A substantially transparent and preferably textured diffuser element disposed in surmounting relation to an array of light emitting diodes intended to illuminate a legend-bearing sign panel of an exit sign or similar illuminated sign, the invention allows compact sign enclosure formation and provides...http://www.google.es/patents/US5954423?utm_source=gb-gplus-sharePatente US5954423 - Light distribution diffuser for exit signs and the like illuminated by LED arrays
Light distribution diffuser for exit signs and the like illuminated by LED ...
