the power supply circuit is coupled to the adapter circuit board, wherein the power supply circuit is configured to transmit a power supply voltage to the adapter circuit board;

the adapter circuit board is coupled to the plurality of light-emitting elements by wirings, wherein the adapter circuit board is configured to transmit the power supply voltage to each of the light-emitting elements; and

the voltage regulation circuit is coupled to the power supply circuit, wherein the voltage regulation circuit is configured to regulate, according to an ideal operating voltage corresponding to an operating current of each of the light-emitting elements under a target grayscale and a wiring voltage drop on the wiring coupled to each of the light-emitting elements, a magnitude of the power supply voltage output by the power supply circuit, in the case that the display panel displays a picture of the target grayscale,

wherein the voltage regulation circuit comprises: a main control chip and a voltage regulation sub-circuit; wherein

the main control chip is coupled to the voltage regulation sub-circuit, and the main control chip is configured to determine a target operating voltage of each of the light-emitting elements according to the ideal operating voltage corresponding to the operating current of each of the light-emitting elements under the target grayscale and the wiring voltage drop on the wiring coupled to each of the light-emitting elements, and transmit a feedback signal to the voltage regulation sub-circuit according to the target operating voltage of each of the light-emitting elements; and

the voltage regulation sub-circuit is coupled to the power supply circuit, and the voltage regulation sub-circuit is configured to regulate, according to the feedback signal, a magnitude of the power supply voltage output by the power supply circuit.