JPH10104643A - Color filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the time needed for a liquid crystal injecting process shorter than before and to leave no air bubble by providing a liquid crystal injection guide formed by laminating colored layers on a black matrix used as a liquid crystal injection hole when a liquid crystal cell is assembled. SOLUTION: The black matrix 14 is provided at the peripheral edge of a color filter 12 and there is a part used as the liquid crystal injection hole 16 when the liquid crystal cell is assembled by sticking the black matrix on a transparent electrode substrate. On the part used as the liquid crystal injection hole 16, the liquid crystal injection guide 18 is provided. The liquid crystal injection guide 18 is constituted by laminating two or three colored layers. This liquid crystal injection guide 18 suppresses the generation of a turbulent flow of liquid crystal when the liquid crystal is injected, and consequently the loss of injection pressure (pressure obtained by subtracting injection resistance from the pressure difference between the reduced pressure of the liquid crystal cell and external pressure) is reduced, so that the liquid crystal can be injected in a shorter time than before.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a color filter used for a liquid crystal display device such as a personal computer and a word processor.

[0002]

2. Description of the Related Art In a liquid crystal display device such as a personal computer or a word processor, a color filter and a transparent electrode substrate such as a TFT array substrate are attached to each other, and liquid crystal is injected into a space (cell) formed therebetween. It is manufactured by 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. That is, a black matrix is provided on a transparent substrate such as a glass substrate, and a plurality of colored layers each having three primary colors are arranged thereon. Here, the black matrix indicates a light shielding area arranged between each pixel,
It is provided to improve the display contrast of the liquid crystal display device. When the color filter and the transparent electrode substrate are bonded to each other, a spacer is used to form a space between the color filter and the transparent electrode substrate so that a cell for injecting liquid crystal is formed therebetween. As the spacer, plastic beads, glass beads, glass cut fibers, or the like are used. These are dispersed on a color filter or a transparent electrode substrate, and then bonded to the transparent electrode substrate or the color filter. Then, a gap (cell gap) is generated between the color filter and the transparent electrode substrate by the spacer. When bonding the color filter and the transparent electrode substrate, a sealant such as an epoxy sealant is applied to a peripheral portion of the transparent electrode substrate, and thereafter, is bonded. At this time, a sealing agent is not applied to a portion where the liquid crystal is injected into the cell after bonding. Therefore, when the color filter and the transparent electrode substrate are bonded together, only the liquid crystal injection port is opened, and the other portions are sealed with a sealant. Liquid crystal is injected into the cell from the liquid crystal injection port, and then the liquid crystal injection port is sealed, whereby a liquid crystal display device is manufactured.

[0003]

In the conventional liquid crystal display device, a portion serving as a liquid crystal injection port is formed by simply applying no sealant as described above, and is merely an opening. It is necessary to completely fill the cell with liquid crystal so that air bubbles do not remain in the cell. In a conventional manufacturing process of a liquid crystal display device, the liquid crystal injection step is performed as follows.
In the case of a 3-inch liquid crystal display, it took about 4 hours, which was time-consuming.

Accordingly, an object of the present invention is to provide a color filter capable of reducing the time required for a liquid crystal injection step in the manufacture of a liquid crystal display device as compared with the conventional one, and preventing bubbles from remaining.

[0005]

Means for Solving the Problems As a result of intensive studies, the inventors of the present invention have found that one of the reasons why the liquid crystal injection process takes a long time is that a turbulent flow of the liquid crystal occurs in the liquid crystal injection port at the time of liquid crystal injection and a pressure loss occurs. In addition, it is possible to suppress the occurrence of turbulence during liquid crystal injection by providing a liquid crystal injection guide in a region serving as a liquid crystal injection port of the color filter, thereby reducing the time required for the liquid crystal injection step. It has been found that the length can be shortened or that no bubbles are left, and the present invention has been completed.

That is, the present invention relates to a color filter comprising a black matrix provided on a transparent substrate and a plurality of colored layers of each of the three primary colors arranged thereon. At least 2 on the black matrix corresponding to
A color filter with a liquid crystal injection guide provided with a liquid crystal injection guide formed by laminating colored layers.

