A method for driving a liquid crystal display device, the method comprising the steps of: sequentially selecting, by a gate driver of said liquid crystal display, groups (Grl,Gr2) each of which includes scanning signal lines (G1-G12, G13-G24) of said liquid crystal display; sequentially supplying, by a source driver of said liquid crystal display, data signal electric potentials corresponding to pieces of image data (D11, D12) and having an identical polarity to a data signal line of a plurality of data signal lines of said liquid crystal display during respective horizontal scan periods (H11, H12), in response to sequentially supplying scanning pulses (GP11, GP12) to respective scanning signal lines (G11, G12) which belong to a selected group, correspondingly to the respective horizontal scan periods (H11, H12); putting, by the gate driver of said liquid crystal display, a dummy scan period between a last horizontal scan period for a first group and a first horizontal scan period for a second group selected subsequently to the first group; and supplying, by the source driver of said liquid crystal display, a dummy signal electric potential corresponding to dummy data to the data signal line during the dummy scan period, wherein the dummy scan period is a time period during which the dummy signal electric potential is being supplied to the data signal line, wherein the polarity of the data signal electric potentials for the first group is different from that of the second group and the polarity of the dummy signal electric potential; and characterized in that a time period from a time point when a scanning pulse corresponding to the last horizontal scan period for the first group becomes non-active to a time point when the dummy scan period is started is longer than a time period (t) from a time point when a scanning pulse corresponding to a former one of two consecutive horizontal scan periods (H11, H12) for the first group becomes non-active to a time point when a subsequent one of the two consecutive horizontal scan periods (H11, H12) is started. sequentially selecting, by a gate driver of said liquid crystal display, groups (Grl,Gr2) each of which includes scanning signal lines (G1-G12, G13-G24) of said liquid crystal display; sequentially supplying, by a source driver of said liquid crystal display, data signal electric potentials corresponding to pieces of image data (D11, D12) and having an identical polarity to a data signal line of a plurality of data signal lines of said liquid crystal display during respective horizontal scan periods (H11, H12), in response to sequentially supplying scanning pulses (GP11, GP12) to respective scanning signal lines (G11, G12) which belong to a selected group, correspondingly to the respective horizontal scan periods (H11, H12); putting, by the gate driver of said liquid crystal display, a dummy scan period between a last horizontal scan period for a first group and a first horizontal scan period for a second group selected subsequently to the first group; and supplying, by the source driver of said liquid crystal display, a dummy signal electric potential corresponding to dummy data to the data signal line during the dummy scan period, wherein the dummy scan period is a time period during which the dummy signal electric potential is being supplied to the data signal line, wherein the polarity of the data signal electric potentials for the first group is different from that of the second group and the polarity of the dummy signal electric potential; and characterized in that a time period from a time point when a scanning pulse corresponding to the last horizontal scan period for the first group becomes non-active to a time point when the dummy scan period is started is longer than a time period (t) from a time point when a scanning pulse corresponding to a former one of two consecutive horizontal scan periods (H11, H12) for the first group becomes non-active to a time point when a subsequent one of the two consecutive horizontal scan periods (H11, H12) is started.