Scan sequence generator
First Claim
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1. A sensor panel device comprising:
- an event sensitive panel having at least one sense node that provides an output signal indicative of an event or no-event condition on the panel;
output circuitry operatively connected to the at least one sense node that generates stimulus signals having multiple different frequencies, the sensing node providing multiple outputs in response to the multiple different frequencies for at least one event to detect a position of touching of the sensor panel or nearly touching the sensor panel; and
input circuitry operatively connected to the at least one sense node to receive the multiple outputs, the input circuitry configured to measure the results of any stimulus signals applied to the at least one sense node to determine a position of touch or near touch based on all or a plurality of the received multiple outputs;
wherein the input circuitry comprise a virtual ground charge amplifier.
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Abstract
A sensor panel device that can generate and use a stimulus signal having multiple different waveforms for detecting events on or near the sensor panel is disclosed. Among other things, such a stimulus signal can be used to reject environmental noise present in the device. In some embodiments, the stimulus signal has multiple waveforms having different frequencies. Logic circuitry can generate representative values from output of the different waveforms applied to one or more sensing nodes in the sensor panel device. From the representative values, a final value can be generated that represents whether an event occurred at or near the one or more sensing nodes.
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Citations
31 Claims
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1. A sensor panel device comprising:
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an event sensitive panel having at least one sense node that provides an output signal indicative of an event or no-event condition on the panel; output circuitry operatively connected to the at least one sense node that generates stimulus signals having multiple different frequencies, the sensing node providing multiple outputs in response to the multiple different frequencies for at least one event to detect a position of touching of the sensor panel or nearly touching the sensor panel; and input circuitry operatively connected to the at least one sense node to receive the multiple outputs, the input circuitry configured to measure the results of any stimulus signals applied to the at least one sense node to determine a position of touch or near touch based on all or a plurality of the received multiple outputs; wherein the input circuitry comprise a virtual ground charge amplifier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An apparatus for detecting events on a sensor panel device having a sensor panel surface, the sensor panel device having a plurality of drive electrodes and a plurality of sense electrodes and capacitive sensing nodes at the intersection of the drive and sense electrodes, each capacitive sensing node formed by the intersection of a single drive line and a single sense line, the apparatus comprising:
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a plurality of sensors configured to detect one or more events each sensor comprising a capacitive sensing node; output circuitry operatively connected to the channel scan logic and the plurality of sensors, the output circuitry configured to generate stimulus signals having predetermined waveforms, at least some of the predetermined waveforms having different frequencies, each sensor providing a plurality of different outputs corresponding to the different frequencies to detect the events; and one or more analog channels operatively connected to the plurality of sensors, the one or more analog channels having at least on virtual ground charge amplifier, and the one or more analog channels configured to generate distinct values representative of events occurring at distinct locations each distinct value based on the plurality of different outputs for each sensor. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 28)
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24. A method of detecting events with a touch sensor panel device comprising:
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applying a first stimulation signal having multiple different frequencies to a first touch sensing node of the touch sensor panel device to detect a position of an object touching the touch sensor panel device at or near the first touch sensing node; while applying the first stimulation signal, using a virtual ground charge amplifier for sensing an output of the first touch sensing node for each frequency of the stimulation signal that was applied to the first touch sensing node to thereby provide multiple outputs; offset compensating the multiple outputs, determining a final result based on all or a plurality of the offset compensated multiple outputs of the first touch sensing node; and utilizing the final result to determine the position of touch, near touch or hover location on the touch sensor panel device. - View Dependent Claims (25, 26, 27, 29, 30, 31)
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Specification