Optical film and optical compensatory film, polarizing plate and liquid crystal display using same

摘要

An optical film is provided and contains at least one of a polycarbonate copolymer and a blend containing the polycarbonate copolymer. The polycarbonate copolymer contains specific repeating units. The optical film satisfies the following formulae (1) to (4). <?in-line-formulae description="In-line Formulae" end="lead"?>0.1<Re(450)/Re(550)<0.95 (1)<?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>1.03<Re(650)/Re(550)<1.93 (2)<?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>0.4<(Re(450)/Rth(450))/(Re(550)/Rth(550))<0.95 (3)<?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>1.05<(Re(650)/Rth(650))/(Re(550)/Rth(550))<1.90 (4)<?in-line-formulae description="In-line Formulae" end="tail"?>