Patents Examined by Kari M. Hoirey
  • Patent number: 5995181
    Abstract: An antiferroelectric liquid crystal display apparatus with a high display quality is provided wherein the display screen in the absence of an applied voltage is free from unevenness when power is turned off. An intrinsic antiferroelectric axis direction is set at the midpoint between the average molecular axis direction when the liquid crystal panel is in a rightward-tilted antiferroelectric state and that when it is in a leftward-tilted antiferroelectric state, and the polarization axis of a polarizer is oriented in the same direction as the intrinsic antiferroeelctric axis direction. The rightward-tilted antiferroelectric state refers to a displacement from the average molecular axis direction in the antiferroelectric state, after returning from the rightward-tilted ferroelectric state, while the leftward-tilted antiferroelectric state refers to a displacement from the average molecular axis direction in the antiferroelectric state, after returning from the leftward-tilted ferroelectric state.
    Type: Grant
    Filed: November 25, 1998
    Date of Patent: November 30, 1999
    Assignee: Citizen Watch Co., Ltd.
    Inventor: Satoshi Imoto