Touch detection techniques for capacitive touch sense systems
First Claim
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1. A method comprising:
- measuring capacitance values of a capacitance sense element;
monitoring a rate of change of the measured capacitance values; and
rejecting an activation of the capacitance sense element as a non-touch event if conditions indicative of the non-touch event are sensed, wherein the conditions indicative of the non-touch event comprise the rate of change of the measured capacitance values having a magnitude greater than a threshold level, wherein the threshold level is indicative of a maximum rate of change of a touch event.
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Abstract
A technique for recognizing and rejecting false activation events related to a capacitance sense interface includes measuring a capacitance value of a capacitance sense element. The measured capacitance value is analyzed to determine a baseline capacitance value for the capacitance sensor. The capacitance sense interface monitors a rate of change of the measured capacitance values and rejects an activation of the capacitance sense element as a non-touch event when the rate of change of the measured capacitance values have a magnitude greater than a threshold level, indicative of a maximum rate of change of a touch event.
387 Citations
19 Claims
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1. A method comprising:
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measuring capacitance values of a capacitance sense element; monitoring a rate of change of the measured capacitance values; and rejecting an activation of the capacitance sense element as a non-touch event if conditions indicative of the non-touch event are sensed, wherein the conditions indicative of the non-touch event comprise the rate of change of the measured capacitance values having a magnitude greater than a threshold level, wherein the threshold level is indicative of a maximum rate of change of a touch event. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method comprising:
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measuring capacitance values of a capacitance sense element; monitoring a rate of change of the measured capacitance values; and distinguishing between an activation of the capacitance sense element by a conductive object and a non-touch event when the rate of change of the measured capacitance values exceeds a magnitude greater than a threshold level, the threshold level indicative of a maximum rate of change of a touch event. - View Dependent Claims (14, 15)
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16. An apparatus comprising:
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a capacitance measurement circuit to be coupled to a capacitance sense element, wherein the capacitance measurement circuit is configured to measure capacitance values of the capacitance sense element; and event logic coupled to the capacitance measurement circuit, the event logic to measure a rate of change of the measured capacitance values and to distinguish between an activation of the capacitance sense element by a conductive object and a non-touch event when the rate of change of the measured capacitance values exceeds a magnitude greater than a threshold level, the threshold level indicative of a maximum rate of change of a touch event. - View Dependent Claims (17, 18, 19)
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Specification