Touch Screen Detecting Method and Apparatus
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United States of America Patent
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Issued Date -
Dec 2, 2010
app pub date -
May 25, 2010
filing date -
May 27, 2009
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Techniques for detecting one or more touches on a touch screen are disclosed. According to one aspect of the present invention, at least three predetermined points are provided, where each of the at least three predetermined points has a wave receptor mounted thereat. When a touch to the touch screen happens, acoustic wave signals generated at the touch point are received by the wave receptors. The distances between the touch point and the three predetermined points are calculated according to the acoustic wave signals. At least three equations of circles are constructed to respectively employ the three predetermined points as their centers, the distances between the touch point and the at least three predetermined points as their radiuses. The coordinates of the touch point according to a common solution of the at least three equations are then determined. The same approach can be similarly applied to determining multiple touches on a touch screen.
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