Pixel circuit, driving method thereof, and display device

A driving method, suitable for a pixel circuit comprising:

• a driving circuit, comprising a control terminal, a first terminal and a second terminal, and configured to control a magnitude of driving current flowing through the first terminal and the second terminal;
• a light-emitting element, configured to emit light upon being driven by the driving current, wherein the first terminal of the driving circuit is connected to a first electrode of the light-emitting element so as to supply the driving current to the light-emitting element;
• a first compensation circuit, configured to apply a reference signal to the control terminal of the driving circuit in response to a first compensation control signal, wherein the first compensation circuit comprises a first storage capacitor, and a first electrode of the first storage capacitor is electrically connected to the control terminal of the driving circuit, and a second electrode of the first storage capacitor is electrically connected to the first terminal of the driving circuit;
• and a second compensation circuit, comprising a second storage capacitor and a first switching transistor, wherein a first electrode of the first switching transistor is connected to a first electrode of the second storage capacitor, one of a second electrode of the first switching transistor and a second electrode of the second storage capacitor is connected to the first terminal of the driving circuit, and the other one of the second electrode of the first switching transistor and the second electrode of the second storage capacitor is connected to a constant voltage terminal, a gate electrode of the first switching transistor is configured to receive a second compensation control signal, and the second compensation circuit is configured to compensate the driving circuit in response to the second compensation control signal, wherein the first switching transistor is connected in series with the second storage capacitor to form a series circuit with the second electrode of the first switching transistor and the second electrode of the second storage capacitor at the two ends of the series circuit, and the second electrode of the first switching transistor and the second electrode of the second storage capacitor are not electrically connected with each other,
• wherein the driving method comprises:
• in a data writing stage, making the second compensation control signal be a turn-on signal to turn on the first switching transistor;
• upon entering a light-emitting stage from the data writing stage, making the second compensation control signal be switched from a turn-on signal to a turn-off signal to turn off the first switching transistor, wherein, in the light-emitting stage, the second compensation control signal remains as the turn-off signal;
• and
• in a compensation stage before the data writing stage, making the second compensation control signal be a turn-on signal to turn on the first switching transistor, and the second compensation circuit is configured to compensate the driving circuit in response to the second compensation control signal,
• wherein, in the compensation stage, the second electrode of the second storage capacitor receives a constant voltage from the constant voltage terminal.