Patent ID: 8792165

Claim:
A multilayer optical film, comprising: a plurality of interior microlayers arranged to selectively reflect light by constructive or destructive interference, the microlayers extending from a first zone to a neighboring second zone of the film; wherein in the first zone the plurality of interior microlayers provides a first reflective characteristic and in the second zone the plurality of interior microlayers provides a second reflective characteristic different from the first reflective characteristic; wherein the plurality of interior microlayers comprises a first set of microlayers that are birefringent in the first zone and less birefringent or isotropic in the second zone, the first set of microlayers comprising a first material; and wherein the plurality of interior microlayers comprises a second set of microlayers that are birefringent in the first zone, the second set of microlayers comprising a second material different from the first material.