US 11,669,193 B2
Position detection circuit and position detection method
JuiMin Liu, Tokyo (JP); and Shigeyuki Sano, Kanagawa (JP)
Assigned to Wacom Co., Ltd., Saitama (JP)
Filed by Wacom Co., Ltd., Saitama (JP)
Filed on Dec. 22, 2021, as Appl. No. 17/559,946.
Application 17/559,946 is a continuation of application No. 16/928,875, filed on Jul. 14, 2020, granted, now 11,216,107.
Application 16/928,875 is a continuation of application No. 16/279,160, filed on Feb. 19, 2019, granted, now 10,747,358, issued on Aug. 18, 2020.
Claims priority of provisional application 62/634,030, filed on Feb. 22, 2018.
Claims priority of application No. JP2018-189838 (JP), filed on Oct. 5, 2018.
Prior Publication US 2022/0113830 A1, Apr. 14, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. G06F 3/045 (2006.01); G06F 3/041 (2006.01); G06F 3/044 (2006.01)
CPC G06F 3/0416 (2013.01) [G06F 3/044 (2013.01); G06F 3/04186 (2019.05); G06F 3/0446 (2019.05)] 10 Claims
OG exemplary drawing
 
1. A position detection method performed by one or more processors using a capacitive touch sensor formed with a plurality of line electrodes that are two-dimensionally arranged, the method comprising:
acquiring first two-dimensional data indicating a first distribution of detection values of capacitance on the touch sensor;
recognizing that a foreign object is present in an area on the touch sensor based on the first two-dimensional data;
in response to the recognizing that the foreign object is present in the area on the touch sensor based on the first two-dimensional data, using a first threshold that is lower than a second threshold for detecting a first touch position or touch area inside of the area on the touch sensor in which the foreign object is present; and
detecting the first touch position or touch area inside of the area on the touch sensor in which the foreign object is present based on the first two-dimensional data and the first threshold.