At least one embodiment of a liquid crystal display device including a display unit having scan signal lines divided into a plurality of groups which are successively selected. While the scan signal lines belonging to the selected group are successively scanned horizontally, signal potentials of the same polarity are successively supplied to a data signal line. The polarity of the signal potential is reversed between a preceding group and a subsequent group which are selected continuously. A plurality of dummy scan periods are inserted between the horizontal scan period corresponding to the last horizontal scan in the preceding group and the horizontal scan period corresponding to the first horizontal scan in the subsequent group. In each of the dummy scan periods, one of the scan signal lines which belong to the group selected after the preceding group is subjected to a dummy scan so that the scan signal line is maintained in an active state for a predetermined period and then deactivated so as to align the load state of a scan signal line drive circuit. This can reduce irregularities of the horizontal stripes when the data signal line is subjected to the block reverse drive.