Patent ID: 7696990

Claim:
An LED driving circuit, receiving a data signal according to a clock signal, comprising: a rectification unit for receiving an AC and outputting a DC; a voltage supply unit coupled to the rectification unit, outputting at least one voltage threshold according to the DC; a comparator unit, receiving the one or more voltage thresholds, wherein the comparator unit compares the data signal with the voltage thresholds so as to output a mode selection signal, and the data signal is an instruction data or an illumination display data; a register unit having an instruction register and a data register, wherein the register unit is coupled to the comparator unit, the register unit is controlled by the mode selection signal and performs an instruction mode or a data transmission mode according to the clock signal, and the instruction register stores the instruction data under the instruction mode and the data register stores the illumination display data under the data transmission mode, wherein, when the data register is full, the register unit outputs a secondary data signal; a voltage coupling unit coupled to the register unit, for receiving the secondary data signal and adjusting the voltage level of the secondary data signal, so that the voltage level of the secondary data signal is equal to the voltage level of the data signal; and a driving unit coupled to the register unit, wherein the driving unit is controlled by the instruction data and drives an LED module according to the illumination display data.