JPS59114517A - Colored liquid crystal display device - Google Patents

Abstract

PURPOSE:To obtain clear display which does not cause any parallax when viewed from an oblique direction, by forming plural picture elements having color polarization characteristics in the same layer and putting this polarization layer between a transparent electrode and liquid crystal layer. CONSTITUTION:A transparent electrode 5 is formed on a glass substrate 4 to have a striped pattern. After dipping in PVA solution, the substrate 4 is heated from both sides while it is pulled up, and then, the substrate 4 is rubbed with a cloth-made roller, onto which cotton fibers are planted so that PVA film molecules are elongated and arranged in one direction, with the substrate being heated at 130 deg.C and the roller being pushed against the substrate. After removing the PVA film on unnecessary surface, the remaining PVA film is dyed to have a stripe-like pattern of, for instance, three colors of red, blue, and green with a dichroic dye. In this case, each stripe is formed to have a prescribed width. Otherwise, after the PVA film is dyed to the three colored stripe-like pattern, the PVA film molecules are arranged in one direction in the above mentioned manner, and thus, a colored polarization layer 9 is formed. Then another substrate 4 with a transparent electrode 5 and transparent insulating film 6 on one surface and black-white polarization film 10 on another surface is attached to the substrate 4, with the polarization directions of their polarization films 9 and 10 intersecting each other at right angles. A colored display having no parallax is obtained in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a multicolor liquid crystal display device using a color polarizing layer, and particularly to the polarizing layer thereof.

FIG. 1 is a diagram for explaining a conventional color liquid crystal display device. In the figure, 1 is a red color polarizing plate, 2 is a blue color polarizing plate, 3 is a green color polarizing plate, 4 is a transparent substrate made of vitrification or synthetic resin film, 5 is a transparent electrode, 6 is an insulating film, 7 is a liquid crystal layer, and 8 is a black and white polarizing plate. In this way, in the conventional color liquid crystal display device, for color display, the color polarizing plate 1.2.3, which has 41 pixels each, is used as a unit for the three primary color elements of red, blue, and green. It is pasted on the outer surface of the J-light board 4, and d! is attached to each element and each picture element. The I-light electrodes 5 were formed on two transparent mounting plates 4, respectively, and driven in a twisted nematic manner. However, in this method, as the unit picture element is made smaller, the thickness of the transparent substrate 4 on which the polarizing plate 1.2.
There was a parallax at 112 degrees when viewed from an angle for about 1 minute, which caused the disadvantage that even when the liquid crystal display was turned on, a color different from the desired color could be seen.

The purpose of the invention is to eliminate the drawbacks of the prior art, and to provide a color liquid crystal display system (device) that can display bright colors without parallax caused by the thickness of the cutting board. be.

In order to achieve this object, the present invention is characterized in that a color polarizing layer made of picture elements having a plurality of color polarization characteristics in one deaf layer is disposed between a transparent electrode and a liquid crystal layer. It is.

For example, polyvinyl alcohol (hereinafter abbreviated as P■Δ) is used as the base material of the color polarizing layer, but PVA
If the film is uniaxially stretched to a thickness of about 20 μm or less, pinholes will occur and the layer will not be completely formed, which is not preferable. On the other hand, if a pVA solution is applied onto a transparent electrode by a method such as a dipping method, a spray method, or a spinner method, and then dried, a uniform, extremely thin PVA film with almost no pinholes and a thickness of 1 μm or less can be obtained. This film was heated to around 130°C and then rubbed over it in one direction many times with a roller or squeegee wrapped around a cotton fiber cloth while pressing it against the front panel. is PVA
The molecules of the membrane are stretched in the direction of rubbing. If this stretched PVA film is dyed in multiple colors with a water-soluble dichroic dye, a multicolored color polarizing layer can be formed on the electrode layer.

