US 11,928,302 B2
Touch panel device
Takeshi Ono, Tokyo (JP); Tae Orita, Tokyo (JP); Seiichiro Mori, Tokyo (JP); Yusuke Shimasaki, Tokyo (JP); Yuichi Sasaki, Tokyo (JP); and Masaya Nidaira, Tokyo (JP)
Assigned to MITSUBISHI ELECTRIC CORPORATION, Tokyo (JP)
Appl. No. 17/636,376
Filed by Mitsubishi Electric Corporation, Tokyo (JP)
PCT Filed Sep. 4, 2019, PCT No. PCT/JP2019/034690
§ 371(c)(1), (2) Date Feb. 18, 2022,
PCT Pub. No. WO2021/044537, PCT Pub. Date Mar. 11, 2021.
Prior Publication US 2022/0291784 A1, Sep. 15, 2022
Int. Cl. G06F 3/044 (2006.01); G06F 3/041 (2006.01)
CPC G06F 3/0447 (2019.05) [G06F 3/04164 (2019.05); G06F 3/0445 (2019.05); G06F 3/0446 (2019.05); G06F 2203/04103 (2013.01); G06F 2203/04105 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A touch panel device comprising:
a cover panel having a front surface including an operation region on which a touch operation is to be performed and a back surface as a surface on a side opposite to the front surface;
a first adhesive material on the back surface:
a touch panel including a base substrate and a plurality of touch sensor electrodes on a region of the base substrate corresponding to the operation region and facing the back surface via the first adhesive, material;
a first displacement detection electrode on a part of the back surface outside a region of the back surface corresponding to the operation region;
a plurality of second displacement detection electrodes on a part of the base substrate outside the region of the base substrate corresponding to the operation region and facing the first displacement detection electrode; and
a pressing force detector to detect pressing force based on capacitance between the first displacement detection electrode and each of the plurality of second displacement detection electrodes, wherein
when the pressing force is applied to the operation region, the capacitance between the first displacement detection electrode and each of the plurality of second displacement detection electrodes changes based on a difference between displacement of the cover panel and displacement of the base substrate,
the plurality of the second displacement detection electrodes include a third displacement detection electrode and a fourth displacement detection electrode that are electrically independent of each other,
the pressing force detector detects the pressing force based on a difference between first capacitance and second capacitance, the first capacitance being capacitance between the first displacement detection electrode and the third displacement detection electrode, the second capacitance being capacitance between the first displacement detection electrode and the fourth displacement detection electrode,
the base substrate has a first surface with the second displacement detection electrode,
the first surface is in a shape having a plurality of corners in a plan view, and
the third displacement detection electrode includes corner electrode parts in vicinal regions of the corners.