JPH095511A - Color filter, production of color filter and liquid crystal display device - Google Patents

Abstract

PURPOSE: To make it possible to form light shielding parts and colored parts free from color mixing, voids and irregular colors with similar stages by forming a light shielding resin layer and a film resin layer arranged with plural transparent colored parts varying in spectral characteristics from each other respectively opposite to the transparent parts of the light shielding resin layer on a transparent substrate. CONSTITUTION: The resin layer 2a which is curable by photoirradiation and heating and has ink acceptability is formed on a transparent substrate 1. After the resin layer 2a is partly cured by photoirradiation and heating, black ink is imparted to the uncured parts of the resin layer 2a and the colored resin layer 2a is cured by photoirradiation and heating, by which the light shielding resin layer 2 is formed. Next, a resin layer 7a which is curable by photoirradiation and heating and has the ink acceptability is formed on the light shielding resin layer 2 and after the resin layer 7a is partly cured by photoirradiation and heating, plural kinds of colored ink 10 varying in the spectral characteristics are applied to the uncured parts of the resin layer 7a. The colored resin layer 7a is then cured by photoirradiation and heating, by which the film resin layers 7 are formed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color filter used in a display device of various electronic devices, a method of manufacturing the color filter, and a liquid crystal display device equipped with the color filter.

[0002]

2. Description of the Related Art Generally, a liquid crystal display device is mounted on a personal computer, a word processor, a car navigation system, a small television, etc., and the demand for it has been increasing in recent years. As the market for liquid crystal display devices expands, the color filters that form the main part of the device are required to meet the requirements of low cost in addition to performance such as high definition, large size, and high quality. Has been.

A color filter for a liquid crystal display device is formed by repeatedly arranging a plurality of colored portions having different spectral characteristics, generally red, green and blue, as pixels on a transparent substrate. In addition, a light-shielding portion called a black matrix is provided between each pixel in order to enhance display contrast. Usually, the light-shielding portion is manufactured by etching a vapor-deposited film of metal chromium or a sputtering film to form a large number of openings. As a method of forming a colored portion that constitutes a pixel, there are a dyeing method, a pigment dispersion method, an electrodeposition method, a printing method, and the like.

The dyeing method involves coating a substrate with a water-soluble polymer such as dyeable casein, gelatin, or PVA, followed by drying.
After irradiating with ultraviolet rays through a photomask, water development is performed to obtain a relief pattern. Next, it is dyed with an acid dye or the like to obtain a first-color coloring pattern. This is repeated 3 times to form red, green and blue color filters.

In the pigment dispersion method, a photosensitive resin layer in which a pigment is dispersed is formed on a substrate, and this is patterned to obtain a first color coloring pattern. This is repeated 3 times to form red, green and blue color filters.

In the electrodeposition method, a transparent electrode is patterned on a substrate and immersed in an electrodeposition coating solution containing a pigment, a resin, an electrolytic solution and the like to obtain a first colored pattern. This is repeated 3 times to form red, green and blue color filters.

In the printing method, a paint in which a pigment is dispersed in a thermosetting resin is repeatedly printed to separately paint three colors of red, green and blue, and then the resin which is a coloring layer is heat-cured to color-filter. To form.

What is common to these methods is that the same process needs to be repeated three times to form red, green and blue pixels, and the number of processes inevitably increases. Manufacturing cost is high.

As a means for improving this point, Japanese Patent Laid-Open No. 61-61
-245106 and Japanese Patent Application Laid-Open No. 1-217302 disclose a method of manufacturing a color filter by an inkjet method.

In Japanese Patent Laid-Open No. 61-245106, a layer to be colored is formed on a substrate, a black black matrix is formed on the layer, and ink is applied to the openings of the black matrix by an ink jet method to give a red color. A method for manufacturing a color filter by coloring in three colors of green and blue is described. Further, in Japanese Patent Application Laid-Open No. 1-217302, a black matrix made of resin is formed on a substrate, a colored layer is applied on the black matrix, and the colored layer at the openings of the black matrix is colored with an ink jet method in red, green, and blue. A method for producing a color filter by coloring is described. However, in these methods, it is difficult to control color mixture, white spots, and color unevenness between the colored portions, and in reality, it is impossible to obtain a sufficiently satisfactory method.

