A pixel circuit and a driving method thereof, and a display panel are provided. The pixel circuit includes a driver module, a signal supply terminal, a compensation module, and a coupling module. The compensation module is configured to compensate for a threshold voltage of the driver module in a compensation phase. The signal supply terminal supplies a fixed voltage to the coupling module in an initialization phase and supplies a data voltage to the coupling module in a data writing phase, the coupling module is configured to couple a voltage containing information about the data voltage to a control terminal of the driver module via the compensation module in the data writing phase, where the data writing phase is later than the compensation phase.