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Microlens imbedded liquid crystal projection panel including thermal insulation layer

  • US 5,815,229 A
  • Filed: 08/22/1996
  • Issued: 09/29/1998
  • Est. Priority Date: 11/21/1994
  • Status: Expired due to Term
First Claim
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1. A liquid crystal projection panel construction, comprising:

  • liquid crystal assembly means being disposed between said glass substrate to form said panel construction, and including a liquid crystal material for modulating light to generate an image to be projected;

    a light exiting glass substrate;

    an incident light glass substrate;

    said light exiting glass substrate including a plurality of pixel elements for controlling said liquid crystal material;

    said incident light glass substrate spaced apart from said light exiting glass substrate for enclosing said liquid crystal assembly means therebetween to form said panel construction, wherein said liquid crystal assembly means and said incident light glass substrate abut at a surface of engagement;

    said incident light glass substrate including microlens means having a plurality of lenslets disposed closely spaced by a given optical distance relative to said pixel elements and in registration therewith for focusing light through said pixel elements to enable substantially all of the light to be used for generating said image;

    an optical assembly being thin as compared to the thickness of said incident light glass substrate and being disposed between said liquid crystal assembly means and said microlens means at about a surface of engagement with said liquid crystal assembly means for determining the focal distance by spacing said microlens means from said liquid crystal assembly means;

    said optical assembly includes a plurality of individual interface filters corresponding to said lenslets and pixel elements and aligned in registration therewith for passing selectively incident light therethrough to facilitate the generation of a full color image, at least one neutral density layer disposed between said lenslets and said surface for adjusting said focal distance, and an insulation layer disposed between the neutral density layer and the lenslets to reduce the amount of heat produced by the interaction of the light with said filters; and

    whereby the occurrence of optical cross talk between adjacent lenslets is substantially reduced.

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