Stylus to host synchronization
AssigneeWacom Co., Ltd.
InventorsViktor Kremin, Andriy Ryshtun, David Wright, Jeff M. Boschee
Life of this patent
Estimating the term…
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 synchronization signal is transmitted to the stylus using the plurality of electrodes. The synchronization signal is transmitted to the stylus by capacitively coupling the stylus to the capacitive sense array.
Claims23
A signal processing device configured to be coupled to a sensor array including first electrodes disposed along a first direction and second electrodes disposed along a second direction different from the first direction, the signal processing device comprising:
- a signal generator configured to generate a first sensor transmission signal;
- and
- a processor coupled to the signal generator and configured to:
- transmit the first sensor transmission signal capacitively via the sensor array to an active stylus, wherein the first sensor transmission signal includes information that configures the active stylus and the first sensor transmission signal allows the active stylus to determine when to transmit a stylus transmission signal to the sensor array;
- receive capacitively via the sensor array the stylus transmission signal transmitted from the active stylus in response to the first sensor transmission signal;
- and
- detect the active stylus on the sensor array based on the stylus transmission signal received via the sensor array,
- wherein the first sensor transmission signal is distinguishable from the stylus transmission signal in signal types, and the first sensor transmission signal is generated based on a code.
An active stylus configured to indicate a position on a sensor array including first electrodes disposed along a first direction and second electrodes disposed along a second direction different from the first direction, the active stylus comprising:
- signal reception circuitry which, in operation, capacitively receives a first sensor transmission signal from the sensor array, wherein the first sensor transmission signal includes information to configure the active stylus, and determines when to transmit a stylus transmission signal based on the received first sensor transmission signal;
- and
- signal transmission circuitry which, after the signal reception circuitry receives the first sensor transmission signal, transmits the stylus transmission signal in response to the first sensor transmission signal, wherein the stylus transmission signal is configured based on the information in the first sensor transmission signal and is modulated based on at least one of amplitude, frequency, phase, and code.
A signal processing device configured to be coupled to a sensor array including first electrodes disposed along a first direction and second electrodes disposed along a second direction different from the first direction, the signal processing device comprising:
- a signal generator configured to generate a first sensor transmission signal based on a code and generate a second sensor transmission signal;
- and
- a processor coupled to the signal generator and configured to:
- transmit the first sensor transmission signal and the second sensor transmission signal capacitively via the sensor array, wherein the first sensor transmission signal includes information that configures an active stylus and the first sensor transmission signal allows the active stylus to determine when to transmit a stylus transmission signal to the sensor array;
- receive capacitively via the sensor array the stylus transmission signal transmitted from the active stylus in response to the first sensor transmission signal;
- and
- detect the active stylus on the sensor array based on the stylus transmission signal received via the sensor array,
- wherein the stylus transmission signal is distinguishable from the first sensor transmission signal in signal types.
A method implemented by a signal processing device configured to be coupled to a sensor array including first electrodes disposed along a first direction and second electrodes disposed along a second direction different from the first direction, the method comprising:
- generating a first sensor transmission signal;
- transmitting the first sensor transmission signal capacitively via the sensor array to an active stylus, wherein the first sensor transmission signal includes information that configures the active stylus and the first sensor transmission signal allows the active stylus to determine when to transmit a stylus transmission signal to the sensor array;
- receiving capacitively via the sensor array the stylus transmission signal transmitted from the active stylus in response to the first sensor transmission signal;
- and
- detecting the active stylus on the sensor array based on the stylus transmission signal received via the sensor array,
- wherein the first sensor transmission signal is distinguishable from the stylus transmission signal in signal types, and the first sensor transmission signal is defined based on a code.
A method implemented by an active stylus configured to indicate a position on a sensor array including first electrodes disposed along a first direction and second electrodes disposed along a second direction different from the first direction, the method comprising:
- capacitively receiving a first sensor transmission signal from the sensor array, wherein the first sensor transmission signal includes information to configure the active stylus, and determining when to transmit a stylus transmission signal based on the received first sensor transmission signal;
- and
- transmitting the stylus transmission signal in response to the first sensor transmission signal, wherein the stylus transmission signal is configured based on the information in the first sensor transmission signal and is modulated based on at least one of amplitude, frequency, phase, and code.
Dependencies are inferred from the claim text.