Abstract: A phase difference plate which comprises one sheet of polymer film containing a compound having a rod-shaped molecular structure and exhibiting a maximum absorption wavelength (&lgr;max) of less than 250 nm in an ultraviolet spectrum of its solution and which exhibits a retardation value as measured at a wavelength of 450 nm (Re450) of 60 to 135 nm and a retardation value as measured at a wave-length of 590 nm (Re590) of 100 to 170 nm, where the relationship: Re590-Re450≧2 nm is satisfied. The phase difference plate functions as a &lgr;/4 plate.

Abstract: A liquid crystal display device of the present invention, particularly for portable use, is a liquid crystal display device being lightweight, having flexibility, undergoing less breakage and exhibiting excellent color reproducibility and aging stability, and comprising a liquid crystal layer interposed between two substrates each having an electrode, wherein, of those two substrates, at least the substrate in the display face side is a plastic substrate having an optical anisotropy.