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:
Aug. 09, 2011
Filed:
Jun. 04, 2009
Applicants:
Li-quan Tan, Sunnyvale, CA (US);
Wing Kong Low, Sunnyvale, CA (US);
Thai LA, San Jose, CA (US);
Inventors:
Assignee:
Apple Inc., Cupertino, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H05B 41/16 (2006.01); H05B 41/24 (2006.01);
U.S. Cl.
CPC ...
Abstract
Methods and systems for providing stable and accurate low noise DC reference voltage are described. In the described embodiments, a feedback controlled DC reference voltage supply provides a stable and well controlled sense current. The sense current is in turn used to produce a stable and well controlled light output from a light emitting diode (LED).
Tan, Li-Quan. (2011). Pulse width modulation (pwm) closed loop led current driver in an embedded system (U.S. Patent No. 7994730). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/7994730
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile