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Optical film with sharpened bandedge

  • US 6,157,490 A
  • Filed: 01/13/1998
  • Issued: 12/05/2000
  • Est. Priority Date: 01/13/1998
  • Status: Expired due to Term
First Claim
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1. A reflective film comprising:

  • one or more first regions having a first plurality of optical repeating units arranged to have a first continuously varying optical thickness gradient that substantially defines a first reflection band of the reflective film, one or more second regions having a second plurality of optical repeating units arranged to have a second continuously varying optical thickness gradient that substantially defines a second reflection band of the reflective film, and a third region having a third plurality of optical repeating units arranged to have a third continuously varying optical thickness gradient that varies differently from the first gradient and that substantially defines a first bandedge slope of the first reflection band.

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