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LCD backlight with UV light-emitting diodes and planar reactive element

  • US 7,036,946 B1
  • Filed: 09/13/2002
  • Issued: 05/02/2006
  • Est. Priority Date: 09/13/2002
  • Status: Expired due to Term
First Claim
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1. A backlight for a liquid crystal display (LCD), comprising:

  • a substantially planar waveguide;

    a plurality of light-emitting diodes positioned adjacent the waveguide, the plurality of light-emitting diodes emitting light having a first wavelength range; and

    a substantially planar reactive element disposed adjacent the waveguide, the reactive element being configured to emit light having a second wavelength range toward the waveguide when the reactive element is excited by light from the plurality of light-emitting diodes;

    wherein the plurality of light-emitting diodes is a first plurality of light-emitting diodes positioned along an edge of the waveguide that is substantially parallel to a light output direction of the backlight, and further including a second plurality of light-emitting diodes positioned along the edge of the waveguide, the second plurality of light-emitting diodes emitting visible light.

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