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Light redirecting films including intersecting optical elements with flat and curved surfaces

  • US 8,398,274 B2
  • Filed: 03/17/2010
  • Issued: 03/19/2013
  • 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 light entrance surface for receiving light from a light source and an opposite light exit surface, at least one of the surfaces having a pattern of individual optical elements of well defined shape having at least one flat surface and at least one curved surface and being quite small relative to the length and width of the substrate to redistribute light passing through the substrate in a predetermined angular distribution, wherein at least some of the optical elements intersect each other over an intersection volume of the intersecting optical elements.

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