| 摘要 |
PROBLEM TO BE SOLVED: To obtain a liquid crystal display device, for which the division of quarter-wave length plate region is unnecessary, provided with a thin cholesteric liquid crystal layer and a quarter-wave length plate. SOLUTION: In the liquid crystal display device equipped with a liquid crystal cell, a linearly polarizing film, the cholesteric liquid crystal layer divided into plural regions with different helical pitches of the cholesteric liquid crystal and the quarter-wave length plate, a broad band quarter-wave length plate comprising optically an isotropic layers A, B is used as the quarter-wave length plate. One out of the optically an isotropic layers A, B is a layer formed with liquid crystalline molecules and the other is layer formed with the liquid crystalline molecules or a polymer film. Besides, all of the respective (retardation value)/(wavelength value) ratios of the quarter-wavelength plate measured at wavelengths of 480 nm, 550 nm 630 nm fall in 0.2-0.3 range. |
