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Optical film with sharpened bandedge

  • US 20050243425A1
  • Filed: 07/01/2005
  • Published: 11/03/2005
  • Est. Priority Date: 01/13/1998
  • Status: Abandoned Application
First Claim
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1. A reflective film comprising a plurality of optical repeating units having an optical thickness profile that defines a curve, the curve having substantially no discontinuities in its first derivative and shaped so that it, in order, monotonically decreases from an initial optical thickness to a minimum optical thickness, remains substantially constant at the minimum optical thickness, monotonically increases from the minimum optical thickness to a maximum optical thickness, remains substantially constant at the maximum optical thickness, and monotonically decreases from the maximum optical thickness to an end optical thickness, wherein the optical repeating units monotonically increasing from the minimum optical thickness to the maximum optical thickness form a reflection band.

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