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BACKLIGHT

  • US 20110051460A1
  • Filed: 09/03/2009
  • Published: 03/03/2011
  • Est. Priority Date: 09/03/2009
  • Status: Active Grant
First Claim
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1. A backlight system, comprising:

  • a lightguide for transferring light by total internal reflection;

    at least one prism layer having an array of prism structures; and

    an extraction feature structure for extracting light from a face of the lightguide towards the at least one prism layer in one or more preferential directions which are away from normal to the lightguide, wherein each of the one or more preferential directions is specific to a corresponding acceptance angle of the prism structures to produce collimated emission of the extracted light from the at least one prism layer.

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