| 摘要 |
<p>PROBLEM TO BE SOLVED: To eliminate change of brightness by making constant the impressed voltage for an LED, a lamp or the like, despite an impedance of a display power supply circuit or the like by a simple program processing. SOLUTION: In a display device of lighting selectively a plurality of LED's 15 and lamps 16 through a display control circuit 17, when a CPU 11 controls an output voltage Vo of a display power supply circuit 13 against each light source, the voltage fluctuation value changing corresponding to a lighted number of each light source is memorized as an offset value to a table in advance, and this offset value is added to a control signal b for controlling.</p> |
