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1. (WO2018057319) NOISE MITIGATION FOR DISPLAY PANEL SENSING

Pub. No.:    WO/2018/057319    International Application No.:    PCT/US2017/050769
Publication Date: Fri Mar 30 01:59:59 CEST 2018 International Filing Date: Sat Sep 09 01:59:59 CEST 2017
IPC: G09G 3/20
Applicants: APPLE INC.
Inventors: LIN, Hung Sheng
GAO, Shengkui
NHO, Hyunwoo
LIN, Chin-Wei
VAHID FAR, Mohammad
RYU, Jie Won
BRAHMA, Kingsuk
TAN, Junhua
CHANG, Sun-II
ONO, Shinya
RICHMOND, Jesse A.
BI, Yafei
SHAEFFER, Derek K.
Title: NOISE MITIGATION FOR DISPLAY PANEL SENSING
Abstract:
Systems and methods are provided for differential sensing (DS), difference - differential sensing (DDS), correlated double sampling (CDS), and/or programmable capacitor matching to reduce display panel sensing noise. An electronic device may include one or more processors and an electronic display. The one or more processors may generate image data and adjust the image data based at least in part on display sensing feedback. The electronic display may employ sensing circuitry that obtains the display sensing feedback at least in part by applying test data to a pixel of a column of an active area of the display and differentially senses an electrical value of the pixel in comparison to a reference signal from a different column. This reference signal may provide a common mode noise reference, which is removed by the differential sensing and thereby enhances a quality of the sensed electrical value of the pixel.