METHOD AND APPARATUS FOR DETECTING TWO SIMULTANEOUS TOUCHES AND GESTURES ON A RESISTIVE TOUCHSCREEN
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United States of America Patent
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Issued Date -
Dec 31, 2009
app pub date -
Jun 30, 2008
filing date -
Jun 30, 2008
priority date (Note) -
Abandoned
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Abstract
Resistive touchscreen system has a substrate with a first conductive coating having a first resistance and a coversheet with a second conductive coating having a second resistance. The substrate and coversheet are positioned proximate each other such that the first conductive coating faces the second conductive coating. The substrate and coversheet are electrically disconnected with respect to each other in the absence of a touch. First and second sets of electrodes for establishing voltage gradients in first and second directions are formed on the substrate and the coversheet, respectively. A controller biases the first and second sets of electrodes in two different cycles. The controller senses a bias current associated with at least one of the first and second resistances. The bias current has a reference value associated with no touch. An increase in the bias current relative to the reference value indicates two simultaneous touches.
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