Display device and driving method thereof

The invention discloses a display device and a driving method thereof. The display device comprises a plurality of sub-pixels, a plurality of sensing units and a positioning module, the sensing unit is arranged corresponding to one or more sub-pixels, the sensing unit comprises a photosensitive element, an input end and an output end, the input end receives a first electric signal, and the output end outputs a second electric signal according to the light intensity of light sensed by the photosensitive element; the positioning module is used for obtaining position information of the corresponding sensing unit when the second electric signal is larger than a preset threshold value. The sensing units and the sub-pixels are correspondingly arranged, the input ends receive the first electric signals, the photosensitive elements can sense the light intensity of the light rays irradiated on the photosensitive elements, and the second electric signals are output according to the light intensity. The positioning modu