This is the most cost effective method to backlight selective areas using wide variety of substrates, LED styles, sizes and colors.
Fiber optics is an effective way of backlighting large panels and membrane switches. Its flexible fibers are designed for maximum light transmission as well as uniform illumination. The layers are backlit by a LED on the motherboard.
Electroluminescent (EL) is a thin and flexible layer capable of lighting uniformly and is esthetically appealing. It can be designed to light a wide are or discrete locations. EL can be designed to have multiple colors and is a layer in the switch.