Synaptics Incorporated
Input device having reduced electromagnetic interference

Abstract:

An input device comprises a plurality of data lines of a display panel, a plurality of sensor electrodes, and a processing system. The processing system drives a sensor electrode with a sensing signal during a first portion of a non-display update period of a display frame. In certain embodiments, a source driver of the processing system drives a data line with a first constant voltage during at least one of a second portion of the non-display update period and a third portion of the non-display update period. In certain embodiments, the source driver outputs a guard signal during the first portion of the non-display update period. The first portion of the non-display update period occurs after the second portion of the non-display update period and before the third portion of the non-display update period.