[0011]

Therefore, an object of the present invention is to satisfy the required characteristics such as heat resistance, solvent resistance, and resolution, which are provided in the conventional method, and to prevent color mixture, white spots, and color unevenness, and An object of the present invention is to provide an inexpensive color filter manufacturing method capable of forming a light-shielding portion and a colored portion in the same process, a color filter manufactured by the method, and a liquid crystal display device including the same.

[0012]

The above objects can be achieved by the following means.

That is, according to the present invention, the light-shielding resin layer, in which a large number of transparent portions and the light-shielding portions formed on the periphery thereof are arranged, and the transparent portions of the light-shielding resin layer are opposed to each other and have different spectral characteristics. A color filter comprising a transparent resin and a filter resin layer in which a plurality of transparent colored portions are arranged in an array, and the transparent colored portion is formed by covering the transparent portion and its peripheral portion. Including doing.

Further, according to the present invention, (1) a resin layer which is curable by light irradiation or light irradiation and heating and has ink receptivity is formed on a transparent substrate, and a part of the resin layer is exposed to light. After curing by irradiation or light irradiation and heating, black ink is applied to the uncured portion of the resin layer, and then the colored resin layer is cured by light irradiation or light irradiation and heating to form a light-shielding resin layer. And (2) forming a resin layer which is curable by light irradiation or light irradiation and heating and has ink receptivity on the light-shielding resin layer, and partially irradiates the resin layer with light or light irradiation and heating. After being cured by the method, a plurality of colored inks having different spectral characteristics are applied to the uncured portion of the resin layer, and then the colored resin layer is cured by light irradiation or light irradiation and heating to obtain a filter resin layer. Forming step, (1) above, 2. The method for producing a color filter as described above, which comprises the step 2), and (1) a resin layer which is curable by light irradiation or light irradiation and heating and has ink acceptability on a transparent substrate. After forming and curing a part of the resin layer by light irradiation or light irradiation and heating, a plurality of colored inks having mutually different spectral characteristics are applied to the uncured portion of the resin layer, and then the resin is colored. A step of curing the resin layer by light irradiation or light irradiation and heating to form a filter resin layer, (2) a resin which is curable by light irradiation or light irradiation and heating on the filter resin layer, and has ink receptivity After forming a layer and curing a part of the resin layer by light irradiation or light irradiation and heating, black ink is applied to the uncured portion of the resin layer, and then the colored resin layer is irradiated with light or By light irradiation and heating Forming a light-shielding resin layer by reduction, (1), (2) an above-described production method of a color filter, comprising the steps, that application of the black ink by the inkjet method,
It includes applying the black ink by a spin coating method, applying the black ink by a roll coating method, and applying the black ink by a dipping method.

Further, according to the present invention, a liquid crystal display device is characterized in that a liquid crystal material is arranged between the first substrate on which the color filter is arranged and the second substrate on which the pixel electrode is arranged. Is.

The present invention will be described below with reference to the drawings.

FIG. 1 shows an example of the manufacturing process of the color filter of the present invention, and also shows an example of the configuration of the color filter of the present invention.

In the present invention, a transparent substrate is preferred as the substrate, and a glass substrate is generally used.
The color substrate is not limited to the glass substrate as long as it has necessary properties such as transparency and mechanical strength.

In FIG. 1A, a resin composition which is curable by light irradiation or light irradiation and heating and has ink receptivity is applied onto a substrate 1, and if necessary, prebaked to form a resin layer. It shows a state in which 2a is formed. A coating method such as spin coating, roll coating, or dipping can be used for coating the resin composition, and is not particularly limited.

