JPS61275729A - Production of electrode plate for liquid crystal display device - Google Patents

Abstract

PURPOSE:To decrease voltage drop and to make low-voltage driving possible by forming a color filter by a mask dyeing method and consisting the filter itself of an oriented film thereby reducing the thickness of the filer. CONSTITUTION:A resin layer having 0.3-0.9mum film thickness is provided on a transparent substrate 11 provided with transparent electrodes 12 and a mask for an R pattern is exposed thereon. The resin layer is then developed to form a mask 4. The mask is dyed to a rod color (R) to form the R pattern. The patterns of green and blue colors are similarly formed by said mask dyeing method to form the color filter 13. The surface thereof is rubbed by a roll 15 made of 100mum nylon and is thereby oriented. The need for the oriented film is thus eliminated and the filter itself is made smooth and thin. The voltage drop by the thickness is decreased and the low-voltage driving is made possible.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for manufacturing an electrode plate for a liquid crystal display device used in a color filter for a full-color liquid crystal display.

<Prior Art> The conventional technology will be described with reference to FIG. 2, which shows a conventional example and a schematic cross-sectional view thereof.

A glass plate with a thickness of 1 to 1.1 fi (on top of 111 (lower in this figure)), transparent electrodes (121, red (R), green (G),
Color filter t+3 with a film thickness of 1.2 to 1.6 tl m having a color filter pattern of each color of blue (B)
1 (hereinafter abbreviated as cFJ) in order, dye the CF using the relief staining method, and then dye the CF.
An electrode plate for a liquid crystal display device was manufactured by mounting an alignment film 12D made of polyimide, polyamide, polyvinyl alcohol, etc. to a thickness of about 0.1 μm on F in order to align the liquid crystal in a certain direction.

<Problems to be Solved by the Invention> In the conventional manufacturing method of electrode plates for liquid crystal display devices, since there is an alignment film, resistance between transparent electrodes occurs in this area.
This caused a voltage drop, and since the CF film was thick, at 1.2 to 1.6 μm, it also acted as a resistor and caused a voltage drop.

Such a voltage drop between the transparent electrodes indicates that a high voltage must be used between the transparent electrodes to drive the device, which means that the transparent electrodes, drive circuit, etc. must be designed to handle higher voltages than necessary. This placed constraints on the overall design of liquid crystal display devices and shortened the lifespan of the liquid crystal display.

In addition, it is difficult to add further surface processing because it tends to disrupt the relief dyeing method that has been used in the past, and in extreme cases, domains with poor orientation may even occur.
Therefore, it has been difficult to reduce the thickness of the CF film beyond a certain level.

<Means for solving the problem> In a method of manufacturing an electrode plate for a liquid crystal display device, in which a transparent electrode is provided on a substrate, and a color filter is further provided on the substrate, a film thickness of 0. 3-0.9μm
A patterned mask is provided on the resin layer, a patterned mask is provided on the resin layer, a desired portion of the resin layer is dyed, and the mask is removed.The process is repeated as many times as necessary to provide a color filter, and furthermore, a color filter is provided on the surface of the color filter. An electrode plate for a liquid crystal display device is manufactured by performing rubbing treatment in a certain direction.

Effect> When an electrode plate for a liquid crystal display device is manufactured by the manufacturing method of the present invention, the surface of the MF can be provided smoothly by the mask dyeing method, so the CF itself can be subjected to rubbing treatment, and the CF itself can also be It can be made thin and has less voltage drop.

Furthermore, the smooth surface of the CF also helps improve reliability.

<Example> An example of the present invention will be described in detail with reference to FIGS.

