Patent ID: 8023080
Filing Date: 2011-09-20
Classification: G02B,G02F

Abstract:
1. A brightness enhanced polarizing optical element, comprising: a reflective polarizer film; a phase retardation film formed of liquid crystal directly on said reflective polarizer film, said phase retardation film having a top surface and a bottom surface and the directors of LC molecules inside the phase retardation film are twisted an angle layer by layer, from the one surface to the other surface and its twist handness is reversely to the helix handness of said reflective polarizer film; and a polarization enhancement film formed directly on said phase retardation film and said polarization enhancement film having a uppermost optical transmitting axis and a lowermost optical transmitting axis and said uppermost optical transmitting axis being significantly the same as optical axis of said brightness enhanced polarizing optical element, wherein said uppermost transmitting optical axis and said lowermost optical transmitting axis has a ratio of transmittance at least larger than 5.