| 简介 |
Provided is a liquid crystal display device having excellent viewing angle characteristics and a high contrast ratio even in an oblique direction. This optical compensation film is configured from a film A that satisfies formulas (1) through (3) laminated on a film B that satisfies formulas (4) and (5). The film B is a copolymer composed of an aromatic vinyl monomer unit, an unsaturated dicarboxylic acid anhydride monomer unit, and a (meth)acrylic acid ester monomer unit. An in-plane phase difference Re is a value defined by a formula (6) and a thickness-direction phase difference Rth is a value defined by a formula (7), the Re(450), Re(550), and Re(650) representing in-plane phase differences for wavelengths 450 nm, 550 nm and 650 nm, Rth(550) representing a thickness-direction phase difference for a wavelength 550 nm, nx representing a refractive index along the slow axis direction of the film, ny representing a refractive index along the fast axis direction of the film, nz representing a refractive index along the thickness direction of the film, and d representing the thickness of the film. Re(450) < Re(550) < Re(650) (1) 25 nm ≤ Re(550) ≤ 280 nm (2) 12 nm ≤ Rth(550) ≤ 95 nm (3) 0 nm ≤ Re(550) ≤ 140 nm (4) −140 nm ≤ Rth(550) ≤ 0 nm (5) Re = (nx − ny) × d (6) Rth = {(nx + ny) ÷ 2 − nz} × d (7) |
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