TWO-DIMENSIONAL ABSOLUTE CAPACITANCE SENSING USING ELECTRODE GUARDING TECHNIQUES

摘要

Embodiments described herein include an input device, processing system, and method of performing capacitive sensing using an input device comprising a first plurality of sensor electrodes, a second plurality of sensor electrodes, and a plurality of display electrodes. The method comprises, during a first period, driving the first plurality of sensor electrodes with a first absolute capacitive sensing signal to receive first resulting signals, and driving the second plurality of sensor electrodes and the plurality of display electrodes with a first guarding signal. Each of the first plurality of sensor electrodes comprises at least one common electrode of a display, and wherein each common electrode is configured to be driven for display updating and for capacitive sensing.