Active stylus
First Claim
Patent Images
1. Capacitive sensor circuitry, comprising:
- one or more sense channels coupled to a plurality of sense lines, the one or more sense channels configured for detecting a change in capacitance between an active stylus generating a stimulation signal and the one or more sense lines to determine a location of the active stylus proximate to the one or more sense lines;
wherein the one or more sense channels comprise;
a sense amplifier to adjust a detected change in capacitive coupling;
a clock to generate a demodulation signal;
a phase shifter to shift a phase of the demodulation signal; and
a set of mixers to receive the detected change in capacitive coupling and either the demodulation signal or the phase-shifted demodulation signal to demodulate the sensed voltage.
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Abstract
An active stylus is disclosed. The stylus includes an electrode at a tip of the stylus; and powered circuitry coupled to the electrode and configured for capacitively coupling the electrode with a capacitive touch sensor panel. The powered circuitry can further include drive circuitry configured to output a drive voltage at the electrode and/or sense circuitry configured to sense a voltage received at the electrode.
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Citations
20 Claims
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1. Capacitive sensor circuitry, comprising:
- one or more sense channels coupled to a plurality of sense lines, the one or more sense channels configured for detecting a change in capacitance between an active stylus generating a stimulation signal and the one or more sense lines to determine a location of the active stylus proximate to the one or more sense lines;
wherein the one or more sense channels comprise; a sense amplifier to adjust a detected change in capacitive coupling; a clock to generate a demodulation signal; a phase shifter to shift a phase of the demodulation signal; and a set of mixers to receive the detected change in capacitive coupling and either the demodulation signal or the phase-shifted demodulation signal to demodulate the sensed voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
- one or more sense channels coupled to a plurality of sense lines, the one or more sense channels configured for detecting a change in capacitance between an active stylus generating a stimulation signal and the one or more sense lines to determine a location of the active stylus proximate to the one or more sense lines;
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15. An active stylus, comprising:
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an electrode at a tip of the stylus; powered circuitry coupled to the electrode and configured for capacitively coupling the electrode with a capacitive sensor panel, wherein the powered circuitry comprises sense circuitry configured to sense a voltage received at the electrode, the sense circuitry further comprising; an amplifier to adjust the sensed voltage; a clock to generate a demodulation signal; a phase shifter to shift the phase of the demodulation signal; and a set of mixers to receive the sensed voltage and either the demodulation signal or the phase-shifted demodulation signal to demodulate the sensed voltage. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification