A driving device is configured for driving a display panel and includes a data driver, a plurality of switches, and an image determiner. The switch is electrically coupled between data lines of a first data line group. The data driver is configured to output data signals to the data lines of the first data line group. The data signals transferred by the data lines of the first data line group include a plurality of pulse transitions while the display panel displays an image. The image determiner is configured to determine the image displayed by the display panel and output a driving signal based on a determined result for activating a corresponding switch such that the data lines of the first data line group can perform charge sharing therebetween. Furthermore, a method for driving a display panel is disclosed herein.