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. 27, 2016
Filed:
Sep. 30, 2014
Apple Inc., Cupertino, CA (US);
Parin Patel, San Francisco, CA (US);
Stephen J. Hrinya, San Jose, CA (US);
Apple Inc., Cupertino, CA (US);
Abstract
An asymmetric multiphase boost that provides flash functionality for display backlights. A backlight power management module for a display backlight may implement and control an asymmetric multiphase boost that includes two boost phases: a primary boost phase for typical display backlighting, and a secondary or flash boost phase that provides flash functionality via the display backlight when needed. The primary boost phase may be sized to provide high low-load efficiency, high inductance, and low switching frequency for normal display backlight operations. The flash boost phase may be sized for high current and peak power, low inductance, and high switching frequency for pulsed current applications. Via the asymmetric multiphase boost, the backlight power management module may, for example, be used to provide a camera flash function for front facing cameras.