Active matrix LCD with thin film transistor switches and method

Details Active matrix LCD with thin film transistor switches and method Active matrix LCD with thin film transistor switches and method

1998-01-27

2000-08-08

Parker, Kenneth

Liquid crystal cells, elements and systems

Particular excitation of liquid crystal

Electrical excitation of liquid crystal

349143, 430 30, G02F 1136, G02F 11343

Patent

active

061009504

ABSTRACT:
An active matrix LCD (Liquid Crystal Display) using thin film transistors as switching devices and a method of producing the same are disclosed. When a drain bus line and a pixel electrode are to be formed, a transparent conductive film and a low resistance metal film are sequentially laminated in a double layer structure. Only the metal film is removed from the pixel electrode by side etching effected via holes formed in the pixel electrode. This allows a low resistance drain bus line and a transparent pixel electrode to be formed by a single photolithographic step. As a result, the wiring resistance of the LCD can be lowered without increasing the number of times of photolithography, allowing the LCD to be provided with a wide screen.

REFERENCES:
patent: 4697331 (1987-10-01), Boulitrop et al.
patent: 5229873 (1993-07-01), Hirose et al.
patent: 5728592 (1998-03-01), Oki et al.
patent: 5858807 (1999-01-01), Kawamura

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