Liquid crystal cells – elements and systems – Particular excitation of liquid crystal – Electrical excitation of liquid crystal
Reexamination Certificate
2006-11-28
2006-11-28
Schechter, Andrew (Department: 2871)
Liquid crystal cells, elements and systems
Particular excitation of liquid crystal
Electrical excitation of liquid crystal
C349S129000, C349S136000
Reexamination Certificate
active
07142259
ABSTRACT:
Before starting the regular display in a liquid crystal display device of the bend alignment type, it is necessary to transition all the pixel regions in the entire display portion uniformly from splay alignment into bend alignment. However, conventionally, when applying a simple ac voltage, the transition sometimes does not take place, and when it does take place, the transition time is very long, and display defects due to alignment defects tend to occur.In the method for driving a liquid crystal display device with OCB cells according to the present invention, a step of applying between an electrode22and a pixel electrode23an ac voltage superimposed with a bias voltage, and a step of applying zero voltage or a low voltage to the substrates are repeated in alternation preceding the begin of the regular display operation and the regular display operation is carried out after all pixels have transitioned into bend alignment.
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Adachi Katsumi
Hatta Shin-ichiro
Hattori Katsuji
Ishihara Shoichi
Kubota Hirofumi
McDermott Will & Emery LLP
Schechter Andrew
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