公开(公告)号：US20190059136A1

公开(公告)日：2019-02-21

申请号：US15784943

申请日：2017-10-16

Applicant: Apple Inc.

Inventor： Mohammad J. NAVABI-SHIRAZI ,  Alejandro Lara ASCORRA ,  Asif HUSSAIN ,  Ji Yeoul RYOO ,  Jingdong CHEN ,  Jun QI ,  Manisha P. PANDYA ,  Yanhui XIE

IPC: H05B33/08

Abstract: Aspects of the subject technology relate to control circuitry for light-emitting diodes. The control circuitry may operate a light-emitting diode using a multi-peak pulse-width-modulation signal. The control circuitry may include a multi-stage driver having a relatively larger driver stage for providing a direct current through a light-emitting diode and a relatively smaller driver stage configured to cooperate with a pulse-width-modulation controller to pulse-width-modulate a current through the light-emitting diode.