JPH08136712A - Production of color filter - Google Patents

Abstract

PURPOSE: To produce a color filter which has no transfer failure of a colored film by transferring a dry film by using a laminator roll having the rubber hardness of less than a specified value. CONSTITUTION: A colored picture is formed by a transferring stage in which the colored picture is transferred by using a photosensitive dry film consisting of a base film and a photosensitive resin colored in one color on a transparent substrate such as transparent plastic or glass substrate 2 and a pattern forming stage on the photosensitive resin by a photolithographic method. That is, for example, a colored pattern of the first color is formed by laminating the red photosensitive resin layer on the glass substrate 2 having previously formed black matrix of a Cr thin film by using a red dry film in which a colored photosensitive resin soln. consisting of a prescribed composition is made into film, moreover, the second color and the third color are formed by using blue and green dry film in the same method. In this case, the dry film is transferred by using a laminator roll having <=50IRHD rubber hardness.

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 the problems that (1) it is difficult to align a large-sized substrate and the resolution is low, so that 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]

When a dry film is transferred onto a substrate, a laminator roll having a rubber hardness of 70 IRHD or more has been conventionally used. However, in this laminator roll, when unevenness exists on the substrate as in the case of the second and subsequent colors, the photosensitive resin did not sufficiently enter into these unevenness, causing transfer failure. The present invention provides a method for producing a color filter without transfer defects.

[0008]

According to the present invention, a transparent substrate such as a transparent plastic or glass substrate is transferred onto a transparent substrate using a base film and a photosensitive dry film made of a photosensitive resin colored in one color. In the method for producing a color filter in which colored pixels are formed by a step of forming a pattern on a photosensitive resin by a photolithography method, a dry film is transferred using a laminator roll having a rubber hardness of 50 IRHD or less. It is a manufacturing method of a color filter.

[0009]

EXAMPLE A glass substrate (200 × 30) in which a BM of a Cr thin film is formed in advance using a red dry film formed by film-forming a colored photosensitive resin solution having a predetermined composition
A red photosensitive resin layer was laminated on 0 × 1.2 mm, Corning # 7059). The laminating conditions are a roll temperature of 120 ° C., a roll pressure of 4 kg / cm ² and a speed of 1.5 m / min. Then, alignment was performed using a negative mask having a predetermined pattern, and then exposure was performed from the substrate surface side with a 3 kW ultra-high pressure mercury lamp. After that, spray development was performed with a 2 wt% Na ₂ CO ₃ aqueous solution for 20 seconds to remove the unexposed portion, and 1
A tinted pattern was formed. Similarly, blue and green dry films were used to form the second and third colors. At this time, the result of the lamination performed by changing the rubber hardness of the laminator roll is shown in Table 1. O indicates that there is no transfer failure in 3 pixels, and x indicates that there is transfer failure. The conditions other than the rubber hardness were the same as when forming the first color.

[0011]

[Table 1] Rubber hardness (IRHD) 40 50 60 70 70 ──────────────────────────── 2nd color pixel ○ ○ ○ × 3rd color Pixel ○ ○ × ×

[0010]

According to the present invention, the transfer failure of the colored film can be eliminated.

[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. Polarizing plate 9

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nobuaki Takane 48 Wadai, Tsukuba City, Ibaraki Hitachi Chemical Co., Ltd. Tsukuba Development Laboratory (72) Inventor Ken Yoshida 48 Wadai, Tsukuba City, Ibaraki Hitachi Chemical Co., Ltd. Incorporated company Tsukuba Development Laboratory

Claims (1)

[Claims] 1. A step of transferring onto a transparent substrate using a photosensitive dry film composed of a base film and a photosensitive resin colored in one color on the transparent substrate, and a step of forming a pattern on the photosensitive resin by a photolithography method. A method of manufacturing a color filter, wherein a dry film is transferred by using a laminator roll having a rubber hardness of 50 IRHD or less in the method of manufacturing a color filter for forming colored pixels by.