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A Highly Accurate, Stretchable Touchpad for Robust, Linear, and Stable Tactile Feedback
Author(s) -
Shao Ruomei,
Wang Chunnan,
Wang Guiqiang,
Zhao Jingru,
Sun Shuqing
Publication year - 2020
Publication title -
advanced materials technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.184
H-Index - 42
ISSN - 2365-709X
DOI - 10.1002/admt.201900864
Subject(s) - touchpad , tactile sensor , linearity , computer science , stretchable electronics , transparency (behavior) , capacitive sensing , materials science , interface (matter) , electronics , self healing hydrogels , computer hardware , artificial intelligence , electrical engineering , engineering , robot , bubble , polymer chemistry , operating system , maximum bubble pressure method , parallel computing , computer security
A stretchable and steady performance of human–machine interfaces and localized tactile perception is a broad concerning problem. Existing tactile sensors and touchpads claim to be stretchable for location detection failing to offer a location with uniformity during inevitable flexible movements, as well as linearity. The fabrication of a highly stretchable and transparent touch sensor, which is made of hydrogels and PDMS, could simultaneously and precisely determine location and pressure while being stretched or unstretched. It is noteworthy that the sensor introduces a new structure of resistant‐system into stretchable sensors, which needs only four electrodes in 3D helical structure without sacrificing linearity. A few drops of silicone oil are added to the interfaces to prevent the dehydration of the hydrogels, which is a common problem leading to device failure. In the same time, the transparency is improved significantly from 84.3% to 96%. Its interface application is demonstrated by practically using it for drawing, dialing numbers, calculating, and playing cards. Finite element analysis based on Ogden models indicates that the sensor shows instant response without delay, which is vital for super‐elastic materials based electronics.