US 12,243,486 B2
Pixel circuits and driving methods thereof, display panels and display apparatuses
Changlong Yuan, Beijing (CN); Yingsong Xu, Beijing (CN); and Xiaoxiao Wang, Beijing (CN)
Assigned to Chengdu BOE Optoelectronics Technology Co., Ltd., Sichuan (CN); and BOE Technology Group Co., Ltd., Beijing (CN)
Appl. No. 17/914,192
Filed by Chengdu BOE Optoelectronics Technology Co., Ltd., Sichuan (CN); and BOE Technology Group Co., Ltd., Beijing (CN)
PCT Filed Oct. 28, 2021, PCT No. PCT/CN2021/126897
§ 371(c)(1), (2) Date Sep. 23, 2022,
PCT Pub. No. WO2022/179153, PCT Pub. Date Sep. 1, 2022.
Claims priority of application No. 202110221188.2 (CN), filed on Feb. 26, 2021.
Prior Publication US 2023/0120335 A1, Apr. 20, 2023
Int. Cl. G09G 3/325 (2016.01); G09G 3/20 (2006.01); G09G 3/36 (2006.01)
CPC G09G 3/325 (2013.01) [G09G 3/2025 (2013.01); G09G 3/3659 (2013.01); G09G 2300/0408 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A pixel circuit, comprising:
a light-emitting element;
a first voltage terminal;
a data signal line;
a light emission control sub-circuit, connected with the first voltage terminal, the data signal line and the light-emitting element; and
a photoelectric sensing sub-circuit, connected with the first voltage terminal and the data signal line;
wherein, in a first time period, the data signal line is configured to transmit a display data signal which is configured to control the light emission control sub-circuit to provide a drive current for the light-emitting element; and
in a second time period, the data signal line is configured to transmit a sensing data signal obtained by the photoelectric sensing sub-circuit;
wherein the photoelectric sensing sub-circuit comprises a light-sensing element and a switching element, and the light-sensing element and the switching element are connected in series between the first voltage terminal and the data signal line;
in the first time period, the switching element is in an open state; and
in the second time period, the switching element is in a closed state;
wherein the light-sensing element is a first transistor, which is in the open state;
wherein the light emission control sub-circuit comprises a data write sub-circuit, a drive sub-circuit, and a reset sub-circuit;
the data write sub-circuit comprises a data signal input terminal for receiving the display data signal and a first power supply signal input terminal for receiving a first power supply signal, the data write sub-circuit is connected with a connection node which is connected with the drive sub-circuit, and the data signal input terminal is connected with the data signal line;
the drive sub-circuit is connected with the first power supply signal input terminal and the light-emitting element, and configured to provide a drive current for the light-emitting element;
the light-emitting element is further connected with a second power supply signal input terminal for receiving a second power supply signal; the second power supply signal has a lower level than the first power supply signal; and
the reset sub-circuit comprises a reset control terminal for receiving a reset signal and a third power supply signal input terminal for receiving a third power supply signal, the reset sub-circuit is connected with the connection node; and the third power supply signal has a lower level than the first power supply signal;
wherein the reset sub-circuit completes a reset by inputting the third power supply signal into the light-emitting element and the data write sub-circuit;
wherein the switching element of the photoelectric sensing sub-circuit is a second transistor;
wherein a first electrode of the first transistor is connected to the first voltage terminal, and a second electrode of the first transistor is connected to a gate electrode of the first transistor and a second electrode of the second transistor;
wherein a gate electrode of the second transistor is connected to a switching control terminal to receive a switching control signal; and a first electrode of the second transistor is directly connected to the data signal input terminal of the data write sub-circuit.