摘要 |
An optical compensation film comprising a cellulose ester film is disclosed. In the film, (a) each of photoelastic coefficient C(md) in a mechanical direction and photoelastic coefficient C(td) in the transverse direction of the cellulose ester film is 1x10<SUP>-9 </SUP>to 1x10<SUP>-13 </SUP>Pa<SUP>-1 </SUP>and C(md)<C(td), (b) retardation R<SUB>0 </SUB>within the plane of the cellulose film defined by Formula (I) is 20 to 70 nm, (c) retardation R<SUB>t </SUB>of the cellulose ester film in a thickness direction, defined by Formula (II) is 70 to 400 nm, and (d) both of a dimensional variation ratio S(md) in the mechanical direction and a dimensional variation ratio S(td) in the transverse direction of the cellulose ester film prior to and after being allowed to stand at ambient conditions of 80° C. and 90 percent relative humidity for 50 hours are -1 to 1 percent, |S(md)|>|S(td)|, and C(td)x|S(td)|<C(md)x|S(md)|.
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