[0007]

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 transparent substrate, and a plurality of colored layers of three primary colors are further arranged thereon.
As the black matrix, a resin black matrix composed of a resin and a light-shielding agent is preferable. 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 used for the color filter is not particularly limited, and inorganic glass such as quartz glass, borosilicate glass, aluminosilicate glass, soda lime glass whose surface is coated with silica, etc.
Organic plastic films or sheets are preferably used.

A black matrix is provided on the transparent 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. 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.

[0011]

Embedded image

[0012] The polyimide resin may contain a bond other than an 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 ² is a divalent organic group having at least two or more carbon atoms, but from the viewpoint of heat resistance, R ² contains a cyclic hydrocarbon, an aromatic ring or an aromatic heterocyclic ring; A divalent group having 6 to 30 carbon atoms is preferable. Examples of R ² include a phenyl group, a biphenyl group, a terphenyl group, a naphthalene group, a perylene group, a diphenylether group, a diphenylsulfone group, a diphenylpropane group, a benzophenone group, a biphenyltrifluoropropane group, a diphenylmethane group, and a cyclohexylmethane group. But not limited thereto. The polymer having the structural unit [I] as a main component may be a copolymer in which R ¹ and R ² are each composed of one or more of them. . Further, in order to improve the adhesiveness to the substrate, it is preferable to copolymerize bis (3-aminopropyl) tetramethyldisiloxane having a siloxane structure as the diamine component as long as the heat resistance is not reduced.

As specific examples of the polymer having the structural unit [I] as a main component, 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.

Examples of the light shielding agent for the black matrix include a mixture of red, blue and green pigments in addition to metal oxide powder such as carbon black, titanium oxide and iron tetroxide, metal sulfide powder and metal powder. Can be used. Among them,
In particular, carbon black has excellent light-shielding properties and is particularly preferable. 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.

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 applied amount, 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 film obtained in this manner 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 photoresist or the oxygen barrier film is removed, and the film is dried by heating (this cure). These curing conditions are slightly different depending on the coating amount 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 transparent substrate.

The thickness of the resin black matrix is preferably 0.5 to 1.5 μm, more preferably 0.8 to 1.5 μm.
1.2 μm. If the thickness is smaller than 0.5 μm, it is difficult to secure a sufficient cell gap, and
It is not preferable because the light-shielding property becomes insufficient. 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. To reduce the surface step, it is effective to provide a transparent protective film on the colored layer, but it is disadvantageous in that the structure of the color filter becomes complicated and the manufacturing cost increases.

The light-shielding property of the resin black matrix is represented by an OD value (common logarithm of a reciprocal of transmittance).
In order to improve the display quality of the liquid crystal display device, it is preferably at least 2.5, more preferably at least 3.0. The preferred range of the thickness of the resin black matrix has been described above, but the upper limit of the OD value should be determined in relation to this.

The reflectance of the resin black matrix is a reflectance (Y value) corrected for visibility in a visible region of 400 to 700 nm in order to reduce the influence of reflected light and improve the display quality of a liquid crystal display device. It is preferably at most 2%, more preferably at most 1%.

Usually, (2)
An opening of 0 to 200) μm × (20 to 300) μm is provided.
A plurality of primary color layers are arranged. 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 absorber, 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 for 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 for applying the colored paste, a dipping method, a roll coater method, a spinner method, a die coating method, a method using a wire bar, and the like are preferably 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 a positive photoresist film is formed 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 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 resin black matrix is formed as described above, unnecessary portions are removed by photolithography to form a desired first color pattern. Form.
In this case, a colored layer is left at least in a portion covering the opening of the resin black matrix (the colored layer forming the liquid crystal injection guide will be described later). The same operation is repeated for the second and third colors, and a colored layer is formed such that one colored layer remains on the opening of the resin black matrix.

The thicknesses of the three primary colors are not particularly limited.
Preferably it is 1 to 3 μm per layer. Each film thickness is 1
If it is less than 3 μm, it is difficult to obtain sufficient color filter characteristics. If it is more than 3 μm, it is difficult to apply the colored layer uniformly, and furthermore, the grooves formed between the colored layers (the height of the black matrix and the height of the colored layer) Difference, that is, a step) is likely to be an obstacle in achieving a suitable liquid crystal alignment.