Next, the area other than the area to be the light-shielding area (the transparent area 4a) is pattern-exposed using the photomask 3 (FIG. 1B), and then the light-shielding area 6a to be the light-shielding area 6a. Is colored with black ink (FIG. 1 (C)). An inkjet method is preferable as a coloring method, but a spin coating method, a roll coating method, a dipping method, or the like can be used in addition to the inkjet method. In addition, 5 is an inkjet head. If necessary, the colored portion is cured by light irradiation or light irradiation and heating to form the light shielding portion 6 (see FIG. 1).
(D)). As a result, the light-shielding resin layer 2 is obtained in which a large number of the transparent portions 4 and the light-shielding portions 6 formed on the periphery thereof are arranged.
On the light-shielding resin layer 2 including the light-shielding portion 6 formed here, a resin composition that is curable by light irradiation or light irradiation and heating and has ink acceptability is applied, and the resin layer 7 is formed.
a is formed (FIG. 1E). Continued Photomask 8
Pattern exposure using the (FIG. 1 (F)), and thereafter, a plurality of colored inks 1 having different spectral characteristics are provided on the planned coloring portion 11a.
0 is colored by an inkjet method (FIG. 1 (G)), and is cured by light irradiation or light irradiation and heating as necessary to have different spectral characteristics of the plurality of transparent colored portions 11, 12, 13 having different spectral characteristics. A filter resin layer 7 in which a plurality of transparent colored portions 11, 12, and 13 are repeated is formed, and thereby a color filter 15 is obtained (FIG. 1 (H)).
9 is a non-colored part.

In this figure, a plurality of transparent coloring parts
Although the colored portions 11, 12, and 13 of the seeds are shown, the present invention is not limited to this, and the colored portions of any kind may be repeated.

The colored portion 11 formed on the filter resin layer 7,
It is desirable that 12 and 13 cover the transparent portion 4 of the light-shielding resin layer 2 and further cover the periphery of the transparent portion 4. That is, it is preferable to form the light shielding portion 6 and the colored portion 11 so as to overlap each other. As a result, it is possible to reliably prevent the occurrence of color mixing and white spots. Light-shielding portion 6 and colored portions 11, 12,
The overlapping width with 13 is preferably about 20 to 60%, particularly about 30 to 50% of the width of the light shielding portion 6. In the above description, the structure in which the light shielding resin layer is formed as the first layer and the filter resin layer is formed as the second layer on the glass substrate (see FIG. 2).
As described in (A)), as shown in FIG. 2B, it is possible to form a filter resin layer as the first layer and a light shielding resin layer as the second layer on the glass substrate. .

As the curable resin composition used in the present invention, any curable resin composition can be used as long as it has ink receptivity and can be cured by light irradiation or light irradiation and heating. Examples of the resin include acrylic resins; epoxy resins; silicone resins; cellulose derivatives such as hydroxypropyl cellulose, hydroxyethyl cellulose, methyl cellulose and carboxymethyl cellulose, or modified products thereof.

Next, a liquid crystal display device having the color filter of the present invention will be described with reference to FIG. FIG.
FIG. 3 is a schematic view showing an example of a liquid crystal display device of the present invention.
In FIG. 3, reference numeral 100 denotes the color filter of the present invention, on which the protective film 45, the common electrode 46,
The first substrate is configured by stacking the alignment films 47. 5
Reference numeral 1 is a transparent substrate, on which a pixel electrode 50 and an alignment film 49 are arranged to form a second substrate. A liquid crystal material 48 is enclosed between both substrates. Reference numerals 41 and 52 denote polarizing plates, and 53 denotes backlight light.

In the liquid crystal display device shown in FIG. 3, pixel electrodes 50 are formed in a matrix on a substrate facing the color filter 100 with the liquid crystal material 48 interposed therebetween. The coloring material forming the color filter is, for example, red, green, or blue at a position facing the pixel electrode 50.

