Liquid crystal cells – elements and systems – Particular excitation of liquid crystal – Electrical excitation of liquid crystal
Patent
1999-06-29
2000-08-01
Kim, Robert H.
Liquid crystal cells, elements and systems
Particular excitation of liquid crystal
Electrical excitation of liquid crystal
349 42, 349133, 349141, G02F 1136
Patent
active
060974540
ABSTRACT:
In an active matrix liquid-crystal display device, a metal common electrode 22 that also serves as a black matrix is disposed to cover the peripheral portion of a pixel electrode 24 which is formed of a transparent electrically conductive film. The common electrode 22 functions as the black matrix that covers the peripheral portion of a pixel and is held to a given potential, so that a region where the pixel electrode 24 and the common electrode 22 are overlapped with each other functions as an auxiliary capacitor 25. The auxiliary capacitor is structured through an insulation layer 23. The common electrode 22 is formed on the insulation layer 21 having a flatten surface to make the auxiliary capacitor 25 larger. With this structure, even though the insulation layer 23 is thinned to about 1 .mu.m, a pin hole, leakage, etc., between the common electrode and the pixel electrode can be prevented, to thereby obtain a larger auxiliary capacitor.
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Takemura Yasuhiko
Yamaguchi Naoaki
Zhang Hongyong
Kim Robert H.
Semiconductor Energy Laboratory Co,. Ltd.
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