Touch Sensing Device and Touch Point Locating Method Thereof
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United States of America Patent
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app pub date -
Mar 23, 2016
filing date -
Aug 31, 2012
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Abstract
A touch sensing device includes first dimensional transparent electrodes and second dimensional transparent electrodes for forming a plurality of touch sensing points; signal generators for generating at least two orthogonal signals simultaneously coupled to at least two of the first dimensional transparent electrodes; analog to digital converters for receiving a plurality of sensing signals from the second dimensional transparent electrodes; and calculating units, for converting the plurality of sensing signals, to determine components of the at least two orthogonal signals in the plurality of sensing signals and locate at least one touch point on the plurality of touch sensing points, wherein the at least two orthogonal signals are at least two sinusoidal signals having respective frequencies that are not integer times of each other, or at least two periodic signals with a same frequency and a phase difference of 90 degree.
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