[0026]

EXAMPLES The present invention will be described below with reference to specific examples, but the present invention is not limited thereto. The present invention also includes modifications and substitutions of the constituent elements with known techniques within the scope of achieving the object of the present invention.

Example 1 On a surface-polished non-alkali glass, a photosensitive resin composition made of an acrylic copolymer having the composition shown in Table 1 was applied to form a first photosensitive resin layer. Specifically, after coating the photosensitive resin composition with a spinner, 90
A baking treatment was performed at 20 ° C. for 20 minutes to form a photosensitive resin layer having a film thickness of 2 μm.

[0028]

[Table 1] Then, a part of the photosensitive resin layer was exposed through a photomask so that the area other than the area where the light-shielding portion was to be formed was exposed, and heat treatment was performed on a hot plate at 120 ° C. for 1 minute. Through this step, the photosensitive resin layer was partially cured. A black ink having the composition shown below was colored on the uncured photosensitive resin layer by an inkjet method, and
A baking treatment was performed at 0 ° C. for 20 minutes and at 200 ° C. for 60 minutes to form a black colored light-shielding portion. Next, in the same manner, a second photosensitive resin layer having a film thickness of 1 μm was formed on the first layer having the light shielding part. This time, the photosensitive resin layer was partially cured by performing pattern exposure through a photomask so that the pixels, that is, the regions other than the regions where the transparent colored portions are to be formed, are exposed. The red, green, and blue inks having the compositions shown below were applied to the uncured photosensitive resin layer by an inkjet method. After coloring, at 90 ℃ for 20 minutes and 2
A baking treatment was performed at 00 ° C. for 60 minutes to form red, green and blue color filters. in this case,
The short side width of the transparent portion of the light shielding resin layer was 65 μm, and the short side width of the transparent colored portion of the filter resin layer was 85 μm. Therefore, the peripheral portion of the transparent colored portion was formed so as to cover the light shielding portion. The pitch width of the transparent colored portions was 100 μm. The color filter thus formed had no color mixture, white spots, or color unevenness, and when a liquid crystal display device was manufactured using this color filter, high-definition color display was possible.

[0029]

[Table 2] * 1: C.I. I. Direct Black 154 * 2: C.I. I. Acid Red 35 and C.I. I. Acid Yellow 23 11: 3 mixture * 3: C.I. I. Acid Blue 9 and C.I. I. Acid Yellow 23 11: 3 mixture * 4: C.I. I. Acid Blue 9 and C.I. I. Acid Red 35 11: 3 Mixture Example 2 In the same manner as in Example 1, a red, green and blue color filter was formed on the first layer of the glass substrate, and the second layer was colored black. A colored light shielding part was formed.

The color filter thus formed had no color mixture, white spots, or color unevenness, and when a liquid crystal display device was manufactured using this color filter, high-definition color display was possible. Example 3 In Examples 1 and 2, the black ink was colored by a spin coating method to prepare a color filter.

The color filter thus formed had no color mixture, white spots, or color unevenness, and when a liquid crystal display device was manufactured using this color filter, high-definition color display was possible. Example 4 In Examples 1 and 2, the black ink was colored by a roll coating method to prepare a color filter.

The color filter thus formed had no color mixture, white spots, or color unevenness, and when a liquid crystal display device was manufactured using this color filter, high-definition color display was possible. Example 5 In Examples 1 and 2, the black ink was colored by the dipping method to prepare a color filter.

The color filter thus formed had no color mixture, white spots, or color unevenness, and when a liquid crystal display device was manufactured using this color filter, high-definition color display was possible.

[0034]

According to the present invention, it is possible to provide a highly reliable color filter free from defects such as color mixture, white spots, and color unevenness. A liquid crystal display device provided with this filter can display an excellent image. Moreover, since the light-shielding layer and the colored layer can be formed in the same process, the manufacturing cost can be reduced and an inexpensive color filter can be provided.