Transparent glass plate (11; 1200 A thick ITO on top)
A transparent electrode α2 called .alpha.2 was patterned by etching using a known ferric chloride solution. On the substrate, an aqueous solution of Greeneux was applied as a color filter (131) to a thickness of 0.5 μm using a spin coater as shown in FIG. Photosensitive resin product name AZ15 manufactured by East Co., Ltd.
No. 50 was applied using a spinner, and after drying at 60° C. for 30 minutes, exposure and development was performed using a mask button with an R pattern in which holes were opened in stripes with a pitch of 450 μm and a width of 150 μm to prepare a mask Q41. Next, as shown in Figure 1 (b), 6
It was immersed in Suminol Fast Red B staining solution at 0° C. for 5 minutes to dye only the open pores red (R) to form an R pattern. After removing the resist pattern with an acetone stream, shift the mask pattern by 150 μm and apply the AZ1 pattern as in the previous process.
A G-pattern mask f141' was manufactured using a G-pattern 350, and immersed in Kayanor Milling Green 5GW staining solution at 60°C for 5 minutes as shown in Figure 1 (c).
One piece dyed. After removing the resist film, it was stained blue (Bl) with Supranor Cyaninque BF staining solution at 60°C, as shown in FIG.

After removing the resist, it was dried at 170° C. for 60 minutes to harden the film, resulting in a CF containing the three colors of R, G, and H as shown in FIG. 1 (e). After that, it was rubbed with a roll (151) lined with 100 μm nylon fibers as shown in FIG.

An alignment film treatment was performed and the product was completed as shown in FIG. 1 (G).

Next, a gap of 9 μm was provided between the ITO electrode and the counter electrode, and liquid crystal LCIS461 (manufactured by Chisso Corporation) was sealed, and good alignment was observed.

Note that the CF resin used in the present invention is polyvinyl alcohol, a copolymer of methacrylic acid or acrylic acid, low molecular weight gelatin, gris, and casein.

Any material that can be dyed with an acidic dye may be used.

And a sensitive material is not necessarily required. In addition, the resist material used for the mask may be any of HaAz-1550 (manufactured by Sible Far East Co., Ltd.), 0FPR (manufactured by Higashihara Ohka Co., Ltd.), etc., which are coated with a spinner or roll coater, dried, exposed and developed. Patterning is performed on the CF resin by a known method.

Further, during dyeing, only the necessary portions to be dyed are exposed through holes and dyed, and the resist after dyeing may be peeled off with a weak alkali, but it is preferable to use an organic solvent such as acetone that dissolves the resist.

Note that when the CF film thickness exceeds 1 μm, the effective voltage for driving the liquid crystal decreases, and the sharp rise of the liquid crystal disappears.

On the other hand, if it is less than 0.2μ, a sufficient dyeing effect cannot be obtained by the dye. Appropriate dyeing effects were obtained within the range of 0.3 to 0.9 μm. The water-reinforced resin was able to obtain good orientation by rubbing within this range.

The pond water invention can be modified in various ways within the scope of the present invention.

<Effects of the Invention> In the present invention, the CF surface can be smoothed by using the mask dyeing method for color formation of CF.
The surface of F itself can be used as an alignment film. This solves the problem of the thickness of the CF and the presence of alignment films, which cause voltage drops between transparent electrodes, and enables low-voltage driving, which improves reliability and simplifies design. This makes it possible to achieve longer life.

[Brief explanation of the drawing]

FIGS. 1A to 1G are schematic sectional views sequentially showing a method for manufacturing an electrode plate for a liquid crystal display device according to the present invention. Figure No. 1 is a schematic cross-sectional view schematically showing mounting of a liquid crystal display using a conventional method of manufacturing an electrode plate for a liquid crystal display device. nu...Transparent substrate (121...Transparent electrode (131...Color filter 1141 (+4' u4f=.? Suffu (19...
Roll 121/alignment film

Claims (1)

[Claims] 1) In a method for manufacturing an electrode plate for a liquid crystal display device, in which a transparent electrode is provided on a substrate and a color filter is further provided on the substrate, a film thickness of 0.3 to 0.9 is provided on the substrate provided with the transparent electrode.
A resin layer with a thickness of μm is provided, a patterned mask is provided on the resin layer, a desired portion of the resin layer is dyed, and the mask is removed. This step is repeated as many times as necessary to provide a color filter, and the color filter is further coated on the surface of the color filter. A method for manufacturing an electrode plate for a liquid crystal display device, characterized by performing a rubbing treatment in a certain direction.