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Brightness enhancement film with soft cutoff

  • US 5,917,664 A
  • Filed: 02/05/1996
  • Issued: 06/29/1999
  • Est. Priority Date: 02/05/1996
  • Status: Expired due to Term
First Claim
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1. A film for enhancing the apparent on axis brightness of a light source said film comprising first and second surfaces, said first surface being a structured surface having a plurality of linear prisms thereon, said prisms being disposed in side by side pairs, each pair having first and second prisms, and each prism having a prism angle and a valley angle wherein either said prism angles or said valley angles of each pair but not both are equal.

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