JPS62191804A - Method for retouching color filter - Google Patents

Abstract

PURPOSE:To retouching the titled filter by removing a foreign matter sticked to or contained in the color filter which is dyed with a dyestuff or a pigment together with a substance constituting the film near the foreign matter by irradiating a laser ray having <=1mum wavelength. CONSTITUTION:The foreign matter 4 presents on the color filter 5 positioned a side of the transparent substrate 1 and is covered with an epoxy resin 2. The foreign matter 4 contd. in the titled filter is irradiated through a pore slit with the second harmonic wave of YAG raser light, 532nm. When irradiating the laser ray with <=10<-9>sec pulse at 1-2 times, any kinds foreign matter is evaporated and removed collectively. The org. color filter is produced by laminating a transparent electrode 3 by means of a sputtering method after retouching the filter. The display device which is operated in good order is formed by sealing a liquid crystal in the obtd. filter.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a method for repairing a color filter made of dyeable resin colored with a coloring agent. Concerning suitable methods for modifying filters.

(Prior art) In a liquid crystal display device, a gap of about 1 μm to 10 μm is provided between two transparent substrates such as glass plates on which transparent electrodes are formed, liquid crystal is sealed, and a voltage is applied between the electrodes. It is used to drive and display images. In order to display in color,
It is common to provide color filters of multiple colors at any position between the gears.

(Problems to be Solved by the Invention) When forming a transparent electrode on a color filter in a liquid crystal display device, several μ
When foreign matter such as dust with a size of 100 μm to several tens of μm is attached or included, the upper and lower electrodes (sometimes metal electrodes) are often short-circuited and the display quality is degraded. Even if there is an electrode under the color filter, if the dust is conductive or has a high dielectric constant, the display quality will be degraded.

However, as a practical matter, even in environments with little dust, such as clean rooms, when color filters are manufactured using dyeing or printing methods, it is impossible to completely avoid dust adhesion and inclusion.

Incidentally, there are various types of foreign matter that adhere to or are included in color filters, such as dust, metal pieces, and cured photosensitive resin gels, and there are many types of foreign matter that can be referred to as dust. When irradiating such a variety of foreign objects with laser light of a specific wavelength, some types of foreign objects may be evaporated and removed, but other types of foreign objects may only be penetrated by the laser light. All (There was a problem that it could not be removed.

(Means for Solving the Problems) That is, one aspect of the present invention is a method for repairing a color filter formed by coloring a dyeable resin with a colorant.

This color filter repair method is characterized in that foreign matter attached to or included in the color filter is removed together with color filter constituent materials in the vicinity of the foreign matter by irradiating laser light with a wavelength of 1 micron or less.

The main purpose of the present invention is to remove various foreign substances together with color filter constituent materials near the foreign substances in order to remove various foreign substances at once.

Color filters made of dyeable resin colored with colorants have low light absorption (high transmittance) on the long wavelength side, especially in the infrared region of 1 micron or more, and have poor thermal conversion efficiency of light energy from long wavelength lasers. . Therefore, in order to remove the substances constituting the color filter, it is effective to irradiate the color filter with laser light in the visible or ultraviolet region, where the light absorption rate of the substances constituting the color filter is high. Specifically, YAG (
5 32 nm, which is the second high frequency of the solid-state) laser,
488 nm, which is an Ar+ Yani+ ion laser;
515nnn-647nm, 694 of ruby laser light
nm or excimer laser can be used.

Regarding the materials of the color filter that can be applied to the present invention, dyeable resins include natural resins with excellent dyeing properties such as gelatin, low molecular weight gelatin, casein, and gris, as well as polyvinyl alcohol, polyimide,
Examples include synthetic resins such as acrylic acid resin. Examples of colorants include dyes and pigments. Furthermore, methods for producing color filters include a printing method and a dyeing method using photolithography.

(Function) The present invention removes various foreign substances attached to or included in the color filter by evaporating the color filter in the vicinity thereof.

Regardless of the type of foreign matter, it can be removed all at once.

The present invention will be explained in detail along with examples.

[Example 1] Figure 1 shows a color filter (5) formed by printing.
FIG. 2 is a schematic cross-sectional view of an electrode plate. An overcoat H2+ for smoothing is formed using epoxy resin on the color filter (5) formed on one side of the transparent substrate (1), and a part of the color filter (5) is covered with foreign matter (4). This shows that protrusions are formed.

In order to remove the protrusions caused by the foreign matter (4), a second high frequency wave of 532 nm from a YAG laser is used to remove the foreign matter (5) in the color filter (5) through a 20 micron square hole slit.
4) was irradiated with laser light. Pulse 1 of 10 seconds or less
The protrusion caused by the foreign object (4) could be removed after ~2 times.

After correction with laser light, a transparent electrode (3) was laminated using a sputtering device to obtain the organic color filter shown in FIG. 2. A liquid crystal display device with liquid crystal sealed in it was created using this color filter, and defects caused by short circuits between the upper and lower electrodes were investigated, but no abnormalities were found.

〔Example〕

FIG. 3 is a schematic cross-sectional view of an electrode plate having a color filter (151) formed by a dyeing method on one side of a transparent substrate.Protrusions due to foreign matter 04 are formed on a part of the color filter α.Implementation As in Example 1, using the second high frequency 532 nm YAC laser, removal and modification were performed as shown in FIG. Thereafter, as shown in FIG. 5, a transparent electrode u31 was laminated and patterned. A liquid crystal was sealed using this electrode plate with a color filter, and time-division driving was performed, and extremely good display quality was obtained.

(Effects of the Invention) Conventionally, when an electrode plate with a color filter containing protrusions caused by foreign matter with a height of several μm to several tens of μm was used in a liquid crystal display, the upper and lower electrodes would short-circuit, impairing display quality. 1. By carrying out the modification according to the present invention, tall protrusions can be removed all at once regardless of the type of foreign matter, so this drawback can be overcome. Furthermore, this modification has the effect of significantly improving the yield of color filters.

In the present invention, an overcoat and a protective layer for smoothing may be applied after correction with laser light.

[Brief explanation of drawings]

1 and 2 are schematic cross-sectional views showing one embodiment of the correction method of the present invention, and FIGS. 3, 4, and 5 are schematic sectional views showing other embodiments of the correction method of the present invention. FIG.

Claims (1)

[Claims] 1) A method for repairing a color filter made by coloring a dyeable resin with a colorant, in which foreign matter attached to or contained in the color filter is irradiated with a laser beam having a wavelength of 1 μm or less. A method for correcting a color filter, characterized in that foreign matter is removed together with color filter constituent substances near the foreign matter. 2) The method for modifying a color filter according to claim 1, wherein the colorant is a dye. 3) The method for modifying a color filter according to claim 1, wherein the colorant is a pigment.