BASELINE RECALCULATION AFTER FREQUENCY RECONFIGURATION OF A MUTUAL CAPACITIVE TOUCH CONTROLLER
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United States of America Patent
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Issued Date -
Aug 13, 2015
app pub date -
Apr 20, 2015
filing date -
Nov 8, 2012
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Systems and methods are provided that allow a touch sensor, such as a mutual capacitive touch panel, to switch from an operative transmit (TX) frequency at which the mutual capacitive touch panel is driven to an alternative TX frequency. When switching to an alternative TX frequency, an alternative baseline capacitance value corresponding to the alternative TX frequency may be utilized to determine whether a touch event has occurred on the mutual capacitive touch panel. Frame scans can be repeatedly performed at the operative TX frequency and the alternative TX frequency in rapid succession, and an average difference of the frame scans can be calculated and utilized to generate the alternative baseline capacitance value which may be insensitive to sudden ambient changes and moving touch events affecting the mutual touch capacitive panel.
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