LIGHTING AND/OR SIGNALLING DEVICE SUCH AS A HEADLAMP OR A LIGHT FOR AN AUTOMOBILE

The invention relates to a lighting and/or signaling device for a motor vehicle, said device comprising a housing (1) inside which are disposed at least one main light source (2,3), at least one reflector (4) associated with the main light source(s), optionally at least one intermediate screen (6) substantially transparent and facing said main light source(s) or at least one thereof, and a closure pane of the housing (5). At least one of the faces of the closure pane (5) and/or of the optional intermediate screen (6) is provided with a plurality of light diffusion foci (10) formed by superficial alterations of said face.