Patent ID: 7375712

Claim:
A liquid crystal display comprising: a liquid crystal capacitance formed by sandwiching a liquid crystal between electrodes facing each other; a positive polarity driving circuit system for charging the liquid crystal capacitance with a positive charge by applying a voltage having a positive polarity between the electrodes; and a negative polarity driving circuit system provided separately from the positive polarity driving circuit system for charging the liquid crystal capacitance with a negative charge by applying a voltage having a negative polarity between the electrodes; wherein the electrodes facing each other have: a pixel electrode provided at each of a plurality of pixels having the liquid crystal capacitance; and a common electrode facing each of the pixel electrodes with the liquid crystal interposed therebetween to apply a common voltage thereto; wherein the pixels have: a positive-voltage-applying TFT for applying a voltage having the positive polarity to the pixel electrode; and a negative-voltage-applying TFT for applying a voltage having the negative polarity to the pixel electrode; wherein a conductivity type of channels of the positive-voltage-applying TFT and the negative-voltage-applying TFT is the same; wherein an operating range for a gate voltage of the positive-voltage-applying TFT is different from an operating range for a gate voltage of the negative-voltage-applying TFT; wherein a potential to keep the positive-voltage-applying TFT off is different from a potential to keep the negative-voltage-applying TFT off; and a potential difference between a potential to keep the positive-voltage-applying TFT on and the potential to keep the positive-voltage-applying TFT off is different from a potential difference between a potential to keep the negative-voltage-applying TFT on and the potential to keep the negative-voltage-applying TFT off.