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US 11,079,878 B1Granted
Noise mitigation touch sensing circuit
AssigneeApple Inc.
InventorChristoph H. Krah
Life of this patent
Estimating the term…
Abstract
Techniques for mitigating noise in a touch signal are disclosed. To reduce or eliminate noise in a touch signal, the touch activity can be filtered out of a touch signal, thus isolating the noise. In some examples, the noise is then provided to the non-inverting input port of a differential amplifier while the unfiltered touch signal is provided to the inverting input port of the differential amplifier. The noise, which is now common on both inputs, is automatically eliminated or reduced by the differential amplifier.
Claims20
A touch controller, comprising:
- sense circuitry configured to sense touch activity from one or more touch electrodes on a touch sensor panel, including:
- a differential amplifier including a first input port coupled to a sense line and a second input port;
- and
- a filter circuit coupled to the sense line, wherein the filter circuit is configured to filter a touch signal from the sense line and output a filtered signal to the second input port of the differential amplifier.
1 more element
A method, comprising:
- receiving, via a sense line, a touch signal associated with touch activity from one or more touch electrodes on a touch sensor panel;
- generating, via a filter, a filtered signal by filtering the touch signal from the sense line;
- and
- amplifying, via a differential amplifier, a difference between the touch signal and the filtered signal.
1 more element
An electronic device comprising:
- a display;
- a touch sensor panel;
- and
- a touch controller coupled to the touch sensor panel, wherein the touch controller includes:
- sense circuitry configured to sense touch activity from one or more touch electrodes on the touch sensor panel, including:
- a differential amplifier including a first input port coupled to a sense line and a second input port;
- and
- a filter circuit coupled to the sense line, wherein the filter circuit is configured to filter a touch signal from the sense line and output a filtered signal to the second input port of the differential amplifier.
5 more elements
Dependencies are inferred from the claim text.