Touch Sensing Having Increased Immunity to the Presence of a Fluid Layer
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United States of America Patent
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Issued Date -
Sep 25, 2014
app pub date -
Mar 22, 2013
filing date -
Mar 22, 2013
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
In certain embodiments, a touch sensitive device includes a cover panel, a plurality of drive electrodes positioned below the cover panel, a plurality of sense electrodes positioned below the cover panel, and a controller. The controller includes a signal generator operable to supply a drive signal to a particular drive electrode of the plurality of drive electrodes. The controller further includes measurement circuits associated with each of the plurality of sense electrodes, each measurement circuit being operable to generate a signal corresponding to the charge transfer between the particular drive electrode and a corresponding sense electrode. The drive signal supplied by the signal generator has a frequency that reduces the charge transfer caused by a fluid layer located on the cover panel to an amount falling below a threshold corresponding to the point at which the controller determines that a touch is present.
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