US 12,228,454 B2
Light detection module, light detection method and display device
Xinshe Yin, Beijing (CN); Hui Zhao, Beijing (CN); and Xinbin Han, Beijing (CN)
Assigned to BOE TECHNOLOGY GROUP CO., LTD., Beijing (CN)
Appl. No. 18/005,665
Filed by BOE TECHNOLOGY GROUP CO., LTD., Beijing (CN)
PCT Filed Nov. 25, 2021, PCT No. PCT/CN2021/133292
§ 371(c)(1), (2) Date Jan. 16, 2023,
PCT Pub. No. WO2023/092424, PCT Pub. Date Jun. 1, 2023.
Prior Publication US 2024/0263999 A1, Aug. 8, 2024
Int. Cl. G01J 3/46 (2006.01); H03F 3/45 (2006.01)
CPC G01J 3/46 (2013.01) [H03F 3/45475 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A light detection module, comprising N light sensing circuits, a control circuit, a conversion circuit and a detection circuit; N being a positive integer; wherein
the N light sensing circuits respectively sense light signals of different colors to generate corresponding photocurrents;
the control circuit is configured to control to provide the photocurrents generated by the light sensing circuits to the conversion circuit in a time division manner, and to control a transfer coefficient of the conversion circuit;
the conversion circuit is configured to convert the photocurrent according to the transfer coefficient to obtain an analog output voltage;
the detection circuit is configured to obtain characteristics of the light signal according to the analog output voltage;
wherein the control circuit comprises a light sensing control sub-circuit and a sampling control sub-circuit; the conversion circuit comprises a sampling sub-circuit and M conversion sub-circuits; the sampling sub-circuit includes M sampling resistors; M is a positive integer;
an input end of an mth conversion sub-circuit is electrically connected to an mth sampling resistor; m is a positive integer less than or equal to M;
the light sensing control sub-circuit is configured to control to provide the photocurrents generated by the light sensing circuits to the sampling control sub-circuit in a time division manner through a current supply end under the control of a light sensing control signal;
the sampling control sub-circuit is configured to control the current supply end to provide the photocurrents to the input ends of the conversion sub-circuits in a time division manner under the control of a sampling control signal;
the conversion sub-circuit is configured to convert a photocurrent when the input end of the conversion sub-circuit receives the photocurrent, to obtain the analog output voltage.