Patent ID: 9291757
Filing Date: 2016-03-22
CPC Classification: B42D,G02B,G02F,Y10T

Claim Text:
1. An optical film comprising: a combination of substantially orthogonally oriented reflective polarizers that are both formed from a same plurality of layers, the plurality of layers arranged to selectively reflect light by constructive or destructive interference, wherein the plurality of layers comprises a first set of layers that are birefringent in one or more first zones of the optical film corresponding to a first reflective polarizer, and the first set of layers has a reduced or eliminated birefringence in one or more second zones of the optical film relative to its birefringence in the one or more first zones, the first and second zones being adjacent with each and the plurality of layers extending from the first zones to the second zones, the one or more second zones of the optical film corresponding to a second reflective polarizer that is substantially orthogonally oriented relative to the first reflective polarizer, wherein the reduced or eliminated birefringence of the first set of layers in the second zones relative to the first zones causes the second reflective polarizer to be substantially orthogonally oriented relative to the first reflective polarizer, and wherein the plurality of layers has substantially the same thickness in the one or more first zones and the one or more second zones.