A cellulose acylate film that has: an in-plane retardation Re and a retardation Rth in a thickness direction at a wavelength of 590 nm, which are satisfied with ranges of expressions (I) to (III); a coefficient of a thermal expansion of from 20 ppm/° C. to 100 ppm/° C.; and a haze of from 0.01 to 0.8, and a polarizing plate and a display device using the same.
20≦Re≦50 Expression (I)
70≦Rth≦200 Expression (II)
1.0≦Rth/Re≦3.0 Expression (III)
In the foregoing expressions, each of Re and Rth is a value at 25° C. and 60% RH, and has a unit of nm.
一种
丙烯酸纤维素薄膜,其在波长为 590 纳米时的面内阻滞率 Re 和厚度方向上的阻滞率 Rth 符合表达式 (I) 至 (III) 的范围;热膨胀系数为 20 ppm/°C 至 100 ppm/°C;雾度为 0.01 至 0.8,以及使用该薄膜的偏光板和显示装置。
20≦Re≦50 Expression (I)
70≦Rth≦200 Expression (II)
1.0≦Rth/Re≦3.0 表达式 (III)
在上述表达式中,Re 和 Rth 均为 25° C 和 60% 相对湿度下的数值,单位为纳米。