the power management IC comprises a first identification pin, and the first identification pin is connected to the drive IC;

when the power management IC is turned on, the power management IC transmits identification information to the drive IC through the first identification pin to enable the drive IC to identify the power management IC and pair with the power management IC;

the identification information is first pulse signals, and the drive IC is configured to determine a type or a brand of the power management IC connected to the drive IC based on a quantity of pulses in the first pulse signals;

the drive IC comprises a plurality of storage registers corresponding to a plurality of power management ICs respectively, each of the plurality of power management IC comprises a first Look Up Table (LUT); each of the storage registers stores a second Look Up Table (LUT) paired with a corresponding first LUT of the power management IC;

in a process of pairing the drive IC with the power management IC, the drive IC is configured to identify the power management IC according to the identification information and select the second LUT in a corresponding storage register to pair with the first LUT of the power management IC;

the drive IC further comprises a control signal transmitting pin connected to the power management IC, and the drive IC is configured to generate a control signal according to the identification information of the power management IC and transmit the control signal to the power management IC through the control signal transmitting pin;

the control signal comprises a plurality of successive pulse signals, each of the plurality of successive pulse signals comprises a predetermined quantity of pulses; the plurality of successive pulse signals corresponds to a plurality of power supply pins of the power management IC respectively, and each of the plurality of successive pulse signals controls an output voltage of a corresponding power supply pin of the plurality of power supply pins;

the first LUT in each power management IC comprises a mapping relationship between the quantity of pulses of each of the plurality of successive pulse signals of the control signal and the output voltage of each power supply pin of the plurality of power supply pins;

the power management IC is configured to adjust the output voltage of a corresponding power supply pin to match a voltage corresponding to the quantity of pulses in the first LUT according to the quantity of pulses in each of the plurality of successive pulse signals; and

the power supply pin is configured to supply power to the drive IC with the adjusted output voltage.