sentences:  A capacitor containing logic one begins to discharge when the voltage at the access transistor's gate terminal is above VCCP.If the capacitor contains a logic zero, it begins to discharge when the gate terminal voltage is above VTH.Up until the mid-1980s, the capacitors in DRAM cells were co-planar with the access transistor (they were constructed on the surface of the substrate), thus they were referred to as "planar" capacitors.