodiment of the present invention. As shown in FIG. 3, a second colored layer (for example, a green layer) is provided on a first colored layer (for example, a blue layer) 3 which covers the opening.
4 and a third colored layer (for example, a red layer) 5 laminated thereon
Are laminated to form a color overlapping spacer. In the opening covered by the second coloring layer 4, as shown in FIGS. 4 and 5, a second coloring layer 4 covering the opening is laminated on the dot pattern 3 composed of the first coloring layer. A dot pattern 5 composed of a third colored layer is laminated thereon to form a color overlapping spacer (particularly, FIG. 5). In the opening covered by the third colored layer 5, a dot pattern composed of the second colored layer 4 is laminated on a dot pattern composed of the first colored layer 3, as shown in FIGS. The third colored layer 5 is laminated thereon to form a color overlapping spacer (FIG. 7).

The thicknesses of the three primary colors are not particularly limited.
Preferably it is 1 to 3 μm per layer. The difference in height between the top surface of the colored layer covering the black matrix opening and the top of the color overlapping spacer, that is, the cell gap is 1.5 to
It is preferably 9 μm. In the present invention, if there is a difference in the thickness of each colored layer and the height of the spacer adjacent to each colored layer, the smallest difference in the height between the upper surface of the colored layer and the top of the adjacent spacer is the smallest. 1.5-9 μm
It is preferred that If the height is smaller than 1.5 μm, a sufficient cell gap cannot be obtained, and
If the thickness exceeds 9 μm, uniform application of the colored layer becomes difficult, and furthermore, the reliability of the transparent conductive film formed on the color filter decreases, which is not preferable.

When the cell gap is maintained using the color filter of the present invention, for example, R,
When G and B are selected and three colors are overlapped, R + G +
The film thickness of B + Bk (black matrix), the film thickness of B + R + Bk for G, and the film thickness of R + G for B
The film thickness of + Bk corresponds to the cell gap in the liquid crystal display. When the dispersibility of the coloring agent is increased in the paste for forming the coloring layer, or the leveling property is improved for the purpose of uniform application, the height of the spacer formed by stacking the coloring layers composed of the three primary colors is determined by the pixel. It is smaller than the sum of the film thicknesses of the three primary color layers in the portion. That is, the cell gap is G + B + B for R.
k is smaller than the film thickness, and similarly for G, B + R
+ Bk and B are smaller than the film thickness of R + G + Bk.

In the present invention, a spacer formed by laminating colored layers of three primary colors is formed on a black matrix. The area and location of the spacer are different from those of the active layer which faces the color filter when a liquid crystal display element is manufactured. It is greatly affected by the structure of the matrix substrate. Therefore, if there is no constraint opposing electrode substrate side is the area and location of the spacer is not particularly limited, considering the size of the pixel, that area per one spacer is 10μm ² ~1000μm ² preferable. If it is smaller than 10 μm ² , it is difficult to form and laminate a precise pattern, and if it is larger than 1000 μm ² , it will be difficult to completely dispose it on a black matrix depending on the shape of the spacer portion.

