PCF-based keyboards are composed of two or more levels of polyester film, screen printed using the circuit this is certainly electrically conductive. These two layers tend to be separated by having a spacer which includes environment ports for Perfect procedure for the switch.
These keyboards are available in tactile or types that are non-tactile or without embossing. These keyboards are put together through built-in LEDs either from the level this is certainly the same with the addition of an additional third layer. A glue is supplied at the back once again to attach this keyboard for a backing that is hard like an Aluminium plate.
These keyboards could be illuminated by Electroluminescent lamps or LEDs.