JPS60182418A - Color liquid crystal display device - Google Patents

Abstract

PURPOSE:To reduce slip between a color filter and an image element electrode by forming a color filter made of a dyed thin PVA film on the side of a base same as the side of a semiconductor driving circuit. CONSTITUTION:A thin PVA film 9a having a thickness of <=300nm is formed on an insulating film 5b formed on a semiconductor circuit by spin coating, and it is exposed through a photomask opened in accordance with the orienting part of a cell is exposed except a sealant and a terminal part to remove its unnecessary part. Then, a photoresist is applied and the resist at image element parts corresponding to the first dyed layer is opened, and the opening part is subjected to dyeing and fixing treatment to peel the resist with a solvent. This step is repeated thrice, to form three color filters of red, green, and blue. The third PVA layer 9c is subjected to a rubbing treatment in the direction intersecting that of the opposite base at right angles.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid crystal display device, and more particularly to a color liquid crystal display device in which a semiconductor drive circuit is integrally provided on a substrate constituting a display portion of the display device.

Figure 1 shows a liquid crystal layer sandwiched between a pair of opposing substrates.
1 shows a conventional example of a color liquid crystal display device used in a transmissive TN mode, in which a semiconductor drive circuit is integrally provided on one of the substrates. In the figure, reference numeral 10 indicates a liquid crystal layer, 11 indicates a pair of substrates made of glass or the like that sandwich the liquid crystal layer, and 12 indicates a deflection plate provided on the outside of the substrate.

On the substrate on the semiconductor drive circuit side, there is a gate electrode 1 made of a transparent conductive film or a thin conductive film of metal such as KT, and an I
A pixel electrode 2 made of a transparent electrode such as a TO film or a SnO a source electrode 4a made of At or the like provided in contact with one end of the semiconductor, and a drain electrode 4b made of Kt or the like provided in contact with the other end of the semiconductor and connected to the pixel electrode, etc. is configured.

An insulating film 5b is formed on the semiconductor drive circuit configured as described above.
An alignment layer 9 made of, for example, polyimide, polyamide, polyvinyl xylylene, polyvinyl alcohol, etc.
For example, ZLI 1253, Z manufactured by Merck & Co.
In order to control the alignment of the liquid crystal layer 10 made of a liquid crystal material such as LI 1694 or ZLI 2411, a rubbing process is performed in a direction perpendicular to the counter electrode to form a twisted structure, and a polarizing plate 12 is provided on the outside. On the substrate on the counter electrode side, Rp G p B color filters 6.7.8 (for example, gelatin dyed film, P
(consisting of VA dyed film, etc.) is formed, and an alignment film 9 is formed on it.
is formed.

In this way, in conventional devices, the color filter substrate and pixel electrode substrate were constructed separately, so alignment during assembly had to be done within the allowable misalignment between the color filter and pixel electrode, reducing yield. It had decreased significantly. Furthermore, it has required the complicated process of separately forming color filters and alignment films.

SUMMARY OF THE INVENTION An object of the present invention is to provide a color liquid crystal display device that eliminates the drawbacks of the conventional example as described above and improves the yield during assembly of the device.

A color liquid crystal display device according to the present invention is a liquid crystal display device in which a liquid crystal layer is sandwiched between opposing substrates, and a semiconductor drive circuit is provided on at least one of the substrates, the substrate on which the semiconductor drive circuit is provided. Polyvinyl alcohol on the side (
The main feature is that a PVA) thin film is formed and predetermined pixel portions of each layer are dyed R, G, and H to form a color filter.

In the present invention, when forming a color filter on the semiconductor drive circuit board side, the position of the color filter at this time is precisely aligned and formed, so that the upper and lower boards can be repositioned to prevent misalignment during seal crimping that is inevitable during assembly. Alignment is unnecessary, and it is possible to improve the p display quality and assembly yield. Furthermore, this color filter can also function as an alignment film by using PVA'6 in the dyeing layer, so it is possible to simplify the manufacturing process.

An embodiment of a color liquid crystal display device according to the present invention is shown in FIG. FIG. 2 shows an example in which the present invention is applied to a color liquid crystal display device used in a transmission type TN mode.
12 corresponds to the parts designated by the same reference numerals in FIG.

Similar to the one shown in FIG. 1, on the substrate on the semiconductor drive circuit side are a dirt electrode 1 made of a transparent conductive film or a thin conductive film of metal such as At, and a transparent electrode made of an ITO film or a SnO2 film. A pixel electrode 2, a thin film semiconductor 3 made of an amorphous silicon semiconductor or the like formed on the dirt electrode 1 through an insulating film 5 made of, for example, a silicon nitride film, and a semiconductor 3 in contact with one end of the semiconductor. A source electrode 4a made of At or the like is provided, and a drain electrode 4b made of At or the like is provided in contact with the other end of the semiconductor and connected to the above-mentioned pixel electrode.

