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US 8,982,097 B1Granted
Water rejection and wet finger tracking algorithms for truetouch panels and self capacitance touch sensors
AssigneeCypress Semiconductor Corporation
InventorsTaras Kuzo, Victor Kremin
Life of this patent
Estimating the term…
Abstract
A method, apparatus, and system to detect a self-capacitance activation in view of a self-capacitance measurement of a first electrode. The method, apparatus, and system further to detect a mutual capacitance activation in view of a mutual capacitance measurement of a pair of electrodes, and to determine the presence of water proximate to the capacitive button when the self-capacitance activation is false and the mutual capacitance activation is true. The capacitive button is disposed on a substrate.
Claims20
A method comprising:
- measuring a first self capacitance on a first electrode;
- measuring a mutual capacitance between a pair of electrodes;
- detecting a first activation of the touch-sensor corresponding to the first electrode and the pair of electrodes when the measured first self capacitance is greater than a first threshold;
- detecting no activation of the touch-sensor when the measured first self capacitance is less than the first threshold and the measured mutual capacitance is greater than a second threshold;
- and
- reporting the first activation or the no activation of the touch-sensor based on the detection of activation or no activation.
3 more elements
A touch screen device comprising:
- a first plurality of electrodes disposed substantially along a first axis;
- a second plurality of electrodes disposed substantially along a second axis, the second axis perpendicular to the first axis, wherein the first and second plurality of electrodes form at least one intersection;
- a controller coupled to the first and second pluralities of electrodes and configured to:
- measure a first self capacitance on a first electrode of the first plurality of electrodes;
- measure a mutual capacitance between a second electrode of the second plurality of electrodes and at least one electrode of the first plurality of electrodes;
- detect a first activation of a touch screen device, the first activation corresponding to the first electrode of the when the measured first self capacitance of the first electrode is greater than a first threshold;
- detect no activation of the touch screen when the measured first self capacitance is less than the first threshold and the measured mutual capacitance is greater than a second threshold;
- and
- report the first activation or the no activation of the touch screen device based on the detection of activation or no activation.
6 more elements
A touch screen controller configured to:
- measure a first self capacitance on a first electrode coupled to the touch screen controller;
- measure a mutual capacitance between a pair of electrodes coupled to the touch screen controller;
- detect a first activation of a touch screen, the first activation corresponding to the first electrode and the pair of electrodes when the measured first self capacitance is greater than a first threshold;
- detect no activation of the touch screen when the measured first self capacitance is less than the first threshold and the measured mutual capacitance is greater than a second threshold;
- and
- report the first activation or the no activation of the touch screen based on the detection of activation or no activation.
3 more elements
Dependencies are inferred from the claim text.