LIQUID CRYSTAL DISPLAY/OPTICAL RETARDATION COMPENSATOR COMBINATION IN WHICH VARIATIONS IN THE DISPERSION OF LIGHT IN THE LIQUID CRYSTAL AND/OR IN THE COMPENSATOR MATERIALS MINIMIZE UNDESIRED SCREEN COLORATION

摘要

The liquid crystal display device is composed of at least one optical retardation compensator plate 2 (and 3) inserted between a liquid crystal display element 1 and polarizer plates 4 and 5. The liquid crystal display element 1 is composed of a pair of electrode substrates 6 and 7 and a liquid crystal layer 8 sealed therebetween. The polarizer plates 4 and 5 flank the liquid crystal display element 1. The optical retardation compensator plate 2 (and 3) has a negative refractive index anisotropy (na=ncnb). The direction of a principal refractive index nb parallel to the normal to the surface and the direction of either a principal refractive index na or nc in the surface incline either clockwise or counterclockwise around the direction of the principal refractive index nc or na in the surface. Moreover, either the pretilt angle formed by the orientation films 11 and 14 and the longer axes of liquid crystal molecules in the liquid crystal layer or the value of applied voltage for displaying halftone obtained by applying to the liquid crystal a voltage that is close to the threshold voltage for the liquid crystal is set within such a range that tone reversion does not occur in the opposite viewing direction when halftone is being displayed.