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US 2026/0277350 A1Published application
Stylus to host synchronization using a magnetic field
AssigneeWacom Co., Ltd.
InventorsViktor Kremin, Andriy Ryshtun
Life of this patent
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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 to detect 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 to detect a stylus, each of TX electrodes of the plurality of electrodes is configured to receive a TX driver electrical current from one end while another end is coupled to a reference voltage such that the TX driver electrical current passing through the TX electrode from the one end to the another end generates a magnetic field which 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 another end across the capacitive sense array such that the one end and the another end are located on opposite sides of the capacitive sense array.
1 more element
A method comprising:
- providing a plurality of electrodes in a capacitive sense array;
- in a first mode to detect touch objects, operating the plurality of electrodes as TX and RX electrodes of a mutual capacitive sense array;
- and
- in a second mode to detect a stylus, passing a TX driver electrical current from one end to another end of each of TX electrodes of the plurality of electrodes to generate a magnetic field which 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 another end across the capacitive sense array such that the one end and the another end are located on opposite sides of the capacitive sense array.
1 more element
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 receives a TX driver electrical current from one end while another end is coupled to a reference voltage such that the TX driver electrical current passing through the TX electrode from the one end to the another end generates the magnetic field, wherein each of the TX electrodes extends from the one end to the another end across the capacitive sense array such that the one end and the another 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.
Dependencies are inferred from the claim text.