US Patent 11047749 Electronic device

An electronic device is provided that includes a flexible body, a stress sensor, and a detector. The stress sensor has a piezoelectric film that is deformed by a stress resulting from bending of the body. The stress sensor detects stresses that develop respectively at an end part and a central part of the body. When the end part and the central part are bent at the same radius of curvature, the stress sensor outputs output values such that a first output value based on a stress having developed at the end part is different from a second output value based on a stress having developed at the central part. Moreover, the detector detects at least one of the first output value and the second output value having exceeded a given threshold.