Patent ID: 9583053
Date: 2017-02-28
CPC Classifications: G09G

Claim:
1. A liquid crystal display device in which pixels having a memory function are arranged, comprising: pixel electrodes constituting the pixels arranged in a matrix; counter electrodes disposed opposed to the pixel electrodes, liquid crystal capacitors of the pixel being formed between the pixel electrodes and the counter electrodes; a display drive unit configured to perform display driving by a driving method for obtaining halftone gray scales by setting frames as one cycle and temporarily changing gray scales of respective pixels within one cycle; and a pixel drive circuit configured to supply a first signal and a second signal that is different from the first signal to each of the pixel electrodes, the first signal being switched to the second signal or the second signal being switched to the first signal by each of the frames, at a switching timing, wherein the counter electrodes are applied with a common voltage signal of which a polarity is inverted in a polarity cycle of a polarity cycle period; wherein the first signal has, in all of the polarity cycle periods, a same phase with the common voltage signal; wherein the second signal has, in a first-second voltage period of the polarity cycle period, one of a first voltage and a second voltage, each of which is a voltage of a reverse phase to the common voltage signal, and in a third voltage period of the polarity cycle period, a third voltage that is between the first voltage and the second voltage, the first-second voltage period and the third voltage period are alternately repeated; and wherein the switching timing is when the second signal is switched from the first voltage or the second voltage to the third voltage.