An AC Plasma display panel. In one embodiment of the invention, a plurality of ribs are formed on a rear substrate to define a plurality of non-equilateral hexagonal discharge spaces. A front substrate is opposite the rear substrate. A plurality of bus electrodes are formed on the front substrate, wherein each bus electrodes are zigzag-shaped and extend substantially in a first direction. A plurality of extending electrodes are formed on the front substrate, protruding to corresponding non-equilateral hexagonal discharge spaces, wherein the extending electrodes are substantially triangle-shaped, and bevel edges of the extending electrodes contact the bus electrodes respectively.