US 12,020,501 B2
Sensing circuit, detection control method, fingerprint identification module and display apparatus
Chao Chen, Beijing (CN); Shuai Xu, Beijing (CN); Wenchen Zhang, Beijing (CN); Bin Zhao, Beijing (CN); Xiaoqian Du, Beijing (CN); Luyao Fan, Beijing (CN); Binbin Xu, Beijing (CN); Zhenqian Zhao, Beijing (CN); Junyu Wu, Beijing (CN); and Jingshu Zhang, Beijing (CN)
Assigned to Beijing BOE Sensor TechnologyCo., Ltd., Beijing (CN); and BOE Technology Group Co., Ltd., Beijing (CN)
Appl. No. 17/781,900
Filed by Beijing BOE Sensor Technology Co., Ltd., Beijing (CN); and BOE Technology Group Co., Ltd., Beijing (CN)
PCT Filed Jun. 18, 2021, PCT No. PCT/CN2021/100842
§ 371(c)(1), (2) Date Jun. 2, 2022,
PCT Pub. No. WO2022/261924, PCT Pub. Date Dec. 22, 2022.
Prior Publication US 2024/0161535 A1, May 16, 2024
Int. Cl. G06V 40/13 (2022.01); G06F 3/041 (2006.01); G06V 40/12 (2022.01); H01L 31/053 (2014.01); H03K 17/687 (2006.01)
CPC G06V 40/1318 (2022.01) [G06F 3/0412 (2013.01); G06V 40/1365 (2022.01); H01L 31/053 (2014.12); H03K 17/6871 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A sensing circuit, comprising: a photoelectric conversion element, an energy storage circuit, a switch control circuit, a discharge control circuit, and a voltage conversion circuit, wherein
a first terminal of the energy storage circuit is electrically connected to the photoelectric conversion element, and the energy storage circuit is configured to store electrical energy;
the photoelectric conversion element is configured to control a potential of the first terminal of the energy storage circuit according to a received optical signal;
the switch control circuit is electrically connected to a switch control line, the first terminal of the energy storage circuit and a conversion control node, and the switch control circuit is configured to control the first terminal of the energy storage circuit to be connected to or disconnected from the conversion control node under the control of a switch control signal provided by the switch control line;
the discharge control circuit is electrically connected to the conversion control node and a first voltage terminal, and the discharge control circuit is configured to control the conversion control node to be connected to or disconnected from the first voltage terminal under the control of a potential of the conversion control node; and
the voltage conversion circuit is electrically connected to the conversion control node, a second voltage terminal, a third voltage terminal and an output terminal, and the voltage conversion circuit is configured to control, under the control of a second voltage signal provided by the second voltage terminal and the potential of the conversion control node, a voltage signal outputted by the output terminal according to the second voltage signal and/or a third voltage signal provided by the third voltage terminal.