Capacitive touch sensors
DCFirst 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 nodes 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 nodes, the subsequent touch data sets received from sensing nodes that are located at the location of the touch and from sensing nodes that are located adjacent to the location of the touch.
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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
17 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 nodes 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 nodes, the subsequent touch data sets received from sensing nodes that are located at the location of the touch and from sensing nodes that are located adjacent to the location of the touch. - 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 having a plurality of sensing nodes; a controller operable to; acquire touch data from each of the plurality of sensing nodes 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 nodes; 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 nodes, the second set of touch data received from sensing nodes located at the location of the touch and from sensing nodes adjacent to the location of the touch. - View Dependent Claims (9, 10, 11, 12)
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13. A controller operable to perform operations comprising:
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acquire sets of touch data in a succession of sampling periods from a capacitive sensor array comprising a plurality of sensing nodes such that; a first portion of the sets of touch data include signals from each of the plurality of sensing nodes when the presence of a touch is absent in a preceding sample period; a second portion of the sets of touch data include signals from less than all of the plurality of sensing nodes when the presence of a touch is determined in a preceding sampling period, the signals of the second portion of the sets of touch data received from sensing nodes located at the touch location determined in the preceding sampling period and received from sensing nodes located adjacent to the touch location determined in the preceding sampling period; and detect presence and location of a touch from one or more of the sets of touch data. - View Dependent Claims (14, 15, 16, 17)
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Specification