Figure 21.

Non-contact gesture-control application. (a) Schematic drawing and process flow of the non-touch gesture-control system. (b) Photographs of the ultrathin TENG on a screen protector before and after being attached to a mobile phone. (c) Induced voltage signal from the screen before scratch and after healing, by waving the hand with the glove above the screen at a distance of ~2 cm. (d) Waving the hand above the screen during a phone call. (e) Answering the phone call after the waving. Reprinted with permission from [157]. Copyright 2023 Elsevier Ltd.