| 简介 |
PROBLEM TO BE SOLVED : To provide a polymer film which has excellent visual field angle characteristics and is not likely to affect display color tone when used for a liquid crystal display as a protective layer of a polarizing plate because of its small optical anisotropy and small wavelength dispersion in optical anisotropy, and furthermore, which has a controlled laminability so that it can be suitably used in an image display device of the liquid crystal display, etc.
SOLUTION : The polymer film has a front retardation value Re (λ) and a retardation value Rth(λ) in the film thickness direction which satisfy the following formula (i) and (ii) respectively. At least one surface thereof has a surface energy of 50 mN/m to 80 mN/m. Optical materials such as the optical compensation film and the polarizing plate, and the liquid crystal display are produced using the polymer film. The formula (i) is 0≤Re(630)≤10 and |Rth(630)|≤25, and the formula (ii) is |Re(400)-Re(700)|≤10 and |Rth(400)-Rth(700)|≤35, wherein Re(λ) and Rth(λ) are measured values at the wavelength λnm (unit : nm).
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