Dynamic drive method and apparatus for a bistable liquid crystal

Details Dynamic drive method and apparatus for a bistable liquid crystal Dynamic drive method and apparatus for a bistable liquid crystal

1995-02-17

1998-05-05

Sikes, William L.

Liquid crystal cells, elements and systems

With specified nonchemical characteristic of liquid crystal...

Utilizing change within liquid crystal phase

349179, 345 95, 345210, C09K 1902, G09G 336, G09G 500

Patent

active

057482772

ABSTRACT:
A flat-panel liquid crystal display. The display includes a flat sheet of bistable chiral nematic liquid crystal material activated by a drive circuit that individually controls the display state of multiple picture elements at a refresh rate 1000 scan lines per second. The driver circuitry activates the liquid crystal domains into homeotropic states over a relatively long activation period and then, during a short (.about.1 msec.) selection period, either keeps the domains in a homeotropic state or initiate a transition to the transient twisted planar state. The drivers then activate the domains in an evolution phase to provide either focal conic or twisted planar end states across the two-dimensional array of picture elements.

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