Water rejection and wet finger tracking algorithms for truetouch panels and self capacitance touch sensors
First Claim
Patent Images
1. 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.
5 Assignments
0 Petitions
Accused Products
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.
-
Citations
20 Claims
-
1. 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. 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. - View Dependent Claims (10, 11, 12, 13)
-
-
14. 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. - View Dependent Claims (15, 16, 17, 18, 19, 20)
-
Specification