Liquid crystal cells – elements and systems – Particular structure – Having significant detail of cell structure only
Patent
1997-07-28
2000-04-04
Sikes, William L.
Liquid crystal cells, elements and systems
Particular structure
Having significant detail of cell structure only
349 96, 349117, 349121, G02F 11335
Patent
active
06046786&
ABSTRACT:
This invention provides achromatic liquid crystal compound retarders, achromatic polarization switches, and achromatic shutters using the liquid crystal compound retarders. It further provides achromatic variable retardance smectic liquid crystal retarders. The compound retarder of this invention comprises a central liquid crystal retarder unit and two external passive retarders positioned in series with and on either side of the liquid crystal retarder unit. The liquid crystal retarder unit comprises either (1) a rotatable smectic liquid crystal half-wave retarder or (2) first and second liquid crystal variable retarders having retardance switchable between zero and half-wave. The external passive retarders are equal in retardance and orientation to each other. Design equations determine the retardance of the external elements and their orientation relative to the central retarder to obtain a particular achromatic retardance for the compound structure.
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Johnson Kristina M.
Sharp Gary D.
Chowdhury Tarifur R.
Sikes William L.
University Technology Corporation
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