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Projection display device

  • US 4,249,796 A
  • Filed: 06/21/1979
  • Issued: 02/10/1981
  • Est. Priority Date: 06/21/1979
  • Status: Expired due to Term
First Claim
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1. A projection display device comprising:

  • (a) a prism having a base;

    (b) a thin film of material having a negative dielectric constant and having one side in optical contact with the base of said prism, and a second side;

    (c) a medium of variable refractive index in contact with said second side of said film;

    (d) means to pass a beam of light which is plane polarized in the plane of incidence onto the base of said prism at an angle to excite a surface electromagnetic wave at the interface between said medium and said film; and

    (e) means to vary the refractive index of said medium.

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