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Methods for manipulating light extraction from a light guide

  • US 7,277,609 B2
  • Filed: 11/04/2005
  • Issued: 10/02/2007
  • Est. Priority Date: 11/05/2004
  • Status: Active Grant
First Claim
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1. A method of defining an array of extractor elements configured to extract light from a light guide, thereby producing a desired spatial light pattern ET quantifying optical output at a plurality of locations across the light guide, the method comprising:

  • (a) calculating a first spatial light pattern produced by a first array of extractor elements, the first spatial light pattern quantifying optical output at the plurality of locations across the light guide;

    (b) determining a ratio R of the optical output of the desired spatial light pattern to an optical output of the first spatial light pattern;

    (c) determining a modified ratio R′

    , wherein R′

    =Rα

    and |α

    |<

    1; and

    (d) determining a characteristic of a second array of extractor elements by scaling a characteristic of the first array of extractor elements by the modified ratio R′

    .

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