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:
Dec. 31, 2024
Filed:
Aug. 30, 2023
Applicant:
Pixart Imaging Inc., Hsin-Chu County, TW;
Inventors:
Kuan-Choong Shim, Penang, MY;
Gim-Eng Chew, Penang, MY;
Assignee:
PIXART IMAGING INC., Hsin-Chu County, TW;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01D 5/347 (2006.01); G01D 5/244 (2006.01);
U.S. Cl.
CPC ...
G01D 5/34715 (2013.01); G01D 5/24428 (2013.01); G01D 5/24457 (2013.01); G01D 5/24466 (2013.01); G01D 5/24471 (2013.01); G01D 5/24476 (2013.01); G01D 5/3473 (2013.01);
Abstract
There is provided a light control circuit including a light detector, a frequency detector, an error amplifier, an NMOS driver and a light source. The frequency detector identifies a signal frequency according to detected voltage signals outputted by the light detector and generates a control signal accordingly. The NMOS driver changes a drive current of the light source according to an output of the error amplifier. The error amplifier changes a bandwidth thereof according to the control signal from the frequency detector to regulate a response time of the drive current of the light source.