Edge-effect mitigation for capacitive sensors

摘要

An input device for capacitive sensing includes: a plurality of sensor electrodes, the plurality of sensor electrodes comprising a plurality of transmitter electrodes and a plurality of receiver electrodes, wherein the plurality of transmitter electrodes is configured to be driven by sensing signals and the plurality of receiver electrodes is configured to receive detected signals corresponding to respective sensing signals driven onto the plurality of transmitter electrodes; a plurality of transmitter electrode vias, wherein each transmitter electrode via corresponds to a respective transmitter electrode of the plurality of transmitter electrodes; and conductive shielding, configured to mitigate effects of the plurality of transmitter electrode vias on the detected signals received on one or more receiver electrodes of the plurality of receiver electrodes, wherein the conductive shielding comprises: a first portion disposed above the plurality of transmitter electrode vias; and a second portion disposed outside the plurality of transmitter electrode vias.