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LED-based high efficiency illumination systems for use in projection systems

  • US 20070263298A1
  • Filed: 08/09/2006
  • Published: 11/15/2007
  • Est. Priority Date: 05/09/2006
  • Status: Active Grant
First Claim
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1. An etendue folding illumination system for illuminating a target etendue comprising:

  • a folded collimator/concentrator having an input aperture defining an input aperture area, and an output aperture, the folded collimator/concentrator also having a reflective inner surface and an output aperture stop defining an output clear aperture at least partially surrounded by a reflective aperture stop;

    at least part of the input aperture area being coupled to a light source having a plurality of light emitting diode (LED) dies of one or multiple colors providing light flux into the folded collimator/concentrator, at least part of the area of the input aperture being reflective;

    the output clear aperture having collimation angle, area and aspect ratio characteristics matching corresponding parameters of the target etendue.

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