referring to fig9 a through 9 e a pdp driving method according to the second preferred embodiment of the present invention will be described fig9 a through 9 e respectively show a current path of each mode and a corresponding reset waveform according to the second preferred embodiment of the present invention when the switch ys is turned off and the erase switch yer and the switches sc_h ysp and yg are turned on the current flows according to a path in order of the switch sc_h the switch ysp the erase switch yer and the switch yg and the potential of the scan electrode gradually falls in the ramp waveform pe the erase switch yer includes a mosfet having a gate and a drain between which a capacitor is coupled to flow the constant current and accordingly a ramp waveform is applied to the scan electrode under the influence of a panel capacitor in the second mode the erase switch yer and the switches ysp and sc_h are turned off and the switches ys and sc_l are turned on to form a current path in order of the switch ys the body diode of either the main path switch yp amp yfr or the erase switch yer and the switch sc_l and the potential of the scan electrode instantly rises to the voltage of vs therefore the voltage at the other end of the capacitor cset instantly rises to the voltage of.