A display device including a first pixel, a second pixel, and a control unit is provided. The first and second pixels are coupled to a data line. The control unit generates a first original image signal and a second original image signal required by the first and second pixels in a frame time according to an analog image and generates a first output image signal and a second output image signal according to the difference between the first and second original image signals. In the frame time, the control unit sequentially provides the first and second output image signals to the first and second pixels via the data line.