Next, an example of a color liquid crystal display device manufactured using the above color filter and TFT substrate will be described. FIG. 1 is a schematic sectional view of a preferred embodiment of the color liquid crystal display device. In FIG. 1, 1 is a transparent substrate, 2 is a resin black matrix, 3 is a colored layer such as (B), 4 is a colored layer such as (R), 5 is a colored layer such as (G), 6 is a transparent electrode, and 7 is an orientation. It is a membrane. on the other hand,
13 is a transparent substrate of a transparent electrode substrate facing the color filter, 12 is an electrode attached to a liquid crystal drive circuit, 11 is an insulating film, 10 is a pixel electrode, and 9 is an alignment film. Reference numeral 8 denotes a liquid crystal held between the color filter and the transparent electrode substrate. As shown in FIG. 1, the liquid crystal display device is manufactured with the above-mentioned color filter and the transparent electrode substrate facing each other.
The color filter may include a colored layer and / or
Alternatively, a transparent protective film may be provided on the spacer. The formation of the transparent protective film on the spacer is preferable from the viewpoint of preventing elution of impurities from the spacer into the liquid crystal and improving the strength of the spacer. As the resin used for the transparent protective film, a photosensitive or non-photosensitive material such as an epoxy resin, an acrylic resin, a urethane resin, and a polyimide resin is preferably used. Further, a transparent electrode such as an ITO film is formed on the color filter as needed. As the transparent electrode substrate facing the color filter, a transparent electrode such as an ITO film is provided in a pattern on the transparent substrate. On the transparent electrode substrate, in addition to the transparent electrode, a TFT element, a thin film diode (TFD) element, a scanning line, a signal line, and the like are provided, and a TFT liquid crystal display element and a TFD liquid crystal display element can be manufactured. A liquid crystal alignment film is provided on the color filter having a transparent electrode and the transparent electrode substrate, and is subjected to an alignment process such as rubbing. After the alignment treatment, the color filter and the transparent electrode substrate are attached to each other using a sealant, and after the liquid crystal is injected from an inlet provided in the seal portion, the inlet is sealed. The module is completed by mounting an IC driver and the like after attaching the polarizing plate to the outside of the substrate. A liquid crystal display element without a transparent electrode on the color filter side, for example, a method called in-plane switching (IPS) also has a configuration corresponding to this. In the above, the transmission type liquid crystal display element has been described as an example. However, the present invention can also be provided for a reflection type liquid crystal display element using a reflection type electrode such as aluminum. In the case of a reflection type liquid crystal display element, an opaque electrode having a high reflectance such as aluminum is provided in a pattern on a substrate facing a color filter. Nematic liquid crystal, ferroelectric liquid crystal,
An antiferroelectric liquid crystal, a thresholdless antiferroelectric liquid crystal, and the like are mentioned, but are not particularly limited.

The color liquid crystal display device of the present invention is used for display screens of personal computers, word processors, engineering workstations, navigation systems, liquid crystal televisions, videos, etc., and is also suitable for liquid crystal projection for providing clear images. Used for

[0044]

EXAMPLES The present invention will be described in more detail with reference to the following Examples, which should not be construed as limiting the scope of the present invention.

Example 1 (1) Preparation of resin black matrix 3,3 ', 4,4'-biphenyltetracarboxylic dianhydride, 4,4'
-Diaminodiphenyl ether and bis (3-aminopropyl) tetramethyldisiloxane with N-methyl-2-
The reaction was performed using pyrrolidone as a solvent to obtain a polyimide precursor (polyamic acid) solution.

A carbon black mill base having the following composition was dispersed at 7000 rpm for 30 minutes using a homogenizer, and the glass beads were filtered to prepare a black paste.

Composition of carbon black mill base : Carbon black (MA100, manufactured by Mitsubishi Kasei Co., Ltd.) 4.6 parts Polyimide precursor solution 24.0 parts N-methylpyrrolidone 61.4 parts Glass beads 90.0 parts

A black paste was applied on a 300 × 350 mm non-alkali glass (manufactured by NEC Corporation, OA-2) substrate using a spinner and semi-cured in an oven at 135 ° C. for 20 minutes. Subsequently, a positive resist (Sphipley "Microposit" RC100 30 cp) was applied with a spinner and dried at 90 ° C. for 10 minutes. The resist film thickness was 1.5 μm. Exposure machine P manufactured by Canon Inc.
Exposure was performed using a LA-501F through a photomask.

Next, an aqueous solution containing 2% by weight of tetramethylammonium hydroxide at 23 ° C. was used as a developer.
The substrate was dipped in a developing solution, and simultaneously, the substrate was swung so as to make one reciprocation in a width of 10 cm in 5 seconds, thereby simultaneously developing the positive resist and etching the polyimide precursor. The development time was 60 seconds. After that, the positive resist was peeled off with methylcellosolve acetate, and further 30
After curing at 0 ° C. for 30 minutes, a resin black matrix substrate was obtained. The thickness of the resin black matrix is 0.9
0 μm, and the OD value was 3.0. The reflectance (Y value) at the interface between the resin black matrix and the glass substrate was 1.2%.

(2) Preparation of Colored Layer Next, Color Index No. 653 was used as a red, green and blue pigment, respectively.
00 Dianthraquinone pigment represented by Pigment Red 177, Color Index No. 74265 Phthalocyanine green pigment represented by Pigment Green 36, Color Index No. 74
A phthalocyanine blue pigment represented by 160 Pigment blue 15-4 was prepared. The pigments were mixed and dispersed in a polyimide precursor solution to obtain three kinds of colored pastes of red, green and blue.

