Patent ID: 7081876

Claim:
A method for driving a liquid crystal display device which includes (i) a plurality of signal electrodes, (ii) a plurality of scanning electrodes which cross said plurality of signal electrodes, (iii) an active element provided in a vicinity of each intersection at which one of said plurality of scanning electrodes cross and connected to said one of said plurality of signal electrodes and said one of said plurality of scanning electrodes, (iv) a pixel electrode driven by said active element, and (v) a counter electrode to which an AC signal is applied, and which faces said pixel electrode, said method comprising the step of generating a counter electrode driving signal, which drives said counter electrode, in such a manner that, when a root-mean-square value of voltage in a period of one polarity is different from a root-mean-square value of voltage in a period of the other polarity, the root-mean-square value of voltage in the period of one polarity becomes equal to the root-mean-square value of voltage in the period of the other polarity during one vertical period, wherein said counter electrode driving signal is generated in such a manner that the polarity is inverted every predetermined period, and, when the number of periods of one polarity is different from the number of periods of the other polarity during one vertical period, the number of periods of one polarity becomes equal to the number of periods of the other polarity.