Abstract: The disclosed invention reduces the power consumption of a liquid-crystal device. A shift register section includes DX selection circuits and shift registers, which are divided into blocks. An X clock signal is supplied to a block in which the image data values do not match between horizontal lines which are adjacent in a data time-series manner, and is not supplied to a block in which the image data values match. In addition, for the block in which the image data values match, the image data, which forms time-division data becomes non-active, and the previous data value is maintained. For this reason, it is possible to reduce electric power for driving an X clock signal supply line and an image data supply line.

Abstract: Sustaining discharges are conducted in a first sub-field in a pair of adjacent first and second sub-fields. Then, writing discharges in a second sub-field are conducted after the sustaining discharges in the first sub-field without conducting any erasure discharge between the sustaining discharges and the writing discharges. A relation expressed by an equation L1=L2=1 and an inequality Ln+2≦Ln+1+Ln holds for a luminance weighting Li. The luminance weighting Li is a luminance weighting of the i-th lowest sub-field from the bottom among the plurality of sub-fields.