First, a blue paste was applied on a resin black matrix substrate and dried with hot air at 80 ° C. for 10 minutes.
Semi-cure at 20 ° C. for 20 minutes. Thereafter, a positive resist (Sphipley "Microposit" RC100 30 cp) was applied by a spinner and dried at 80 ° C. for 20 minutes. Exposure using a mask, alkaline developer (Sphipley "Microposit" 351)
The substrate was dipped, and the development of the positive resist and the etching of the polyimide precursor were simultaneously performed while simultaneously swinging the substrate. Thereafter, the positive resist was peeled off with methyl cellosolve acetate, and cured at 300 ° C. for 30 minutes. The thickness of the colored pixel portion was 2.3 μm.
By this patterning, blue pixels were formed in a stripe shape, and the first step of the spacer was formed on the resin black matrix. The size of the spacer is 25
It was μm square. The spacer pattern was later formed only on the portion where the stripe pattern was formed by the green coloring layer and the red coloring layer.

After washing with water, the second step of the spacer was similarly formed on the resin black matrix together with the formation of the green pixel. The thickness of the green pixel portion was 2.3 μm, and the size of the spacer was 25 μm square. The spacer pattern was formed only on the portion where the stripe pattern was to be formed on the blue stripe and later with a red coloring layer.

After further washing with water, a third step of spacers was formed on a resin black matrix together with formation of a red pixel in the same manner to produce a color filter. The thickness of the red pixel portion is 2.3 μm, and the size of the spacer is 20 μm.
m square. The spacer pattern was formed only on the blue stripe and the green stripe.

The area of the contact portion of the spacer provided on the resin black matrix by lamination of the colored layers was about 400 μm ² per one. The height obtained by subtracting the thickness of the resin black matrix from the height of the spacer from the substrate surface (thickness of three colored layers on the resin black matrix) is 5.6 μm, which is the thickness of each colored layer. (6.9 μm). The spacer was provided in the screen at a rate of one per pixel. In addition, spacers are provided on a part of the frame formed of a resin black matrix around the screen by color overlapping at the same density as in the screen.

(3) Production of color liquid crystal display element
The film was formed as a mask. The thickness of the ITO film was 150 nm, and the surface resistance was 20 Ω / □. A polyimide-based alignment film was provided on the ITO film, and a rubbing treatment was performed.

On the other hand, a transparent electrode substrate provided with a TFT element was manufactured as follows.

First, a chromium film was formed on a transparent alkali-free glass substrate (OA-2, manufactured by NEC Corporation) by sputtering, and the gate electrode was patterned by photolithography. Next, plasma C
A silicon nitride film (SiNx) having a thickness of 700 nm was formed by a VD method to form an insulating film. Subsequently, thickness 1
A 500 nm thick SiNx was continuously formed as a 00 nm amorphous silicon film and an etching stopper film layer. Next, SiNx of the etching stopper layer was patterned by photolithography. An n + amorphous silicon film for forming an ohmic contact was formed and patterned, and an ITO film serving as a display electrode was formed and patterned. Further, an aluminum film as a wiring material was formed, and a drain electrode and a source electrode were formed by photolithography. Using the drain electrode and the source electrode as masks, the n + amorphous silicon film in the channel portion was removed by etching to complete the TFT.

Finally, a polyimide-based alignment film was provided in the same manner as the color filter, and a rubbing treatment was performed.

After a color filter provided with an alignment film and a transparent electrode substrate provided with a thin film transistor element were bonded together using a sealant, liquid crystal was injected from an injection port provided in the seal portion. The liquid crystal was injected by leaving the empty cell under reduced pressure, immersing the injection port in the liquid crystal tank, and returning the pressure to normal pressure. After injecting the liquid crystal, the injection port was sealed, and a polarizing plate was attached to the outside of the substrate to produce a cell. The obtained liquid crystal display element had good display quality.

Example 2 A color filter and a liquid crystal display device were produced in the same manner as in Example 1 except that the shape of the colored layer was changed from a stripe shape to an island shape covering one opening of the black matrix. Further, as shown in FIG. 8, the island-shaped colored layer was extended, and a pattern of 30 μm square was provided at the spacer forming position on the black matrix. The color filter thus obtained was good without cracks or color loss. Further, the display quality of the liquid crystal display element was also good.

Comparative Example 1 A resin black matrix pattern was formed on a transparent alkali-free glass substrate by the same procedure as in Example 1.
In addition, blue, green,
A pattern of a red coloring layer was formed. At this time, the stripe pattern and the spacer dot pattern were separated and fractionated (FIGS. 9 and 10).

