Excitation schemes for an input device
AssigneeSynaptics Incorporated
InventorsDavid Hoch, Guozhong Shen
Life of this patent
Estimating the term…
Abstract
A system and method for capacitive sensing comprises driving a first sensor electrode of a plurality of sensor electrodes with a first sensing signal to acquire a first resulting signal with the first sensor electrode during a period and driving a second sensor electrode of the plurality of sensor electrodes with the first sensing signal to acquire a second resulting signal with the second sensor electrode during the period. Further, a third sensor electrode of the plurality of sensor electrodes is driven with a reference signal during the period. Rotational information for an input object is determined at least partially based on the first resulting signal and the second resulting signal.
Claims20
An input device, comprising:
- a plurality of sensor electrodes;
- and
- a processing system coupled to the plurality of sensor electrodes and configured to:
- drive first and second sensor electrodes of the plurality of sensor electrodes with first signals to acquire resulting signals via the first and second sensor electrodes during a period, wherein the first signals are sensing signals;
- drive a third sensor electrode of the plurality of sensor electrodes with a reference signal during the period or ground the third sensor electrode of the plurality of sensor electrodes during the period;
- electrically float fourth and fifth sensor electrodes of the plurality of sensor electrodes during the period, wherein the fourth sensor electrode is disposed adjacent to the first sensor electrode, and the fifth sensor electrode is disposed adjacent to the second sensor electrode;
- and
- determine rotational information for an input object at least partially based on the resulting signals.
An input device, comprising:
- a plurality of sensor electrodes;
- and
- a processing system coupled to the plurality of sensor electrodes and configured to:
- drive first and second sensor electrodes of the plurality of sensor electrodes with first signals to acquire resulting signals via the first and second sensor electrodes during a period, wherein the first signals are sensing signals;
- drive a third sensor electrode of the plurality of sensor electrodes with a reference signal during the period or ground the third sensor electrode of the plurality of sensor electrodes during the period;
- drive fourth and fifth sensor electrodes of the plurality of sensor electrodes with second signals during the period, wherein the fourth sensor electrode is disposed adjacent to the first sensor electrode, and the fifth sensor electrode is disposed adjacent to the second sensor electrode;
- and
- determine rotational information for an input object at least partially based on the resulting signals.
A processing system, comprising:
- sensor circuitry coupled to a plurality of sensor electrodes, wherein the sensor circuitry is configured to:
- drive first and second sensor electrodes of the plurality of sensor electrodes with first signals to acquire resulting signals via the first and second sensor electrodes during a period, wherein the first signals are sensing signals;
- drive a third sensor electrode of the plurality of sensor electrodes with a reference signal during the period or ground the third sensor electrode of the plurality of sensor electrodes during the period;
- and
- electrically float fourth and fifth sensor electrodes of the plurality of sensor electrodes during the period or drive fourth and fifth sensor electrodes of the plurality of sensor electrodes with second signals during the period, wherein the fourth sensor electrode is disposed adjacent to the first sensor electrode, and the fifth sensor electrode is disposed adjacent to the second sensor electrode;
- and
- a processor configured to determine rotational information for an input object at least partially based on the resulting signals.
Dependencies are inferred from the claim text.