| 摘要 |
A phase difference plate which is constituted of one sheet of a polymer film having a retardation value measured at a wave length of 450 nm (Re(450)) of 100 to 125 nm and a retardation value measured at a wave length of 590 nm (Re(590)) of 120 to 160 nm, wherein the relationship of Re(590) - Re(450) = 2 nm is satisfied, and has DR0 and DR20 satisfying the relationship of |DR20(<) DR0(?) | = 0.02 at wave lengths of 450 nm and 750 nm. One sheet of a polymer film is used as a phase difference plate. |