As will be described in the following examples, the spacer may be made of plastic beads, glass beads, or the like that are scattered on the transparent electrode substrate when the color filter and the transparent electrode substrate are bonded. When the colored layer is formed by photolithography as described above, the colored layer is formed by performing patterning so as to remain in the form of dots on the black matrix. There may be. The dot spacer composed of a colored layer may be composed of two colored layers, but is preferably composed of three colored layers from the viewpoint of securing a sufficient cell gap. The coloring layer on the opening and the coloring layer forming the spacer may be continuous or separated. However, when the ITO film formed on the color filter is disconnected between the coloring layer and the spacer on the opening to prevent conduction between the color filter side and the counter substrate, the coloring layer and the spacer on the opening are formed. It is preferable that the color layer is separated and fractionated.

The height of the spacer (in the case of glass beads or glass cut fibers, their diameter) is 3 μm.
About m to 9 μm is preferable. If it is less than 3 μm, a sufficient cell gap cannot be obtained, and if it exceeds 9 μm, the reliability of the transparent conductive film formed on the color filter decreases, which is not preferable.

In the color filter of the present invention, a liquid crystal injection guide formed by laminating at least two colored layers on a black matrix corresponding to a portion used as a liquid crystal injection port when assembling a liquid crystal cell is provided.
Hereinafter, the liquid crystal injection guide will be described in detail with reference to the drawings.

As shown in FIG. 2, the color filter 12
Are usually produced on one transparent substrate (two surfaces in FIG. 2). The periphery of the color filter 12 (a part usually called a "frame") is a black matrix 14, and there is a part 16 used as a liquid crystal injection port when assembling a liquid crystal cell by bonding it to a transparent electrode substrate. The length of the portion 16 used as a liquid crystal injection port is usually about several mm to 30 mm. FIG. 1 schematically shows an enlarged view of the vicinity of the portion 16 used as a liquid crystal injection port. In the color filter of the present invention, a liquid crystal injection guide 18 is provided on the portion 16 used as a liquid crystal injection port. The liquid crystal injection guide 18 can be formed by performing patterning so that the colored layer of the color filter is formed by photolithography so that the colored layer remains also in the portion where the liquid crystal injection guide 18 is formed. FIG. 3 shows an end view of a section taken along line 3-3 ′ in FIG. FIG. 3 shows a state after the liquid crystal cell is assembled. The transparent electrode substrate 22 is placed on the color filter, and the portions other than the liquid crystal inlet 16 are sealed with a sealing agent 24 such as an epoxy sealing agent. It is sealed. As shown in FIG. 3, the liquid crystal injection guide 18 is formed by laminating two or three colored layers (three layers are shown).

The shape of the liquid crystal injection guide 18 is not particularly limited, but is preferably substantially rectangular (for example, a rectangle with rounded corners) or substantially elliptical when viewed from above. In this case, it is preferable that the liquid crystal injection guide is formed so that the longitudinal direction is directed to the in-screen direction, that is, the longitudinal direction is parallel to the flow of the liquid crystal at the time of liquid crystal injection (see FIG. 1). . Further, the end of the liquid crystal injection guide may or may not be aligned with the inner end (end in contact with the screen) or the outer end (end opposite to the screen) of the frame.

Since the height of the liquid crystal injection guide 18 corresponds to the height of two or three colored layers, it is preferably 2 μm to 9 μm.
μm. The liquid crystal injection guide may be in contact with or away from the transparent electrode substrate as long as the liquid crystal injection guide suppresses turbulence and has a rectifying action. Assuming that the diameter of the spherical or cylindrical spacer used in forming the liquid crystal cell is φ μm and the height of the liquid crystal injection guide is h μm, the relational expression expressed by φ−2 μm <h <φ + 2 μm is satisfied. preferable. Within this range, the height of the liquid crystal injection guide is at least half the height of the liquid crystal injection port, and the effect can be obtained. When the diameter exceeds φ + 2 μm, the inflow portion expands, affecting the cell gap in the screen, and may cause display unevenness.

