Patent ID: 7256552

Claim:
An LED control circuit for controlling a plurality of LEDs with different emission colors comprising, with respect to each of the plurality of LEDs; a counter which increments or decrements a count value at a predetermined clock in response to a count start signal externally supplied; a signal conversion circuit which converts the count value from the counter into an analog signal displaying intensity corresponding to the count value and outputs the analog signal as an output signal; a signal generation circuit which generates, based on the output signal from the signal conversion circuit and brightness data externally specified to corresponding one of the plurality of LEDs, an analog signal displaying intensity corresponding to a product of the output signal and the corresponding brightness data, and outputs the generated analog signal; and a driving circuit which drives corresponding one of the plurality of LEDs according to the analog signal output from the signal generation circuit; wherein brightness levels of the plurality of LEDs are gradually and simultaneously changed according to the count value.