US 12,293,712 B2
Pixel circuit and driving method thereof, display panel, and display device
Yao Huang, Beijing (CN); and Cong Liu, Beijing (CN)
Assigned to Chengdu BOE Optoelectronics Technology Co., Ltd., Chengdu (CN); and BOE Technology Group Co., Ltd., Beijing (CN)
Appl. No. 18/026,913
Filed by Chengdu BOE Optoelectronics Technology Co., Ltd., Sichuan (CN); and BOE Technology Group Co., Ltd., Beijing (CN)
PCT Filed Apr. 22, 2022, PCT No. PCT/CN2022/088377
§ 371(c)(1), (2) Date Mar. 17, 2023,
PCT Pub. No. WO2023/201678, PCT Pub. Date Oct. 26, 2023.
Prior Publication US 2024/0304141 A1, Sep. 12, 2024
Int. Cl. G09G 3/3233 (2016.01); G09G 3/3266 (2016.01); G09G 3/3291 (2016.01)
CPC G09G 3/3233 (2013.01) [G09G 3/3266 (2013.01); G09G 3/3291 (2013.01); G09G 2300/0842 (2013.01); G09G 2310/061 (2013.01); G09G 2310/08 (2013.01); G09G 2320/0233 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A pixel circuit, comprising: a data writing circuit, a driving circuit, and a compensation circuit; wherein
the driving circuit comprises a control terminal, a first terminal, and a second terminal,
the compensation circuit is connected to the control terminal, the first terminal, and the second terminal of the driving circuit, and is configured to write a compensation voltage based on a first reset voltage into the control terminal of the driving circuit under control of a compensation control signal,
the data writing circuit is connected to the control terminal of the driving circuit and is configured to write a coupling voltage based on a data voltage into the control terminal of the driving circuit under control of a scanning signal, and
the driving circuit is configured to control a driving current for driving a light-emitting element to emit light under control of a voltage applied to the control terminal of the driving circuit,
wherein the data writing circuit comprises a first data writing sub-circuit and a second data writing sub-circuit, and the scanning signal comprises a first scanning sub-signal and a second scanning sub-signal,
the first data writing sub-circuit is connected to a data writing node and is configured to write the data voltage into the data writing node under control of the first scanning sub-signal, and
the second data writing sub-circuit is connected to the data writing node and the control terminal of the driving circuit, and is configured to write the coupling voltage based on a voltage of the data writing node into the control terminal of the driving circuit under control of the second scanning sub-signal.
 
13. A pixel circuit comprising: a data writing circuit, a driving circuit, a compensation circuit, a storage circuit, a first reset circuit, a second reset circuit, a first light-emitting control circuit, and a second light-emitting control circuit; wherein
the driving circuit comprises a driving transistor,
the data writing circuit comprises a first data writing sub-circuit and a second data writing sub-circuit, the first data writing sub-circuit comprises a first data writing transistor, and the second data writing sub-circuit comprises a second data writing transistor and a first capacitor,
a first electrode of the first data writing transistor is configured to receive a data voltage, a second electrode of the first data writing transistor is connected to a data writing node, a gate electrode of the first data writing transistor is configured to receive a first scanning sub-signal, a first electrode of the first capacitor is connected to the data writing node, a second electrode of the first capacitor is connected to a first electrode of the second data writing transistor, a second electrode of the second data writing transistor is connected to a gate electrode of the driving transistor, and a gate electrode of the second data writing transistor is configured to receive a second scanning sub-signal;
the compensation circuit comprises a first compensation sub-circuit and a second compensation sub-circuit, the first compensation sub-circuit comprises a first compensation transistor, and the second compensation sub-circuit comprises a second compensation transistor,
a first electrode of the first compensation transistor is configured to receive a first reset voltage, a second electrode of the first compensation transistor is connected to a second electrode of the driving transistor, and a gate electrode of the first compensation transistor is configured to receive a first compensation control sub-signal; a first electrode of the second compensation transistor is connected to a first electrode of the driving transistor, a second electrode of the second compensation transistor is connected to the gate electrode of the driving transistor, and a gate electrode of the second compensation transistor is configured to receive a second compensation control sub-signal;
the first reset circuit comprises a first reset transistor, a first electrode of the first reset transistor is configured to receive a second reset voltage, a second electrode of the first reset transistor is connected to the data writing node, and a gate electrode of the first reset transistor is configured to receive a first reset control signal,
the storage circuit comprises a second capacitor, a first electrode of the second capacitor is connected to the gate electrode of the driving transistor, and a second electrode of the second capacitor is connected to a first terminal of a light-emitting element,
the second reset circuit comprises a second reset transistor, a first electrode of the second reset transistor is connected to the first terminal of the light-emitting element, a second electrode of the second reset transistor is configured to receive a third reset voltage, and a gate electrode of the second reset transistor is configured to receive a second reset control signal;
the first light-emitting control circuit comprises a first light-emitting control transistor, a gate electrode of the first light-emitting control transistor is configured to receive a first light-emitting control signal, a first electrode of the first light-emitting control transistor is connected to the second electrode of the driving transistor, and a second electrode of the first light-emitting control transistor is connected to the first terminal of the light-emitting element; and
the second light-emitting control circuit comprises a second light-emitting control transistor, a gate electrode of the second light-emitting control transistor is configured to receive a second light-emitting control signal, a first electrode of the second light-emitting control transistor is connected to a first power supply line, and a second electrode of the second light-emitting control transistor is connected to the first electrode of the driving transistor.
 
15. A driving method applied to a pixel circuit,
wherein the pixel circuit comprises a data writing circuit, a driving circuit, and a compensation circuit,
the driving circuit comprises a control terminal, a first terminal, and a second terminal,
the compensation circuit is connected to the control terminal, the first terminal, and the second terminal of the driving circuit, and is configured to write a compensation voltage based on a first reset voltage into the control terminal of the driving circuit under control of a compensation control signal,
the data writing circuit is connected to the control terminal of the driving circuit and is configured to write a coupling voltage based on a data voltage into the control terminal of the driving circuit under control of a scanning signal, and
the driving circuit is configured to control a driving current for driving a light-emitting element to emit light under control of a voltage applied to the control terminal of the driving circuit,
wherein the data writing circuit comprises a first data writing sub-circuit and a second data writing sub-circuit, and the scanning signal comprises a first scanning sub-signal and a second scanning sub-signal,
the first data writing sub-circuit is connected to a data writing node and is configured to write the data voltage into the data writing node under control of the first scanning sub-signal, and
the second data writing sub-circuit is connected to the data writing node and the control terminal of the driving circuit, and is configured to write the coupling voltage based on a voltage of the data writing node into the control terminal of the driving circuit under control of the second scanning sub-signal,
the driving method comprises:
in a compensation stage, writing the compensation voltage based on the first reset voltage into the control terminal of the driving circuit;
in a data writing stage, writing the coupling voltage based on the data voltage into the control terminal of the driving circuit; and
in a light-emitting stage, driving the light-emitting element to emit light based on the voltage applied to the control terminal of the driving circuit.