3G Technology Inc., a professional capacitive keypad manufacturer, offers customized PEDOT touch sense keys and touch switch modules(PMMAs).

The structure of the Capacitive Touch Sense Keypad: The lower circuit can be Mylar, FPC, or PCB. When fingers contact the circuit, causing the capacitance (PEDOT:PSS) to change, the circuit in the controller can detect the change. The greater the capacitance change, the better the detection effect.

*PEDOT:PSS is a composite of PEDOT and the anionic polymer PSS. It is the key to capacitive touch membrane switches that works by using an electrical field to detect objects in proximity to the switch, which in turn causes the switch to actuate.