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Exposure system for creating a patterned polarization compensator

  • US 6,982,773 B2
  • Filed: 02/01/2005
  • Issued: 01/03/2006
  • Est. Priority Date: 01/07/2002
  • Status: Expired due to Term
First Claim
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1. An exposure system for creating a patterned polarization compensator comprising:

  • (a) a light source for providing an incident beam of light;

    (b) polarization optics including at a polarization beamsplitter, for transmitting light of said beam of light having a first polarization, and for reflecting light of said beam of light having a second polarization orthogonal to said first polarization;

    (c) a polarization based reflective spatial light modulator having an undesired spatial retardance variation;

    wherein said modulator receives said polarized beam of light, having either a first polarization or a second polarization, and selectively modulates said polarized beam of light to encode data thereon, providing both modulated light and unmodulated light which differ in polarization;

    (d) wherein said reflective spatial light modulator reflects back both said modulated light and said unmodulated light to said polarization beamsplitter;

    (e) an imaging lens which uses said modulated light to create an image of said reflective spatial light modulator onto a light-sensitive material; and

    (f) wherein said light-sensitive material is exposed and patterned with variations that correlate with said undesired spatial retardance variation of said polarization based reflective spatial light modulator, thereby facilitating the fabrication of a patterned polarization compensator.

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