Capacitive touch membrane switches are generally divided into two types: one with touch circuitry etched from an ITO conductive film, and the other with printed transparent conductive ink (PEDOT). ITO conductive film etching offers higher light transmittance but is also more expensive. PEDOT printing is relatively cheaper, has lower light transmittance, and meets the needs of most applications. Currently, the touch membrane switches used in the home appliance and automotive electronics industries are all made with PEDOT.