Separately, if the PvA coating is dyed with a solution containing dissolved iodine, a black polarizing layer can be created. '4 o PVA layer can be created by combining the liquid crystal cell with the color polarizing layer and black and white polarizing layer described in @Ii, with the polarizing layers facing each other, and the light absorption axes being perpendicular to each other. When the liquid crystal molecules are rubbed lightly, the liquid crystal molecules align at an inclined angle in that direction. Therefore, polarized light K
When rubbing the PVA layer to make it have l, the PVA molecules are aligned and the liquid crystal molecules when used as a liquid crystal cell
It is also possible to impart the orientation of . Fortunately, the light absorption axis and the alignment direction of the liquid crystal coincide, so the relationship between the rubbing direction of a conventional twisted nematic liquid crystal cell and the light absorption axis of the polarizing layer is the same as that of ζC') % flf
A twisted nematic multicolor liquid crystal display device can be obtained by simply combining the substrates on which the polarizing layers described in J are formed.

If necessary, a crystalline layer of titanium oxide or an alignment layer of other materials may be formed on the PVA cypress J2. However, when forming them, it is necessary to rub them in the same direction as the PVA layer below, or to perform diagonal deposition so that the layering force quotient is the same. In the multicolor liquid crystal display device created in this way, the polarizing layer is closer to the liquid crystal layer than in conventional devices, so there is no parallax caused by the thickness of the JA analysis when viewed from an angle, and the drive oil is clean. Next, let's talk about the actual example of the light that can bring out the colors! N! W Ming 1-
Ru.

Example 1 A 7fL coffin;
After the film is formed by sputtering, vapor deposition, etc., a pattern with stripes 120 μm wide at a pitch of 130 μm is formed using a normal photolithography process. This board is made of PVA (Kuraray Co., Ltd. product name: PVA)
117) for 5 minutes, and then pulled out while heating both A1 and 1J with infrared rays. This board is 1
Heating it to 30℃ and rubbing it in one direction many times from Gt f, .

After removing unnecessary PVAki on the electrode terminals on the front and back sides, photoresist (manufactured by Tokyo Ohka Kogyo Co., Ltd., product names E, P, P, I ()) was applied to the PVA layer side using a spray method. Prebaked for 1υJ at ℃ for 30 minutes and 5μ
The film thickness is set to mn. This film is 130μm Fil
The dark part of the stripe of
The strip was aligned with the pattern of the IT() film of the stripe, exposed between glass plates for 10 to 15 seconds using a mercury lamp, developed, and post-baked at 96° C. for 30 minutes. This film was immersed in a dye solution consisting of a 3% Congo Red aqueous solution for 2 minutes, washed with water, and dried.
The m-wide stripe is dyed red. After stripping the resist and performing NIH, repeat the same process twice. However, the exposure was performed by shifting the previous mask by 130 μm and exposing it to 3% aqueous solutions of methylene blue and malachite green, respectively. ! :f Next stain the PVA blue and green by soaking for 5 minutes. Separately, a silicon dioxide film having a thickness of xoooox is formed by sputtering on a substrate patterned with ①TOIIQ as described in TitJ.

Next, a silane coupling agent (Toshi Co., Ltd.
A liquid crystal cell is assembled using this substrate and the plate on which the nine layers of the three primary colors are formed so that the ITO1]i'4 stripes are perpendicular to each other. Then, a black and white polarizing plate was pasted on the back side of the substrate so as to be perpendicular to the polarization axis of the color 1,1 light.
When R61) is injected, a multicolor liquid crystal display device without sight threads can be created.

Figure 2 shows a color liquid crystal display device P obtained in this way.
'4, 4 is a transparent substrate, 5 is a υ5 bright electrode, 6 is an insulating layer, 7 is a liquid crystal layer, 9 is a color polarizing layer of three primary colors, 10
is a black and white polarizing layer.

Example 2 Instead of dyeing PVA Pll with the dichroic dyeing method in Example 1, it was immersed in an aqueous potassium iodide solution (iodine concentration 0.02%) for 5 minutes, and as in the previous example, After rubbing the surface, this substrate and a plate having a color ([, i-optical layer) similar to that in Example 1 were attached so that the polarizing layers faced each other and the polarizing axes crossed each other, and a biphenyl-based liquid crystal ( By injecting Chisso Corporation product name GR61), a multicolor liquid crystal display device QZ without parallax can be produced.

