Touch detection using multiple simultaneous stimulation signals
First Claim
1. An apparatus comprising:
- drive circuitry configured to simultaneously apply, during each of a plurality of frames, a plurality of stimulation signals to a plurality of drive lines of touch sensor circuitry, the plurality of stimulation signals having a stimulation frequency and multiple stimulation phases, wherein the stimulation frequency during at least two of the plurality of frames is different; and
sense circuitry configured, during each of the plurality of frames, to receive a sense signal from each of a plurality of sense lines of the touch sensor circuitry into one or more sense channels and to demodulate the sense signals with one or more demodulation signals, the one or more demodulation signals having a demodulation frequency and multiple demodulation phases based on the stimulation frequency and the multiple stimulation phases being applied during that frame.
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Accused Products
Abstract
The use of multiple stimulation signals having one or more frequencies and one or more phases to generate an image of touch on a touch sensor panel is disclosed. Each of a plurality of sense channels can be coupled to a column in a touch sensor panel and can have one or more mixers. Each mixer in the sense channel can utilize a circuit capable generating a demodulation frequency of a particular frequency. At each of multiple steps, various phases of one or more selected frequencies can be used to simultaneously stimulate the rows of the touch sensor panel, and the one or more mixers in each sense channel can be configured to demodulate the signal received from the column connected to each sense channel using the one or more selected frequencies. After all steps have been completed, the demodulated signals from the one or more mixers can be used in calculations to determine an image of touch for the touch sensor panel at each of the one or more frequencies.
266 Citations
19 Claims
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1. An apparatus comprising:
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drive circuitry configured to simultaneously apply, during each of a plurality of frames, a plurality of stimulation signals to a plurality of drive lines of touch sensor circuitry, the plurality of stimulation signals having a stimulation frequency and multiple stimulation phases, wherein the stimulation frequency during at least two of the plurality of frames is different; and sense circuitry configured, during each of the plurality of frames, to receive a sense signal from each of a plurality of sense lines of the touch sensor circuitry into one or more sense channels and to demodulate the sense signals with one or more demodulation signals, the one or more demodulation signals having a demodulation frequency and multiple demodulation phases based on the stimulation frequency and the multiple stimulation phases being applied during that frame. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method comprising:
during each of a plurality of frames, simultaneously applying a plurality of stimulation signals to a plurality of drive lines of touch sensor circuitry, the plurality of stimulation signals having a stimulation frequency and multiple stimulation phases, wherein the stimulation frequency during at least two of the plurality of frames is different, receiving a sense signal from each of a plurality of sense lines of the touch sensor circuitry into one or more sense channels, and demodulating the sense signals with one or more demodulation signals, the one or more demodulation signals having a demodulation frequency and multiple demodulation phases based on the stimulation frequency and the multiple stimulation phases being applied during that frame. - View Dependent Claims (9, 10, 11, 12)
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13. A non-transitory computer readable storage medium storing instructions, that when executed by a processor, performs a method comprising:
during each of a plurality of frames, simultaneously applying a plurality of stimulation signals to a plurality of drive lines of touch sensor circuitry, the plurality of stimulation signals having a stimulation frequency and multiple stimulation phases, wherein the stimulation frequency during at least two of the plurality of frames is different, receiving a sense signal from each of a plurality of sense lines of the touch sensor circuitry into one or more sense channels, and demodulating the sense signals with one or more demodulation signals, the one or more demodulation signals having a demodulation frequency and multiple demodulation phases based on the stimulation frequency and the multiple stimulation phases being applied during that frame. - View Dependent Claims (14, 15, 16, 17, 18, 19)
Specification