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Optical film

  • US 6,117,530 A
  • Filed: 09/02/1998
  • Issued: 09/12/2000
  • Est. Priority Date: 12/21/1993
  • Status: Expired due to Term
First Claim
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1. A film, comprising:

  • a plurality of layers;

    wherein at least two of the plurality of layers exhibit a refractive index difference between the layers along at least one in-plane axis that is greater than a refractive index difference between the layers along an out-of-plane axis;

    and further wherein the film has an average reflectivity of at least 60% for light within an intended bandwidth incident at 60°

    from normal to the plane of the film said light being polarized in a plane defined by the at least one in-plane axis and the out-of-plane axis.

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