FIELD: information technology.
SUBSTANCE: groups, each of which includes scanning signal lines, are sequentially selected; a polarity of data signal electric potentials in one (first group) of sequentially-selected groups is set to be different from that of the other (second group) of the two groups. Two pieces of dummy scan periods (HX and HY) are put between (i) a horizontal scan period (H 12) corresponding to a last horizontal scan in the first group and (ii) a horizontal scan period (H 13) corresponding to a first horizontal scan in the second group. Dummy signal electric potentials are supplied to the data signal line in the dummy scan periods; and a time period (T) from when a scanning pulse (GP12) which corresponds to the last horizontal scan in the first group becomes non-active to when the dummy scan period (HX) is started is set to be longer than a time period (t) from when a scanning pulse (GP11) corresponding to one (H11) of consecutive two horizontal scans becomes non-active in the first group to when a horizontal scan period (H 12) corresponding to the other of the consecutive two horizontal scans is started.
EFFECT: enhancing quality of display in a case where the data signal line is subjected to block-reversal driving.
26 cl, 20 dwg
