CAPACITIVE TOUCH BUTTON WITH GUARD
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United States of America Patent
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Sep 22, 2017
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May 15, 2012
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Abstract
An apparatus such as a set-top box, includes at least one capacitive touch button with a guard feature that provides, the ability to detect and reject false touches. According to an exemplary embodiment, the apparatus includes a first conductive element that is capacitively isolated from ground, and a second conductive element that is capacitively isolated from ground and located adjacent to the first conductive element. A first sensor is coupled to the first conductive element and measures a change in capacitance between the first conductive element and ground due to a change in physical environment. A second sensor is coupled to the second conductive element and measures a change in capacitance between the second conductive element and ground due to the change in physical environment. A controller is coupled to the first sensor and the second sensor and determines a difference between the measured changes in capacitance.
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