| abstract |
An optical film, which has been subjected to an orientation treatment, containing a low-molecular weight compound, in which a birefringence Δn(550 nm) is larger than zero (0) in an orientation direction, and the optical film satisfies the following expressions (1) and (2); and a phase difference plate, a polarizing plate and a liquid crystal display using the same: n 0.5<Δ n (450 nm)/Δ n (550 nm)<1.0; and Expression (1) n 1.05<Δ n (630 nm)/Δ n (550 nm)<1.5. Expression (2) |