Optical film and polarizing beam splitter
Assignee3M Innovative Properties Company
InventorsZhisheng Yun, Timothy J. Nevitt, John D. Le, Susan L. Kent
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Abstract
Optical films and polarizing beam splitters including the optical films are described. In some cases, the optical film includes a first optical stack disposed on, and spaced apart by one or more spacer layers from, a second optical stack, each optical stack comprising a plurality of polymeric interference layers reflecting and transmitting light primarily by optical interference in a same predetermined wavelength range. Each optical stack has interference layers closer to the one or more spacer layers that reflect longer wavelengths and interference layers farther from the one or more spacer layers that reflect shorter wavelengths.
Claims6
An optical film comprising a plurality of stacked first polymeric interference layers disposed on a plurality of stacked second polymeric interference layers, each first and second interference layers reflecting or transmitting light primarily by optical interference for at least one wavelength in a same predetermined wavelength range extending at least from 450 to 600 nm, an outermost first interference layer being the first interference layer farthest from the plurality of stacked second interference layers, an outermost second interference layer being the second interference layer farthest from the plurality of stacked first interference layers, the outermost first and second interference layers having optical thicknesses equal to one quarter of respective first and second wavelengths in the predetermined wavelength range, a difference between the first and second wavelengths being less than about 40 nm.
Dependencies are inferred from the claim text.