SYSTEM AND METHOD FOR DETERMINING A NUMBER AND POSITION OF ONE OR MORE TOUCHES ON A TOUCH SCREEN
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United States of America Patent
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Issued Date -
Apr 25, 2013
app pub date -
Oct 25, 2011
filing date -
Oct 25, 2011
priority date (Note) -
Abandoned
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Abstract
A method of determining a position and number of touches made on a capacitive touch screen device having capacitive touch sensor elements is provided. The method includes measuring capacitance values for each of the capacitive touch sensor elements, combining the capacitance values of each row of individual capacitive touch sensor to produce a horizontal sum of the capacitance values for each row, and combining the capacitance values of each column of individual capacitive touch sensor to produce a vertical sum of the capacitance values for each column. The method also includes determining a largest value of the horizontal sums and the vertical sums and normalizing the values of the vertical and horizontal sums to the largest vertical and horizontal sum, and applying one or more rules to the normalized horizontal and vertical sums to determine the number of touches made on the capacitive touch screen device.
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