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Color selective light modulators employing birefringent stacks

  • US 5,990,996 A
  • Filed: 05/09/1997
  • Issued: 11/23/1999
  • Est. Priority Date: 05/14/1996
  • Status: Expired due to Term
First Claim
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1. A device for manipulating at least partially polarized light, comprising;

  • a retarder stack comprising at least two retarders, wherein at least one of the retarders in the retarder stack comprises a first retarder that has a first orientation and a first retardance, wherein said retarder stack receives said at least partially polarized light as input light and transforms said input light into transformed light having at least a first portion with a predetermined first spectrum and a first polarization and a second portion with a predetermined second spectrum and a second polarization;

    a modulator that receives at least some of said transformed light and outputs intermediate light, wherein said modulator is adapted to modulate said first portion of transformed light more than said second portion of transformed light; and

    at least a second retarder having a second orientation and a second retardance that receives and transforms at least some of said intermediate light into output light.

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