JPH11153709A - Production of color filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a process for producing color filters capable of uniformly adhering plural pixel material drops to each of the many blocks formed by a black matrix. SOLUTION: This process for producing the color filters consists in forming the prescribed color patterns by adhering the pixel material drop DI to the blocks A formed by the black matrix on a transparent substrate. Before the pixel material drops dry, another pixel material drops of the same color are adhered in overlap. When the another pixel material drops of the same color are adhered in overlap before the pixel material drops dry, the pixel material drops are evenly and uniformly spread within the blocks by the surface tension of the pixel material drops with each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a method for manufacturing a color filter.

[0002]

2. Description of the Related Art In the production of a color filter, an ink-jet method is a preferable method because an ink droplet of a pixel material can be accurately patterned in a short time. For example, JP-A-59-75205 discloses an ink-jet method. A method for manufacturing a color filter is disclosed.

[0003]

In a color filter, for example, a color filter for a TFT liquid crystal display panel, the shape of a pixel is not simple because of the arrangement of a driving transistor, and one corner of a rectangular shape is notched. It has a bent shape. Usually, when manufacturing a color filter, a predetermined number of ink droplets are applied to each section formed by a black matrix, for example, as shown in FIG. At this time, the ink droplets DI applied to each section A spread in a circular shape. For this reason, when manufacturing the color filter, it is difficult for the ink to uniformly spread to the outer edge portion of the ink droplet indicated by the arrow a in the drawing of the section A and the corner of the section, and pixels having uneven ink are generated among many pixels. There was something.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and provides a method of manufacturing a color filter capable of uniformly adhering a plurality of pixel material droplets to each of a large number of sections formed by a black matrix. The purpose is to provide.

[0005]

According to the present invention, in order to achieve the above object, a pixel material droplet is adhered to a section formed by a black matrix on a transparent substrate to form a color filter for forming a predetermined color pattern. In the manufacturing method, another pixel material droplet of the same color is adhered while overlapping, before the previously deposited pixel material droplet dries.

When another pixel material droplet of the same color is adhered to the partition formed by the black matrix while the pixel material droplet is being dried before the pixel material droplet dries, the surface tension of the overlapped pixel material droplets causes the partition. Spread evenly inside.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to FIGS. FIG. 1 is a schematic diagram illustrating the principle of the ink jet method used in the method for manufacturing a color filter of the present invention. The piezoelectric element 1 divides the continuously ejected ink by vibrating the nozzle 2 to form an ink droplet DI. The charging electrode 3 applies a predetermined charge to the passing ink droplet DI by a pulse voltage applied based on a print information signal. On the other hand, the ink droplet DI charged by the charging electrode 3 has its flight path deflected by a set of deflecting electrodes 4 according to the charge level, and has a large number of partitions formed by a black matrix 7 on a transparent substrate 5. Attaches to desired compartments inside. The ink droplets that have not adhered to the transparent substrate 5 are collected in the gutter 6. here,
Since FIG. 1 is a schematic diagram, the black matrix 7 does not match the actual shape.

Therefore, the color filter ejects ink droplets DI of red, green, and blue colors from the respective nozzles 2 and divides the ink droplets DI into a large number of sections formed by the black matrix 7 on the transparent substrate 5 in a predetermined arrangement order. Then, after performing various processes such as temporary curing and main curing to form a pixel, it is manufactured through a process of forming a protective film, a transparent electrode and the like. In the method of the present invention, a plurality of ink droplets to be adhered to each section are formed before each drop is dried, as shown in FIG. It is characterized by being attached.
Normally, the ink droplets DI used in the ink-jet method have an evaporation component (solvent) of 50% or more (80 to 95% is good). For this reason, as shown in FIG. 3, the ink I in the section A is in a state of rising from the black matrix 7 due to the surface tension. Therefore, each section A
In this case, the attached ink droplets DI spread evenly and uniformly due to the mutual surface tension of the overlapping ink droplets DI.

On the other hand, when the black matrix is formed according to the following embodiment, for example, the contact angle between the black matrix 7 and the ink I in FIG. 3 becomes larger, and the effect of the partition wall can be obtained. This makes it possible to spread the overlapping ink droplets DI to the corners of the sections and at the same time prevent the ink drops from flowing into the adjacent sections.

