Patent ID: 7510748

Claim:
A broadband brightness enhancement polarizer, comprising: (a) a cholesteric liquid crystal film laminate having a broadband selective reflecting wavelength range in which a plurality of cholesteric liquid crystal films having selective reflecting wavelength ranges different from each other by having different mixture ratios of a curable nematic liquid crystal compound expressed by the following chemical formula 1 and a curable chiral compound expressed by the following chemical formula 2 are laminated; and where, in the chemical formula 1, S is a spacer selected from the group consisting of (CH 2 ) m , (CH 2 CH 2 O) n CH 2 CH 2 and CH 2 CH 2 NHCH 2 CH 2 (m is an integer of 1 to 12, and n is an integer of 1 to 3), and M is a Mesogen group selected from the group consisting of: where, in the chemical formula 2, S is a spacer selected from the group consisting of (CH 2 ) m , (CH 2 CH 2 O) n CH 2 CH 2 and CH 2 CH 2 NHCH 2 CH 2 (m is an integer of 1 to 12, and n is an integer of 1 to 3), and M is a Mesogen group selected from the group consisting of: where C is a chiral group selected from the group consisting of: (b) a film having Â¼Î» phase difference laminated on one surface of the cholesteric liquid crystal film laminate.