Brightness stabilizing control of a VF display.

摘要

A VF display (14) control apparatus (40) operated directly from an automotive storage battery (10) in which the display brightness variation is minimized by controlling the relationship between the anode (20) and grid (18) voltages in relation to the fluctuation of the battery voltage. The anodes (20) of the display are operated substantially at the battery voltage, and the grid voltage is reduced in relation to the amount by which the anode (supply) voltage exceeds the nominal open-circuit terminal voltage of the battery.