Patent ID: 6829026
Filing Date: 2004-12-07
Classification: G02F

Abstract:
A laminated phase retarder, comprising:a first retardation layer made of a thermoplastic resin exhibiting positive birefringent characteristic; and a second retardation layer constituted by an oriented solidified layer of cholesteric liquid crystal exhibiting a selective reflection wavelength range not larger than 350 nm, and laminated on said first retardation layer; wherein Re of said laminated phase retarder is not smaller than 10 nm and Rthâˆ’Re of said laminated phase retarder is not smaller than 50 nm on the basis of light with a wavelength of 590 nm when Re and Rth are given by Re=(nxâˆ’ny)Ã—d and Rth=(nxâˆ’nz)Ã—d in which nx and ny are in-plane main refractive indices, nz is a thicknesswise refractive index, and d is a layer thickness, wherein: Re of said first retardation layer is in a range of from 20 to 300 nm and Rth/Rc of said first retardation layer is not smaller than 1.0, and Re of said second retardation layer is in a range of from 0 to 20 nm and Rth of said second retardation layer is in a range of from 30 to 500 nm.