Cancelling induced currents in a touch sensing device having an embedded near field communication antenna

摘要

A method and system for enabling a near field communication antenna to be disposed adjacent to electrodes of a touch sensing device, the near field communication antenna being operated, and the magnetic field inductance and electric field coupling between the electrodes and the near field communication antenna being minimized in order to substantially reduce or eliminate induced currents on the electrodes.

主权项

1. A method for reducing induced current in electrodes of a touch sensing device that is operating adjacent to a near field communication antenna, said method comprising:
1) providing a plurality of electrodes that form a sensing area used in a touch sensing device; 2) providing a near field communication antenna disposed adjacent to the plurality of electrodes; and 3) reducing induced current in the plurality of electrodes caused by operation of the near field communication antenna by configuring the electrodes to reduce the effect of electromagnetic fields generated by the near field communication antenna by arranging the plurality of electrodes to form the sensing area having a series of parallel rows of electrodes extending from a top edge to a bottom edge of the sensing area, each of the plurality of electrodes being electrically separate from each other, each of the plurality of electrodes following a first path that is beginning at a first edge and terminating at an opposite second edge of the sensing area; and 4) increasing a length of at least one of the plurality of electrodes that is affected by the electromagnetic fields by increasing the length beginning from the second edge and extending back towards the first edge along a second path that is parallel to the first path to thereby reduce current that is induced in the at least one of the plurality of electrodes.