STYLUS DETECTION AND DEMODULATION
First Claim
1. A method of detecting stylus signals generated by an external stylus on a touch input device, the method comprising:
- configuring the touch input device to receive a stylus signal;
receiving the stylus signal at a plurality of stylus signal detectors;
determining which of the plurality of stylus signal detectors has a greatest likelihood of having received the stylus signal; and
demodulating the received stylus signal based on one or more metrics generated by the determined stylus signal detector.
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Accused Products
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 can receive the stylus signal and estimate the start and end time of the stylus signal in order to facilitate windowed demodulation of signal. The touch input device also includes circuitry to determine which of the plurality of detectors is most likely to have received the stylus signal and based on that determination can demodulate the signal and extract data embedded within the stylus signal.
27 Citations
24 Claims
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1. A method of detecting stylus signals generated by an external stylus on a touch input device, the method comprising:
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configuring the touch input device to receive a stylus signal; receiving the stylus signal at a plurality of stylus signal detectors; determining which of the plurality of stylus signal detectors has a greatest likelihood of having received the stylus signal; and demodulating the received stylus signal based on one or more metrics generated by the determined stylus signal detector. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An apparatus for detecting stylus signals generated by an external stylus on a touch input device, the apparatus comprising:
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a plurality of electrodes capable of operating as touch hardware during a touch operation mode and operating as stylus detection hardware during a stylus detection mode; a plurality of stylus signal detectors coupled to the plurality of electrodes during a stylus detection mode, each stylus detector capable of receiving a stylus signal and generating one or more metrics pertaining to the detected stylus signal; an arbiter capable of determining which of the plurality of stylus signal detectors has the greatest likelihood of having received the stylus signal; and a demodulator configured to demodulate the stylus signal based on the one or more metrics generated by the stylus detector determined to have the greatest likelihood of having received the stylus signal. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. A non-transitory computer readable storage medium having stored thereon a set of instructions for detecting a demodulating a stylus signal generated by an external stylus, that when executed by a processor causes the processor to:
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configure the touch input device to receive a stylus signal; receive the stylus signal on the touch sensor panel; determine which of the plurality of detectors has the greatest likelihood of having received the stylus signal; and demodulate the received stylus signal based on one or more metrics generated by the stylus detector determined to have the greatest likelihood of having received the stylus signal. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24)
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Specification