JPS6275602A - Preparation of color-filter - Google Patents

Abstract

PURPOSE:To obtain a color filter having high heat resistance and high weather resistance by dyeing an activated film layer consisting of activated alumina or activated silica with a dye. CONSTITUTION:An activated film layer 2 is formed on a transparent base plate 1 with resin soln. contg. dispersed colloidal alumina particles or/and colloidal silica particles, thus, a base plate 3 for color filter is prepd. Then, a dye film layer 6 is formed on a base sheet 4 using an ink contg. a dye 5, thus, a transfer sheet 7 is prepd. Further, the transfer sheet 7 is mounted on the base plate 3 for the color filter so as to bring the activated film layer 2 in contact with the dye film layer 6 with each other. The sheet is irradiated with laser light from above the base sheet 4, and a desired pattern 8 is formed by transferring the dye in the dye film layer 6 to the activated film layer 2. The procedure is repeated corresponding to the number of kind of necessary color, and a coating layer 10 for sealing the upper side of fine pores 9 in the activated film layer 2 is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for manufacturing a color filter used in various display devices. The present invention relates to a method of manufacturing a color filter to make this possible.

<Prior Art> A color filter for a liquid crystal display device will be described below as a representative example.

2. Description of the Related Art Liquid crystal display devices are widely used for digital display in desktop electronic computers, electronic clocks, etc., or for analog display in measuring and instrumentation equipment, household electronic equipment, audio equipment, etc.

Recently, there has been an increasing demand for color displays of liquid crystal display devices for use in peripheral terminal displays of various devices, as well as for displays in various meters in automobiles, telephones, and television receivers. In order to meet this demand, various color liquid crystal display devices have been proposed, some of which have already been put into practical use. However, none of the currently proposed color display systems for liquid crystal display devices fully satisfies the needs of those who use them.

Conventionally, the following gelatin film method is the most common method for manufacturing color filters applied to liquid crystal display devices capable of color display.

In detail, this method is such that a gelatin layer is formed on the inner surface of a transparent substrate, a pattern-forming film is placed on top of the gelatin layer, and the gelatin layer is then exposed to light to harden the required portions, followed by washing and drying.

Next, a color filter is manufactured by dyeing the hardened gelatin layer and then forming an overcoat layer.

<Problems to be Solved by the Invention> However, this method has the following drawbacks. That is, there are many manufacturing steps, and in particular, in the case of multiple colors, the aforementioned steps must be repeated, which significantly increases the number of manufacturing steps. Furthermore, it is difficult to automate these processes, which increases production costs.

An object of the present invention is to provide a method for manufacturing with high productivity a color filter having a highly accurate pattern and excellent physical properties.

<Means for Solving the Problems> In view of the drawbacks of the conventional method as described above, the present inventors have conducted extensive research and experiments in an effort to establish a method for manufacturing color filters that can eliminate the above-mentioned drawbacks. As a result, we have finally completed the present invention. That is, the present invention provides (a
l Step of obtaining a color filter substrate 3 by forming an active film layer 2 on a transparent substrate l using a resin solution in which colloidal alumina particles and/or colloidal silica particles are dispersed; A step of obtaining a transfer sheet 7 by forming a dye film layer 6 using an ink containing a dye 5, a step of forming the transfer sheet 7 on the FC+color filter substrate 3, and depositing the transfer sheet 7 on the active film layer 2 and the dye film layer 6. So that they touch! ! +d+ step of transferring the dye in the dye film layer 6 to the active film layer 2 by irradiating laser light from four directions of the mace sheet to form a desired color pattern 8; (e)
A step of repeating the steps (bl to (d)) according to the required number of colors; A method for manufacturing a color filter, characterized in that:

Hereinafter, the configuration of the present invention will be explained in detail with reference to the drawings.

Note that the drawings are drawn in an exaggerated manner, ignoring the relative dimensional relationships of the constituent elements, for clarity of illustration.

The transparent substrate l used in the present invention may be one used in liquid crystal display devices on ships, and usually a glass substrate is preferably used.

