Patent ID: 8293146

Claim:
An optical film, which has been subjected to an orientation treatment, comprising at least one low-molecular weight compound, wherein a birefringence Δn(550 nm) is larger than zero (0) in an orientation direction, wherein the optical film satisfies the following expressions (1) and (2): 0.5 <Δn (450 nm)/Δ n (550 nm)<1.0; and Expression (1) 1.05 <Δn (630 nm)/Δ n (550 nm)<1.5, and Expression (2) wherein the low-molecular weight compound is a compound represented by formula (I): wherein L 1 and L 2 each independently represents a group selected from the group consisting of A 1 and A 2 each independently represent a group selected from the group consisting of —O—, —NR— (in which R represents a hydrogen atom or a substituent), —S—, and —CO—; R 1 represents a substituent; R 2 and R 3 each independently represent a benzene ring having a substituted or unsubstituted benzoyloxy group at the 4-position, a benzene ring having a substituted or unsubstituted cyclohexyl group at the 4-position, a cyclohexane ring having a substituted or unsubstituted benzene ring at the 4-position, or a cyclohexane ring having a substituted or unsubstituted cyclohexyl group at the 4-position; X represents a nonmetallic atom belonging to any of Groups 14 to 16, and may have a hydrogen atom or a substituent; and n represents an integer of 0 to 2.