Liquid crystal device with bi- or multistable alignment gratings
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United States of America Patent
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Jun 7, 2011
Grant Date -
Jan 31, 2008
app pub date -
Jul 17, 2007
filing date -
May 29, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A liquid crystal device is described that comprises a layer of liquid crystal material contained between a first cell wall and a second cell wall. The layer of liquid crystal material being switchable between at least a first state and a second state, said first state and said second state having sufficiently low splay to enable rapid electrical switching therebetween. The internal surface of said first cell wall is arranged to provide two or more surface alignment configurations of different pretilt to said layer of liquid crystal material. Said states may persist in the absence of an applied electric field. In particular, the invention relates to pi-cell devices that allow for rapid switching from the initial splay state to the bend states, and also to bistable or multistable pi-cell devices.
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