The length of the liquid crystal injection guide (the length in the screen direction) is not particularly limited, but is 0.02 mm to 1 mm.
The width is preferably about 0.0 mm, and the width (the direction perpendicular to the in-screen direction) is preferably about 0.01 mm to 5.0 mm. Here, the length is always greater than the width. Further, it is preferable that a plurality of liquid crystal injection guides 18 are formed at a ratio of one per 0.02 mm to 10.0 mm, and it is preferable that the liquid crystal injection guides 18 are formed at substantially equal intervals over substantially the entire area of the liquid crystal injection port 16. .

The liquid crystal injection guide is formed on the black matrix 14 of the liquid crystal injection port 16 as shown in FIG.
Can also be formed on the transparent substrate 10 outside. This embodiment is shown in FIGS. 4, 5, 6 and 7. FIG.
As shown in FIGS. 5 and 6, a liquid crystal injection guide 20 similar to the liquid crystal injection guide 18 is also formed on the transparent substrate 10. The preferred shape, dimensions, and
The arrangement interval is the same as that of the liquid crystal injection guide 18 described above. In the embodiment shown in FIG. 5, a liquid crystal injection guide 20 'is further provided outside the liquid crystal injection guide 20. In this case, the preferred dimensions of the liquid crystal injection guide 20 ′ are about 0.2 to 3 mm in the longitudinal direction and 0.01 to 2.
It is about 5 mm. In addition, the arrangement interval is 0.02 to 5 mm
The degree is preferred. FIG. 7 is a sectional view taken along line 7-7 'of FIG. This is an example in which the liquid crystal injection guide is extended continuously from the injection port black matrix portion to the outside.

The method of manufacturing a liquid crystal display device using the above-described color filter of the present invention is the same as the conventional method.
Spray spherical or cylindrical spacers on a transparent electrode substrate such as an array substrate (if dot spacers made of a colored layer are formed, spraying of spherical or cylindrical spacers is not necessary), and the liquid crystal cell is overlapped with a color filter. Then, a portion other than the portion serving as the liquid crystal injection port is sealed with a sealant such as an epoxy sealant (preferably including a spacer such as a glass cut fiber). And a liquid crystal display device can be manufactured by sealing the liquid crystal injection port.

As described above, in the color filter of the present invention, the liquid crystal injection guide suppresses the generation of turbulence of the liquid crystal during liquid crystal injection, thereby reducing the injection pressure (the pressure difference between the reduced pressure of the liquid crystal cell and the external pressure). , The loss of the injection resistance (including the resistance due to the occurrence of turbulence) is reduced, and the liquid crystal can be injected in a shorter time than before.

[0043]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below more specifically based on embodiments. However, the present invention is not limited to the following examples.

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 to 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. This is a pattern in which a color filter on one surface where the center of the color filter overlaps the center of the glass substrate is designed.

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, as a red, green and blue pigment, Color Index No. 653
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 2.1 μm.
A blue pixel was formed by this patterning. At this time, patterning was performed so that a liquid crystal injection guide composed of seven blue colored layers remained at intervals of 3 mm on the black matrix in a portion (width 25 mm) serving as a liquid crystal injection port.
The liquid crystal injection guide has a substantially rectangular shape with rounded corners,
The longitudinal direction was 2 mm and the width direction was 0.2 mm. Seven liquid crystal injection guides were provided in parallel so that the longitudinal direction of the liquid crystal injection guide was on the inner side of the screen. The size of the color filter is 11.3 inches.

After washing with water, similarly to the formation of the green pixel, the second stage of the liquid crystal injection guide was formed on the first layer of the liquid crystal injection guide. The thickness (after curing) of the green pixel portion was 2.1 μm.

Further, after washing with water, the third stage of the liquid crystal injection guide was formed on the second layer of the liquid crystal injection guide together with the formation of the red pixel in the same manner, thereby producing a color filter.
The thickness (after curing) of the red pixel portion was 2.1 μm.

The height of the liquid crystal injection guide provided as described above on the resin black matrix by laminating the colored layers (the height of the liquid crystal injection guide from the black matrix) was 5.7 μm.

A plastic spherical spacer having a diameter φ of 5.0 μm is sprinkled on the TFT array substrate at a rate of 5 to 6 per pixel, and an epoxy sealant mixed with a glass fiber spacer having a diameter of 6.7 μm is injected into the TFT array substrate. Then, the above-mentioned color filter was stuck thereon and hot-pressed to produce an empty cell. 120 empty cells
After drying at 2 ° C. and 1 Torr for 2 hours, breaking the vacuum with dry nitrogen gas to return to normal pressure, degassing again in the liquid crystal injection tank, immersing the injection port in the liquid crystal dish, and vacuuming with dry nitrogen gas And the injection of the liquid crystal was started, and it was observed that the cell was filled with the liquid crystal. The liquid crystal was vigorously sucked into the cell along with the vacuum break and spread in a fan shape, and the cell was completely filled in 2.5 hours without any bubbles remaining.

COMPARATIVE EXAMPLE 1 Except that no liquid crystal injection guide was provided, an empty cell was prepared and liquid crystal injection was performed in exactly the same manner as in Example 1. The liquid crystal was sucked into the cell in a fan shape with a larger angle than in Example 1 and slightly more slowly than in Example 1. 3. Until the cell is completely filled with liquid crystal
It took 0 hours.

[0056]

According to the present invention, there has been provided a color filter capable of reducing the time required for a liquid crystal injection step in the manufacture of a liquid crystal display device as compared with the related art. That is,
In the color filter of the present invention, the liquid crystal injection guide suppresses the generation of turbulence of the liquid crystal during liquid crystal injection, thereby reducing the loss of injection pressure and injecting liquid crystal in a shorter time without leaving bubbles. The effect that it can be performed is produced.

[Brief description of the drawings]

FIG. 1 is an enlarged schematic view showing a portion serving as a liquid crystal injection port when assembling a liquid crystal cell and its vicinity in one embodiment of the color filter of the present invention.

FIG. 2 is a diagram showing a state in which a plurality of color filters are formed on a transparent substrate.

FIG. 3 is a sectional view taken along line 3-3 ′ of FIG. 1;

FIG. 4 is an enlarged schematic view showing a portion serving as a liquid crystal injection port when assembling a liquid crystal cell and the vicinity thereof in another embodiment of the color filter of the present invention.

FIG. 5 is an enlarged schematic view showing a portion serving as a liquid crystal injection port when assembling a liquid crystal cell and the vicinity thereof in still another embodiment of the color filter of the present invention.

FIG. 6 is an enlarged schematic view showing a portion serving as a liquid crystal injection port at the time of assembling a liquid crystal cell and its vicinity in still another embodiment of the color filter of the present invention.

FIG. 7 is an end view taken along the line 7-7 'of FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Transparent substrate 12 Color filter 14 Black matrix at the periphery of color filter 16 Portion to be liquid crystal injection port when assembling liquid crystal cell 18 Liquid crystal injection guide 20 Liquid crystal injection guide provided on transparent substrate 20 'Liquid crystal provided on transparent substrate Injection guide 22 Transparent electrode substrate 24 Sealant

Claims (7)

[Claims] 1. A color filter comprising a black matrix provided on a transparent substrate and a plurality of colored layers of each of the three primary colors arranged thereon, wherein a black portion corresponding to a portion used as a liquid crystal injection port when assembling a liquid crystal cell. A color filter with a liquid crystal injection guide, wherein a liquid crystal injection guide formed by laminating at least two colored layers on a matrix is provided. 2. The color filter according to claim 1, wherein the black matrix is a resin black matrix. 3. The color filter according to claim 1, wherein the liquid crystal injection guide has a substantially rectangular shape or a substantially elliptical shape, and a longitudinal direction of the liquid crystal injection guide is directed to an in-screen direction. 4. The length of the liquid crystal injection guide in the longitudinal direction is 0.02.
mm to 10.0 mm, and the width in the direction perpendicular to the longitudinal direction is
The color filter according to claim 3, wherein the color filter has a thickness of 0.01 mm to 5.0 mm. 5. The liquid crystal injection guide is 0.02 mm to 10.0 mm.
5. A method according to claim 1, wherein a plurality of wires are formed at a ratio of one.
The color filter according to any one of the above. 6. The color filter according to claim 1, wherein the liquid crystal injection guide is also formed on the transparent substrate outside the liquid crystal injection port. 7. When the diameter of a spherical or cylindrical scatter spacer used in forming a liquid crystal cell is φ μm and the height of the liquid crystal injection guide is h μm, φ−2 μm <h
The color filter according to claim 1, wherein a relational expression represented by <φ + 2 μm is satisfied.