Liquid crystal cells – elements and systems – With specified nonchemical characteristic of liquid crystal... – Utilizing change within liquid crystal phase
Reexamination Certificate
2011-06-07
2011-06-07
Dudek, James A (Department: 2871)
Liquid crystal cells, elements and systems
With specified nonchemical characteristic of liquid crystal...
Utilizing change within liquid crystal phase
Reexamination Certificate
active
07956980
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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N. Nagae et al, “A Novel Method for High Speed Transition From Splay to Bend Alignment in the OCD-Mode LCD With Fast Response” Conference Record of the 20thInternational Display Research Conference, Sep. 2000, pp. 26-29.
P.J. Bos et al, “The Pi-Cell: A Fast Liquid-Crystal Optical-Switching Device” Molecular Crystals and Liquid Crystals (Inc. Nonlinear Optics), vol. 113, No. 1-4, pp. 329-339.
Dudek James A
Nixon & Vanderhye P.C.
ZBD Displays Limited
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