REFLECTION LIQUID CRYSTAL DISPLAY DEVICE

摘要

A reflection liquid crystal display device comprising only one polarization film, wherein the twist angle of a nematic liquid crystal ranges from 0 DEG to 90 DEG , the relationship between the difference between the indexes of birefringence DELTA nLC, the thickness of the liquid crystal layer dLC, and the retardation of the phase plate RF is expressed by DELTA nLC.dLC=0.20 to 0.30 mu m, RF- DELTA nLC.dLC=-0.20 to -0.05 mu m. Defining the direction in which a nematic liquid crystal is twisted toward a lower substrate when viewed from above an upper substrate is positive, and letting the direction of the major axis of the liquid crystal molecule the nearest to one of upper and lower substrates be represented PHI LC, the direction of the phase lagging axis of the phase plate be represented PHI F, and the direction of the absorbing or transmitting axis of the polarization film be represented PHI P, the relationship between the directions is expressed by PHI F- PHI LC=-40 DEG to -25 DEG , PHI P- PHI F=+50 DEG to +80 DEG or PHI F- PHI LC=+65 DEG to +105 DEG , PHI P- PHI F=-60 DEG to -90 DEG . Therefore, bright white can be displayed and a nonchromatic high-contrast image can be also displayed.