A display system includes a display device, a driving circuit, a flexible printed circuit (FPC), and a charge pump circuit. The driving circuit is disposed on the display device for driving the display device. The FPC is externally coupled to the display device. The charge pump circuit is disposed on the FPC for generating at least an output voltage to the driving circuit according to an input voltage. The charge pump circuit has at least one control line coupled to the driving circuit for receiving a control signal generated from the driving circuit, and the charge pump circuit sets a pumping factor according to the control signal.