LCD having a peripheral circuit with TFTs having the same struct

Details LCD having a peripheral circuit with TFTs having the same struct LCD having a peripheral circuit with TFTs having the same struct

1996-09-13

1997-12-23

Sikes, William L.

Liquid crystal cells, elements and systems

Particular excitation of liquid crystal

Electrical excitation of liquid crystal

349149, G02F 1136, G02F 11345

Patent

active

057011672

ABSTRACT:
An electro-optical device and a method for manufacturing the same are disclosed. The device comprises a pair of substrates and an electro-optical modulating layer (e.g. a liquid crystal layer having sandwiched therebetween, said pair of substrates consisting of a first substrate having provided thereon a plurality of gate wires, a plurality of source (drain) wires, and a pixel matrix comprising thin film transistors, and a second substrate facing the first substrate, wherein, among the peripheral circuits having established on the first substrate and being connected to the matrix wirings for the X direction and the Y direction, only a part of said peripheral circuits is constructed from thin film semiconductor devices fabricated by the same process utilized for an active device, and the rest of the peripheral circuits is constructed from semiconductor chips. The liquid crystal display device according to the present invention is characterized by that the peripheral circuits are not wholly fabricated into thin film transistors, but only those portions having a simple device structure, or those composed of a small number of devices, or those comprising an IC not easily available commercially, or those comprising an expensive integrated circuit, are fabricated by thin film transistors. According to the present invention, an electro-optical device is provided at an increased production yield with a reduced production cost.

REFERENCES:
patent: 4470060 (1984-09-01), Yamazaki
patent: 4838654 (1989-06-01), Hamaguchi et al.
patent: 5151689 (1992-09-01), Kabuto et al.
patent: 5247191 (1993-09-01), Yamazaki et al.
patent: 5250931 (1993-10-01), Misawa et al.
"An Active Matrix LCD with Integrated Driver Circuits Using a Si TFTs" M. Aklyama et al., Japan Display, pp. 212-215.
"Color Liquid Crystal Display", Shunsuke Kobayashi, Dec. 14, 1990, pp. 162-166.

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