US 12,118,164 B2
Touch panel system, display device, and method for controlling touch panel for detecting position and pressure of input
Takenori Maruyama, Kameyama (JP); Kazutoshi Kida, Kameyama (JP); Shinji Yamagishi, Kameyama (JP); Takuma Yamamoto, Kameyama (JP); Yasuhiro Sugita, Kameyama (JP); and Hiroshi Fukushima, Kameyama (JP)
Assigned to Sharp Display Technology Corporation, Kameyama (JP)
Filed by Sharp Display Technology Corporation, Kameyama (JP)
Filed on Mar. 29, 2023, as Appl. No. 18/128,214.
Claims priority of application No. 2022-060997 (JP), filed on Mar. 31, 2022.
Prior Publication US 2023/0315233 A1, Oct. 5, 2023
Int. Cl. G06F 3/041 (2006.01); G06F 3/044 (2006.01)
CPC G06F 3/0418 (2013.01) [G06F 3/0445 (2019.05); G06F 3/0446 (2019.05); G06F 2203/04105 (2013.01); G06F 2203/04107 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A touch panel system comprising:
a capacitive touch panel; and
control circuitry to control the capacitive touch panel,
wherein:
the capacitive touch panel includes includes:
a first substrate, a second substrate,
a first dielectric layer located between the first substrate and the second substrate,
a plurality of drive electrodes located on the first substrate,
a plurality of floating island electrodes located on the first substrate,
a plurality of pressure detection electrodes located on the second substrate, and
a plurality of position detection electrodes located on the second substrate,
each of the plurality of drive electrodes overlaps at least part of a corresponding one of the plurality of pressure detection electrodes, and each of the plurality of floating island electrodes overlaps at least part of a corresponding one of the plurality of position detection electrodes in plan view,
the control circuitry further provides a drive signal to the plurality of drive electrodes and corrects a pressure detection signal obtained from each of the plurality of pressure detection electrodes by using a position detection signal obtained from a position detection electrode, among the plurality of position detection electrodes, that is adjacent to the each of the plurality of pressure detection electrodes,
the control circuitry includes a drive unit, a charge detection unit, and a correction unit,
the drive unit generates the drive signal,
the charge detection unit generates the position detection signal and the pressure detection signal from the position detection electrode and each of the plurality of pressure detection electrodes,
the correction unit corrects the pressure detection signal based on the position detection signal and generates a corrected pressure detection signal, and
the correction unit amplifies the position detection signal and subtracts the amplified position detection signal from the pressure detection signal so as to generate the corrected pressure detection signal.