| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a transparent film for improving the warpage characteristics of a liquid crystal display, by having retardation that is negative in the film thickness direction, lessening the irregularities of the optical characteristics and variations due to environmental changes, such as the temperature and humidity, improving the viewing angle characteristics of the liquid crystal display, further lessening the absolute value of curl, and lessening the variations of curl due to environmental changes, such as the temperature and humidity. <P>SOLUTION: The transparent film has semi-IPN (semi-mutual penetration netting structure) polymer alloy of cellulose ester and crosslinking polymer, and a retardation value of the film thickness direction äwhere Rth<SB>(590)</SB>: Rth<SB>(λ)</SB>is the retardation value (units of nm) of the film thickness direction in wavelength λnm} is in the range of -400 to -25. <P>COPYRIGHT: (C)2007,JPO&INPIT |
