JPH1096810A - Production of color filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily produce an excellent high-definition color filter without mixing of colors, irregular colors or fracture in a pattern in simple processes at a low cost by forming a photosensitive layer comprising polysllane on a substrate and exposing the layer with UV rays to form a latent image of a pattern. SOLUTION: First, methylphenyl polysilane is dissolved in toluene to prepare a toluene soln. having about 15 % concn. The soln. is applied by spin coating on a glass substrate to form a polysilane layer 2 having 2 pm film thickness after dried. Then the polysilane layer 2 is exposed to UV rays 4 from a high pressure mercury lamp through a photomask 3 having transmission patterns for R, G and B colors to forfn a latent image of the color pattern. Then color inks 5 are used to color the latent image of the color pattern of three (R, G and B) colors in one process by ink jet method. Thereby, the number of processes can be largely decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for manufacturing a color filter, and more particularly to a method for manufacturing a color filter for a display device.

[0002]

2. Description of the Related Art Conventionally, as a method for producing a color filter for a display device, a dyeing method, a pigment dispersion method, an electrodeposition method, and a printing method are generally used.

First, the dyeing method will be described below. First, apply and dry a photosensitive material based on natural polymer materials such as gelatin, grew and casein, or synthetic polymer materials such as PVA (polyvinyl alcohol), PVP (polyvinylpyrrolidone) and acrylic. I do.

Next, re-patterning is performed by exposing and developing with ultraviolet rays using a photomask (photolithography method).

[0005] Next, by immersing the substrate in a dyeing solution, the dye is adsorbed and diffused in the dyeable region formed by the patterning to give a color. By repeating the above steps three times, R, G, and B are sequentially configured to produce a color filter.

[0006] The pigment dispersion method uses a photosensitive resist which has been toned with a pigment in advance. Examples of the base polymer of this type of resist include a polymerizable acrylic resin and a crosslinked PVA. This resist is applied on a substrate and re-patterned by a photolithography method in the same manner as the dyeing method. By repeating the above steps, R, G,
Construct B and manufacture a color filter.

The electrodeposition method is a method in which an ITO film (InTiO film) formed on a substrate is etched into a predetermined pattern by a photolithography method, and using this as an electrode, a color material is formed on the electrode by electrophoretic electrodeposition. By changing the electrodes and color materials, three colors of R, G, and B are formed, and a color filter is manufactured.

[0008] There are various printing methods, but in each case, the process of offset printing of a high-viscosity ink on a glass substrate is repeated only three times for each of R, G, and B colors. Easy.

[0009] In addition to the above method, a method for producing a color filter by an ink jet method is disclosed in Japanese Patent Laid-Open No. 17491/1995.
No. 5 proposes this. This has the characteristic that the ink of three colors of R, G and B can be printed on the substrate in one process, and the process is simple.

[0010] One of the methods included in the staining method is as follows.
A method for producing a color filter by dyeing a polysilane layer applied on a substrate with a dye is disclosed in JP-A-5-188215. This method utilizes the fact that when a polysilane is irradiated with ultraviolet rays, silanol groups are generated and the polysilane in the irradiated portion changes from hydrophobic to hydrophilic. That is, after applying and drying polysilane on a substrate, irradiating the substrate with ultraviolet light with a photomask, the substrate is immersed in a dye solution to dye the ultraviolet-irradiated portion that has changed to hydrophilic. This process is called R, G,
B is repeated three times to form three colors to produce a color filter.

[0011]

Among the above methods, except for the ink-jet method, any of the three methods of R, G, B
It is necessary to repeat the number of steps, and there is a problem that the number of steps is large and complicated.

Further, the dyeing method has a problem that after the dyeing of each color, an anti-staining film must be formed in order to prevent color mixing, so that the process is further complicated and the production cost is increased.

In addition, the printing method has an additional problem that a high-viscosity ink is used, so that the end of the pattern is distorted or displaced, so that a predetermined pattern cannot be formed accurately.

In the ink-jet method, when three colors of R, G, and B inks are printed on a glass substrate in one step, the ink does not penetrate on the glass substrate, so that drying is slow, and problems such as color mixing and bleeding occur. There is a problem.

It has been found that the method for dyeing a polysilane layer disclosed in Japanese Patent Application Laid-Open No. 5-188215 has the following problems in addition to the same problems as the above dyeing method. That is, since the adhesive force between the polysilane layer and the substrate is weak, if immersion in the liquid is repeated each time dyeing occurs, the polysilane film is likely to peel off, resulting in a color filter pattern defect. In particular, when a high-definition pattern is formed, there is a problem that the production yield is deteriorated.

As described above, there is a problem in each method, and there is no satisfactory method for producing a color filter.

An object of the present invention is to solve the above-mentioned problems and to provide a color filter manufacturing method capable of easily manufacturing a high-definition color filter free from color mixture, color unevenness and pattern distortion by a simple process at a low cost. It is to provide.

[0018]

In order to achieve the above object, a photosensitive layer made of polysilane provided on a substrate is exposed to ultraviolet light to form a latent image of a pattern, and a step of using a hydrophilic ink. Coloring by an ink-jet method.

Further, it is preferable to use the polysilane represented by the structural formula (I).

[0020]

Embedded image

(Wherein, R ₁ , R ₂ , R ₃ and R ₄ are the same or different and are each an aliphatic hydrocarbon residue having 1 to 12 carbon atoms;
It may be any of an aromatic hydrocarbon residue and an alicyclic hydrocarbon residue, and these groups may have a substituent, and m and n are integers. This polysilane resin is soluble in an organic solvent and may be transparent, uniform, thin and coatable. Also,
The thickness of the polysilane layer is preferably 1 to 10 μm.

The organic solvent for dissolving the above polysilane is
There is no particular limitation as long as it is an evaporable organic solvent capable of dissolving polysilane. Among them, toluene and xylene, which are good solvents for polysilane and have high solubility, are preferable.

When the polysilane layer is exposed to ultraviolet light, the portion of the polysilane layer exposed to ultraviolet light is
Changes from hydrophobic to hydrophilic. On the other hand, the unexposed portion of the polysilane layer maintains a hydrophobic state. Thereby, a hydrophilic color pattern latent image is formed. In addition, it is preferable that the ultraviolet irradiation dose is 0.5 to 10 J / cm ² .

The coloring material contained in the hydrophilic ink is preferably a basic dye. Generally, it is considered that the basic dye is adsorbed on the polysilane layer by interacting with a silanol group formed in the polysilane layer by ultraviolet irradiation. Since the portion of the polysilane layer that has not been exposed to ultraviolet light is hydrophobic, the hydrophilic ink attached to the hydrophilic polysilane layer does not ooze out. Therefore, a high-definition color pattern without color mixture of R, G, and B can be formed.

The ink-jet ink used in the present invention is prepared by dissolving a water-soluble dye at 10% in an aqueous solution containing additives. In this case, examples of the additive include glycerin, diethyl glycol, diethyl glycol monobutyl ether, various alcohols, and acetonitrile. It is preferable to use a mixture of 200 to 2,000 parts of water with respect to 100 parts (parts by weight, the same applies hereinafter) of the additive.

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION

(Embodiment Mode 1) FIG. 1 is a schematic view showing steps in manufacturing a color filter for a display device of the present invention.

First, as shown in FIG. 1A, methylphenylpolysilane was dissolved in toluene to prepare a toluene solution having a concentration of about 15%. This solution was spin-coated on a glass substrate to form a polysilane layer 2 having a thickness of 2 μm after drying.

Next, as shown in FIG. 1 (b), the polysilane layer 2 is passed through a photomask 3 on which R, G, B transmission patterns are formed, and 4J is applied using a high-pressure mercury lamp.
A color pattern latent image was formed by irradiating ultraviolet light 4 at a light intensity of / cm ² .

Thereafter, as shown in FIG. 1C, three colors of R, G, and B are applied to the latent image of the color pattern by one color using an ink-jet method using the following color ink 5.
It is colored in the process. As the ink jet method, any of a commonly used bubble jet type and piezo jet type may be used. In addition, the inkjet apparatus used has a nozzle row in which R, G, and B are arranged side by side on a nozzle surface, and can discharge a predetermined color from a nozzle at a predetermined position by control by a computer or the like.
The coloring area and the coloring pattern can be set arbitrarily. When producing color filters for display devices, scanning in the vertical direction with respect to the nozzle row in consideration of productivity,
Since R, G, and B can be colored at the same time, it is preferable to form the R, G, and B coloring patterns in a line.

Green ink CIBasic Yellow7 0.5 parts CIBasic Blue1 0.5 parts Glycerin 26 parts Water 63 parts Red ink CIBasic Red12 1 part Glycerin 26 parts Water 63 parts Blue ink CIBasic Blue26 1 part Glycerin 26 parts Water 63 parts FIG. As shown in d), the color filter manufactured so far was dried, and then a black matrix 6 was formed in a portion other than the color pattern to complete the color filter.

As a method for forming a black matrix, a method of coating with a resin black, a method of coloring with a black oil-based ink, or a method of exposing the colored polysilane layer over the entire surface and then coloring with a black water-soluble ink may be used. Can be.

Observation of the color filter thus obtained by an optical microscope showed no problems such as peeling of the polysilane layer, color mixing, uneven color, and distortion of the end pattern.

When the visible absorption spectrum of the produced color filter was measured, the transmittance of each color dye at the maximum absorption wavelength was 1% or less, and the polysilane layer was sufficiently colored.

