The electronic system has an inverter (1) that is coupled by an electronic switch (2) to a dc power supply. This provides an ac supply for an electroluminescent foil that is coupled to terminals (E1,E2). Coupled to the inverter is a diagnostic circuit (8) ...

The light emitted by an array of LEDs (3) illuminates the number plate (2) through a lens (5) that collimates the same light in the transversal direction and diffuses it in the longitudinal direction.