Touch pad and method for detecting multi-touch using the same
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United States of America Patent
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Oct 14, 2014
Grant Date -
Sep 26, 2013
app pub date -
Mar 23, 2012
filing date -
Mar 23, 2012
priority date (Note) -
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Abstract
A touch pad for detecting multi-touch includes a lower pad layer and an upper pad layer being formed of ITO, the upper pad layer overlying the lower pad layer. The lower pad layer includes a plurality of lower pads arranged in a first matrix shape, each of lower pads sensing capacitances caused by the multi-touch. The upper pad layer includes a plurality of upper pads arranged in a second matrix shape. The upper pads are sequentially controlled to put into high-impedance (open circuit) state so that the capacitances can be obtained by the respective set of lower pads corresponding to the upper pad which has been put into the impedance state.
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