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Large area electronic writing system

  • US 5,495,269 A
  • Filed: 04/03/1992
  • Issued: 02/27/1996
  • Est. Priority Date: 04/03/1992
  • Status: Expired due to Term
First Claim
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1. A large area electronic writing system, comprising:

  • a parallax reducing display screen with a light dispersive imaging surface;

    means for projecting a modifiable light spot representing input location information upon one side of said imaging surface;

    means for sensing said light spot and for generating output signals representative of said input location information, said means for sensing being located on a second side of said imaging surface and comprising;

    a large aperture imaging lens, said aperture corresponding to f1.0 or less; and

    a position sensing integrating detector, said large aperture imaging lens focusing energy from substantially the entire imaging surface upon said position sensing integrating detector; and

    rear-projection means for displaying information upon said second side of said imaging surface, whereby said displayed information indicates an accurate pixel location corresponding to said light spot input location information.

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