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Liquid crystal display for projection systems

  • US 4,763,993 A
  • Filed: 04/30/1987
  • Issued: 08/16/1988
  • Est. Priority Date: 04/30/1987
  • Status: Expired due to Fees
First Claim
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1. An apparatus for use in conjunction with a means for projecting a beam of light along an optical path onto a surface, said apparatus, responsive to a means for generating display images, for generating liquid crystal display images on a screen when inserted into said optical path, said means for projecting including a light source, said apparatus comprising:

  • control means, responsive to said generating means, for generating crystal means energizing signals;

    twisted nematic crystal means for controlling polarization of light passing therethrough in response to localized energization and de-energization of said crystal means;

    means, responsive to said control means signals, for locally energizing said crystal means;

    back polarizing means, disposed in said beam and located between said crystal means and said light source, for polarizing light passing therethrough;

    front analyzing means, located between said crystal means and said surface, for allowing light of a selected polarizing to pass therethrough and for blocking light not having said selected polarization; and

    visible light transparent insulation means disposed in said beam and located between said light source and said crystal means.

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