Optical film, preparation method of the same, and liquid crystal display comprising the same

(canceled)

A preparation method of optical film, comprising the steps of:

• 1) applying and drying the composition for liquid crystal alignment layer comprising a) one or more photoreactive polymer selected from the group consisting of a norbornene-based photoreactive polymer comprising a cinnamate group, a photoreactive polymer comprising an unit represented by the Formula 1, and a photoreactive polymer comprising an unit represented by the Formula 2, b) a multifunctional monomer crosslinkable with the photoreactive polymer, c) a photoinitiator, and d) an organic solvent on the substrate of cycloolefin-based film to form a coating, and then irradiating UV rays to form a liquid crystal alignment layer, and
• 2) applying and drying a liquid crystal compound solution comprising a polymeric liquid crystal compound, a photoinitiator, and an organic solvent on the liquid crystal alignment layer, and then irradiating UV rays thereto:

(canceled)

(canceled)