Capacitive touch sensors
First Claim
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1. A method comprising:
- acquiring, in a first sampling period, a touch data set with signals from all of a plurality of sensing electrodes in a capacitive sensor array;
determining presence and location of a touch on the capacitive sensor array from the touch data set; and
acquiring, in sampling periods after the first sampling period and while continuing to detect presence of the touch, subsequent touch data sets from less than all of the plurality of sensing electrodes.
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Abstract
A touch data set is acquired via signals from each sensing node in a capacitive sensor array having a plurality of sensing nodes. Touch presence and location on the capacitive sensor array is determined from the touch data set. In subsequent sampling periods while presence of a touch continues to be detected, touch data sets may be acquired from respective subsets of the sensing nodes, each subset being located at and adjacent to the touch location determined in the preceding sampling period.
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Citations
20 Claims
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1. A method comprising:
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acquiring, in a first sampling period, a touch data set with signals from all of a plurality of sensing electrodes in a capacitive sensor array; determining presence and location of a touch on the capacitive sensor array from the touch data set; and acquiring, in sampling periods after the first sampling period and while continuing to detect presence of the touch, subsequent touch data sets from less than all of the plurality of sensing electrodes. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A capacitive sensor device, comprising:
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a capacitive sensor array comprising a plurality of sensing electrodes; a controller operable to; acquire touch data from each of the plurality of sensing electrodes in a first sampling period; detect presence and location of a touch from the touch data; acquire, after the first sampling period and after determining an absence of the touch, a first set of touch data in a second sampling period, the first set of touch data including signals from each of the plurality of sensing electrodes; and acquire, in a third sampling period occurring after the first sampling period and while continuing to detect the touch, a second set of touch data from less than all of the plurality of sensing electrodes. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A system comprising:
a controller configured to; acquire touch data from each of the plurality of sensing electrodes in a first sampling period; detect presence and location of a touch from the touch data; acquire, after the first sampling period and after determining an absence of the touch, a first set of touch data in a second sampling period, the first set of touch data including signals from each of the plurality of sensing electrodes; and acquire, in a third sampling period occurring after the first sampling period and while continuing to detect the touch, a second set of touch data from less than all of the plurality of sensing electrodes. - View Dependent Claims (16, 17, 18, 19, 20)
Specification