A liquid crystal display device having a plurality of pixels arranged in a matrix, a plurality of video signal lines for supplying video signal voltages to the plurality of pixels, and a drive circuit which selects a voltage level of a gray scale voltage varying periodically as one of the video signal voltages corresponding to display data to be supplied to one of the plurality of pixels. The drive circuit has a plurality of series combinations of plural processing circuits, wherein each of the plurality of series combinations of plural processing circuits corresponds to one of the plurality of video signal lines, and each of the plural processing circuits comprises a parallel combination of a first switching element and a second switching element. The first and second switching elements are made operative or inoperative as a switch in accordance with different conditions.