Patent ID: 11881164
Assignee: BOE TECHNOLOGY GROUP CO., LTD.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 0:
1. A pixel circuit, comprising a data writing circuit, a driving circuit, a reset circuit, a light emission control circuit, and a compensation circuit,
wherein the driving circuit comprises a control terminal, a first terminal and a second terminal, and the driving circuit is configured to control a driving current, which flows through the first terminal and the second terminal and is used to drive a light emitting element to emit light;
the data writing circuit is connected with the control terminal of the driving circuit, and is configured to write a data signal to the control terminal of the driving circuit in response to a scan signal; and
the compensation circuit is connected with the control terminal of the driving circuit, the first terminal of the driving circuit, the second terminal of the driving circuit and a first voltage terminal, and the compensation circuit is configured to store the data signal written by the data writing circuit, to compensate the driving circuit, and to adjust, by coupling, a voltage of the second terminal of the driving circuit;
the reset circuit is connected with a reset voltage terminal and a first terminal of the light emitting element, and the reset circuit is configured to apply a reset voltage to the first terminal of the light emitting element in response to a reset signal; and the reset signal is synchronized with the scan signal;
the reset circuit comprises a fourth transistor;
a gate electrode of the fourth transistor is configured to be connected with a scan line to receive the scan signal which functions as the reset signal, a first electrode of the fourth transistor is configured to be connected with the reset voltage terminal to receive the reset voltage, and a second electrode of the fourth transistor is configured to be connected with the first terminal of the light emitting element; and
the compensation circuit comprises a first compensation sub-circuit and a second compensation sub-circuit, the first compensation sub-circuit comprises a first storage capacitor, the second compensation sub-circuit comprises a second storage capacitor, and the driving current is related to a capacitance value of the first storage capacitor and a capacitance value of the second storage capacitor,
wherein a value of the driving current IDLED is equal to ½*K*((Vdata−Vref)C2/(C1+C2))2, where K is a constant value, Vdata indicates the data signal, Vref indicates a reference voltage, C1 indicates the capacitance value of the first storage capacitor, and C2 indicates the capacitance value of the second storage capacitor, and
wherein the data writing circuit and the reset circuit are configured to be turned on during a whole data writing phase,
wherein the light emission control circuit is connected with the second terminal of the driving circuit and the first terminal of the light emitting element, and the light emission control circuit is configured to apply the driving current to the light emitting element in response to a light emission control signal, and
wherein the reset circuit is configured to apply the reset voltage to the second terminal of the driving circuit and the light emitting element through the light emission control circuit during a reset phase, so that the light emitting element, the first storage capacitor, and the second storage capacitor are discharged, and the driving circuit is turned on.