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Directional flat illuminators

  • US 20120127573A1
  • Filed: 11/18/2011
  • Published: 05/24/2012
  • Est. Priority Date: 11/19/2010
  • Status: Active Grant
First Claim
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1. A method for guiding light by employing an optical valve, comprising:

  • allowing light rays to propagate in a first direction through the optical valve, wherein the light propagates in the first direction with substantially low loss;

    allowing the light rays to interact with an end surface of the optical valve; and

    allowing the light rays to propagate in a second direction through the optical valve, wherein at least some of the light rays encounter at least one extraction feature and are extracted from the optical valve.

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