[Brief description of drawings]

1A to 1H are manufacturing process diagrams for explaining an example of manufacturing a color filter for liquid crystal of the present invention.

FIG. 2A and FIG. 2B are cross-sectional views showing configuration examples of the color filter of the present invention.

FIG. 3 is a schematic configuration diagram showing a structure of a liquid crystal display device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Substrate 2a Resin layer 2 Light-shielding resin layer 3 Photomask 4a Transparent part planned part 4 Transparent part 5 Inkjet head 6 Light-shielding part 7a Resin layer 7 Filter resin layer 8 Photomask 9 Non-colored part 10 Inkjet 11a Colored planned part 11, 12, 13 Transparent Colored Part 15 Color Filter 41 Polarizing Plate 45 Protective Film 46 Common Electrode 47 Alignment Film 48 Liquid Crystal Material 49 Alignment Film 50 Pixel Electrode 51 Transparent Substrate 52 Polarizing Plate 53 Backlight Light 100 Color Filter of the Present Invention

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location G09F 9/00 321 B41J 3/04 101Z // B29L 31:00 (72) Inventor Katsuhiro Shirota Tokyo 3-30-2 Shimomaruko, Ota-ku Canon Inc.

Claims (9)

[Claims] 1. A light-shielding resin layer in which a plurality of transparent portions and light-shielding portions formed on the periphery thereof are arrayed, and a plurality of transparent colorings facing the transparent portions of the light-shielding resin layer and having mutually different spectral characteristics. A color filter comprising a transparent substrate and a filter resin layer formed by arranging repeating portions. 2. The color filter according to claim 1, wherein the transparent colored portion is formed so as to cover the transparent portion and the peripheral portion thereof. 3. A resin layer which is curable by light irradiation or light irradiation and heating and has ink receptivity is formed on a transparent substrate, and a part of the resin layer is light irradiated or light irradiated. And a step of applying a black ink to the uncured portion of the resin layer after curing by heating, and then curing the colored resin layer by light irradiation or light irradiation and heating to form a light-shielding resin layer, ( 2) A resin layer which is curable by light irradiation or light irradiation and heating and has ink receptivity is formed on the light-shielding resin layer, and a part of the resin layer is cured by light irradiation or light irradiation and heating. Thereafter, a step of applying a plurality of colored inks having mutually different spectral characteristics to the uncured portion of the resin layer, and then curing the colored resin layer by light irradiation or light irradiation and heating to form a filter resin layer , The steps of (1) and (2) above The color filter manufacturing method according to claim 1, characterized in that. 4. A resin layer which is curable by light irradiation or light irradiation and heating and has ink receptivity is formed on a transparent substrate, and a part of the resin layer is light irradiated or light irradiated. After being cured by heating, a plurality of colored inks having mutually different spectral characteristics are applied to the uncured portion of the resin layer, and then the colored resin layer is cured by light irradiation or light irradiation and heating to obtain a filter. A step of forming a resin layer, (2) forming a resin layer which is curable by light irradiation or light irradiation and heating and has ink acceptability on the filter resin layer, and irradiates a part of the resin layer with light or After curing by light irradiation and heating, black ink is applied to the uncured portion of the resin layer, and then the colored resin layer is cured by light irradiation or light irradiation and heating to form a light-shielding resin layer. , The above (1) and (2) Color production method of filter according to claim 1, characterized in that it comprises a. 5. The method for producing a color filter according to claim 3, wherein the black ink is applied by an inkjet method. 6. The method for producing a color filter according to claim 3, wherein the black ink is applied by a spin coating method. 7. The method for producing a color filter according to claim 3, wherein the black ink is applied by a roll coating method. 8. The method for producing a color filter according to claim 3, wherein the black ink is applied by a dipping method. 9. A liquid crystal display characterized in that a liquid crystal material is arranged between a first substrate on which the color filter according to claim 1 is arranged and a second substrate on which pixel electrodes are arranged. apparatus.