Sensor controller
An auxiliary device according to the present disclosure includes a ruler part, a plurality of electrodes provided at the ruler part, a receiving electrode for receiving an uplink signal transmitted from a sensor controller, and a processor that transmits a downlink signal to the sensor controller while sequentially switching the plurality of electrodes in response to reception of the uplink signal.
1. A sensor controller that detects one or more styluses by using a sensor electrode group, comprising:
a processor; and
a memory storing processor readable instructions that, when executed by the processor, cause the sensor controller to:
transmit a first signal that represents a setting instruction that gives a local identifier to a first stylus that has not been detected in each frame of a plurality of frames,
transmit a second signal including the local identifier regarding which an instruction of setting has been made by the setting instruction to a second stylus that has been detected in each of a plurality of slots included in the frame, and
detect a first downlink signal transmitted from the second stylus in response to the second signal,
wherein the sensor controller, in operation, controls a display panel,
wherein a common electrode or a pixel electrode of the display panel is part of the sensor electrode group,
wherein the frame is during a display operation period of the display panel, and
wherein the second signal notifies a timing of a blank period corresponding to the slots.
2. The sensor controller according to claim 1 , wherein the second signal has a shorter time length than the first signal.
3. The sensor controller according to claim 1 , wherein
if a plurality of signals transmitted from a plurality of the styluses at a plurality of positions is detected in one slot of the slots, the sensor controller further transmits a reset signal that deallocates the local identifier to one or more of the plurality of the styluses.
4. The sensor controller according to claim 3 , wherein
the sensor controller transmits the reset signal to the one or more of the plurality of the styluses by transmitting the reset signal from a partial region of the sensor electrode group.
5. The sensor controller according to claim 3 , wherein
the sensor controller transmits the reset signal to the one or more of the plurality of the styluses using a communication that is different from a communication through capacitive coupling using the sensor electrode group.