White-LED luminous signalling device

A luminous signalling device comprising:

• a body made of transparent synthetic material, basically in the form of a plate having two larger faces set opposite to one another, at least one of which bears an image, two end walls, and two longitudinal walls;
• a plurality of LED devices, part of which designed to emit white light, and part of which designed to emit green light, externally coupled to at least one of said end walls or said longitudinal walls, the arrangement being such that the rays of white light coming out of said LED devices undergo multiple total reflections within the plate body, which thus functions as a light guide;
• and
• a distribution of diffusing, diffractive optical elements formed on the face bearing the image in areas corresponding to selected areas of the image designed to diffuse outwards the rays of light that are incident on said areas from within the plate.