Patent ID: 8194060

Claim:
A display system, comprising: a display device; a driving circuit, disposed on the display device, for driving the display device; a flexible printed circuit (FPC), externally coupled to the display device; and a charge pump circuit, disposed on the FPC, for generating at least an output voltage to the driving circuit according to an input voltage, wherein the charge pump circuit comprises: a first capacitor, having a first end and a second end; a second capacitor, having a first end and a second end; a first switch, coupled between the input voltage and the first end of the first capacitor; a second switch, coupled between a reference voltage and the second end of the second capacitor; a third switch, coupled between the output voltage and the first end of the first capacitor; a fourth switch, coupled between the input voltage and the second end of the first capacitor; a fifth switch, coupled between the output voltage and the first end of the second capacitor; a sixth switch, coupled between the input voltage and the second end of the second capacitor; and a seventh switch, coupled between the second end of the first capacitor and the first end of the second capacitor; wherein during a charging stage, the first switch, the second switch, and the seventh switch are turned on while the third switch, the fourth switch, the fifth switch, and the sixth switch are turned off; and during a pumping stage, the third switch, the fourth switch, the fifth switch, and the sixth switch are turned on while the first switch, the second switch, and the seventh switch are turned off.