On the semiconductor circuit configured as described above, dyed vinyl layers 9ap9b and 9c are laminated with an insulating film 5bi interposed therebetween, and the uppermost layer 9c functions as an orientation control layer.

The dyeing layer is made of a PvA thin film with a thickness of 2000 to 3000X, and the third layer 9c is rubbed in a direction perpendicular to the opposing substrate, and is coated with a P-type liquid crystal, for example, ZL.
I 1253, ZLI 1694.

ZLI 2411 or the like is used and has a twisted structure depending on the rubbing direction of the wall surface.

The linear polarizing plate 12 is placed outside the display device holding the liquid crystal in this way with its axes parallel to each other.

Color filters R, G, and B are formed by the dyed layers 9a, 9b+9c formed as described above. In FIG. 2, 6 is a color filter formed on the first dyeing layer 9a, for example Red, 7 is a color filter formed on the second dyeing layer 9b, for example Green, and 13 is a color filter formed on the third dyeing layer 9C. The color filter is, for example, Blue, and the color filter layer thus laminated is made of PVA and also functions as a υ alignment layer. The opposing electrodes only require an alignment layer, and precise alignment of the upper and lower substrates is not required.

Formation examples of each of the above color filter layers will be described below.

For the dyeing layer, a solution of 5 ton of ammonium dichromate mixed with 5 ton of PVA aqueous solution was applied at a concentration of 2000 to 300.
1 s by spin code for 10 s at 0 rpm
Form a thin film of OOOi or less Next, use a photomask with openings corresponding to the cell alignment area to expose the area excluding the seal and terminal area, and remove unnecessary areas by water development. After drying for a few minutes, the photoresist is coated, the resist is fully opened in the pixel portion corresponding to the first dyeing layer, and dyeing is applied thereto. For dyeing, the entire substrate is immersed in a 50% solution of direct dye or reactive dye heated to 60° C. for about 5 minutes.

Next, in order to fix the dye, a fixing solution such as Senkafix 300 (Japan Tohoku) is heated to 60°C and immersed in this bath for 10 minutes for fixing, and then the resist is stripped off with a solvent.
Heat and fix. The dyes used for dyeing include direct dyes such as 885carlet BNScone and SS.
Blue BRRcone, sB Yellowr
BCcone etc., and reactive dye type Yellow
w2GL'.

Br11th ant 5carlet Rcone,
After dyeing, which may be Br1llint Blue Re or the like, it is fixed with an amine-based fixer such as Incafix 300 (Tohoku, Japan) to form a dyed layer with good weather resistance. ``This process is repeated three times to form a color filter layer and a color filter layer that also serves as orientation control.

Although the three-layer structure of PVA is shown in the embodiment, the present invention is not limited to this, and if the color filter layer in contact with the liquid crystal is partially dyed with PVA, it can also be used as an alignment layer.

In the color liquid crystal display device configured as above,
When an electric field is applied to each pixel configured in this way,
The light passes through a predetermined filter and colored light is observed.

The color liquid crystal display device according to the present invention can achieve the following effects with the above-described configuration.

(1) Since the color filter layer is formed on the semiconductor drive circuit board side, when the upper and lower boards are bonded (assembled), there is no need for alignment with an accuracy of several microns as in the conventional method.

(2) Since the color filter layer is formed by dyeing PVA thin films, this layer can function as an alignment layer, and the manufacturing process can be simplified.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an example of a conventional color liquid crystal display device, and FIG. 2 is a sectional view showing an embodiment of the color liquid crystal display device according to the present invention. 1... Dirt electrode 2... Display pixel electrode 3... Amorphous silicon semiconductor 4a... Source electric ffl 4b... Drain as pole 5
a, sb...Insulating layer 6...Color filter (Red) 7...Color filter (Green) 8...Color filter (
Blu composite layer 9・Orientation layer 9a...first dyeing layer 9b
...Second dyed layer 9c...Third dyed layer 10...Liquid crystal layer 11...Glass substrate 12...Polarizing plate Fig. 1, Fig. 2

Claims (1)

[Claims] In a liquid crystal display device in which a liquid crystal layer is sandwiched between opposing substrates and a semiconductor drive circuit is provided on at least one of the substrates, a polyvinyl alcohol thin film is formed on the substrate side on which the semiconductor drive circuit is provided, 1. A color liquid crystal display device, characterized in that predetermined pixel portions of each layer are dyed R, G, and H to form color filters.