DRIVING SCANNED CHANNEL AND NON-SCANNED CHANNELS OF A TOUCH SENSOR WITH SAME AMPLITUDE AND SAME PHASE
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United States of America Patent
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Issued Date -
Mar 18, 2010
app pub date -
Sep 12, 2008
filing date -
Sep 12, 2008
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
The scanned channel and the non-scanned channels of a capacitive touch sensor are driven by a scan signal and a shield signal, respectively, with the shield signal having a substantially same amplitude and a substantially same phase as the amplitude and the phase, respectively, of the scan signal. Thus, the potentials at both the routing line of the scanned channel and the routing line of the non-scanned channels follow each other and are maintained substantially same regardless of which channel is the scanned one. As a result, the parasitic capacitance arising between the two routing lines is reduced significantly, and the accuracy and the sensitivity of the touch sensor are significantly enhanced.
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