Liquid crystal display device with TFT ESD protective devices be

Details Liquid crystal display device with TFT ESD protective devices be Liquid crystal display device with TFT ESD protective devices be

1995-02-27

1997-09-23

Sikes, William L.

Liquid crystal cells, elements and systems

Particular excitation of liquid crystal

Electrical excitation of liquid crystal

349 42, 349123, 349138, 257356, G02F 11333, G02F 1136, G02F 11337, H01L 2362

Patent

active

056710267

ABSTRACT:
Picture elements and driving circuits for driving respective picture elements are monolithically formed on an insulating substrate. A protective circuit is provided for allowing input-output terminals of a driving circuit to conduct when a potential difference of not less than a predetermined value is generated. The protective circuit includes an MOS transistor, and a turn-on voltage thereof is set according to a thickness of a gate insulating layer. The protective circuit is formed on the insulating substrate simultaneously when forming the driving circuits. In this arrangement, because the turn-on voltage is set according to the thickness of the gate insulating layer and the thickness can be easily adjusted, an accurate turn-on voltage can be achieved. Since the arrangement prevents an increase in manufacturing cost, the driving circuits, etc., can be surely protected against static electricity generated in the manufacturing process and the input surge in the normal operation.

REFERENCES:
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patent: 5497146 (1996-03-01), Hebiguchi
patent: 5521728 (1996-05-01), Kodate et al.
patent: 5535084 (1996-07-01), Nakayama

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