A color filter substrate 3 is obtained by forming an active film layer 2 made of at least one of activated alumina and activated silica on this transparent substrate 1.

To form this active film layer 2, first, colloidal alumina particles, colloidal silica particles,
Or using resin 78 liquid in which a mixture of both is dispersed,
Spray, spinner, dipping, coating,
After coating by a method such as printing and drying, for example, 350
Bake at °C to 850 °C for 10 minutes to 180 minutes.

The active film layer 2 thus obtained is transparent and has a large number of micropores 9 formed therein, and serves as a dyed layer. Note that the active film N2 has a thickness of 1 μm to 10 μm, preferably 2 μm to 2 μm, considering its transparency, surface hardness, dye receptivity, etc.
A layer thickness of 5 μm is preferred. This is because when the layer thickness of the active film layer 2 becomes thicker, it tends to whiten and become opaque, and on the other hand, when the layer thickness becomes thinner, the dyeing density cannot be obtained.

Next, the transfer sheet 7 is obtained by forming a dye film +56 on the base sheet 4 by a method such as printing or coating using an ink containing a dye.

As the base sheet 4, a composite or composite sheet selected from the group consisting of paper, synthetic paper, metal foil, and plastic film is used.

Dyes that can be used in the present invention include sublimable dyes and/or dyes that evaporate by heat melting. Specifically, there are disperse dyes, metal-free oil-soluble dyes, cationic dyes, and the like.

The dye is added to an oil-soluble binder in a weight ratio of 5 to 50%, and if necessary, additives are added to form an ink.

The thickness of the dye film N6 varies depending on the dye composition ratio of the ink used, but for example, if the dye composition ratio is 10%, the film thickness will be in the range of 1 to IO μm.

Next, the transfer sheet 7 is placed on the color filter substrate 3 (see FIG. 2).

When placed in R, the active film layer 2 and the dye film layer 6 are placed so as to be in contact with each other.

Next, the base sheet 4 is irradiated with laser light from above.

By doing so, the dye in the dye film layer 6 migrates to the active film layer 2 to form a desired color pattern 8.

The laser beam used in the present invention is a high-energy gas laser, preferably an argon ion laser that emits light at 514.5 nm. When irradiating,
The laser beam is applied onto the base sheet 4 with a thickness of 1 to 10 μm2.
This is performed using a laser that converges within the spot and has an energy output of at least 50 mW on the base sheet 4.

To dye the active film layer 2 in a pattern using, for example, red dye ink under the above conditions, scan while irradiating only the necessary areas with a laser beam as shown in Figure 2. Base sheet 4 after wearing? JI let go.

Further, a blue dye film N6 is placed on the active film layer 2 dyed with the red pattern, and a similar dyeing process is performed to form a pattern without misalignment between the red and blue colors on the active film layer 2. Can be formed on top.

If the number of colors is to be further increased, the objective can be achieved by sequentially repeating the same dyeing process according to the required number of colors.

Through the above processing, the dye can be transferred into the micropores 9 of the active film layer 2 to form the color pattern 8. Even if the color pattern 8 is a dot pattern, it can be easily formed.

In this case, the pattern formed by dyeing is a color pattern consisting of two or more colors, and each color pattern is a transparent conductive film pattern corresponding to each color pattern. It is formed by precisely positioning it.

Next, a coating layer IO for sealing the holes in the micropores 9 of the active membrane layer 2 is formed (see FIG. 1).

This coat layer 10 is made of acrylic, melamine, epoxy,
A hard and transparent resin solution such as silicone polymer or polyimide is applied onto the micropores 9 of the active film layer 2 by spraying, spinner, dipping, coating, printing, etc., and then the resin is applied. It is obtained by heating at a temperature such that it hardens. In addition, it can also be obtained by coating and heating inorganic materials such as sodium silicate and lithium silicate, and chemicals such as phosphotungstic acid, phosphomolybdic acid, and tannic acid.

