JPH08171007A - Production of color filter - Google Patents

Abstract

PURPOSE: To form an over coat layer (OC) with excellent workability at a low cost by laminating a translucent protective film by film type transfer method. CONSTITUTION: In a producing method of a color filter formed by laminating a colored picture element film 3 having plural colors and a translucent protective film 4 on a transparent substrate 2, the translucent protective film 4 is laminated by film type transfer method. That is, the OC layer 4 is laminated by the film type transfer method by laminating a resin film composed of a base film and an OC resin layer on the substrate so that the OC resin layer faces the substrate 2 and stripping the base film. In this case, the resin film to be used is obtained by applying a resin composition for the OC on a strippable base film such as a film of polyethylene terephthalate and drying to form the OC resin layer.

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 formation of the OC film, a method of applying a solution of a resin composition and drying it is used. However, this method has a problem in working environment that a solvent or the like is volatilized when a solution of a resin composition is applied and dried, and has a drawback that workability is poor such as requiring a special device. In addition, there is a drawback in that the efficiency of using the solution of the resin composition at the time of application is poor, and the cost is increased accordingly. The present invention provides a method of manufacturing a color filter which has good workability and can form an OC at low cost.

[0008]

The present invention relates to a method of manufacturing a color filter in which a color pixel film of a plurality of colors and a transparent protective film are laminated on a transparent substrate, and the transparent protective film is formed into a film. It is characterized in that the layers are laminated by a transfer method. INDUSTRIAL APPLICABILITY The present invention, when forming an OC, uses a resin film consisting of a base film and a resin layer to be transferred, which is generally used as an etching resist, a plating resist, a solder resist, etc. at the time of manufacturing a printed wiring board. Since the waste of the resin composition is reduced and the mixture of foreign matters into the color filter is reduced, the yield is improved, the cost of manufacturing the color filter is reduced, and the driver IC is mounted by limiting the transfer area. It was made possible by finding that the OC film is not applied to the tab portion that is formed, and that it can also prevent the wraparound to the back surface. That is, according to the present invention, OC is laminated on a transparent substrate by a film transfer method in which a resin film composed of a base film and an OC resin layer is attached so that the OC resin layer faces the substrate, and the base film is peeled off. It is a method for producing a color filter.

The resin film used in the present invention is obtained by applying a resin composition for OC onto a peelable base film such as polyethylene terephthalate and drying it to form an OC resin layer. Since this OC resin layer is uncured, flexible and adhesive,
It is preferable that a protective film such as a polyethylene film is further attached onto the OC resin layer to prevent external damage, adhesion of foreign matter, and the like. The OC resin layer formed on the resin film is stuck on the transparent substrate while peeling off the protective film, and the base film on the surface of the OC resin layer is removed later. The thickness of the OC resin layer is preferably 0.5 μm to 30 μm. The color pixel film is preferably formed by a film transfer photolithography method.

[0010]

Example: An epoxy resin solution, which is a resin for OC manufactured by Hitachi Chemical Co., Ltd., was applied on a polyethylene terephthalate film having a thickness of 25 μm to a uniform thickness, and dried on a hot plate at 80 ° C. for 2 minutes, A 30 μm-thick polyethylene film was attached as a protective film to obtain a resin film. The thickness of the OC resin layer after drying was 3 μm. Next, a glass plate having a thickness of 1.1 mm was kept at 80 ° C., and while peeling off the protective film of the OC resin film, OC was formed on the glass plate on which the pixel films of a plurality of colors were formed by covering the tab portions with a metal mask. Roll the resin layer to 100
Lamination was carried out at a temperature of 4 ° C., a roll pressure of 4 kg / cm 2, and a speed of 1.5 m / min. Then, the polyethylene terephthalate film was removed and heated at 200 ° C. for 1 hour. The obtained color filter had no OC backing, and the tab portion was not covered with the OC film.

[0011]

INDUSTRIAL APPLICABILITY In the present invention, the waste of the OC resin composition is reduced, and the mixing of foreign matters into the color filter is reduced, so that the yield is improved and, as a result, the cost for manufacturing the color filter is reduced. Further, by limiting the transfer area, it is possible to prevent the OC film from being applied to the tab portion on which the driver IC is mounted and to prevent the OC film from wrapping around to the back surface.

[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

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Hideyuki Hashimoto, Inventor 48, Wadai, Tsukuba, Ibaraki Hitachi Chemical Co., Ltd. Tsukuba Development Laboratory (72) Inventor Nobuaki Takane 48, Wadai, Tsukuba, Ibaraki Hitachi Chemical Incorporated company Tsukuba R & D Laboratory (72) Inventor Ken Yoshida 48 Wadai, Tsukuba, Ibaraki Prefecture Hitachi Chemical Co., Ltd. Tsukuba R & D Laboratory

Claims (1)

[Claims] 1. In a method of manufacturing a color filter in which a color pixel film of a plurality of colors and a light-transmitting protective film are laminated on a transparent substrate, the light-transmitting protective film is laminated by a film transfer method. Characteristic color filter manufacturing method.