EP2643717

• SWARCO FUTURIT Verkehrssignalsysteme GmbHsince Aug 30, 2013

The invention relates to an optical system for focused light emission, which can be used as a pixel capable of full color in a grid assembly mainly in variable message signs and outdoor electronic display boards. Among other things a commercially available full-color LED in SMD design having a red, a green, and a blue LED crystal acts as the light source (1). Directly in front of the light source lies the inlet surface (3) of a light-guiding rod (2), said inlet surface having approximately the same size. The light-guiding rod (2) has a constant cross-section and a jacket surface made of planes adjacent to each other at sharp edges. The light-guiding rod captures the light substantially completely and completely mixes the different colors and brightnesses very efficiently without the aid of scattering. The light output (4) of the light-guiding rod (2) lies at the focus of a convergent lens (5), which focuses the exiting light. The convergent lens (5) and the light-guiding rod (2) can be combined as one piece. The light exiting the light-guiding rod can be further adapted in the distribution of said light by optically active surfaces or scattering structures that overlie the convergent lens.

From the international application WO2012068603