Channel aggregation for optimal stylus detection
First Claim
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1. A stylus detection apparatus for detecting an asynchronous active stylus, the apparatus comprising:
- a plurality of sense channels, each sense channel including an amplifier, wherein the plurality of sense channels are configured to sense signals at a plurality of electrodes of a touch sensor panel, the signals including one or more stylus signals generated by the asynchronous active stylus;
a channel aggregator coupled to receive outputs of the plurality of sense channels and configured to generate one or more aggregated signals based on combinations of the outputs of the plurality of sense channels, wherein the channel aggregator is configured to sum at least two of a plurality of first signals sensed at a plurality of first electrodes of the plurality of electrodes to generate at least one aggregated signal; and
one or more stylus signal detectors, each stylus signal detector configured to;
receive one of the aggregated signals from the channel aggregator;
detect one of the stylus signals based on the received aggregated signal; and
estimate a start time and an end time for the detected stylus signal.
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Abstract
A touch input device configured to detect stylus signals generated by an external stylus is provided. The touch input device includes a plurality of stylus signal detectors that receive at its input a combination of stylus receive channels that are combined in a manner to minimize noise while at the same time keeping the stylus signal strength uniform independent of the position of the stylus on the device.
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Citations
24 Claims
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1. A stylus detection apparatus for detecting an asynchronous active stylus, the apparatus comprising:
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a plurality of sense channels, each sense channel including an amplifier, wherein the plurality of sense channels are configured to sense signals at a plurality of electrodes of a touch sensor panel, the signals including one or more stylus signals generated by the asynchronous active stylus; a channel aggregator coupled to receive outputs of the plurality of sense channels and configured to generate one or more aggregated signals based on combinations of the outputs of the plurality of sense channels, wherein the channel aggregator is configured to sum at least two of a plurality of first signals sensed at a plurality of first electrodes of the plurality of electrodes to generate at least one aggregated signal; and one or more stylus signal detectors, each stylus signal detector configured to; receive one of the aggregated signals from the channel aggregator; detect one of the stylus signals based on the received aggregated signal; and estimate a start time and an end time for the detected stylus signal. - View Dependent Claims (2, 3, 4, 5, 6, 19, 22)
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7. A method for detecting an asynchronous active stylus, the method comprising:
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sensing, by a plurality of sense channels, one or more active stylus signals at a plurality of electrodes of a touch sensor panel, the one or more active stylus signals generated by the asynchronous active stylus, wherein each sense channel includes an amplifier; generating one or more aggregated signals based on combinations of outputs of the plurality of sense channels, wherein generating the one or more aggregated signals includes summing at least two of a plurality of first signals sensed at a plurality of first electrodes of the plurality of electrodes to generate at least one aggregated signal; and at a stylus signal detector; detecting one of the stylus signals based on the received aggregated signal; and estimating a start time and an end time for the detected stylus signal. - View Dependent Claims (8, 9, 10, 11, 12, 20, 23)
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13. A non-transitory computer readable storage medium having stored thereon a set of instructions for detecting an asynchronous active stylus that when executed by a processor causes the processor to:
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sense, by a plurality of sense channels, one or more active stylus signals at a plurality of electrodes of a touch sensor panel, the one or more active stylus signals generated by the asynchronous active stylus, wherein each sense channel includes an amplifier; generate one or more aggregated signals based on combinations of outputs of the plurality of sense channels, wherein generating the one or more aggregated signals includes summing at least two of a plurality of first signals sensed at a plurality of first electrodes of the plurality of electrodes to generate at least one aggregated signal; and at a stylus signal detector; receive one of the aggregated signals; detect one of the stylus signals based on the received aggregated signal; and estimate a start time and an end time for the detected stylus signal. - View Dependent Claims (14, 15, 16, 17, 18, 21, 24)
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Specification