| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical film having high contrast and improving viewing angle-dependent color shift in black display, and to provide an optical compensation film, a polarizing plate and a liquid crystal display using the optical film. <P>SOLUTION: The optical film includes a transparent polymer film and has a value A1 defined by formula (1) ranging from 0.10 to 0.95, a value A2 defined by formula (2) ranging from 1.01 to 1.50, and a glass transition temperature of 120°C or higher. The formulae are (1):A1=Re(450)/Re(550) and (2):A2=Re(650)/Re(550), wherein Re(450) indicates an in-plane retardation value of the optical film to light having a wavelength of 450 nm, Re(550) indicates an in-plane retardation value of the optical film to light having a wavelength of 550 nm, and Re(650) indicates an in-plane retardation value of the optical film to light at a wavelength of 650 nm. The optical compensation film, the polarizing plate and the liquid crystal display use the above optical film. <P>COPYRIGHT: (C)2007,JPO&INPIT |
