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Large screen video display systems and methods therefor

  • US 4,003,080 A
  • Filed: 06/02/1975
  • Issued: 01/11/1977
  • Est. Priority Date: 06/02/1975
  • Status: Expired due to Term
First Claim
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1. A large area, flat screen, display system for video signal information comprising:

  • large area, flat, rear projection screen means;

    means disposed adjacent said screen means for generating a small diameter, collimated beam of light;

    beam modulating means disposed in the path of the beam for modulating the beam in response to video signals while maintaining the beam diameter and collimation;

    beam scanning means positioned adjacent said screen means and in the path of said beam subsequent to the beam modulating means for scanning said beam through a display raster within an expanding beam envelope; and

    optical path folding means comprising spaced apart reflecting elements mounted rearwardly of and adjacent to said screen means and positioned to establish a path for the expanding beam envelope that traverses behind said screen means in at least two path segments, the final path segment directing the beam against said projection screen means with substantially varying angles and throw distances within the envelope.

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