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Liquid crystal achromatic compound retarder

  • US 5,658,490 A
  • Filed: 04/07/1995
  • Issued: 08/19/1997
  • Est. Priority Date: 04/07/1995
  • Status: Expired due to Term
First Claim
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1. A liquid crystal achromatic compound retarder, comprising:

  • a first passive retarder having retardance Γ

    10 at a design wavelength, and orientation α

    1 ; and

    a second passive retarder having retardance Γ

    10 at said design wavelength, and orientation α

    1 ; and

    a liquid crystal retarder unit, positioned between said first and second retarders, said retarder unit having composite retardance π

    at said design wavelength and having composite orientation electronically switchable between α

    2, in a first state, and α

    2 '"'"', in a second state;

    wherein α

    1 and α

    2 are such that said compound retarder is achromatic in said first state.

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