Structure of a liquid crystal display and method of manufacturin

Details Structure of a liquid crystal display and method of manufacturin Structure of a liquid crystal display and method of manufacturin

1997-07-17

1999-03-16

Sikes, William L.

Liquid crystal cells, elements and systems

Particular excitation of liquid crystal

Electrical excitation of liquid crystal

349 38, 349122, 349138, G02F 1136, G02F 11343

Patent

active

058836829

ABSTRACT:
A method of manufacturing an active panel of a liquid crystal display reduces the steps of a masking process and prevents line disconnection of a conductive material forming a pixel electrode which is caused by undercutting and eliminates a stepped profile formed during the etching processes. Materials forming a gate insulating layer, a semiconductor layer, an impurity doped semiconductor layer, and source and drain electrodes are sequentially deposited on a substrate. The source and drain electrodes are formed. Then, the semiconductor layer and the gate insulating layer are simultaneously formed. Thus, the mask processes in the method are reduced. However, this method results in a severe stepped profile caused by simultaneously etching the materials under the source and drain electrodes during the step of forming the source and drain electrode. As a result, line disconnection occurs due to the stepped profile during the forming step of a pixel electrode. In order to prevent this problem, a protection layer made of an organic material is formed prior to the step of forming the pixel electrode, resulting in a smooth surface and elimination of line disconnecting.

REFERENCES:
patent: 5757453 (1998-05-01), Shin
patent: 5763899 (1998-06-01), Yamazaki et al.

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