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1. (WO2015047550) MODULATED POWER SUPPLY FOR REDUCED PARASITIC CAPACITANCE

Pub. No.:    WO/2015/047550    International Application No.:    PCT/US2014/050013
Publication Date: Fri Apr 03 01:59:59 CEST 2015 International Filing Date: Thu Aug 07 01:59:59 CEST 2014
IPC: G06F 3/044
G06F 1/26
Applicants: SYNAPTICS INCORPORATED
Inventors: MOREIN, Stephen L.
REYNOLDS, Joseph Kurth
Title: MODULATED POWER SUPPLY FOR REDUCED PARASITIC CAPACITANCE
Abstract:
An input device comprising a display device having an integrated capacitive sensing device. The input device includes a plurality of sensor electrodes a plurality of display electrodes, a modulated power supply configured to provide a modulated reference signal, and a processing system. The processing system includes a sensor module configured to drive a plurality of sensor electrodes with a modulated capacitive sensing signal that is based on the modulated reference signal for capacitive sensing during a first time period. The processing system also includes a display driver module configured to drive a plurality of display electrodes of a display device with modulated signals based on the modulated reference signal during the first time period. The modulated signals cause voltage between the plurality of display electrodes and the plurality of sensor electrodes to remain substantially constant.