Patent ID: 7748148

Claim:
A backlit display sign comprising, a rear sign enclosure element at the back of the sign with a forwardly facing wide mouth opening, a sign front face cover including a light guide formed from a light-transmissive material that has a front surface and a rear surface, said guide extending across the mouth opening of the rear enclosure element to define a light cavity between itself and the rear enclosure element, at least one LED source of visible illumination operatively associated with the sign for illuminating the light cavity, a light reflective surface layer on at least said front surface of the light guide, the light reflective surface layer on the front surface having an opening therein, said surface layer reflecting light rays which emanate from the light source that are within the light guide back into the light guide such that the light guide comprises a light-propagation sustaining channel which enhances the transmission of light through the guide until emitted through said opening in the front light-reflective layer for producing visible symbols, letters, numbers, or other indicia that can be seen by an observer viewing the front surface of the sign, and a forwardly facing light tunnel contained within and surrounded by the light cavity, said tunnel being operatively associated with a LED light source for illuminating a portion of the sign front face cover within the perimeter of the light tunnel to provide a light of a color that is different from the color provided by the at least one LED source of visible illumination and both an inner and an outer surface of the light tunnel comprise light reflective material.