We print the capacitive touch buttons/sensors on the PET circuit with transparent conductive ink. We also use ITO etching technology to make the capacitive touch buttons/sensors. Through the customized IC chip to control the touch function wanted. Except for the capacitive touch keypads we also manufacture the capacitive touch sensor circuits. With capacitive touch technology, the overlay materials can be very diverse and not only limited to PET or PC super thin films. For the normal membrane keypads, the function is triggered by the mechanical buttons(metal domes or Polydome), and also the common membrane keypads only can use PET or PC film for the graphic overlay. Use a heavy force to press the buttons to make the conductive pads of the Polydome or metal domes connected to the conductive pads on the circuit layer, then become a loop circuit and occur the function. But for the capacitive touch membrane keypads or circuits, it is different. We use a variety of overlay materials such as thick glass, PMMA, Polycarbonate panels, etc. The material choice is no longer limited to only a very thin film material, on the contrary, the options are not endless. In addition, the capacitive touch keypad no longer needs heavy force to press buttons, you only need tiny touch the buttons, then the sensor pad can connect the circuit loop and occur the function.
