Monomer and polymer, compensation film, optical film, and display device

A polymer being a product of reactants comprising a dianhydride and a monomer represented by Chemical Formula 1:

• wherein, in Chemical Formula 1,
• L1 and L2 are O,
• A1 and A2 are independently a benzene ring or a C3 to C30 hetero aromatic ring,
• p and q are independently an integer ranging from 1 to 20,
• o and r are independently an integer ranging from 0 to 3, and
• R1 and R2 are independently hydrogen, a substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C1 to C30 alkoxy group, a substituted or unsubstituted C3 to C30 cycloalkyl group, a substituted or unsubstituted C3 to C30 cycloalkoxy group, a substituted or unsubstituted C6 to C30 aryl group, a substituted or unsubstituted C2 to C30 heteroaryl group, a substituted or unsubstituted C7 to C30 arylalkyl group, a hydroxy group, a halogen, a nitro group, —NR′R″, —CO—NR′R″, —SiR′R″R′″ (wherein R′, R″, and R′″ are independently hydrogen, a C1 to C30 alkyl group, a C6 to C30 aryl group, or a C7 to C30 arylalkyl group), or a group represented by Chemical Formula 2:
• wherein, in Chemical Formula 2,
• L3 and L4 are independently O, CO, COO, C≡C, or CONRb (wherein, Rb is hydrogen or a C1 to C30 alkyl group),
• A3 and A4 are independently a substituted or unsubstituted C6 to C30 aromatic ring, a substituted or unsubstituted fluorene ring, a substituted or unsubstituted C7 to C30 arylalkyl group, or a substituted or unsubstituted C3 to C30 hetero aromatic ring group, and
• s and t are independently an integer ranging from 0 to 3.