A backlighting, with Electroluminescence (EL) is good for Membrane Keypad, Membrane Switches, is an optical phenomenon and electrical phenomenonin which a material emits light in response to the passage of an electric currentor to a strong electric field. This is distinct from black bodylight emission resulting from heat (incandescence), from a chemical reaction (chemiluminescence), sound (sonoluminescence), or other mechanical action (mechanoluminescence).
more backlighting structure.
Independent of viewing angle
Connections can be located anywhere on the lamp
Versatile drive conditions