Multipoint touch surface controller
First Claim
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1. An application specific integrated circuit (ASCI) connected to a touch sensor panel including a plurality of drive electrodes and a plurality of sense electrodes, the ASCI is programmed to scan the touch sensor panel, each scan of the touch sensor panel comprising:
- stimulating a first drive electrode of the plurality of drive electrodes with a first periodic waveform and consecutively a second periodic waveform, wherein the second periodic waveform has a frequency different from a frequency of the first periodic waveform;
stimulating a second drive electrode of the plurality of drive electrodes with the first periodic waveform and consecutively the second periodic waveform, wherein the second drive electrode is stimulated after the stimulation of the first drive electrode; and
capturing a capacitance measurement from the plurality of sense electrodes in response to each stimulation of the drive electrodes.
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Abstract
A multipoint touch surface controller is disclosed herein. The controller includes an integrated circuit including output circuitry for driving a capacitive multi-touch sensor and input circuitry for reading the sensor. Also disclosed herein are various noise rejection and dynamic range enhancement techniques that permit the controller to be used with various sensors in various conditions without reconfiguring hardware.
256 Citations
14 Claims
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1. An application specific integrated circuit (ASCI) connected to a touch sensor panel including a plurality of drive electrodes and a plurality of sense electrodes, the ASCI is programmed to scan the touch sensor panel, each scan of the touch sensor panel comprising:
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stimulating a first drive electrode of the plurality of drive electrodes with a first periodic waveform and consecutively a second periodic waveform, wherein the second periodic waveform has a frequency different from a frequency of the first periodic waveform; stimulating a second drive electrode of the plurality of drive electrodes with the first periodic waveform and consecutively the second periodic waveform, wherein the second drive electrode is stimulated after the stimulation of the first drive electrode; and capturing a capacitance measurement from the plurality of sense electrodes in response to each stimulation of the drive electrodes. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A computer-implemented method for suppressing noise in a touch sensor panel including a plurality of drive electrodes and a plurality of sense electrodes, the method comprising, in a scan of the touch sensor panel:
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stimulating a first drive electrode of the plurality of drive electrodes with a first periodic waveform and consecutively a second periodic waveform, wherein the second periodic waveform has a frequency different from a frequency of the first periodic waveform; stimulating a second drive electrode of the plurality of drive electrodes with the first periodic waveform and consecutively the second periodic waveform, wherein the second drive electrode is stimulated after the stimulation of the first drive electrode; and capturing a capacitance measurement from the plurality of sense electrodes in response to each stimulation of the drive electrodes. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification