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Light directing film

  • US 10,379,268 B2
  • Filed: 05/05/2016
  • Issued: 08/13/2019
  • Est. Priority Date: 06/09/2005
  • Status: Active Grant
First Claim
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1. A light directing film comprising a first structured major surface, a second major surface opposite to the first structured major surface and a reference plane between the first structured major surface and the second major surface, wherein the reference plane is substantially perpendicular to the thickness direction of the light directing film, wherein the first structured major surface comprises a first prism and a second prism each of which extends substantially along a first direction, wherein a first ridge of the first prism has a first height relative to the reference plane and a second ridge of the second prism has a second height relative to the reference plane, wherein the first height of the first ridge of the first prism varies along the first direction and the second height of the second ridge of the second prism varies along the first direction, wherein the minimum of the first height is larger than the maximum of the second height.

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