Pixel circuit and driving method thereof, array substrate and display device

A pixel circuit, comprising a light-emitting element, a driving sub-circuit, a scanning sub-circuit, and a carrier releasing sub-circuit;

• wherein the driving sub-circuit is connected to a first electrode of the light-emitting element, and the driving sub-circuit is configured to store a driving voltage and control a magnitude of a current passing through the light-emitting element according to the driving voltage;
• the scanning sub-circuit is connected to the driving sub-circuit, and the scanning sub-circuit is configured to update the driving voltage stored by the driving sub-circuit during an effective period of a first scanning signal;
• and
• the carrier releasing sub-circuit is connected to a second electrode of the light-emitting element, and the carrier releasing sub-circuit is configured to provide a reverse bias voltage to the second electrode of the light-emitting element during an effective period of a second scanning signal, the first electrode and the second electrode of the light-emitting element are one of a positive electrode and a negative electrode respectively, and the effective period of the second scanning signal is prior to the effective period of the first scanning signal in each display period.