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:
Sep. 23, 2025
Filed:
Jan. 30, 2023
Apple Inc., Cupertino, CA (US);
Thomas C. Greening, San Jose, CA (US);
Apple Inc., Cupertino, CA (US);
Abstract
Configurations for a light source unit and driver circuit and methods thereof are disclosed. The light source unit may include the driver circuit, a power source, a light source, an optical splitter, and a controller. The driver circuit may include an anti-logarithmic pulse width modulated circuit that provides a signal to a switching converter. In some embodiments, the anti-logarithmic pulse width modulated circuit includes a digital-to-analog converter, among other components. The switching converter supplies a drive current to the light source. Because the anti-logarithmic pulse width modulated circuit generates a voltage with a duty cycle that logarithmically varies as the input signal changes, the switching converter may directly drive the light source.