Diffuse reflective optical films with spatially selective birefringence reduction

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United States of America Patent

PATENT NO 9939560
SERIAL NO

13703518

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Abstract

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A diffusely reflective optical film includes a blended layer extending from a first to a second zone of the film. The blended layer includes first and second polymer materials separated into distinct first and second phases, respectively. The blended layer may have the same composition and thickness in the first and second zones, but different first and second diffusely reflective characteristics in the first and second zones, respectively. The difference between the first and second diffusely reflective characteristics may not be attributable to any difference in composition or thickness of the layer between the first and second zones. Instead, the difference between the first and second diffusely reflective characteristic may be attributable to a difference in birefringence of the first and/or second polymer materials between the first and second zones. The blend morphology of the blended layer may be substantially the same in the first and second zones.

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Patent Owner(s)

  • 3M INNOVATIVE PROPERTIES COMPANY

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Merrill, William Ward White Bear Lake, US 44 1227

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