Barrier Electrode Driven By An Excitation Signal
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United States of America Patent
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Issued Date -
Jan 7, 2016
app pub date -
Sep 17, 2015
filing date -
Feb 28, 2014
priority date (Note) -
Abandoned
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Abstract
Apparatuses and method of driving a shield electrode and electrodes of a matrix are described. One apparatus includes a plurality of electrodes disposed as a matrix below a touch surface, a shield electrode, and a capacitance-sensing circuit. The capacitance-sensing circuit measures capacitances of the plurality of electrodes to detect a conductive object in contact with the touch surface or above the touch surface. The capacitance-sensing circuit measures a self-capacitance of a first electrode of the plurality of electrodes while driving the shield electrode with a shield signal, the shield signal being the same electrical potential as the plurality of electrodes. The capacitance-sensing circuit drives a second electrode of the plurality of electrodes as a barrier electrode to increase a detection distance from the touch surface to detect a conductive object above the touch surface.
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