The coating layer 10 thus obtained prevents re-vaporization of dye molecules trapped in the micropores 9 of the active membrane layer 2, prevents contamination with unnecessary substances, and improves surface smoothness. It is useful for

In addition, when forming this coat layer 10, if the color filter obtained by the present invention is covered with a transparent conductive film exhibiting a desired pattern in a subsequent process, the coat layer l
O can be formed using a substance that has excellent adhesion to the substance constituting the transparent conductive film, which greatly contributes to improving the adhesion between the color filter and the transparent conductive film, and is extremely suitable. .

The method for producing a color filter according to the present invention consists of the steps described above, and when using the color filter obtained according to the present invention, a transparent conductive film is appropriately provided on the color filter, and an alignment film is further applied as necessary. It is preferable to provide a structure in which a liquid crystal is sealed between the transparent substrate and the corresponding transparent substrate, and this is further sandwiched between two polarizing plates (see FIG. 3). However, this structure is an example of a liquid crystal display device, and the present invention is not limited to this structure.

<Effects of the Invention> Since the method for manufacturing a color filter according to the present invention has the above configuration, it has the following effects. That is, the color filter obtained by the present invention has excellent physical properties such as heat resistance and weather resistance because the active film layer made of activated alumina or activated silica is dyed with dye, and the color filter formed by the color pattern has excellent physical properties such as heat resistance and weather resistance. is highly accurate, and the surface of the obtained color filter is excellent in smoothness. Moreover, the method of the present invention allows dyeing the active membrane layer with any number of colors, so multicolored color filters can be manufactured with high productivity in significantly fewer steps than in the conventional gelatin membrane method. It is.

[Brief explanation of drawings]

FIG. 1 is a schematic enlarged sectional view of a color filter according to the present invention. FIG. 2 is a schematic enlarged sectional view showing the manufacturing process of a color filter according to the present invention. Third
The figure shows a liquid crystal display W using a color filter according to the present invention.
It is a typical enlarged sectional view of an example of ig. In the figure, 1 ----1 transparent store plate 2-- active film layer 3--- 1 force U-- filter substrate 4--- 5-- Hose sort 5-- 1 dye 6-- dye film layer 7-- transfer sort 8 color pattern 9----Micro holes 10--1--Coating layer 11a, llb--i3 Meidenki 12--Spacer 13--Liquid crystal 14--Transparent electrode 15--M pieces of light Film processing 6- Alignment film 17---- Substrate patent distributor Nissha Printing Co., Ltd. 2 Company Figure 1 Ray dimensions - Light

Claims (1)

[Claims] 1. (a) Step of obtaining a color filter substrate by forming an active film layer on a transparent substrate using a resin solution in which colloidal alumina particles and/or colloidal silica particles are dispersed. (b) obtaining a transfer sheet by forming a dye film layer on the base sheet using an ink containing a dye; (c) forming the transfer sheet on the color filter substrate, forming the active film layer and the dye film layer on the base sheet; (d) irradiating the base sheet with laser light from above to transfer the dye in the dye film layer to the active film layer to form a desired color pattern; (e) Repeating the steps (b) to (d) according to the number of colors required; (f) Forming a coating layer for sealing the upper part of the micropores of the active film layer. A method for producing a color filter, comprising the steps of: 2. The color filter according to claim 1, wherein the base sheet is a single or composite sheet selected from the group consisting of paper, synthetic paper, metal foil, and plastic film. Production method. 3. The method for producing a color filter according to claim 1, wherein the dye is a sublimable dye or/and a dye that is heat-melted and vaporized. 4. The method for producing a color filter according to claim 1, further comprising a transparent conductive film exhibiting a desired pattern formed to cover the coating layer. 5. The color pattern formed by transferring the dye is a color pattern composed of two or more colors, and the transparent conductive film is composed of a pattern corresponding to the color pattern of each color, and the color pattern corresponds to the color pattern of each color. 5. The method of manufacturing a color filter according to claim 4, wherein the transparent conductive film pattern is formed in exact alignment with the transparent conductive film pattern. 6. The method for manufacturing a color filter according to claim 4 or 5, wherein the coating layer is made of a resin that has high adhesiveness to the substance constituting the transparent conductive film.