The present application discloses a voltage-supply circuit including a voltage-supply sub-circuit coupled to a plurality of common-electrode blocks respectively via a plurality of signal lines in a display panel and configured to provide an initializing common-electrode voltage to each common-electrode block via a respective one signal line during an initialization period of a display time. The voltage-supply circuit further includes a voltage-feedback sub-circuit configured to collect a feedback voltage from the respective one signal line during the initialization period. Additionally, the voltage-supply circuit includes a voltage-comparison sub-circuit configured to compare the feedback voltage and a standard common-electrode voltage and to cause a generation of a trigger signal when a difference between the feedback voltage and the standard common-electrode voltage changes polarity. The trigger signal drives the voltage-supply sub-circuit in a normal output period to supply the standard common-electrode voltage via the respective one signal line to onecorresponding common-electrode block.