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Light redirecting films pattern of variable optical elements

  • US 7,364,342 B2
  • Filed: 07/11/2006
  • Issued: 04/29/2008
  • Est. Priority Date: 02/23/1999
  • Status: Expired due to Fees
First Claim
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1. A light redirecting film comprising a thin optically transparent substrate having a pattern of individual optical elements of well defined shape on or in the substrate, the optical elements being quite small in relation to a width and length of the substrate, at least some of the optical elements varying at different locations on the substrate to redistribute light passing through the substrate toward a direction normal to the substrate, wherein the substrate has multiple layers and at least some of the multiple layers have different indices of refraction.

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