Patent ID: 6717642
Filing Date: 2004-04-06
Classification: G02B,G02F

Abstract:
A wide viewing angle polarizer comprising:a polarizing film; and a phase retarder adhesively laminated on at least one surface of said polarizing film through an adhesive layer, said phase retarder being made of a composite phase retarder constituted by a laminate in which a second retardation layer of a cholesteric liquid crystal-oriented solidified layer in a selective reflection wavelength range of not larger than 350 nm is supported by a first retardation layer of a thermoplastic resin exhibiting positive birefringence, said composite phase retarder being formed so that said laminate has Re of not smaller than 10 nm and Rthâˆ’Re of not smaller than 50 nm on the basis of light at a wavelength of 590 nm when Re and Rth are defined as Re=(nxâˆ’ny)X d and Rth=(nxâˆ’nz)X d respectively in which nx and ny are in-plane main refractive indices, nz is a thicknesswise refractive index, and d is a layer thickness.