Patent ID: 7502006

Claim:
A method to adjust an electro-optical apparatus, the electro-optical apparatus including a plurality of pixel electrodes electrically connected to a switching element disposed at each intersection of a plurality of scanning lines and a plurality of data lines, an opposing electrode opposed to the plurality of pixel electrodes with an electro-optical material sandwiched there between, a scanning-line drive circuit which selects each of the plurality of scanning lines in sequence and turns on the switching element corresponding to the scanning line, and a data-line drive circuit which supplies an image signal, whose polarity is periodically inverted with respect to a predetermined potential as a standard, to the pixel electrode through the data line and the switching element, the method comprising: first adjusting, while displaying a certain image, a common potential applied to the opposing electrode to a potential at which a variation amount of light emitted from the electro-optical apparatus is minimized; and second setting the common potential to a potential higher than the potential adjusted in the first adjusting so as to suppress a difference between an effective voltage value corresponding to when the image signal is of positive polarity and an effective voltage value corresponding to when the image signal is of negative polarity, the difference being attributable to effects of variation of a potential at the pixel electrode through the switching element during a transition from an active level to a non-active level of the scanning line.