Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers

Stability of UV-type two-domain wide-viewing-angle liquid crystal display

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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.