JPH02287435A - liquid crystal display device - 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] [Industrial application field] The present invention relates to a liquid crystal display device.

[Conventional technology] A conventional liquid crystal display device will be explained using FIG. 2.

FIG. 2 is a sectional view of a conventional liquid crystal display device.

In a conventional liquid crystal display device, an electrode 8 on a lower transparent substrate 6 and a transparent electrode 4 on an upper transparent substrate 1 are connected via a vertical conductive agent 9.

[Problem M to be solved by the invention] However, in the above-mentioned conventional technology, the resistance value of the transparent electrode is high, and especially in the case of a large screen display device, a voltage delay occurs.
It was not possible to apply sufficient voltage to the pixel electrodes, causing a drop in contrast ratio and color reproducibility.

The present invention is intended to solve these problems.The purpose of the present invention is to provide auxiliary metal wiring on a transparent substrate and create vertical conduction between the metals, thereby reducing uneven contrast, uneven response, and color. The aim is to eliminate display irregularities such as unevenness and obtain a liquid crystal display device with uniform and high image quality.

[Means for Solving the Problems] The liquid crystal display device of the present invention is a liquid crystal display device that includes means for controlling the electro-optical effect of liquid crystal on a pair of substrates, and the pair of substrates are electrically connected through a conductive material. The terminal is characterized in that the terminal that establishes conduction is made of a metal material.

[Example] Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a sectional view of a liquid crystal display device of the present invention.

First, as a means for controlling the electro-optic effect of liquid crystal on a transparent substrate 6, a polysilicon thin film transistor as shown below (
It is formed by steps 1) to (9).

(1) Low pressure CVD for polysilicon film that will become the channel part
Form and butter.

(2) Form a gate oxide film by thermal oxidation.

(3) A polysilicon film that will become the scanning line and gate electrode is formed by low pressure CVD and patterned.

(4) Phosphorus ions are implanted to form source and drain regions.

(5) A 3102 film is formed as an interlayer insulating film by CVD.

(6) Patterning the interlayer insulating film to open contact holes.

(7) An ITO film that will become the pixel electrode 7 is formed by sputtering and patterned.

(8) An A1 film that will become the data line and the upper and lower conductive terminals 8 is formed by sputtering and patterned.

(9) A 5in2 film is formed as a protective film over the entire surface of the substrate except for the mounting terminals by mask sputtering.

Next, a Cr film is formed on the transparent substrate 1 by sputtering, patterned to form a light shielding layer 2, and R/G-B color filter layer 3 is formed by a printing method. Then, an ITO film is formed on the entire surface of the substrate as a common electrode 4 on the color filter layer by sputtering, and a Cr film is formed on the ITO film by sputtering, vapor deposition, etc., and then buttered to form metal auxiliary wiring 5. are formed into a matrix.

Here, the metal material on the ITO film is not limited to Cr, but any film with low resistance may be used, for example, A1, T
There are i, Mo, Ni, etc. Further, the film may have two or more layers, such as Cr+Al.

Further, in this embodiment, the light-shielding layer and the metal auxiliary wiring are formed separately, but the metal auxiliary wiring may be used as the light-shielding layer.

Next, polyimide is applied as an alignment film to each of the pair of substrates only on the display area using a roll coating method, baked, rubbed, and bonded together using a sealing agent 10 mixed with an upper and lower conductive agent 9 and a spacer. Finally, finally,
After the liquid crystal 11 was sealed, an ultraviolet curable resin was applied to the sealing opening to seal it, thereby obtaining a liquid crystal display device.

[Effects of the Invention] As explained above, the present invention provides metal auxiliary wiring on a transparent substrate and vertical conduction between metals, thereby achieving
We were able to lower the resistance of the common electrode and the contact resistance.

As a result, display unevenness such as contrast unevenness, response unevenness, and color unevenness was eliminated, and a liquid crystal display device having a uniform high contrast ratio and good color reproducibility could be obtained.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the liquid crystal display device of the present invention, and FIG.
1 is a cross-sectional view of a conventional liquid crystal display device. Transparent substrate Light-shielding layer Color filter layer Common electrode Metal auxiliary wiring Transparent substrate Pixel electrode Vertical conduction terminal Vertical conduction agent Sealing agent Liquid crystal or higher

Claims (1)

[Claims] A liquid crystal display device comprising a means for controlling the electro-optical effect of a liquid crystal on a pair of substrates, and in which the pair of substrates are electrically connected by a conductive material, wherein the terminal for establishing electrical conduction is made of a metal material. Display device.