Patent ID: 8836870

Claim:
A pair of glasses for viewing three-dimensional (3D) image content, comprising a glasses frame and two lenses, at least one of the two lenses comprising a polarizer and a polarization conversion unit in front of the polarizer, wherein the polarization conversion unit is adapted to adjust a polarization direction of an incoming image beam to a polarization direction that is either parallel or perpendicular to a polarization axis direction of the polarizer, wherein said polarization conversion unit comprises a first liquid crystal layer and a second liquid crystal layer, wherein a magnitude of an operating voltage supplied to said first liquid crystal layer controls an extent of adjustment of the polarization direction of the incoming image beam, and wherein said second liquid crystal layer is disposed between the first liquid crystal layer and the polarizer and is adapted to maintain the polarization direction of the incoming image beam passing through the first liquid crystal layer or to convert the polarization direction of the incoming image beam passing through the first liquid crystal layer to a perpendicular polarization direction.