Patent ID: 8933901
Filing Date: 2015-01-13
Classification: G06F,G09G,H01Q

Abstract:
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 a sensing area having a plurality of concentrically aligned electrode loops, the loops all being electrically open at a first location, and having a connection to touch sensing circuitry at an opposite second location, each of the electrode loops thereby having two arms of substantially equal length, the induced current in a first arm of each of the plurality of concentrically aligned electrode loops being equal and opposite to the induced current in a second arm of each of the plurality of concentrically aligned electrode loops to thereby result in a reduced induced current in each of the plurality of concentrically aligned electrode loops.