A backlight control circuit, wherein the backlight control circuit is configured to drive a plurality of light string groups, each light string group comprises a plurality of light strings connected in parallel, and the backlight control circuit comprises: a driver circuit, wherein the driver circuit comprises a feedback output terminal and a plurality of channel ports; each of the channel ports is configured to be coupled to a first terminal of at least one light string group of the plurality of light string groups; the driver circuit is configured to obtain a voltage Vch of each channel port, and enable the feedback output terminal to provide a current feedback signal for a power conversion circuit based on the voltage Vch, wherein the driver circuit is specifically configured to: compare the voltage Vch of each channel port with a first preset voltage VL and a second preset voltage VH, wherein VL<VH; and when the voltage Vch of any channel port is lower than the first preset voltage VL, enable the feedback output terminal to provide a first current I1 as the current feedback signal, to increase a supply voltage of the power conversion circuit; when the voltages Vch of all the channel ports are higher than the second preset voltage VH, enable the feedback output terminal to provide a second current I2 as the current feedback signal, to decrease the supply voltage of the power conversion circuit, wherein the first current I1 and the second current I2 have opposite directions; and the power conversion circuit, coupled to the feedback output terminal and comprising a voltage output terminal, wherein the voltage output terminal is configured to provide a supply voltage for a second terminal of each light string group, wherein the power conversion circuit is configured to perform voltage conversion on an input voltage, increase the supply voltage in response to the feedback output terminal providing the first current I1 as the current feedback signal, and decrease the supply voltage in response to the feedback output terminal providing the second current I2 as the current feedback signal. a driver circuit, wherein the driver circuit comprises a feedback output terminal and a plurality of channel ports; each of the channel ports is configured to be coupled to a first terminal of at least one light string group of the plurality of light string groups; the driver circuit is configured to obtain a voltage Vch of each channel port, and enable the feedback output terminal to provide a current feedback signal for a power conversion circuit based on the voltage Vch, wherein the driver circuit is specifically configured to: compare the voltage Vch of each channel port with a first preset voltage VL and a second preset voltage VH, wherein VL<VH; and when the voltage Vch of any channel port is lower than the first preset voltage VL, enable the feedback output terminal to provide a first current I1 as the current feedback signal, to increase a supply voltage of the power conversion circuit; when the voltages Vch of all the channel ports are higher than the second preset voltage VH, enable the feedback output terminal to provide a second current I2 as the current feedback signal, to decrease the supply voltage of the power conversion circuit, wherein the first current I1 and the second current I2 have opposite directions; and the power conversion circuit, coupled to the feedback output terminal and comprising a voltage output terminal, wherein the voltage output terminal is configured to provide a supply voltage for a second terminal of each light string group, wherein the power conversion circuit is configured to perform voltage conversion on an input voltage, increase the supply voltage in response to the feedback output terminal providing the first current I1 as the current feedback signal, and decrease the supply voltage in response to the feedback output terminal providing the second current I2 as the current feedback signal. compare the voltage Vch of each channel port with a first preset voltage VL and a second preset voltage VH, wherein VL<VH; and when the voltage Vch of any channel port is lower than the first preset voltage VL, enable the feedback output terminal to provide a first current I1 as the current feedback signal, to increase a supply voltage of the power conversion circuit; when the voltages Vch of all the channel ports are higher than the second preset voltage VH, enable the feedback output terminal to provide a second current I2 as the current feedback signal, to decrease the supply voltage of the power conversion circuit, wherein the first current I1 and the second current I2 have opposite directions; and the power conversion circuit, coupled to the feedback output terminal and comprising a voltage output terminal, wherein the voltage output terminal is configured to provide a supply voltage for a second terminal of each light string group,