Patent ID: 8310757
Filing Date: 2012-11-13
Classification: G02B

Abstract:
1. A light transmissive panel comprising: a first sheet comprising a first non-birefringent substrate, a first standard linear polarizer layer over the first substrate wherein the entire first polarizer layer comprises a single standard linear polarizer, and a first wave retarder layer over the first polarizer layer wherein the first wave retarder rotates light by a first amount; and a second sheet comprising a second non-birefringent substrate, a second standard linear polarizer layer over the second substrate wherein the entire second polarizer layer comprises a single standard linear polarizer, and a second wave retarder layer over the second polarizer layer wherein the second wave retarder rotates light by a second amount; said first and second sheets being mechanically translatable relative to each other, said mechanical translation controlling transmission of light through said light transmissive panel, wherein the first and second wave retarder layers are located between the first and second standard linear polarizer layers, wherein the first standard linear polarizer layer defines a first plane and the first wave retarder layer has a thickness varying in a direction perpendicular to the first plane, and wherein the second standard linear polarizer layer defines a second plane and the second wave retarder layer has a thickness varying in a direction perpendicular to the second plane.