Patent ID: 8284144

Claim:
A method for driving a liquid crystal display device including pixel electrodes, counter electrodes and liquid crystal provided between the pixel electrode and the counter electrodes, to suppress an uneven distribution of ions in the liquid crystal, the method comprising the steps of: applying a common voltage to the counter electrodes; applying a first image signal to the pixel electrodes; applying a second image signal to the pixel electrodes, applying a first clock for starting a frame period; applying a second clock for changing a polarity of the first and second image signals, applying another second clock for again changing a polarity of the first and second image signals, and applying another first clock after said another second clock has been applied, wherein: the first image signal has a positive polarity with reference to the common voltage, the second image signal has a negative polarity with reference to the common voltage, the first image signal and the second image signal are applied to respective pixels at the same position, the common voltage drifts from an intermediate value of the first image signal and the second image signal, the first image signal is applied to the liquid crystal during a first applying period started by the second clock, the second image signal is applied to the liquid crystal during a second applying period started by the another second clock, the frame period is repeated periodically, a time spacing between said second clock and said another second clock is shorter than a time spacing between said first clock and said another first clock, the second applying period is longer than the first applying period to thereby suppress the uneven distribution of ions in the liquid crystal, and the another first clock and the another second clock are output asynchronously.