OPTICAL FILM, POLARIZING PLATE AND LIQUID CRYSTAL DISPLAY

摘要

[Problems] To provide an optical film for a liquid crystal display that has good viewing angle compensation effects such as preventing color dropout (coloration) and achieving high contrast in all directions when used in a liquid crystal display. [Means for solving problems] An optical film of the invention comprises at least one film (a) layer made of a cyclic olefin resin exhibiting positive birefringence and a film (b) layer made of a polymer exhibiting negative birefringence laminated on said film (a) layer, and satisfies (1) 0.1 ‰ Nz-coefficient ‰ 0.9, (2) 0.5 ‰ R450/R550 ‰ 0.9, (3) 1.0 ‰ R650/R550 ‰ 1.3 and (4) 200 nm ‰ R550 ‰ 350 nm; wherein R450, R550 and R650 represent the retardation R at wavelengths of 450 nm, 550 nm and 650 nm, respectively.