Okamoto & Benedicto LLP
Control device and LED light emitting device using the control device
The present invention relates to a control device of a light emitting device that includes a plurality of LED rows formed of a plurality of LEDs sequentially connected in series. The control device includes: a plurality of switches respectively connected to the plurality of LED rows and sequentially transmitting a detection voltage of each of the plurality of LED rows, wherein the detection voltage corresponds to an output voltage applied to the plurality of LED rows; a comparator receiving the plurality of detection voltages, and generating a clock control signal according to a result of comparison with a predetermined reference; a clock signal generator generating a clock signal having a period that is changed according to the clock control signal; and a shift register that controls switching operations of the plurality of switches according to the clock signal.
Fairchild Korea Semiconductor Ltd.
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Juho Eunchul Duckki
Kim Kang Kwon