POST-FORMABLE MULTILAYER OPTICAL FILMS AND METHODS OF FORMING
First Claim
1. 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 different polymer, wherein the optical stack comprises a strain-induced index of refraction differential along a first in-plane axis and substantially the entire optical stack reflects at least about 85% of light of desired wavelengths that is polarized along the first in-plane axis, and further wherein the thickness of the optical stack varies by at least about 10% or more.
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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.
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6 Claims
- 1. 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 different polymer, wherein the optical stack comprises a strain-induced index of refraction differential along a first in-plane axis and substantially the entire optical stack reflects at least about 85% of light of desired wavelengths that is polarized along the first in-plane axis, and further wherein the thickness of the optical stack varies by at least about 10% or more.
Specification