Neutralizing electromagnetic noise for a capacitive input device
First Claim
Patent Images
1. A capacitive input device comprising:
- a capacitive position sensor including;
a plurality of first position electrodes extending in generally the same plane and laterally spaced apart from each other; and
a first sensor electrode generally parallel to and spaced from the plurality of position electrodes, the first sensor electrode being capacitively coupled and slidably movable relative to the first position electrodes;
at least one conductive element positioned generally parallel to and spaced from the plurality of first position electrodes on an opposite side of the plurality of first position electrodes relative to the sensor electrode, the at least one conductive element being stationary relative to the first position electrodes; and
a differential signal controller configured to sample a position measurement signal relative to an overlap capacitance at the capacitive position sensor and the at least one conductive element.
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Abstract
A method of capturing user control inputs for an electronic device comprises sampling an input measurement signal at a capacitive input sensor of the electronic device to capture user control inputs for operating the electronic device. Electromagnetic interference affecting the sampling of the input measurement signal is electronically neutralized.
26 Citations
11 Claims
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1. A capacitive input device comprising:
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a capacitive position sensor including; a plurality of first position electrodes extending in generally the same plane and laterally spaced apart from each other; and a first sensor electrode generally parallel to and spaced from the plurality of position electrodes, the first sensor electrode being capacitively coupled and slidably movable relative to the first position electrodes; at least one conductive element positioned generally parallel to and spaced from the plurality of first position electrodes on an opposite side of the plurality of first position electrodes relative to the sensor electrode, the at least one conductive element being stationary relative to the first position electrodes; and a differential signal controller configured to sample a position measurement signal relative to an overlap capacitance at the capacitive position sensor and the at least one conductive element. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A capacitive input system comprising:
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a capacitive position sensor; and a position signal circuit coupled to the capacitive position sensor and configured to periodically sample a position measurement signal at the capacitive position sensor at substantially random intervals; wherein the capacitive position sensor comprises; a plurality of position electrodes extending in generally the same plane and laterally spaced apart from each other; and a sensor electrode generally parallel to and spaced from the plurality of position electrodes, the sensor electrode being capacitively coupled and slidably movable relative to the position electrodes; at least one conductive element generally parallel to and spaced from the plurality of position electrodes, positioned on an opposite side of the plurality of position electrodes relative to the sensor electrode and fixed relative to the position electrodes; and a differential signal controller configured to sample the position measurement signal as an overlap capacitance relative to the capacitive position sensor and relative to the at least one conductive element. - View Dependent Claims (9, 10, 11)
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Specification