Shielding Method for the Capacitive Touch-Sensor

Abstract

Capacitive touch technology has been widely used in various applications because it allows intuitive interfaces and is almost without service-life limitation. There are two major limitations of capacitive touch sensors: the sensitivity is low when the sensing area is small and the sensing penetration is poor when the mechanical structure is thick. Here, we propose a shielding strategy for capacitive touch technology to improve the two limitations of sensing sensitivity and penetration. Based on the same test conditions, our proposed approach can improve sensing sensitivity. Hence, our proposed approach allows the replacement of an experiment device with a 50 mm2 sensing area with one with a 7-mm2 sensing area when using a 4 mm-thick cover.