摘要:
PROBLEM TO BE SOLVED: To provide a highly reliable biaxial retardation film without the problems of peeling off of the retardation layer from the base material or the like generated in forming the retardation layer, capable of enlarging the range of the thickness direction and in-plane direction retardation values to be obtained, easily obtaining optional thickness direction and in-plane direction retardation values even for a small amount, a method for producing the same, an optical functional film using the retardation layer, a polarizing film and a display device. SOLUTION: The optically biaxial retardation film comprises a polymer film containing a material having refractive index anisotropy, wherein the material having refractive index anisotropy has a concentration gradient in a thickness direction of the polymer film. COPYRIGHT: (C)2009,JPO&INPIT
摘要:
PROBLEM TO BE SOLVED: To provide a novel optical anisotropic film which can contribute to improvement of a viewing angle characteristic of a reflection transmission type liquid crystal display device and which can be easily manufactured. SOLUTION: The optical anisotropic film comprises at least one liquid crystalline compound which develops a nematic phase or a smectic phase and has a birefringence index ▵n(λ) of the liquid crystal phase satisfying the formula (1): ▵n(450 nm)/▵n(550 nm) COPYRIGHT: (C)2009,JPO&INPIT
摘要:
PROBLEM TO BE SOLVED: To provide an inexpensive optical film excellent in optical homogeneity. SOLUTION: The optical film includes at least one layer based on a crystalline propylene-1-butene random copolymer comprising 70-97.5 mol% of a monomeric unit derived from propylene and 2.5-30 mol% of a monomeric unit derived from 1-butene, wherein the sum total of the monomeric unit derived from propylene and the monomeric unit derived from 1-butene in the crystalline propylene-1-butene random copolymer is 100%. The optical film is formed through stretching in at least one direction. The optical film is a retardation film. COPYRIGHT: (C)2009,JPO&INPIT