US Patent 9927926 Capacitance sensing circuits, methods and systems having ground insertion electrodes

A capacitance sensing system can include a plurality of transmit (TX) electrodes disposed in a first direction; a plurality of first electrodes disposed in a second direction and coupled to the TX electrodes by a mutual capacitance, and coupled to a capacitance sense circuit when at least one TX electrode receives a transmit signal; and a plurality of second electrodes structures, interspersed with the first electrodes and coupled to a ground node at least while the one TX electrode receives the transmit signal.