| 摘要 |
PURPOSE:To uniformalize the current varying rate of the LED of each series circuit by connecting a dummy LED or the diode having similar characteristics with the circuits which are prepared by dividing the plural LEDs. CONSTITUTION:There are connected between the power source terminals of voltage +E a series circuit A, which is composed of LEDs 1 and 2 and a resistor R1, and a series circuit B, which is composed of an LED 3, a DLED or a dummy LED and a resistor R2. In this circuit construction, the DLED to be used has the same characteristics as those of the LEDs 1-3 or may be a diode having similar characteristics to those of the LEDs. As a result, in case the voltage +E is varied, the current varying tates of the LEDs 1 and 2 become equal to that of the LED 3 so that the light varying rates of the LEDs 1 and 2 become equal to that of the LED 3. |
