US 11,789,564 B2
Touch panel system, display device, and method for controlling touch panel system
Takuma Yamamoto, Sakai (JP); Hiroshi Fukushima, Sakai (JP); Kazutoshi Kida, Sakai (JP); Takenori Maruyama, Sakai (JP); Shinji Yamagishi, Sakai (JP); and Yasuhiro Sugita, Sakai (JP)
Assigned to SHARP KABUSHIKI KAISHA, Osaka (JP)
Filed by SHARP KABUSHIKI KAISHA, Sakai (JP)
Filed on Nov. 4, 2021, as Appl. No. 17/518,834.
Claims priority of application No. 2020-194658 (JP), filed on Nov. 24, 2020.
Prior Publication US 2022/0164060 A1, May 26, 2022
Int. Cl. G06F 3/041 (2006.01); G06F 3/044 (2006.01)
CPC G06F 3/0418 (2013.01) [G06F 3/0414 (2013.01); G06F 3/0447 (2019.05)] 11 Claims
OG exemplary drawing
 
1. A touch panel system comprising:
an electrostatic capacitance type touch panel including a drive electrode, a position detection electrode, and a pressing force detection electrode; and
a controller configured to provide a drive signal to the drive electrode and acquire signal values from each of the position detection electrode and the pressing force detection electrode,
wherein the controller detects a position of a pointer based on the signal value acquired from the position detection electrode, and acquires a pressing force generated by the pointer based on a rate of change of a pressing force value based on the signal value acquired from the pressing force detection electrode or a rate of change of a smoothed value of the pressing force value,
wherein the controller includes:
a signal acquisition unit configured to acquire, for each unit time, signal values from each of the position detection electrode and the pressing force detection electrode;
a position detection unit configured to detect the position of the pointer when the signal value acquired from the position detection electrode becomes equal to or greater than a position detection threshold value continuously a plurality of times; and
a rate of change acquisition unit configured to acquire the rate of change of the pressing force value or the rate of change of the smoothed value of the pressing force value from a point in time when the signal value acquired from the position detection electrode becomes equal to or greater than the position detection threshold value.