公开(公告)号：US20220061135A1

公开(公告)日：2022-02-24

申请号：US17238851

申请日：2021-04-23

Applicant: Apple Inc.

Inventor： Ming Gu ,  Yanhui Xie ,  Jingdong Chen ,  Asif Hussain ,  Behzad Mohtashemi ,  Mohammad Jafar Navabi-Shirazi ,  Linda A. Kamas ,  Alejandro Lara Ascorra

IPC: H05B45/14 ,  H05B45/325 ,  G09G3/34

Abstract: Aspects of the subject technology relate to electronic devices having a display. The display includes a channel of light emitting diodes (LEDs) having controllable brightness levels and control circuitry coupled to the channel of LEDs. The control circuitry provides a pulse width modulated (PWM) signal having a duty cycle to control the brightness levels. An adaptive headroom control circuitry is configured to sense a headroom voltage signal for the channel of LEDs and apply a first time period for blanking the headroom voltage signal during the first time period that is associated with a settling time for the headroom voltage signal.