Post-formable multilayer optical films and methods of forming
Assignee3M Innovative Properties Company
InventorsWilliam W. Merrill, James M. Jonza, Olester Benson, Jr., Andrew J. Ouderkirk, Michael F. Weber
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Abstract
Articles including post-formed multilayer optical films with layers of at least one strain-induced birefringent material, methods of manufacturing such articles by post-forming multilayer optical films, and multilayer optical films that are particularly well-suited to post-forming operations are disclosed. The articles, methods and multilayer optical films of the present invention allow for post-forming of multilayer optical films including strain-induced index of refraction differentials while retaining the desired optical properties of the multilayer optical films.
Claims15
An article comprising multilayer optical film comprising an optical stack comprising a plurality of layers, the layers comprising at least one birefringent polymer and at least one second polymer, wherein the optical stack comprises a strain-induced index of refraction differential between layers in the optical stack along a first in-plane axis, wherein the optical stack further comprises a strain-induced index of refraction differential along a second in-plane axis that is perpendicular to the first in-plane axis, and further wherein the optical stack defines first and second major surfaces, the first major surface including at least one depressed area formed therein.
An article comprising a multilayer optical film comprising an optical stack comprising a plurality of layers, the layers comprising at least one birefringent polymer and at least one second polymer, the multilayer optical film comprising at least a first and second reflective portion wherein the second reflective portion is thinned relative to the first reflective portion, wherein the first and second reflective portions reflect normally incident light in a first and second wavelength range respectively that differ from each other but that overlay at least in a wavelength range of interest, wherein the optical stack comprises a strain-induced index of refraction differential between layers in the optical stack along a first in-plane axis, and further wherein the optical stack defines first and second major surfaces, the first major surface including a depressed area formed therein at the second reflective portion.
Dependencies are inferred from the claim text.