Patent ID: 8878760

Claim:
A liquid crystal display device comprising: scanning signal lines provided in a display area; a scanning signal line driving circuit; and a dummy scanning signal line or a plurality of dummy scanning signal lines provided in a non-display area, the scanning signal lines being divided into groups each of which includes a plurality of scanning signal lines, the groups being sequentially selected, signal electric potentials of an identical polarity being sequentially supplied to a data signal line while scanning signal lines belonging to a selected one of the groups are sequentially scanned horizontally, the polarity of the signal electric potentials being inverted when the selected one of the group is changed from a preceding group to a succeeding group which is selected subsequent to the preceding group, a dummy scanning period or a plurality of dummy scanning periods being inserted between a horizontal scanning period corresponding to the last horizontal scanning in the preceding group and a horizontal scanning period corresponding to the first horizontal scanning in the succeeding group, the dummy scanning signal line or the plurality of dummy scanning signal lines being subjected to dummy scanning during the dummy scanning period or the plurality of dummy scanning periods, wherein a number of gate pulse(s), for dummy scanning, output from the scanning signal line driving circuit in the dummy scanning period or each of the plurality of dummy scanning periods is same as a number of gate pulse(s), for horizontal scanning, output from the scanning signal line driving circuit in the horizontal scanning period corresponding to the first horizontal scanning in the succeeding group, (i) a termination of a first gate pulse in the dummy scanning period or one of the plurality of dummy scanning periods and (ii) an initiation of a second gate pulse in the horizontal scanning period corresponding to the first horizontal scanning in the succeeding group have time overlap, and (A) each of the scanning signal lines is activated in synchronization with a start of corresponding horizontal scanning, and is deactivated in synchronization with an end of the corresponding horizontal scanning, a width of the first gate pulse and second gate pulse being equal to a single horizontal scanning period, or (B) each of the scanning signal lines is activated in synchronization with a start of another horizontal scanning carried out immediately before the corresponding horizontal scanning, and is deactivated in synchronization with the end of the corresponding horizontal scanning, a width of the first gate pulse and second gate pulse being two times as wide as a single horizontal scanning period.