Vacuum fluorescent display filament drive circuit

摘要

A drive circuit for controlling a vacuum fluorescent display is provided. A charge storage device is connected between signal ground or a voltage supply and a display element. One multiway switch or two single-position switches are connected to the display element opposite the charge storage device. In either configuration, the switch or switches are controlled by an oscillator which, by toggling the switch or switches, alternates the configuration of the circuit to charge or discharge the charge storage device through the display element. The charge storage device and the display element may be connected to a regulated voltage which is maintained at a potential above the grid voltage to reduce cross-talk in the display. The switching operation is break before make and produces an AC voltage across the display element.