Device and method for detecting touch screen
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United States of America Patent
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Issued Date -
Nov 25, 2010
app pub date -
Jul 13, 2009
filing date -
May 20, 2009
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Techniques for detecting multiple touch points for touch screen are disclosed. A touch screen includes a first conductive layer and a second conductive layer, each conductive layer having a positive terminal and a negative terminal, an operation of detecting multiple points on a touch screen includes: coupling the positive terminal of the second conductive layer to a positive reference voltage, coupling the negative terminal of the second conductive layer to a negative reference voltage, sampling the positive terminal of the first conductive layer to obtain a series of first voltage samples V1(i), sampling the negative terminal of the first conductive layer to obtain a series of second voltage samples V2(i), wherein i is a sampling number; concluding that a motion tendency of two touch points on the touch screen is contraction when absolute values of the differences V1(i)-V2(i) between the first voltage samples and the second voltage samples tend to increase; and concluding that the motion tendency of two touch points on the touch screen is expansion when the absolute values of the differences V1(i)-V2(i) tend to decrease.
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