| 摘要 |
An optical film is provided to ensure excellent heat resistance, durability, workability and optical clarity, and good mechanical strength and to control in-plane phase difference and phase difference in a thickness direction. An optical film comprises an aromatic based resin comprising a chain having the hydroxy group containing portion and aromatic moiety. According to the following equation: Rin=(nx-ny)xd, Rth=[(nx+ny)/2-nz]xd, the in-plane retardation Rin is in the range of 0 to 600 nm and the thickness retardation Rth is in the range of 0 to 400 nm, wherein nx is the largest refractive index among in-plane refractive indexes of the optical film, ny is the refractive index in a direction that is vertical to nx of the in-plane refractive index of the optical film, nz is the thickness refractive index of the optical film, and d is the thickness of the film. |
