Patent ID: 7202880

Claim:
An image display device comprising: an image display part for displaying an image; and a plurality of dummy pixels which are arranged in a periphery of the image display part, wherein the plurality of dummy pixels are pixels to which a voltage is applied based on pixel electrodes and common electrodes corresponding to the dummy pixels, a first potential difference between a voltage of pixel electrodes of the dummy pixels to which a given gray scale voltage of positive polarity is written among the plurality of dummy pixels and a common voltage applied to the common electrodes corresponding to the dummy pixels is detected, a second potential difference between a voltage of pixel electrodes of the dummy pixels to which a given gray scale voltage of negative polarity is written among the plurality of dummy pixels and the common voltage applied to the common electrodes corresponding to the dummy pixels is detected, and the voltage applied to the common electrodes is controlled so as to make the first potential difference and the second potential difference equal to each other.