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Ultra-thin backlight

  • US 7,338,197 B2
  • Filed: 12/05/2005
  • Issued: 03/04/2008
  • Est. Priority Date: 05/16/2001
  • Status: Expired due to Fees
First Claim
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1. A flat illumination device (FID), having at least one illumination window defined over at least one plane, comprising:

  • A light guiding plate having at least a front and a back face and at least one edge, said illumination window being outside said light guiding plate;

    at least one light source, each said light source disposed so as to couple a respective input luminous flux from the light source into a corresponding edge;

    each input luminous flux forming a corresponding internal flux component which propagates through said light guiding plate by total internal reflection;

    wherein at least one of said faces is a flux extracting face, which has a pattern of flux extracting elements collecting and extracting said internal flux from all said light sources simultaneously and distributed thereon covering a varying fraction of any elementary area of said flux extracting face in a non-uniform pattern that is substantially a two-dimensional, non-monotonic irregular function of the distance of a point within said elementary area to any point lying on the perimeter of said light guiding plate.

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