The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 19, 2021
Filed:
Jun. 30, 2020
Apple Inc., Cupertino, CA (US);
Tong Chen, Cupertino, CA (US);
Dong Zheng, Los Altos, CA (US);
Mark T. Winkler, San Jose, CA (US);
Stephen N. Sweet, San Jose, CA (US);
Tsu-Hui Lin, San Jose, CA (US);
Wenrui Cai, San Jose, CA (US);
Apple Inc., Cupertino, CA (US);
Abstract
An optical sensing system includes a transmitter side and a receiver side, and is configured to be positioned below a display of an electronic device. The transmitter side includes a light emitter, a temperature sensor, and a photodiode. The receiver side includes a photodiode and a temperature sensor. The optical sensing system includes an application-specific integrated circuit that leverages the temperature sensors, the photodiodes, and one or more signal filters such as a high-pass filter to perform multiple field calibrations of the optical sensing system, thereby improving accuracy and precision thereof.