SMART SCANNING FOR A CAPACITIVE SENSE ARRAY
First Claim
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1. A method, comprising:
- scanning, by a processing device, a plurality of scan groups in a capacitive sense array to generate signals corresponding to a mutual capacitance at sense elements of the capacitive sense array, wherein each of the plurality of scan groups comprises a plurality of sense elements;
identifying a scan group where the generated signal is affected by a presence of a conductive object; and
individually scanning the plurality of sense elements in the identified scan group to determine a location of the conductive object.
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Abstract
A method and apparatus scan a plurality of scan groups in a capacitive sense array to generate signals corresponding to a mutual capacitance between the electrodes. Each of the plurality of scan groups is formed from a subset of the plurality of electrodes. A processing device identifies a scan group where the generated signal is affected by a presence of a conductive object. The processing device individually scans the subset of the plurality of sense elements in the identified scan group to determine a location of the conductive object.
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Citations
20 Claims
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1. A method, comprising:
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scanning, by a processing device, a plurality of scan groups in a capacitive sense array to generate signals corresponding to a mutual capacitance at sense elements of the capacitive sense array, wherein each of the plurality of scan groups comprises a plurality of sense elements; identifying a scan group where the generated signal is affected by a presence of a conductive object; and individually scanning the plurality of sense elements in the identified scan group to determine a location of the conductive object. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus, comprising:
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a capacitive sense array having a plurality of sense elements; and a processing device coupled to the capacitive sense array, the processing device configured to; scan a plurality of scan groups in the capacitive sense array to generate signals corresponding to a mutual capacitance at the sense elements, wherein each of the plurality of scan groups comprises a subset of the plurality of sense elements; identify a scan group where the generated signal is affected by a presence of a conductive object; and individually scan the subset of the plurality of sense elements in the identified scan group to determine a location of the conductive object. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. An apparatus comprising:
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a touch-sensor device, the touch-sensor device comprising an array of capacitive sense elements, the array comprising a plurality of transmit electrodes and a plurality of receive electrodes; a transmit selection circuit coupled to the touch-sensor device, the transmit selection circuit to selectively apply a transmit signal to one or more of the transmit electrodes; a receive selection circuit coupled to the touch-sensor device, the receive selection circuit to selectively measure a signal from one or more of the receive electrodes, wherein the measured signal corresponds to a mutual capacitance value between a transmit electrode and a receive electrode; and a processing device coupled to the touch-sensor device, the processing device configured to; scan a scan group of the capacitive sense array to determine if a conductive object is present on the touch-sensor device in an area corresponding to the scan group, wherein the scan group comprises at least one transmit electrode and a plurality of receive electrodes; and if a conductive object is present on the touch-sensor device in the area corresponding to the scan group, individually scan the plurality of sense elements in the scan group to determine a location of the conductive object. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification