Liquid crystal achromatic compound retarder

Details Liquid crystal achromatic compound retarder Liquid crystal achromatic compound retarder

1995-04-07

1997-08-19

Harris, Cynthia

Compositions

Liquid crystal compositions

349 96, 349117, C09K 1952, G07F 113

Patent

active

056584903

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.

REFERENCES:
patent: 4967268 (1990-10-01), Lipton et al.
patent: 5020882 (1991-06-01), Makow
patent: 5117302 (1992-05-01), Lipton et al.
patent: 5122890 (1992-06-01), Makow

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