The present invention provides an image display system including a capacitive touch panel. The touch panel includes a plurality of groups of capacitor, and each group includes a number of capacitor modules. The touch panel also includes a processing circuit, a first scanning circuit, and a second scanning circuit. The first scanning circuit scans in turn each group. The second scanning circuit scans in turn each capacitor module of a particular group of capacitor. Then the processing circuit generates an input signal associated with a position on the touch panel.