Liquid crystal cells – elements and systems – Particular excitation of liquid crystal – Electrical excitation of liquid crystal
Patent
1997-03-26
1999-02-02
Gross, Anita Pellman
Liquid crystal cells, elements and systems
Particular excitation of liquid crystal
Electrical excitation of liquid crystal
349 42, 438159, G02F 1136
Patent
active
058672338
ABSTRACT:
In an active matrix substrate of a liquid crystal display using a TFT as a switching device for each pixel, a gate bus line and a drain bus line extending perpendicular to each other are formed simultaneously by patterning a metal film, and one of the two bus lines is broken to provide a gap across which the other extends. The gap is covered by an island structure of a gate dielectric film and a semiconductor layer formed to provide the TFT, and a supplementary bus line makes direct contact with the broken bus line on both sides of the gap to provide a bridge over the gap. The supplementary bus line is formed together with a pixel electrode by patterning a transparent conductor film. By this arrangement of bus lines, the total number of photolithography steps in the production process is decreased so that the production cost can be reduced.
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Chowdhury Tarifur R.
Gross Anita Pellman
NEC Corporation
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