| 摘要 |
PROBLEM TO BE SOLVED: To always keep effective voltage to be supplied to a filament constant irrespective of unevenness of elements, temperature changes and variations in power supply voltage in DC pulse driving of the filament of a vacuum fluorescent display. SOLUTION: The pulse width and voltage to be supplied to the filament is fed back to a microcomputer, and the width of the pulses outputted from the microcomputer is varied by the fed-back value. |
