TOUCH SENSING DEVICE AND METHOD USING RANDOM SPREAD SPECTRUM SIGNAL
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United States of America Patent
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Issued Date -
Feb 24, 2011
app pub date -
Aug 19, 2009
filing date -
Aug 19, 2009
priority date (Note) -
Abandoned
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Abstract
A touch sensing device and method for detecting a touch event of a sensing array are disclosed. In the present invention, a random duration square wave signal is used to modulate a current or voltage signal so as to generate a modulated driving signal for driving a row of the sensing array. The random duration square wave signal has cycles of different durations so that the modulated driving signal also has the same cycles with the different durations. A sensing signal is measured from a column, for example, of the sensing array. Touching information is extracted by using the random duration square wave signal to demodulate the sensing signal.
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