PHASE DIFFERENCE FILM, CIRCULARLY POLARIZING PLATE USING SAME, AND IMAGE DISPLAY DEVICE

摘要

An object of the present invention is to provide a retardation film succeeded in solving those conventional problems, that is, a retardation film insusceptible to color dropout or color shift even under environment of severe temperature or humidity conditions and capable of being produced by a melt film-forming method. The retardation film of the present invention satisfies the relationships of the following formulae (A) and (B): 0.7 < R 1 450 / R 1 550 < 1 R 2 450 / R 2 550 - R 1 450 / R 1 550 < 0.020