To obtain a phase difference plate which can control not only the phase difference in the front and oblique direction but its wavelength dispersion, and to develop a liquid crystal display device having superior display quality in which coloring in a white-and-black display is prevented over a wide viewing angle range.
Phase differences in the normal direction by lights of 400 nm and 550 nm wavelengths are denoted as R1 and R2, respectively, and the phase difference in the perpendicular direction is denoted as R3 when the plate is tilted at 40° from the normal line direction around the slow phase axis as the rotation axis. Ratios of R1/R2 and R3/R2 are denoted as α and β, respectively. The laminated phase difference plate consists of a laminate 1 of one of phase difference plates 11, 13 satisfying 1.05≤α<1.3 and β≤1 and one of phase difference plates 12, 14 satisfying 1<α<1.05 and β>1. The elliptically polarizing plate consists of a laminate 2 of the aforementioned laminated phase difference plate and a polarizing plate. The liquid crystal display device has a laminated phase difference plate or the laminated phase difference plate and a polarizing plate on at least one surface of a liquid crystal cell 3.
TSUCHIMOTO KAZUYOSHI
KONDO SEIJI
