A DISPLAY SIGN AND AN OPTICAL ELEMENT FOR USE IN THE SAME

摘要

An optical element (26) is fitted to a high intensity light emitting diode (10) used in a variable message sign. The optical element (26) has surfaces (30) which redirect any stray light from the light emitting diode (10) to form useful light. The faces (32, 34 & 36) of the optical element (26) are angled to shape the light beam emitted therefrom. The light beam is shaped by the faces (32, 34 & 36) to produce a beam having increased intensity in a predetermined direction. The optical element (26) enhances the visibility of the sign and allows a reduction in the number of light emitting diodes (10) used in the sign.