In the heat treatment step during the production of the liquid crystal display device, cracks occurred on the colored layer from the notches provided for separation. In addition, white spots occurred on some substrates due to over-etching.

Comparative Example 2 A color filter and a liquid crystal display device were produced in the same manner as in Comparative Example 1, except that the shape of the colored layer was changed from a stripe shape to an island shape covering one opening of the black matrix. As shown in FIG. 11, the island-shaped colored pattern was provided with a notch for separating the spacer without extending to the spacer forming position on the black matrix. The dot pattern of the blue paste was 30 μm square. A notch provided for separation in a heat treatment step at the time of manufacturing a liquid crystal display device caused cracks on the colored layer.

[0064]

By using the color filter having the spacer of the present invention, it is possible to prevent the occurrence of cracks and color omission of the color filter colored layer. In addition, the rubbing of the alignment film can be reduced by reducing the inclination of the spacer.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a color liquid crystal display device using a color filter of the present invention.

FIG. 2 is a plan view showing the vicinity of a spacer formed on a blue colored layer stripe obtained in Example 1.

FIG. 3 is a schematic sectional view taken along line 3-3 'in FIG.

FIG. 4 is a plan view near a spacer formed on a green colored layer stripe obtained in Example 1.

FIG. 5 is a schematic sectional view taken along line 5-5 'in FIG.

FIG. 6 is a plan view showing the vicinity of a spacer formed on a red colored layer stripe obtained in Example 1.

FIG. 7 is a schematic sectional view taken along the line 7-7 ′ in FIG. 6;

FIG. 8 is a plan view of an island-shaped colored layer and a spacer obtained in Example 2.

FIG. 9 is a plan view showing the vicinity of a spacer obtained in Comparative Example 1.

10 is a schematic sectional view taken along line 9-9 'in FIG.

11 is a plan view of an island-shaped colored layer and a spacer shape obtained in Comparative Example 2. FIG.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 transparent substrate (glass substrate) 2 resin black matrix 3 colored layer (B) 4 colored layer (R) 5 colored layer (G) 6 transparent electrode 7 alignment film 8 liquid crystal 9 alignment film 10 pixel electrode 11 insulating film 12 liquid crystal drive circuit Attached electrode 13 Transparent substrate (glass substrate)

Continued on the front page (72) Inventor Tetsuya Goto 1-1-1 Sonoyama, Otsu-shi, Shiga Toray Industries Co., Ltd.

Claims (12)

[Claims] 1. A black matrix is provided on a substrate,
In a color filter provided with each of the three primary color layers so as to cover the opening of the black matrix, (A) a color formed by laminating each of the three primary color layers on a part of the black matrix. (B) A color filter, wherein a plurality of overlapping spacers are provided, and (B) at least one layer of a coloring layer covering the opening of the black matrix is formed continuously from the opening to the position where the spacer is formed. 2. The color filter according to claim 1, wherein a plurality of color overlapping spacers formed by laminating three layers of three primary color layers are provided on a part of the black matrix. 3. The color filter according to claim 1, wherein the color layer pattern covering the opening has a square shape. 4. The color filter according to claim 1, wherein the color layer pattern covering the openings has an island shape in which the color layers are discontinuously arranged for each of the openings. 5. The color filter according to claim 1, wherein the black matrix is a resin black matrix obtained by dispersing a light shielding agent in a resin. 6. The color filter according to claim 1, wherein the resin forming the black matrix is a polyimide resin. 7. The black matrix according to claim 1, wherein said black matrix has a thickness of 0.5.
The color filter according to any one of claims 1 to 6, which has a thickness of 1 to 1.5 µm. 8. The color filter according to claim 1, wherein an OD value of the black matrix is 2.5 or more. 9. The reflectance of the black matrix is 2
The color filter according to any one of claims 1 to 8, wherein the color filter is not more than%. 10. The color filter according to claim 1, wherein a difference in height between an upper surface of the colored layer covering the opening and a top of the color overlapping spacer is 1.5 to 9 μm. 11. The color filter according to claim 1, wherein the colored layer composed of the three primary colors is composed of a polyimide resin. 12. A pair of transparent substrates having transparent electrodes,
12. A color liquid crystal display device comprising a liquid crystal layer sandwiched between both transparent substrates, wherein one of the substrates is the color filter according to any one of claims 1 to 11. Display device.