The reflective color LCD without a backlight is an important key device for the progress and diffusion of high functional portable information terminal. We have previously proposed a single polarizer reflective TN-LCD of normally white mode composed of a driving TN cell and a compensating liquid-crystal polymer film with a twist angle of the same magnitude, but opposite-handed of the LC layer. The twist angle dependence of the electro-optical properties of the LCD has been numerically analyzed, and it was found that the optimal twist angle of TN cell is about 60° because the optimal cell has high contrast ratio and retardation of the LC layer of practical use.
