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BRIGHTNESS ENHANCEMENT FILM USING LIGHT CONCENTRATOR ARRAY

  • US 20070047260A1
  • Filed: 10/20/2006
  • Published: 03/01/2007
  • Est. Priority Date: 02/24/2004
  • Status: Abandoned Application
First Claim
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1. An illumination system comprising:

  • (a) a light guiding plate for providing a generally Lambertian light source and (b) a brightness enhancement film comprising an array of tapered structures extending from the light input to the light output surface of the film, each said tapered structure having a light input aperture and a larger light output aperture, wherein the inner surface of each said tapered structure is adapted to reflect off-axis light incident at said input aperture to said output aperture in which said array of tapered structures comprises an array of concentrators extending between an input aperture on the input surface and an output aperture on the output surface, each said concentrator having a generally parabolic shape taken from said light input aperture to said light output aperture.

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