JPH0973010A - Production of color filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to adhere plural pixel material drops uniformly to each of many blocks by adhering these plural pixel material drops to these pixels while overlapping the drops before the respective drops dry. SOLUTION: The color filters are formed by injecting the ink drops DI of respective colors; red, green and blue, from respective nozzles 2 and adhering the ink drops in prescribed arrangement order to the many blocks A formed by a black matrix 7 on a transparent substrate 7. The drops are subjected to respective treatments including tentative curing, normal curing, etc., to form the pixels; therefore, protective films, transparent electrodes, etc., are formed. At this time, the plural ink drops DI to be adhered to the blocks A are adhered while the ink drops are overlapped in, for example, the longitudinal direction within the blocks A before the drops dry. The adhered ink drops DI are spread uniformly by the surface tension of the overlapped ink drops DI with each other within the blocks A.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method for manufacturing a color filter.

[0002]

2. Description of the Related Art In the manufacture of a color filter, an ink jet method is a preferable method because ink drops 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 of manufacturing a color filter is disclosed.

[0003]

By the way, in a color filter, for example, a color filter for a TFT liquid crystal display panel, the shape of the pixel is not simple due to the arrangement of the driving transistor, and one rectangular corner is notched. It has a broken shape. Usually, when manufacturing a color filter, a predetermined number of ink droplets are applied to each section formed by the black matrix, for example, as shown in FIG. At this time, the ink droplet DI applied to each section A spreads in a circle. For this reason, in the production of the color filter, it is difficult for the ink to uniformly spread to the outer edge portion of the ink droplet of the section A indicated by the arrow a in the drawing and the corners of the section, and a large number of pixels with uneven ink occurs. There was an occasion.

The present invention has been made in view of the above points, and provides a method of manufacturing a color filter capable of uniformly attaching 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 plurality of pixel material droplets are attached to each of a large number of sections formed by a black matrix on a transparent substrate, and a predetermined color pattern is formed. A method of manufacturing a color filter, wherein a plurality of pixel material droplets attached to each of the sections are attached while overlapping before each droplet dries.

When a plurality of pixel material droplets are adhered to the partition formed by the black matrix while overlapping each other before drying, the surface tension of the overlapping pixel material drops causes unevenness in the partition. Not evenly spread.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described in detail below with reference to FIGS. FIG. 1 is a schematic diagram illustrating the principle of the inkjet method used in the method for manufacturing a color filter of the present invention. The piezoelectric element 1 vibrates the nozzle 2 to break up the ink that is continuously ejected and divides it into ink droplets DI. The charging electrode 3 imparts a predetermined charge to the ink droplets DI that pass by the pulse voltage applied based on the print information signal. On the other hand, the ink droplet DI charged with the charge electrode 3 has its flight path deflected according to the charge level by a set of deflection electrodes 4, and a large number of sections formed by the black matrix 7 on the transparent substrate 5. Attach to desired compartments inside. 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 causes the ink droplets DI of red, green and blue to be ejected from the respective nozzles 2 and is arranged in a predetermined order in a large number of sections formed by the black matrix 7 on the transparent substrate 5. After being attached and subjected to various treatments 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 compartment are dried in each compartment A, for example, while overlapping in the longitudinal direction, as shown in FIG. It is characterized by being attached.
In general, the ink droplet DI used in the inkjet method has an evaporation component (solvent) of 50% or more (80 to 95% is good). Therefore, 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 the above, due to the mutual surface tension of the overlapping ink drops DI, the adhered ink drops DI are evenly distributed.

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 can prevent the overlapping ink droplets DI from spreading to the corners of the compartments and at the same time prevent the ink droplets from flowing into the adjacent compartments. 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 wt% ethanol solution of N-trimethoxysilylpropyl polyethyleneimine (PS076, manufactured by Chisso Corporation) was prepared as a primer solution. Spin this on a washed and dried glass substrate with a spinner.
After applying at 500 rpm for 10 seconds, it was dried at 150 ° C. for 10 minutes to form an adhesive layer. Next, a photocurable black photosensitive resin solution having the following composition was spinned on the spinner at a rotation speed of 500.
The coating was applied under rpm for 2 seconds and then at 1,000 rpm for 10 seconds, and then heated at 80 ° C. for 15 minutes for pretreatment. [Black photosensitive resin solution] Polymer in which glycidyl methacrylate was added to a three-dimensional acrylic copolymer consisting 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 Fluorosurfactant "EFTOP" EF-123A-1 (manufactured by Tochem Products Co., Ltd.) 0.70 parts by weight Fluorine-based 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, Black Mat A predetermined pattern mask corresponding to the lix was vacuum-contacted on the glass substrate, exposed with a chemical lamp at 210 mJ / cm ² , and then 2-aminoethanol 0.
Development was carried out with a 125% aqueous solution, followed by heat treatment at 150 ° C. for 30 minutes to form a black photosensitive resin in the exposed area into a layer having a thickness of 1.5 μm.

By the above operation, a black matrix made of a black resin for light shielding having a function of an ink-repellent partition wall was formed on the glass substrate. After forming the black matrix on the glass substrate as described above,
The red, green, and blue ink drops DI were deposited in a predetermined arrangement order in a large number of sections formed by the black matrix by the inkjet method.

Then, the glass substrate was heated at 150 ° C. for 20 minutes to heat-cure each color ink to form a pixel, and then a color filter was manufactured through a process of forming a protective film, a transparent electrode and the like. In the obtained color filter,
For 50 pixels of each color, the film thickness of the ink of each color heat-cured was measured with a stylus type film thickness meter, and the film thickness was 1.5 on average.
μm, the film thickness difference is 0.1 μm at maximum, and the color difference is ΔE ≦ 3 when the color unevenness is measured with a microspectroscope, and a high-quality color filter in which each color ink is evenly attached to every corner is obtained. I understood that it was done.

Here, in the above embodiment, the black matrix having the function of the ink-repellent partition wall was formed on the glass substrate. For example, Japanese Patent Application No. 6-1667.
As disclosed in Japanese Patent No. 55, an ink-repellent blocking barrier for blocking the outflow of ink may be further formed on the black matrix.

[0014]

As is apparent from the above description, according to the present invention, 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. A method is provided that can produce high quality color filters.

[Brief description of drawings]

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

FIG. 2 is a plan view showing the method of the present invention for depositing a drop of pixel material in the compartment formed by the black matrix.

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

FIG. 4 is a plan view showing a conventional method of depositing a pixel material drop on a section formed by a black matrix.

[Explanation of symbols]

 1 Piezoelectric Element 2 Nozzle 3 Charging Electrode 4 Deflection Electrode 5 Transparent Substrate 6 Gutter 7 Black Matrix DI Ink Drop

Claims (1)

[Claims] 1. A method of manufacturing a color filter, comprising forming a predetermined color pattern by depositing a plurality of pixel material droplets on each of a large number of sections formed by a black matrix on a transparent substrate. A method for manufacturing a color filter, wherein a plurality of pixel material droplets to be attached are attached while overlapping each other before the droplets are dried.