| 摘要 |
PROBLEM TO BE SOLVED: To reduce current consumption, and to supply requested prescribed currents to respective LEDs with different luminous colors to achieve an optimum luminance for each of the LEDs.SOLUTION: A circuit obtained by series-connecting a drive circuit 3 to a second LED circuit 1 side of a series circuit of a first LED circuit 1 and a second LED circuit 2, is connected between a first power supply terminal VIN and a second power supply terminal GND. A current requested to the second LED circuit 2 is set by the drive circuit 3. On the basis of a difference between a current requested to the first LED circuit 1 and the current requested to the second LED circuit 2, a positive or negative current is supplied to a node N1 commonly connected to the first LED circuit 1 and the second LED circuit 2.SELECTED DRAWING: Figure 1 |
