Methods of backlighting a membrane switch

A) LED:LEDs are most commonly used to backlight keys, icons and symbols. LEDs are also typically used as indicator lights.

B) Light Guide Film (LGF) :Light Guide Film is designed to evenly distribute light from top or side firing LEDs, providing bright, uniformed illumination. It also reduces the amount of LEDs needed.

C) Electroluminescence (EL):EL is applied on a very thin layer between the graphic overlay and the circuit. EL uses a printable ink deposit to illuminate the switch and provide a uniformed illumination.