Until now, when dipping the PVA layer, a PVA solution containing no dichroic dye was used, and i! Although we used a process of rubbing with cotton after 2 washes and then dyeing each color with Dye $1, it is also possible to first form a dyed PVA layer for each color area. This example will be described below.Example 3 A photoresist (manufactured by Tokyo Ohka Kori Co., Ltd., product names E and P) was applied onto a substrate patterned with I T 01iλ used in Example 1 in stripes with a pitch of 130 μm.

P, R) was applied by a spray method, exposed and developed using the photographic original plate used in Example 1 in accordance with the stripes of the ITO film, and then a PVA aqueous solution of 3 cm and 2 cm of Congo Red (
Immerse it in PVA (product name: 117) manufactured by Kuraray Co., Ltd., and apply 13 to the area corresponding to the resist opening.
A striped PVA aqueous solution with a width of 0 μm is formed. After removing the resist with a stripping solution, repeat this process 2 times.
After repeatedly immersing the resist in a PVA solution containing 3% methylene blue and malachite green while shifting the resist opening by 1 pitch, a PVA layer with stripes 130 μm wide was formed in the order of red, blue, and green. A cotton fiber cloth roller rubs the PVA layer to give it color polarizing properties.

This substrate and the substrate having black and white polarizing layers dyed with iodine used in Example 2 were assembled into a liquid crystal cell so that the polarizing layers faced each other and the polarization axes of the polarizing layers were perpendicular to each other. Manufactured by Chisso Corporation, product name GR61)
By injecting , a parallax-free color liquid crystal display device can be obtained. This liquid crystal display bag tube is shown in FIG.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a conventional color liquid crystal display device 11/1. FIGS. 2 and 3 are sectional views of color liquid crystal display devices according to embodiments of the present invention. 4...Transparent substrate, 5...Transparent electrode, 7
...Liquid crystal layer, 9...Color polarizing layer, 1
0...Black and white polarizing layer. 1vA 1 Figure 2 4 Procedural amendment (voluntary) February 1981 241 Commissioner of the Patent Office Kazuo Wakasugi 1, Indication of the case 1982 Patent Application No. 223694 2, Title of the invention Color liquid crystal display device 3, Relationship with the case of the person making the amendment Applicant address: 1-7, Yukitani Otsuka-cho, Ota-ku, Tokyo (1) The description of the bucket in the scope of patent claims is amended as follows. ``(1) A color liquid crystal display device characterized in that a color polarizing layer having a color polarization characteristic of a view and having a color polarizing layer in the same pixel layer circle is formed between a transparent electrode and a liquid crystal layer. A color liquid crystal display device according to claim (1), characterized in that the color polarizing layer is a coating film that is glued and dyed on the surface of a transparent electrode. (3) Scope of Claims A color liquid crystal display device according to claim 1, characterized in that the color polarizing layer is a uniaxially stretched synthetic resin layer. (4) In claim 0), the color polarizing layer A color liquid crystal display device characterized in that red, blue, and green picture elements are provided in a layer in a live shape "each having a constant width." (5) A color liquid crystal display device according to claim U, characterized in that the polarizing layer is made of a polyvinyl alcohol film. ”C] Correct “on” in pages 1 to 2 of the specification to “lit”. (3) "If necessary..." on page 5 of the statement, lines 4 to 8.
··There is a need. ” will be deleted. (4) In the details, ``Made by Tokyo Ohka Kogyo Co., Ltd.'' on page 16, line 8 will be corrected to ``Made by Fuji Pharmaceutical Co., Ltd.''

Claims (5)

[Claims] (1) A color liquid crystal display device characterized in that a color polarizing layer having a plurality of picture elements having a plurality of color polarization characteristics in the same layer is formed between a transparent electrode and a liquid crystal layer. (2) A color liquid crystal display device according to claim (1), wherein the color polarizing layer is a coating film that is applied and dyed on the surface of a transparent electrode. (3) A color liquid crystal display device 2 according to item (1), characterized in that the color polarizing layer is a uniaxially stretched synthetic resin layer. (4) A color liquid crystal display device according to claim 11, characterized in that the color polarizing layer is provided with red, blue, and green picture elements in the form of stripes with a predetermined width. (5) A color liquid crystal display device according to claim (1), wherein the color polarizing layer is composed of a polyvinyl alcohol film.