US 12,067,187 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 Apr. 20, 2023, as Appl. No. 18/304,224.
Application 18/304,224 is a continuation of application No. 17/559,946, filed on Dec. 22, 2021, granted, now 11,669,193.
Application 17/559,946 is a continuation of application No. 16/928,875, filed on Jul. 14, 2020, granted, now 11,216,107, issued on Jan. 4, 2022.
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. 2018-189838 (JP), filed on Oct. 5, 2018.
Prior Publication US 2023/0259229 A1, Aug. 17, 2023
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 3/04186 (2019.05); G06F 3/044 (2013.01); G06F 3/0446 (2019.05)] 12 Claims
OG exemplary drawing
 
1. A position detection circuit connected to a capacitive touch sensor formed with a plurality of line electrodes that are two-dimensionally arranged, the position detection circuit comprising:
at least one processor device; and
at least one memory device storing processor-readable instructions that, when executed by the at least one processor device, cause the position detection circuit to:
acquire two-dimensional data indicating a distribution of detection values of capacitance on the capacitive touch sensor;
in response to recognizing a foreign object on the capacitive touch sensor based on the two-dimensional data, compare the two-dimensional data with a first threshold to detect a first touch position or a first touch area on the capacitive touch sensor at which a detection value indicated by the two-dimensional data exceeds the first threshold; and
in response to not recognizing a foreign object on the capacitive touch sensor based on the two-dimensional data, compare the two-dimensional data with a second threshold that is greater than the first threshold to detect a second touch position or a second touch area on the capacitive touch sensor at which a detection value indicated by the two-dimensional data exceeds the second threshold.