JPH05303015A - Color filter - Google Patents

Abstract

PURPOSE:To decrease deposition of particles on a light-shielding film due to electrostatic charges and to improve production yield by forming the light- shielding film to be extended to a nondisplay area on a transparent substrate. CONSTITUTION:The light-shielding film 10 consisting of metal chromium or the like is formed in a display area 9 of a transparent substrate 8 by vacuum vapor deposition or sputtering. The light-shielding film 10 is formed in grid shape so that each grid section corresponds to a picture element. During the light-shielding film 10 is formed by vacuum vapor depostion, sputtering, etc., a conductive film 12 is simultaneously formed in a manner that the light- shielding film 10 is extended to the nondisplay area 11. Therefore, the conductive film 12 is electrically connected to the light-shielding film 10. Then, for example, a photosensitive resin having dispersion of red pigment is applied on the whole surface of the substrate by printing or spin coating and exposed through a mask to form red picture elements 15. This process is repeated for green and blue picture elements to form green picture elements 16 and blue picture elements 17.

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 color liquid crystal display device or the like.

[0002]

2. Description of the Related Art A color liquid crystal display device using a color filter has been proposed. In this color liquid crystal display device, a photosensitive coloring resin containing pigments such as red, green and blue is applied on a transparent substrate. It is manufactured by a technique of forming fine color filters in a lattice shape by a photolithography technique, and this technique is usually called a "pigment dispersion method".

A color filter relating to this color liquid crystal display device will be described with reference to FIGS.

In FIG. 7, reference numeral 1 is a transparent substrate made of glass or the like, and a light shielding film 2 made of metallic chromium or the like is formed on the transparent substrate 1 by vacuum deposition or sputtering. This light-shielding film 2
Are formed in a grid shape, and each grid corresponds to an individual pixel.

Next, as shown in FIG. 8, for example, a photosensitive resin 3 in which a red pigment is dispersed is applied to the entire surface by printing or spin coating, and exposed through a mask 4. Then, as shown in FIG. Is formed.

Further, by repeating this process for other pixels of green and blue, respectively, a green pixel 6 and a blue pixel 7 are formed as shown in FIG.

[0007]

However, in the case of the color filter proposed above, the light shielding film 2 is formed on the transparent substrate 1.
When the matrix is formed, the transparent substrate 1
Was found to be charged to 100 V to 200 V, for example.

Regarding the charging of such a transparent substrate 1,
When the transparent substrate 1 is washed with pure water by spraying, a step of blowing off the water droplets with dry air is included for drying after the washing, and it is considered that static electricity is generated in this drying step.

Therefore, it was found that various particles adhere to the light-shielding film 2 due to such static electricity. This particle is dust in a clean room,
Organic dust includes sebum and clothing from the human body,
There are resins, etc. used in the process, and silicates, carbonates, various oxides that enter from the outside into the inorganic dust,
There is metal powder, etc. Then, when the particles adhere to the light-shielding film 2 in this way and the particles are large in size,
Even if the photosensitive resin 3 is subsequently applied to form the pixels 5, 6 and 7, the characteristics such as color purity and brightness of the color filter are deteriorated due to the inclusion of particles in each pixel area. There is a problem.

[0010]

In the color filter of the present invention, a color filter of a photosensitive coloring resin is adhered to a non-film-forming region of a light-shielding film formed in a predetermined pattern on a transparent substrate to form a display region. And the light-shielding film is extended in the non-display area on the transparent substrate.

[0011]

In the color filter having the above structure, the light-shielding film is extended in the non-display area on the transparent substrate, which reduces the amount of charge due to static electricity in the display area. Adhesion to the light-shielding film can be reduced and the manufacturing yield can be increased.

[0012]

EXAMPLES Examples of the present invention will be described below.

