Display device and driving method thereof

The invention provides a display device and a driving method thereof. The display device includes: a substrate; the pixel electrode, the common electrode and the driving chip are arranged on the substrate; the common electrode comprises a plurality of first electrode parts and a plurality of second electrode parts; the display device comprises a plurality of first sub-pixels and a plurality of second sub-pixels, the plurality of first electrode parts are in one-to-one correspondence with the plurality of first sub-pixels, and the plurality of second electrode parts are in one-to-one correspondence with the plurality of second sub-pixels; in the first display stage, the driving chip is used for sending a preset voltage signal to the first electrode part, so that the first sub-pixel performs display, and the second electrode part can be controlled to be multiplexed as a touch electrode; and in the second display stage, the driving chip is used for sending a preset voltage signal to the second electrode part, so