초록 ▼

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 dis

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.

대표청구항 ▼

1. 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 different polymer, wherein the optical stack comprises a strain-induced index of refraction differential along a f

1. 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 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; and wherein the birefringent polymer is a polyester. 2. The article of claim 1, wherein the thickness of the optical stack varies by at least about 20% or more. 3. The article of claim 1, wherein substantially the entire optical stack reflects at least about 90% of light of desired wavelengths that is polarized along the first in-plane axis. 4. The article of claim 1, 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. 5. The article of claim 1, wherein the optical stack further comprises a first major surface, the first major surface comprising at least one depressed area formed thereon. 6. The article of claim 1, further comprising a rigid substrate attached to the multilayer optical film.