JPS6048070A - Liquid crystal display unit - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a color liquid crystal display device, in particular, for the purpose of increasing the aperture ratio, which is one of the important factors for improving the display effect, the pixel electrodes and their winding lead wires are coated with an insulating layer. In particular, the present invention relates to a color liquid crystal display device in which electrical conductivity is provided through through-hole portions of an insulating layer, and the insulating layer also serves as a color filter layer.

In recent years, a wide variety of display devices have been developed, including plasma displays, light-emitting diodes, CRTs, fluorescent display tubes, electroluminescence, and liquid crystals.These display devices have low power consumption, can operate at low voltages, and are independent of the environment and have good contrast. The development of liquid crystal display devices is particularly active due to the advantages of
C is being treated.

The present invention provides a color liquid crystal display device in which the amount of transmitted or reflected light changes depending on the magnitude of the voltage applied to a liquid crystal material, which has a number of advantages, and a color filter layer. By dyeing it in combination and arrangement, and using it as a color filter layer, it also serves as an insulating layer between the pixel electrodes and lead wires in the two-layer wiring system, thereby achieving the pixel spacing that is an advantage of the two-layer wiring system. In addition to the effect of increasing the aperture system (display area ratio) to the ideal state by reducing the size of The present invention relates to a color liquid crystal display device which also has the effect of being protected from mutual influence by the color filter constituent materials and the liquid crystal material by being protected by a film.

The configuration of the present invention will be explained below with reference to the drawings.

FIG. 1 is a sectional view of a color liquid crystal display device showing an example of the present invention, and FIG. 2 is a sectional perspective view showing each layer sandwiched between two transparent substrates. FIG. 3 shows a part of a plan view of the color filter/insulating layer. In all drawings of the present invention, similar parts are indicated by the same numbers.
Also, relative dimensions are not necessarily as shown.

In Figures 1 and 2, the transparent lead wire electrode (5) of the two-layer wiring is provided with a through hole (1) in the insulating layer (6).
One lead wire electrode (5) corresponds to one transparent pixel electrode (force) through the transparent pixel electrode (force).

Conventionally, the insulating layer (6) is usually made of an organic material such as polyimide, polyamide, rubber, etc., or an inorganic material such as Sin, with the highest possible transparency. Upper or counter electrode 02
) or on the opposite side (outside) of the liquid crystal (11) of one of the transparent substrates (4) α3). In the present invention, the insulating layer (6) itself The color filter/insulating layer (6) is formed using a water-soluble polymer that also has the characteristics of a color filter and can also be dyed with a desired dye to become a color filter layer. An example of the shape and arrangement of the pixels of layer (6) is shown below; however, the shape is not limited to the square shown, but may be rectangular, hexagonal, etc., and the arrangement may be various, such as a stripe arrangement or a delta arrangement.

Next, the color filter/insulating layer (6) will be further explained. First, a photosensitive material is made by mixing a photosensitive agent with a water-soluble polymer resin, and a film is coated on the transparent substrate (4) and the lead wire electrode (5) to a thickness of 05 to 6 μm using a spinner, roller coater, etc. The desired area is exposed to light using an ultra-high-pressure mercury lamp, metal halide lamp, etc. through an original mask, followed by a water mass image, and the relief batten in the area that has become sigma due to exposure is dyed with the desired dye. Next, this colored resin layer is chemically hardened to impart stain resistance, and the above steps are repeated to produce a color filter layer of the required number of colors (for example, 6 colors). The water-soluble polymer substance used here is gelatin, which has a number average molecular weight of 20
Examples include gelatin decomposition products having a molecular weight of 00 to 50,000, fishy glue, and polyamino acids such as polyglycine, polyproline, and polyglutamic acid.

Examples of photosensitizers include ammonium dichromate,
Examples include dichromates such as sodium dichromate and potassium dichromate, and various diazonium salts.

The next dye to be used is acidic 1. - There are water soluble dyes such as direct and basic, such as Kayanol Milling Yellow 0° Kasanol Cyanine G1 Kayanol Milling Red RS 1 Kayaquacid Orange (
Nippon Kayaku ■), Mitsui Nylon Fast Yellow 5G, Mitsui Brilliant Milling Green B.

