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Illumination device with built-in light coupler

  • US 8,061,882 B2
  • Filed: 04/01/2009
  • Issued: 11/22/2011
  • Est. Priority Date: 10/06/2006
  • Status: Expired due to Fees
First Claim
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1. An illumination device comprising:

  • a light guide including;

    a front surface exposed to ambient light;

    a back surface;

    a light coupling section including a diffraction grating, said light coupling section disposed at least partially between said front surface and said back surface, said light coupling section configured to receive optical energy through said back surface at an angle about normal to said back surface, said diffraction grating configured to direct light through said light guide; and

    a light turning section configured to redirect at least a portion of the light received from said light coupling section out of said back surface, said redirected light being emitted from said back surface at an angle about normal to said back surface; and

    a light source disposed to provide optical energy to said back surface of said light coupling section at an angle about normal to said back surface,wherein said light guide is a film stack or said light guide has a film applied directly thereto.

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