Multiple light emitting diode testing method for traffic light

摘要

The device evaluates the light from the light emitting diodes (1) using light sensitive elements. The light emitting diodes in a field or part of a field are embedded in a common flat light conductor (2) and part (4.1) of their emitted light (4) is coupled into the conductor, which has inward reflective coatings (2.1,2.2) and at least one integral light sensitive element (3) or one connected to a non-reflective point. The diodes of a field or part of a field are switched on individually in succession, whereby at least one light sensitive element detects the light from the activated diode or diodes and converts it into a corresp. signal.