FIG. 1 is a plan view of a transparent substrate 8 such as glass, and FIG. 2 is a sectional view taken along line XX in FIG. The transparent substrate 8 is used after being thoroughly washed and removing the alkaline components and oils deposited on the surface. In the display area 9 of the transparent substrate 8, a light-shielding film 10 made of metallic chromium or the like is formed by vacuum vapor deposition, sputtering or the like. The light-shielding film 10 is formed in a lattice shape, and each lattice corresponds to an individual pixel. The line-width of the light-shielding film 10 is, for example, 3 to 20 μm, and the thickness is 0.
It is 1 to 0.3 μm. Then, when the light shielding film 10 is formed by vacuum vapor deposition, sputtering, or the like, at the same time, the conductive film 12 is formed so that the light shielding film 10 extends in the non-display area 11. Therefore, the conductive film 12 is the light-shielding film 1.
It is electrically connected to 0.

Next, as shown in FIG. 3, a photosensitive resin 13 in which, for example, a red pigment is dispersed is applied to the entire surface by printing or spin coating, and exposed through a mask 14. As shown in FIG. Is formed.

By repeating this process for other pixels of green and blue, respectively, a green pixel 16 and a blue pixel 17 are formed as shown in FIG.

Thereafter, as shown in FIG. 6, an overcoat layer 18 is formed by coating a transparent resin such as epoxy resin or acrylic resin, and the surface of each pixel 15, 16, 17 is smoothed. Then, a transparent electrode 19 made of indium tin oxide or the like is formed on the overcoat layer 18 by vacuum vapor deposition, sputtering, or the like, whereby a liquid crystal layer (not shown) is controlled and each pixel 15, 16, The display corresponding to 17 is performed.

Thus, in the color filter having the above structure, since the conductive film 12 that is electrically connected to the light shielding film 10 is formed, the charge amount due to the static electricity in the display area is reduced, and as a result, the static electricity is reduced. Conductive film 12 of particles
Can be reduced and the manufacturing yield can be increased.

In the case of the present invention, the conductive film 12 is used.
It is more advantageous to ground the display area because the display area is not charged and particles do not adhere.

The present invention is not limited to the above embodiments, and various modifications and improvements can be made without departing from the scope of the present invention. For example, although the pigment dispersion method is used in this embodiment, the same applies to other dyeing methods, printing methods and the like.

Further, the conductive film formed by extending the light-shielding film on the non-display area on the transparent substrate may be the entire non-display area, or various patterns can be formed if necessary.

[0021]

As described above, according to the color filter of the present invention, the color filter of the photosensitive coloring resin is applied to the non-film-forming region of the light-shielding film formed in a predetermined pattern on the transparent substrate. By forming the display area and extending the light-shielding film to the non-display area on this transparent substrate, the amount of charge due to static electricity in the display area is reduced, and as a result, the particles adhere to the light-shielding film due to static electricity. Can be reduced and the manufacturing yield can be increased.

[Brief description of drawings]

FIG. 1 is a plan view of a transparent substrate in an example.

FIG. 2 is a sectional view taken along line XX of the transparent substrate of FIG.

FIG. 3 is a cross-sectional view of a photoresist-formed substrate in an example.

FIG. 4 is a cross-sectional view at the time of forming pixels in the example.

FIG. 5 is a cross-sectional view after forming a color filter in an example.

FIG. 6 is a cross-sectional view of a liquid crystal display color filter in an example.

FIG. 7 is a cross-sectional view of a conventional transparent substrate on which a light shielding film is formed.

FIG. 8 is a cross-sectional view of a photoresist formation substrate in a conventional example.

FIG. 9 is a cross-sectional view at the time of forming pixels in a conventional example.

FIG. 10 is a cross-sectional view after forming a color filter in a conventional example.

[Explanation of symbols]

 1, 8 Transparent substrate 2, 10 Light-shielding film 3, 13 Photosensitive resin 4, 14 Mask 5, 6, 7, 15, 16, 17 Pixel 9 Display area 11 Non-display area 12 Conductive film

Claims (1)

[Claims] 1. A display area is formed by applying a color filter of a photosensitive coloring resin to a non-film-forming area of a light-shielding film formed in a predetermined pattern on a transparent substrate, and a non-display on the transparent substrate. A color filter comprising the light-shielding film extending in a region.