公开(公告)号：US20180059868A1

公开(公告)日：2018-03-01

申请号：US15650770

申请日：2017-07-14

Applicant: Apple Inc.

Inventor： Kingsuk BRAHMA ,  Jie Won RYU ,  Hopil BAE ,  Yafei BI

IPC: G06F3/041 ,  G02F1/1333 ,  G06F3/044

CPC classification number: G06F3/0418 ,  G02F1/13338 ,  G06F3/0412 ,  G06F3/044 ,  G09G3/2022 ,  G09G5/003 ,  G09G2340/0435 ,  G09G2370/08

Abstract: Touch induced flicker for variable refresh rate (VRR) displays can be reduced by adjusting one or more voltages. Synchronization of touch sensing operations after an immediate exit can introduce flicker issues into the VRR display. In some examples, the touched induced flicker can be reduced or eliminated by tuning the voltage on a common electrode (Vcom) to a tuning point that reduces a maximum error below a threshold, irrespective of refresh rate. In some examples, touch induced flicker can be reduced or eliminated by monitoring average Vcom, and when the change in average Vcom exceeds a threshold, Vcom can be adjusted to counteract the change in average Vcom due to the variable refresh rate and/or immediate exit. In some examples, touch induced flicker can be reduced or eliminated by applying a direct current (DC) pedestal to pixel gate lines during touch sensing scans.