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Projection screen having electric field responsive reflectance layer and a photosensitive material

  • US 6,538,814 B2
  • Filed: 03/22/2001
  • Issued: 03/25/2003
  • Est. Priority Date: 03/22/2000
  • Status: Expired due to Fees
First Claim
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1. A projection screen for reflecting from a first side a projected image with enhanced contrast, comprising:

  • an active layer whose reflectance can be changed under the influence of an electric field;

    at least a first electrode for applying an electric field across the active layer; and

    a photosensitive material whose electrical or dielectric properties can be changed under illumination, wherein the photosensitive material is arranged such that the electrical field across local regions of the active layer is dependent on the illumination incident upon the photosensitive material in each such local region with the result that reflectance of the active layer is locally dependent upon an intensity of light incident upon the first side of the projection screen in that local region.

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