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LCD display backlight system with improved color mixing and efficiency

  • US 20070053178A1
  • Filed: 09/06/2006
  • Published: 03/08/2007
  • Est. Priority Date: 09/06/2005
  • Status: Active Grant
First Claim
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1. A LCD display backlight system, comprising:

  • a reflective surface;

    a plurality of light sources mounted on said reflective surface;

    a plurality of fractional wave plates mounted on spaces between said plurality of light sources on said reflective surface; and

    a reflective polarizer for transmitting light having a useable polarization and reflecting back unused polarization of light onto said reflective surface; and

    wherein a portion of said unused polarization of light reflected from said reflective polarizer passes through a fractional wave plate and said reflective surface reflects said portion of said unused polarization of light through said fractional wave plate such that the polarization of said unused polarization of light is changed to useable polarization, thereby recycling said unused polarization of light into useful light.

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