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US 12,663,887 B2Granted
Stylus to host synchronization using a magnetic field
AssigneeWacom Co., Ltd.
InventorsViktor Kremin, Andriy Ryshtun
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Abstract
A system and method for synchronizing a stylus to a capacitive sense array. The system including a capacitive sense array which includes a plurality of electrodes. A magnetic field is generated using the plurality of electrodes. The magnetic field is used to synchronize the operation of the stylus and the capacitive sense array.
Claims20
An apparatus comprising:
- a capacitive sense array comprising a plurality of electrodes, wherein
- in a first mode for detecting touch objects, the plurality of electrodes are configured to operate as TX and RX electrodes of a mutual capacitive sense array;
- and
- in a second mode for detecting a stylus,
- each of the TX electrodes of the plurality of electrodes is supplied with a TX driver electrical current at one end, while an opposite end is coupled to a voltage potential configured to allow current to flow through the TX electrode, such that the TX driver electrical current passing through the TX electrode from the one end to the opposite end generates a magnetic field that interacts with the stylus, and
- the plurality of electrodes are configured to operate as RX electrodes to detect the stylus,
- wherein each of the TX electrodes extends from the one end to the opposite end across the capacitive sense array such that the one end and the opposite end are located on opposite sides of the capacitive sense array.
4 more elements
A method comprising:
- providing a plurality of electrodes in a capacitive sense array;
- in a first mode for detecting touch objects, operating the plurality of electrodes as TX and RX electrodes of a mutual capacitive sense array;
- and
- in a second mode for detecting a stylus,
- passing a TX driver electrical current from one end to an opposite end of each of the TX electrodes of the plurality of electrodes to generate a magnetic field that interacts with the stylus, and
- using the plurality of electrodes as RX electrodes to detect the stylus,
- wherein each of the TX electrodes extends from the one end to the opposite end across the capacitive sense array such that the one end and the opposite end are located on opposite sides of the capacitive sense array.
4 more elements
A stylus comprising:
- a sensor configured to detect a magnetic field generated by each of TX electrodes of a plurality of electrodes of a capacitive sense array operating in a second mode in which the TX electrode is supplied with a TX driver electrical current at one end, while an opposite end is coupled to a voltage potential configured to allow current to flow through the TX electrode, such that the TX driver electrical current passing through the TX electrode from the one end to the opposite end generates the magnetic field,
- wherein each of the TX electrodes extends from the one end to the opposite end across the capacitive sense array such that the one end and the opposite end are located on opposite sides of the capacitive sense array, and
- wherein the plurality of electrodes of the capacitive sense array operating in a first mode are configured to operate as TX and RX electrodes of a mutual capacitive sense array to detect touch objects;
- and
- a processing device configured to generate a synchronized signal based on the magnetic field, wherein the synchronized signal is received by the plurality of electrodes of the capacitive sense array operating in the second mode as RX electrodes to detect the stylus.
2 more elements
Dependencies are inferred from the claim text.