Patent ID: 11914817
Assignee: WACOM CO., LTD.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 0:
1. A position detection system that carries out position detection of an active pen, the position detection system comprising:
a display device that displays image data by driving each of a plurality of pixel electrodes; and
a touch panel including a sensor electrode and a touch sensor,
wherein:
the active pen, in operation, communicates with the touch sensor using a predetermined frequency included in a predetermined frequency band by a charge induced in the sensor electrode,
the display device, in operation, suppresses at least one frequency component included in the predetermined frequency band in capacitive noise that occurs in the sensor electrode due to a voltage vibration in an interconnect in the display device caused by driving of the plurality of pixel electrodes,
the display device selectively operates in either of a first operation mode in which driving of the plurality of pixel electrodes suppresses the at least one frequency component included in the predetermined frequency band in the capacitive noise that occurs in the sensor electrode or a second operation mode in which driving of the plurality of pixel electrodes does not suppress the at least one frequency component included in the predetermined frequency band in the capacitive noise that occurs in the sensor electrode,
the capacitive noise in the first operation mode is suppressed compared with the capacitive noise in the second operation mode,
the second operation mode is a mode in which image quality of the display device is prioritized over accuracy of detection of the active pen by the touch sensor, and
the first operation mode is a mode in which accuracy of detection of the active pen by the touch sensor is prioritized over image quality of the display device.