USING A PRINTED CIRCUIT TO OFFSET CHARGE DURING CAPACITIVE SENSING

摘要

In a method of capacitive sensing an absolute capacitive sensing signal is driven through at least one of a plurality of routing traces of a printed circuit. Absolute capacitive sensing is performed with at least one sensor electrode of a plurality of sensor electrodes in a sensor electrode pattern. The at least one sensor electrode is coupled with the at least one of the plurality of routing traces. An offsetting signal is transmitted on a parallel conductor overlapping the at least one of the plurality of routing traces, such that charge is offset from the at least one of the plurality of routing traces during the absolute capacitive sensing.

主权项

1. A method of capacitive sensing, said method comprising:
driving an absolute capacitive sensing signal through at least one of a plurality of routing traces of a printed circuit; performing absolute capacitive sensing with at least one sensor electrode of a plurality of sensor electrodes in a sensor electrode pattern, wherein said at least one sensor electrode is coupled with said at least one of said plurality of routing traces; and transmitting an offsetting signal on a parallel conductor overlapping said at least one of said plurality of routing traces, such that charge is offset from said at least one of said plurality of routing traces during said absolute capacitive sensing.