Stability of UV-Type Two-Domain Wide-Viewing-Angle Liquid Crystal Display

We calculated the Gibbs free energy for the splayed-twist state, the reversed-twist state, and the reversed-tilt state of UV-type two-domain wide-viewing-angle thin film transistor liquid crystal display (TFT-LCD) panels to evaluate the stability of the three configurations. We show that the smaller tilt angle is the dominant fact on that influences the stability of the splayed-twisted state. Further more, at high applied voltage, the reversed-tilt state is the most unstable, and is easily deformed into the reversed-twist state. Methods are therefore proposed for reducing the reversed-tilt state area. General trends of the critical voltage as a function of the chiral pitch, twist angle, cell gap, dielectric constant, and elastic constant are also discussed.