The present invention discloses a plasma display panel which can improve screen quality, by dividing a rear substrate into a plurality of regions and by varying a structure of cells in each region. The shield member includes a low-melting-point metal or a low-melting point alloy provided at least in the forward shield portion. A retainer is mountable in the housing to latch the endform in the housing. The first active region and the second active region are corresponding active regions represented by a same component of a same circuit diagram representing both the first standard cell and the second standard cell. When the lifting system raises the ram member above the preload position, ambient air substantially freely flows into and out of the housing chamber through the vent port.