Patent ID: 7817128
Filing Date: 2010-10-19
Classification: G09G

Abstract:
1. A liquid crystal display device comprising: a liquid crystal panel with a memory effect including: a liquid crystal having a memory effect being a ferroelectric liquid crystal having at least two stable states; a pair of substrates sandwiching said liquid crystal having a memory effect, said pair of substrates having scanning electrodes and signal electrodes on opposed surfaces respectively, portions thereof where said scanning electrodes are opposed to said signal electrodes with said liquid crystal having a memory effect intervening therebetween forming pixels; and a driving circuit for driving said liquid crystal panel with a memory effect to cause said pixels to display image data, wherein said driving circuit applies, to said scanning electrode of said liquid crystal panel with a memory effect, a scanning voltage of a voltage waveform composed of a voltage zero and only one of positive or negative unipolar voltage consistently across a plurality of scanning periods, and also, to said signal electrode, a signal voltage of a voltage waveform composed of a voltage zero and a unipolar voltage having the same polarity as the polarity of the scanning voltage consistently across the plurality of scanning periods, wherein the image data displayed at said pixel is displayed during the plurality of scanning periods, the voltage applied between said scanning electrode and said signal electrode forming said pixel during the plurality of scanning periods is alternating voltage, wherein a waveform of the voltage applied between said scanning electrode and said signal electrode during a first scanning period and a subsequent scanning period is asymmetrical, wherein an absolute value of the voltage applied between said scanning electrode and said signal electrode during the subsequent scanning period is smaller than an absolute value of a threshold voltage of said ferroelectric liquid crystal, and wherein a white or black image displayed by any of said pixels is kept in a same state during said plurality of scanning periods.