- Patent Title: Touch induced flicker mitigation for variable refresh rate display
-
Application No.: US15650770Application Date: 2017-07-14
-
Publication No.: US10359885B2Publication Date: 2019-07-23
- Inventor: Kingsuk Brahma , Jie Won Ryu , Hopil Bae , Yafei Bi
- Applicant: Apple Inc.
- Applicant Address: US CA Cupertino
- Assignee: Apple Inc.
- Current Assignee: Apple Inc.
- Current Assignee Address: US CA Cupertino
- Agency: Kubota & Basol LLP
- Main IPC: G06F3/041
- IPC: G06F3/041 ; G09G3/20 ; G06F3/044 ; G02F1/1333

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.
Public/Granted literature
- US20180059868A1 TOUCH INDUCED FLICKER MITIGATION FOR VARIABLE REFRESH RATE DISPLAY Public/Granted day:2018-03-01
Information query