LED control circuit

Details LED control circuit LED control circuit

2007-08-14

2007-08-14

Chen, Shih-Chao (Department: 2821)

Electric lamp and discharge devices: systems

Plural power supplies

Plural cathode and/or anode load device

C345S600000

Reexamination Certificate

active

11199710

ABSTRACT:
An LED control circuit for controlling a plurality of LEDs with different emission colors comprises 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 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 its corresponding LED, an analog signal displaying intensity corresponding to a product of the output signal and the brightness data, and a driving circuit which drives its corresponding LED according to the analog signal output from the signal generation circuit, to gradually and simultaneously change the brightness of the LEDs in accordance with the count value.

REFERENCES:
patent: 6317138 (2001-11-01), Yano et al.
patent: 6472946 (2002-10-01), Takagi
patent: 6577287 (2003-06-01), Havel
patent: 6646654 (2003-11-01), Takagi

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