Light-emitting diode (LED) driving circuit avoiding leakage current in series connected light-emitting groups

A driving circuit, having a power-line communication input pin, a data input pin and an output pin and comprising a light emission control sub-circuit, an amplification sub-circuit and a low-grayscale control sub-circuit, wherein

• the light emission control sub-circuit is respectively coupled to the power-line communication input pin, the data input pin and the output pin, the light emission control sub-circuit is configured to generate a driving signal based on a power communication signal provided by the power-line communication input pin and an address signal provided by the data input pin, and output the driving signal through the output pin, the output pin is configured to be coupled to a first electrode of a light-emitting unit group, and a second electrode of the light-emitting unit group is coupled to a power supply terminal;
• the amplification sub-circuit is respectively coupled to a reference power source terminal, a first power source terminal, a second power source terminal and the low-grayscale control sub-circuit, and the amplification sub-circuit is configured to amplify a reference power source signal provided by the reference power source terminal based on a first power source signal provided by the first power source terminal and a second power source terminal provided by the second power source terminal, and transmit the amplified reference power source signal to the low-grayscale control sub-circuit, a voltage of the amplified reference power source signal being not less than a voltage of a power supply signal provided by the power supply terminal;
• and
• the low-grayscale control sub-circuit is further respectively coupled to an enabling control terminal and the output pin, and the low-grayscale control sub-circuit is configured to control a connection and a disconnection between the amplification sub-circuit and the output pin based on an enabling control signal provided by the enabling control terminal.