| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a display device for improving light amount variation accompanying voltage fluctuation without generating noise influencing equipment. <P>SOLUTION: The display device has; a control circuit 13 for outputting a control signal of a power source voltage level for display control to a fluorescent indication tube 12 by supplying power source voltage to a power source terminal (VDD); a voltage lowering detection part 14 for detecting whether supplied power source voltage lowers down to a preset voltage value; a reference potential adjusting part 15 for holding a reference potential terminal (VSS) level at reference potential when indicating that it lowers down to a set voltage value by setting the reference potential terminal (VSS) level of the control circuit 13 to prescribed higher potential than reference potential when indicating that a detection signal DT14 of the voltage lowering detection part does not lower down to the set voltage value; and a voltage holding part 16 for holding filament voltage at rated voltage regardless of lowering down to the set voltage value or not lowering down to it. <P>COPYRIGHT: (C)2008,JPO&INPIT |
