Method for sensor controller to detect stylus using repeated transmission of control signals, stylus, and system
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United States of America
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Apr 20, 2020
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Apr 20, 2020
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Abstract
A system includes a stylus and a sensor controller couplable to a sensor capable of detecting the stylus. The sensor controller is configured to continuously transmit, via the sensor, first uplink control signals (US_c1) during a continuous transmission period (TCP), which is longer than an interval (WPa) at which the stylus performs a reception operation Rx of an uplink signal from the sensor. The sensor controller is configured to, after the TCP, control a reception operation at the sensor of a downlink signal (DS) from the stylus during a reception period (RDS). The sensor controller is configured to, depending on a result of detection of the DS during the RDS, determine whether or not the stylus is detected by the sensor.
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