The invention enables a liquid crystal display device which has two liquid crystal panels to make different displays thereupon respectively by using a source driver in common. The disclosed liquid crystal display device is equipped with a timing controller 1 which controls output timing of video data signals to the liquid crystal panels 3 and 8 sharing drain lines, the source driver 2 which outputs video data by a plurality of drain lines 4 of the liquid crystal panels under the output timing control, and gate drivers 7 and 9 which output gate drive pulses to gate lines 5 and 6 of the liquid crystal panels in order according to a signal indicating the start of output of video data signals to the liquid crystal panel and a signal controlling input cycles of the video data by the lines constituting the video data signals, and outputs the video data by the plurality of lines of the plurality of video data signals to the drain lines of the corresponding liquid crystal panels in the input order sequentially by the video data lines.