| 摘要 |
PURPOSE:To eliminate the variance of the lighting of a plurality of light-emitting diodes with the variation of supply voltage, and to improve the reliability of a display system by inserting diodes for regulating voltage so that the number of the light-emitting diodes in each series body is made the same. CONSTITUTION:One end of a resistor 5 for regulating DC is connected to a DC power supply 4 for a light-emitting display system, and the series bodies 1, 2 of the light-emittig diodes are connected in parallel with the other end of the resistor 5. A light-emitting diode 6 for regulating voltage is inserted to one series body 1 so that the number of the light-emitting diodes of the series bodies 1, 2 is made the same. The light-emitting diode 6 is arranged at a position hidden from the surface of an operation panel. The variance of the lighting of the light- emitting diodes of each series body 1, 2 with the variation of the voltage Vcc of the DC power supply 4 is eliminated, and the fine view and reliability of the light-emitting display system are improved. |
