Technique for Increasing The Sensitivity of Capacitive Sense Arrays
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Abstract
A technique for operating a capacitive sensor array is described. The technique includes measuring a first capacitance of a first set of electrodes at a first time, measuring a second capacitance of a second set of electrodes at a second time, and calculating a position of a conductive object based on a relative magnitude of the first capacitance and the second capacitance. The first set and the second set includes at least one electrode in common and at least one electrode that is not in common.
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Citations
40 Claims
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1-20. -20. (canceled)
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21. A method comprising:
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measuring a first capacitance of a first plurality of electrodes at a first time; measuring a second capacitance of a second plurality of electrodes at a second time, wherein the first plurality of electrodes and the second plurality of electrodes comprises at least one electrode in common and at least one electrode that is not in common; and calculating a position of a conductive object based on a relative magnitude of the first capacitance and the second capacitance. - View Dependent Claims (22, 24, 25, 26, 27, 28, 29, 30, 31, 32)
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23. The method of claim 23, wherein the electrically coupling the first plurality of electrodes in the first group and electrically coupling the second plurality of electrodes are performed sequentially to a capacitance measurement circuit.
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33. A non-transitory machine-readable medium that stores instructions that when executed by a processing device cause the processing device to:
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measure a first capacitance of a first plurality of electrodes at a first time; measure a second capacitance of a second plurality of electrodes at a second time, wherein the first plurality of electrodes and the second plurality of electrodes comprises at least one electrode in common and at least one electrode that is not in common; and calculate a position of a conductive object based on a relative magnitude of the first capacitance and the second capacitance. - View Dependent Claims (34)
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35. An apparatus comprising:
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a processing device; a user interface device coupled to the processing device, wherein the user interface device comprises a first plurality of electrodes and a second plurality of electrodes, wherein the first plurality of electrodes and the second plurality of electrodes comprises at least one electrode in common and at least one electrode that is not in common, wherein the processing device is configured to; measure a first capacitance of the first plurality of electrodes at a first time; measure a second capacitance of the second plurality of electrodes at a second time; and calculate a position of a conductive object based on a relative magnitude of the first capacitance and the second capacitance. - View Dependent Claims (36, 37, 38, 39, 40)
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Specification