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Method and system of LED light extraction using optical elements

  • US 7,360,936 B2
  • Filed: 09/22/2006
  • Issued: 04/22/2008
  • Est. Priority Date: 06/10/2003
  • Status: Expired due to Fees
First Claim
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1. An LED light extraction system, comprising:

  • an extraction plate adapted to be bonded to a light-emitting surface of the an LED, the extraction plate including a plurality of optical elements arranged to receive and pass light emitted from the LED, the optical elements outputting collimated LED light that is more collimated than the LED-emitted light received by the optical elements; and

    a partially reflective layer between the light emitting surface of the LED and the optical elements, for passing a portion of the LED-emitted light into the optical elements and reflecting a portion of the LED-emitted light back into the LED;

    wherein the optical elements have a refractive index that is greater than or equal to the refractive index of the LED semiconductor material.

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