Switched-electrode capacitive-measurement device for touch-sensitive and contactless interfaces
First Claim
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1. A measurement device, comprising:
- a plurality of capacitive measurement electrodes;
a plurality of electrode switches coupled to the plurality of capacitive measurement electrodes;
an excitation source for generating a guard potential; and
one or more capacitive detection circuits for receiving the guard potential and generating a first AC potential referenced to the guard potential;
wherein the plurality of electrode switches are configurable to enable a first set of one or more of the capacitive measurement electrodes to be selectively coupled to the one or more capacitive detection circuits and coupled for receiving the first AC potential, and to simultaneously enable a second set of one or more of the capacitance measurement electrodes to be selectively coupled for receiving the guard potential, the guard potential different from an earth potential.
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Abstract
The present invention relates to a capacitive-measurement device for touch-sensitive and/or contactless interfaces, including at least one capacitive-measurement electrode (1) and electrode-switching means (2) capable of electrically connecting said at least one electrode (1), either to capacitive-measurement means or to a guard potential (11), said at least one capacitive-measurement electrode (1) and said electrode-switching means (2) being provided on a single detection surface (7) according to a technique for manufacturing planar electronic components. The invention also relates to an apparatus implementing the device.
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Citations
18 Claims
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1. A measurement device, comprising:
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a plurality of capacitive measurement electrodes; a plurality of electrode switches coupled to the plurality of capacitive measurement electrodes; an excitation source for generating a guard potential; and one or more capacitive detection circuits for receiving the guard potential and generating a first AC potential referenced to the guard potential; wherein the plurality of electrode switches are configurable to enable a first set of one or more of the capacitive measurement electrodes to be selectively coupled to the one or more capacitive detection circuits and coupled for receiving the first AC potential, and to simultaneously enable a second set of one or more of the capacitance measurement electrodes to be selectively coupled for receiving the guard potential, the guard potential different from an earth potential. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for capacitive touch or proximity measurement, comprising:
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generating a guard potential; generating a first AC potential from the guard potential, the first AC potential referenced to the guard potential; selectively coupling a first set of one or more capacitive measurement electrodes for receiving the first AC potential and to one or more capacitive detection circuits for touch or proximity measurement; and simultaneously coupling a second set of one or more of the capacitance measurement electrodes for receiving the guard potential to minimize stray capacitance, the guard potential different from an earth potential. - View Dependent Claims (12, 13, 14, 15, 16)
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17. A method for capacitive touch or proximity measurement, comprising:
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generating a guard potential; generating a first AC potential from the guard potential, the first AC potential referenced to the guard potential; obtaining capacitive touch or proximity measurements from a first set of one or more capacitive measurement electrodes in an array of capacitive measurement electrodes, the first sent of one or more capacitive measurement electrodes receiving the first AC potential; simultaneous with the obtaining of the capacitive touch or proximity measurements from the first set of one or more capacitive measurement electrodes, coupling other capacitive measurement electrodes in the array of capacitance measurement electrodes to the guard potential to minimize stray capacitance, the guard potential different from an earth potential. - View Dependent Claims (18)
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Specification