JPH08136720A - Production of color filter - Google Patents

Abstract

PURPOSE: To provide a producing method for color filter by an inexpensive BM forming. CONSTITUTION: In this producing method for color filter in which a black matrix 1, a colored picture element 3 and an overcoat film 4 are formed on a transparent substrate such as a transparent plastic or glass substrate 2, the black matrix 1 is formed by using an electroless plating liq. in which an inorg. salts and an org. compd. having O, N and S are added as additive.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a color filter used in a color liquid crystal display device.

[0002]

2. Description of the Related Art Liquid crystal display (hereinafter abbreviated as LCD)
Taking advantage of its thinness, small size, and low power consumption, is currently used for display parts of watches, calculators, TVs, personal computers and the like. Furthermore, in recent years, color LCDs have been developed and OA / AV
It has begun to be used in many applications such as navigation systems and viewfinders mainly for devices, and the market is expected to expand rapidly in the future.

A color filter for displaying an LCD in color is R (red) on a substrate 2 such as a glass plate on which a BM (black matrix) 1 having a grid pattern is formed.
Color pixel 3 consisting of G (green) and B (blue) (approximately 100 x 1
(00 × 2 μm), and a transparent overcoat layer (OC) 4 is formed thereon. Reference numeral 5 is a polarizing plate, and 6 is an ITO electrode.

A color LCD has a color filter 7 as an LC.
The display screen can be colored by being installed inside D and transmitting the backlight light to the color filter. 8 is an alignment film, 9 is a liquid crystal, 10 is a seal material, 11 is a top coat layer, 12 is an ITO electrode, 13 is a substrate such as a glass plate, 14
Is a polarizing plate.

At present, color filters are mainly manufactured by the dyeing method. However, in this method, it is necessary to repeat the process of applying a transparent photosensitive resin on a glass substrate, forming pixels by drying, exposing and developing, dyeing with a dye, and then forming a color mixing prevention layer three times. Therefore, the number of steps is large and the cost is high. Further, since a dye is used as a colorant, there is a drawback that the reliability (weather resistance / heat resistance), which is an important subject of the color filter, is deteriorated.
Therefore, some color filters using a pigment as a colorant have been proposed, and among them, there are an electrodeposition method, a printing method, and a photolithography method (photolithography method).

However, the electrodeposition method requires the formation of an electrode pattern (1) the degree of freedom of the pattern is small,
(2) The cost is high, and the printing method has problems that (1) it is difficult to align a large-sized substrate and the resolution is low, so it is difficult to miniaturize, and (2) the flatness of the pattern is poor. The photolithography method is considered to be the mainstream. A liquid resist and a film are considered for the photolithography method. In the liquid resist, color pixels are formed by applying a varnish in which a pigment is dispersed in a photosensitive resin on a glass substrate with a spinner, drying, exposing, and developing. On the other hand, the film is a varnish formed into a film like the photosensitive film for printed boards, and after being laminated on a substrate, color pixels are formed by exposure and development.

[0007]

For the black matrix (BM) of the color filter, a vapor deposition film of low reflection type chromium oxide or the like is being used from conventional Cr, but there is a problem that it is expensive. The present invention provides a color filter formed by BM, which has low reflection and wet plating, and thus is inexpensive.

[0008]

The present invention is a method of manufacturing a color filter in which a black matrix, colored pixels, and an overcoat film are formed on a transparent substrate such as a transparent plastic or glass substrate, and the black matrix is not used. It is characterized by being formed by electrolytic copper oxide plating.

In the electroless copper oxide plating method, an inorganic salt or an organic compound containing O, N, S is used as an additive. As the organic compound, 100 mg / liter of 1,10-phenanthroline (C12H8N2) is added, for example. As a plating solution, 10 g of copper sulfate and EDTA
(Na salt) 365 g, 37% formalin 3.6 ml, p
H12.3,1,10-phenanthroline (C12H8
N2) 100 mg is used. The obtained coating was grayish black and the result of ESCA analysis was Cu2O and CuO.
It was a mixture with.

As a patterning (BM formation) method,
Catalysts normally used for glass substrates (Hitachi Kasei HS-10
1) is applied to the entire surface, and plating is performed on the entire surface of the substrate using the above-mentioned plating solution at 70 ° C. Then, a positive resist is spin-coated and then patterned to remove unnecessary portions of copper oxide with an acid (for example, 1
Etch with 0% H2SO4). After that, the entire surface is exposed to remove the resist.

[0011]

According to the present invention, it is possible to manufacture an inexpensive color filter by BM formation because it has low reflection and wet plating.

[Brief description of drawings]

FIG. 1 is a sectional view of a liquid crystal display.

[Explanation of symbols]

 1. BM (black matrix) 2. Glass substrate 3. Color pixel 4. Overcoat layer (OC) 5. Polarizing plate 6. ITO electrode 7. Color filter 8. Alignment film 9. Liquid crystal 10. Seal material 11. Top coat layer 12. ITO electrode 13. Glass substrate 14. Polarizer

Claims (1)

[Claims] 1. A black matrix on a transparent substrate,
A method for producing a color filter for forming colored pixels and an overcoat film, wherein the black matrix is formed by electroless copper oxide plating.