US 12,130,158 B2
Touch sensor device and electronic device equipped with touch sensor device
Kazutoshi Ono, Kanagawa (JP); Nobuhiko Shigyo, Kanagawa (JP); and Hideo Maeda, Kanagawa (JP)
Assigned to SONY SEMICONDUCTOR SOLUTIONS CORPORATION, Kanagawa (JP)
Appl. No. 17/760,403
Filed by SONY SEMICONDUCTOR SOLUTIONS CORPORATION, Kanagawa (JP)
PCT Filed Dec. 28, 2020, PCT No. PCT/JP2020/049178
§ 371(c)(1), (2) Date Aug. 9, 2022,
PCT Pub. No. WO2021/166464, PCT Pub. Date Aug. 26, 2021.
Claims priority of application No. 2020-024260 (JP), filed on Feb. 17, 2020.
Prior Publication US 2023/0074648 A1, Mar. 9, 2023
Int. Cl. G01D 5/24 (2006.01); G06F 3/041 (2006.01); G06F 3/044 (2006.01)
CPC G01D 5/24 (2013.01) [G06F 3/04186 (2019.05); G06F 3/044 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A touch sensor device, comprising:
circuitry configured to:
drive an electrode having a capacitance that changes due to contact, wherein
the electrode is driven based on a voltage having a waveform of a specific shape,
the voltage gradually changes from a first voltage value that is higher than a reference voltage to a second voltage value that is lower than the reference voltage, and from the second voltage value to the first voltage value;
monitor a drive current obtained by a driving operation of the electrode;
perform full-wave rectification of the monitored drive current;
smooth the rectified drive current; and
convert the rectified drive current, that is smoothened, to a current that corresponds to the capacitance of the electrode.