A synchronous voltage regulation circuit having an energy storage circuit for controlling the output signal is disclosed. A preferred method calls for a post processing of collected data sample sets and position values to yield imaging data representing a plurality of evenly spaced and parallel imaging lines, which may then be processed to determine one or more print quality attributes. The front substrate includes a plurality of display electrodes, each having scan electrode and sustain electrode. By coupling the elements in the diagonal fashion, oven shells of different dimensions and shapes may be made at a reduced cost and assembly is much convenient.