METHOD OF COMPENSATING WAVELENGTH DEPENDENCE OF BIREFRINGENCE OF OPTICAL PART, OPTICAL PART, AND DISPLAY OBTAINED WITH THESE

摘要

A method of compensating the wavelength dependence of birefringence of an optical part (B) which comprises using a film (a) made of a (co)polymer (E) obtained from at least one olefin selected among 4-methyl-1-pentene, 3-methyl-1-pentene, and 3-methyl-1-butene as a (co)monomer ingredient. Also provided is a layered product which comprises polarizing films, a retardation film (C) (nx>=ny>nz), retardation films (A) (nx>ny>=nz or nz>=nx>ny), and a liquid-crystal cell (L) arranged in the order of polarizing film-C-A-L-A-polarizing film or polarizing film-L-A-C-A-polarizing film. Due to the constitution, the layered product can have a high contrast and a wide viewing angle even when the retardation films are low in retardation.