The invention relates to a flat panel display device and driving method thereof, which can reduce the cost of the drive circuit by reducing the number of the data line. The panel display device comprises: a plurality of gating and a plurality of data lines on the substrate; an image display unit including a plurality of pixel units, wherein two adjacent pixel units along the gating line directionare drived by one data line; timing controller for aligning the source data provided from the outside and generating a control signal and a clock signal; a plurality of data driving integrate circuitfor converting the source data to a analog video signal based on the control signal, providing the analog video signal to a plurality of data lines and promoting and outputting the clock signal; and gating drive circuit for generating a scan signal which is overlapped by the respective unit and correlating to half of one level cycle based on the promoted clock signal and providing the overlapped scan signal to a plurality of gating lines in order.