Active matrix liquid crystal with capacitor between light blocki

Details Active matrix liquid crystal with capacitor between light blocki Active matrix liquid crystal with capacitor between light blocki

1998-01-16

2000-07-11

Parker, Kenneth

Liquid crystal cells, elements and systems

Particular excitation of liquid crystal

Electrical excitation of liquid crystal

349 44, 349111, G02F 11343

Patent

active

060880708

ABSTRACT:
An conductive coating serves as a light shield film and is kept at a give voltage. A metal interconnection is located in the same layer as a source line and connected to the drain of a thin-film transistor. An interlayer insulating film is constituted of at least lower and upper insulating layers and formed between the conductive coating and the source line. According to one aspect of the invention, an auxiliary capacitor is formed by the metal interconnection and the conductive coating serving as both electrodes and at least the lower insulating layer film serving as a dielectric. The auxiliary capacitor is formed in a region of the interlayer insulating film in which the upper insulating layer has been removed by etching. According to another aspect of the invention, the conductive coating has a portion that is in contact with the lower insulating layer in a region where the conductive coating coextends with the metal interconnection.

REFERENCES:
patent: 5159477 (1992-10-01), Shimada et al.
patent: 5708485 (1998-01-01), Sato et al.
patent: 5745195 (1998-04-01), Zhang
patent: 5777701 (1998-07-01), Zhang
patent: 5818552 (1998-10-01), Sato
patent: 5899548 (1999-05-01), Ishiguru

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