Further, a color liquid crystal panel was manufactured using the above color filters. FIG. 2A is a sectional view of a color liquid crystal panel, and FIG. 2B is a transparent perspective view of the color liquid crystal panel. The color liquid crystal panel has a structure in which a thin film transistor (TFT) substrate 22 made of a transparent insulating substrate and a counter substrate 23 are arranged to face each other, bonded together with a sealant 24 therebetween, and filled with liquid crystal to form a liquid crystal layer 33. That is, the liquid crystal layer 33 is sandwiched between the TFT substrate 22 and the counter substrate 23.

On the TFT substrate 22, pixel electrodes 25 are formed in a matrix, and signal electrodes 26 and scanning electrodes 27 are formed. These signal electrodes 2
A thin film transistor (TFT) 28 is provided near an intersection of the scanning electrode 6 and the scanning electrode 27, and the pixel electrode 25 is connected to the TFT 28.

On the other hand, an ITO film 29 as a common electrode and an alignment film 34 are formed on the counter substrate 23 on a color filter having the color pattern 30 and the black matrix 31 formed as described above. I have.

Further, polarizing plates 35 are provided on both outer surfaces of the TFT substrate 22 and the counter substrate 23, and a color liquid crystal panel as shown in FIG. 2 is completed.

In this embodiment, methylphenylpolysilane is used as the polysilane film. However, ethylphenylpolysilane, butylphenylpolysilane, dibutylpolysilane, dipentylpolysilane, methylbutylpolysilane,
Biphenylmethylpolysilane, methyltolylpolysilane, trimethylphenylpolydidisilane, diphenyldimethylpolydisilane, dihexylpolysilane, and cyclohexylmethylpolysilane may be used.

Embodiment 2 A color filter was obtained in the same manner as in Example 1 except that the following color inks were used. No peeling of the polysilane layer was observed, the transmittance was 1% or less, and the color was sufficiently colored as a color filter.

Green ink CIBasic green4 1 part Acetonitrile 26 parts Water 63 parts Red ink CIBasic Red1 1 part Acetonitrile 26 parts Water 63 parts Blue ink CIBasic Blue1 1 part Acetonitrile 26 parts Water 63 parts In addition to the dyes described in the above examples. , Basic dye C
color Index (CI)
Red 2, Basic Red 27, Basic Violet 3, Basic Violet 7, Basic Violet 10, Basic Blue 3, Basic Blue 77, Basic Proo 124, Basic Green 1, Basic Yellow 1, Basic Yellow 11, Basic Violet 21 or the like may be used.

[0041]

According to the present invention, by coloring by an ink jet printing method, there is no step of dipping in a liquid, and the polysilane film does not peel off. The polysilane layer on which the color pattern latent image was formed was colored in a single step using hydrophilic inks corresponding to the three colors R, G, and B by an inkjet printing method. A polysilane pattern can be obtained. Therefore,
The number of steps can be greatly reduced.

The polysilane represented by the structural formula (I) dissolves well in an organic solvent and has good film formability, so that a uniform photosensitive layer can be formed.

By adopting the method of manufacturing a color filter for a display device according to the present invention, there is no mixed color of R, G, and B, no problem such as peeling of the polysilane layer, and a simple process capable of simultaneously coloring three colors. Thus, an inexpensive and high-definition color filter can be provided.

[Brief description of the drawings]

FIG. 1 is a schematic view illustrating a manufacturing process of a color filter for a display device of the present invention.

FIG. 2 is a cross-sectional view and a transparent perspective view of a color filter for a display device of the present invention.

DESCRIPTION OF SYMBOLS 1 Glass substrate 2 Polysilane layer 3 Mask pattern 4 Ultraviolet 5 Color ink 6 Black matrix 22 Thin film transistor substrate 23 Counter substrate 24 Sealing material 25 Pixel electrode 26 Signal electrode 27 Scan electrode 28 Thin film transistor 29 ITO film 30 Color pattern 31 Black Matrix 33 liquid crystal layer 34 alignment film 35 polarizing plate

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI // B41J 2/01 C09D 11/00 C09D 11/00 B41J 3/04 101Y

Claims (3)

[Claims] 1. A method of forming a latent image of a color pattern by exposing a photosensitive layer made of polysilane provided on a substrate to ultraviolet light, and a step of coloring by a inkjet method using a hydrophilic ink. A method for producing a color filter, comprising: 2. The method according to claim 1, wherein the polysilane is represented by the structural formula (I). Embedded image (Wherein, R ₁ , R ₂ , R ₃ and R ₄ are the same or different and each have an aliphatic hydrocarbon residue having 1 to 12 carbon atoms, an aromatic hydrocarbon residue, and an alicyclic hydrocarbon residue. Any of the groups, and these groups may have a substituent, and m and n are integers.) 3. The coloring material contained in the hydrophilic ink is a basic dye.
3. The method for producing a color filter according to item 1.