US 12,307,055 B2
Electrostatic capacitance type touch panel system and method based on environmental temperature and second derivative of a pressing force
Takuma Yamamoto, Kameyama (JP); Takenori Maruyama, Kameyama (JP); Shinji Yamagishi, Kameyama (JP); Kazutoshi Kida, 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 Feb. 7, 2024, as Appl. No. 18/434,832.
Claims priority of application No. 2023-034048 (JP), filed on Mar. 6, 2023.
Prior Publication US 2024/0302923 A1, Sep. 12, 2024
Int. Cl. G06F 3/044 (2006.01); G06F 3/041 (2006.01)
CPC G06F 3/044 (2013.01) [G06F 3/0412 (2013.01); G06F 3/0414 (2013.01)] 7 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;
a temperature detection device configured to detect an environmental temperature of the electrostatic capacitance type touch panel; and
a controller configured to control the electrostatic capacitance type touch panel,
wherein the controller:
provides a drive signal to the drive electrode, acquires a signal value from the position detection electrode,
acquires a signal value from the pressing force detection electrode,
detects a pointed position by a pointer based on the signal value acquired from the position detection electrode,
acquires a first derivative value and a second derivative value of a pressing force value based on the signal value acquired from the pressing force detection electrode,
determines a presence or an absence of a pressing operation at the pointed position based on the second derivative value of the pressing force value when the environmental temperature is outside a temperature range including a temperature of the pointer, and
determines the presence or the absence of the pressing operation at the pointed position, based on the first derivative value of the pressing force value, when the environmental temperature is within the temperature range.