Mitsuiashi Milling Sky Blue PSE (manufactured by Mitsui Toatsu Chemicals), Suminolumi IJ Prilliant Green 5Q, Acid Brilliant Milling Green S1 Suminol Milling Red I) G (manufactured by Sumitomo Chemical), Diasito First Rubinol 3G
2CIC1%, Diacitfast Orange N1)2
00) and above (manufactured by Mitsubishi Chemical Corporation ■)) Guinea Green (manufactured by Tokyo Kasei ■), etc. Furthermore, when making the above-mentioned color filter layer multicolored, by chemically hardening the same layer, properties such as stain resistance and water resistance are imparted to the same layer, and individual dyed layers are sequentially produced. The coating that makes this possible hardens by reacting ionically with cations such as amino groups and amide groups in the relief resin film.As a result, the wetting effect during dyeing is enhanced and the dye This is considered to be effective in preventing migration. Fixing agents that can be used for this purpose include Nylon Fix TH (manufactured by Nippon Someka) as a polyhydric phenol derivative, and Nylon Fix GL (manufactured by Nippon Someka) and Kayafix NA (manufactured by Nippon Someka) as polyhydric phenol sulfonic acid derivatives. (manufactured by Yakuza Co., Ltd.), but there are many others.In addition to the dura mater staining method described above, as a method for preparing the color filter layer, there is also a method of producing a positive color filter layer by using a positive type photo of the parts other than the 171J resin that you wish to dye. It is also possible to use a so-called mask dyeing method, in which dyeing is performed using a resist mask such as 0FPR (Tokyo Ohka Kogyo ■), and this is repeated to obtain a desired color.

The color filter/insulating layer (
6) has a dielectric constant, specific resistance, etc. well within the required range for an insulating layer, and also has good light transmittance.

Furthermore, it is extremely close to the liquid crystal layer, which prevents visual color shift.

Transparent pixel electrode (color filter and insulating layer (6)
They have the same shape, have a film thickness of 200 to 400, and are electrically connected to the ends of the lead wire electrodes (5) one pair at a time through through holes (15) in the insulating layer (6). The shape of this through hole (15) may be a square, rectangle, circle, etc., and the size is about 50 to 150 microns. In addition, since the transparent pixel electrode (7) adopts a two-layer wiring method, there is no need to pass lead wire electrodes between pixels, and the pixel spacing can be made as small as possible to improve the area ratio of pixels occupying the panel. is possible.

The alignment film (8) and 0υ of the liquid crystal substance are aligned by a rubbing method, and the alignment film materials include organic materials such as polyvinyl alcohol, polyimide, polyamide, and polyester, and inorganic materials such as SiO2 and TiO2. Can be mentioned.

The liquid crystal layer (11) plays the role of a shutter in the color liquid crystal display device of the present invention, which adjusts the amount of light passing through the liquid crystal material depending on the applied voltage. Reisted nematic)
, G H-type liquid crystal (guest/host), etc. are used, and TN
Two polarizing plates (31(4) are used in the mold, but GH
In molds, it is common to use one polarizing plate (3) to enhance contrast.

The liquid crystal sealing material (9) is an epoxy resin or an inorganic sealing material that also serves as a spacer.

A transparent counter electrode (12+) is provided on one transparent substrate α3, and a light source (1) is provided via a diffuser plate (2+) to improve the uniformity of illumination of the light source (1).Light source (1) Various light sources including natural light can be used as the light source, and any light source can be selected depending on the characteristics of the color to be displayed.

Although the configuration diagram in FIG. 1 shows an example of a transmissive type display, a reflective type display can also be made by setting a reflecting plate at an appropriate position.

The color liquid crystal display device manufactured as described above can be used as a display that is exactly between the large displays seen in baseball stadiums and stadiums in recent years and general color televisions, and can be used to display digital images and characters output from computers, and to display VTRs.
- Suitable for stones that display videos, etc. from TV cameras.

It is also conceivable that it could be applied to flat-screen wall-mounted TVs, etc.

[Brief explanation of the drawing]

The drawings show an embodiment of the liquid crystal display device of the present invention. FIG. 1 is an explanatory diagram showing an example of a color liquid crystal display device, FIG. 2 is a cross-sectional perspective view showing each layer in a transparent substrate, and FIG. FIG. 2 is a plan view showing an example of a color filter/insulating layer. 1... Light source 2... Diffusion plate 3... Polarizing plate 4...
- Transparent substrate 5... Lead wire electrode 6... Color filter/insulating layer 7... Transparent pixel electrode 8... Alignment film 9... Seal material (spacer) 10... Liquid crystal layer 1
1... Alignment film 12... Transparent counter electrode 1... Transparent substrate 14... Polarizing plate 15 - Through hole Fig. 3

Claims (1)

[Claims] (1) A first transparent electrode provided on one surface of two opposing transparent substrates, a second transparent electrode provided on the other surface with a desired pixel shape, and a first and second transparent electrode provided on the other surface. The liquid crystal substance is sandwiched between a liquid crystal substance interposed between transparent electrodes, a color filter layer in which a dyed layer made of a water-soluble polymer is dyed in a desired color combination on at least one transparent substrate side with a predetermined dye, and the liquid crystal substance is sandwiched. In a hook-color liquid crystal display device comprising an alignment layer of liquid crystal molecules, each of the second transparent electrodes 111
A two-layer wiring method is adopted in which the second transparent electrode and the lead wire electrode are electrically connected through the through-hole portion of the lead wire through the insulating layer, without allowing the lead wire to pass through during the wiring. A color liquid crystal display device characterized in that the dyed color filter layer described above is also used as an insulating layer.