VACUUM FLUORESCENT DISPLAY(VFD) DRIVING CIRCUIT, ESPECIALLY INCLUDING A CONTROL CIRCUIT FOR VALIDATING OR INVALIDATING THE OUTPUT OF THE FILAMENT DRIVING UNIT AT A PROPER TIMING

摘要

PURPOSE: A vacuum fluorescent display(VFD) driving circuit is provided to improve convenience and reliability of a vacuum fluorescent display(VFD) using a pulse driving method of a filament. CONSTITUTION: A vacuum fluorescent display(VFD) has a filament(11) and a grid electrode(12) and a segment electrode(13). The VFD driving circuit(20) has a filament driving unit driving the filament, and a grid driving unit pulse-driving the grid electrode, and a segment driving unit pulse-driving the segment electrode. A control unit(40) makes an output of the filament driving unit valid or invalid at a proper timing. The control unit outputs a pulse driving signal to pulse-drive the filament.