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. 12, 2021
Filed:
Mar. 17, 2020
Facebook Technologies, Llc, Menlo Park, CA (US);
Michael Yee, Kirkland, WA (US);
Ramakrishna Chilukuri, San Jose, CA (US);
William Thomas Blank, Bellevue, WA (US);
Ilias Pappas, County Cork, IE;
FACEBOOK TECHNOLOGIES, LLC, Menlo Park, CA (US);
Abstract
A system includes a plurality of first LEDs, a plurality of second LEDs, a first controllable current source that is configured to generate a first bias current for driving a first one of the plurality of first LEDs and a plurality of first ones of the plurality of second LEDs, a first measurement circuit that is configured to measure a first current-voltage (I-V) performance characteristic of the first one of the plurality of first LEDs, and a lens that is arranged to receive light from the plurality of second LEDs. A property of the first bias current is determined as a function of at least two measurements of the first I-V performance characteristic that are acquired while the first bias current is applied to the first one of the plurality of first LEDs and the plurality of first ones of the plurality of second LEDs.