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Optical film

  • US 7,891,856 B2
  • Filed: 08/24/2007
  • Issued: 02/22/2011
  • Est. Priority Date: 08/28/2006
  • Status: Active Grant
First Claim
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1. An optical film, comprising:

  • a plastic substrate, anda structured surface layer, positioned on one side of the substrate,wherein the structured surface layer has an irregular brightness enhancing structure that comprises a plurality of non-parallel, adjacent columnar structures, wherein the plurality of non-parallel, adjacent columnar structures a set of two non-parallel, crossed columnar structures and a set of two non-parallel, non-crossed columnar structures.

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