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Assignee3M Innovative Properties Company
InventorsJohn D. Le, Timothy L. Wong, Benjamin G. Sonnek, Kayla A. McGrath, David J.W. Aastuen
Estimating the term…
An optical film includes a first optical stack disposed on a visible light absorbing second optical stack. Each of the first and second optical stacks includes a plurality of alternating polymeric first and second layers. The first layers have a higher index of refraction than the second layers at least along an in-plane same first direction. For substantially normally incident light and for at least 80% of wavelengths in a visible wavelength range, the plurality of alternating polymeric first and second layers for at least the first optical stack reflects more than about 60% of the incident light polarized along the first direction and transmits more than about 45% of the incident light polarized along an in-plane orthogonal second direction, and at least the first layers of the second optical stack are more light absorbing for the incident light polarized along the first direction than the second direction.
An optical film comprising a first optical stack disposed on, and spaced apart by one or more spacer layers from, a visible light absorbing second optical stack, each of the first and second optical stacks comprising a plurality of polymeric layers, each of the polymeric layers having an average thickness of less than about 500 nm, such that for an incident light propagating in an incident plane comprising a second direction, for each wavelength in a visible wavelength range extending from about 420 nm to about 680 nm, and for substantially normal incidence:
Dependencies are inferred from the claim text.