Example 1 First, a black matrix was formed on a glass substrate according to the procedure disclosed in Japanese Patent Application No. 5-182760 described below. That is, a 0.2% by weight solution of N-trimethoxysilylpropyl polyethyleneimine (PS076, manufactured by Chisso Corporation) in ethanol was prepared as a primer solution. This was applied on a washed and dried glass substrate with a spinner at 1,500 rpm for 10 seconds and then dried at 150 ° C. for 10 minutes to form an adhesive layer.

Next, a photocurable black photosensitive resin solution having the following composition was applied thereon with a spinner at 500 rpm for 2 seconds and then at 1,000 rpm for 10 seconds.
For 15 minutes for pretreatment. [Black photosensitive resin solution] A polymer obtained by adding glycidyl methacrylate to a three-dimensional acrylic copolymer composed of styrene / methyl methacrylate / methacrylic acid (3: 3: 4 (copolymerization ratio)) 8.35 parts by weight trimethylol Propane triacrylate 3.00 parts by weight Epoxy acrylate 2.00 parts by weight "Irgacure" 369 (manufactured by Ciba-Geigy) 0.59 parts by weight "Irgacure" 907 (manufactured by Ciba-Geigy) 0.59 parts by weight trithiophosphite 0.39 parts by weight Part "Carbon black" MA100 (manufactured by Mitsubishi Kasei Co., Ltd.) 4.03 parts by weight Fluorinated surfactant "EFTOP" EF-123A-1 (manufactured by Tochem Products) 0.70 parts by weight fluorinated interface Activator "MRGAFAC" F-179 (manufactured by Dainippon Ink and Chemicals, Inc.) 3.50 parts by weight 2-butoxyethanol 76.85 parts by weight

Next, a predetermined pattern mask corresponding to a black matrix is vacuum-contacted on the glass substrate, exposed at 210 mJ / cm 2 using a chemical lamp, and developed with a 0.125% aqueous solution of 2-aminoethanol. Followed by 150 ° C
And heat-treated for 30 minutes to remove the black photosensitive resin in the exposed area.
It was a 1.5 μm layer. Through the above operation, a black matrix made of a light-shielding black resin having a function of an ink-repellent partition wall was formed on the glass substrate.

After the black matrix is formed on the glass substrate as described above, ink droplets DI of each color of red, green, and blue are applied to a predetermined number of sections formed by the black matrix by the above-described ink jet method. In the order of the sequence. Thereafter, the glass substrate is heated at 150 ° C. for 20 minutes.
After heating for each minute to heat and cure each color ink to form pixels, a color filter was manufactured through a process of forming a protective film, a transparent electrode, and the like.

In the obtained color filter, each color 5
For 0 pixel, when the film thickness of the ink of each color cured by heating was measured by a stylus type film thickness meter, the film thickness was 1.5 μm on average,
The difference in film thickness was 0.1 μm at the maximum, and color unevenness was measured by a microspectrometer. The color difference was ΔE ≦ 3, and a high-quality color filter in which the ink of each color adhered uniformly to all corners was obtained. I understood that.

Here, in the above embodiment, the black matrix having the function of the ink repelling partition wall is formed on the glass substrate.
As disclosed in the specification of JP-A-55-55, an ink-repellent blocking fence may be further formed on the black matrix to prevent the ink from flowing out.

[0016]

As is apparent from the above description, according to the present invention, there is provided a method of manufacturing a color filter capable of uniformly adhering a pixel material droplet to a section formed by a black matrix, and achieving high quality. Can be manufactured.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating the principle of an ink jet method used in a method for manufacturing a color filter of the present invention.

FIG. 2 is a plan view showing a method of the present invention for applying a pixel material droplet to a section formed by a black matrix.

FIG. 3 is a sectional view of a section shown in FIG. 2;

FIG. 4 is a plan view showing a conventional method for attaching a pixel material droplet to a section formed by a black matrix.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Piezoelectric element 2 Nozzle 3 Charging electrode 4 Deflection electrode 5 Transparent substrate 6 Gutter 7 Black matrix DI Ink droplet

Claims (1)

[Claims] 1. A method of manufacturing a color filter for forming a predetermined color pattern by depositing pixel material drops on a section formed by a black matrix on a transparent substrate, wherein the previously deposited pixel material drops are dried. A method for manufacturing a color filter, comprising: attaching another pixel material droplet of the same color while overlapping the pixel material droplets before overlapping.