Patent ID: 7950830

Claim:
An illumination system for illuminating a display device, the illumination system comprising: a light source arranged on a source axis, a light-exit window for emitting light generated by the light source, the light-exit window arranged substantially perpendicularly to the source axis and a conical reflector associated with the light source and arranged around the source axis for reflecting light emitted by the light source towards the light-exit window, the reflector tapering from the light-exit window towards the light source and being radially segmented into a plurality of reflector-cone segments; wherein the light-exit window has a polygonal shape and wherein the plurality of reflector-cone segments comprises a plurality of convex-cone segments, each convex-cone segment being convex-shaped in a lateral direction relative to the source axis and having a convex-segment axis intersecting with the source axis and arranged in a first imaginary plane defined by the source axis and intersecting an edge line of the light-exit window, the edge line connecting two neighboring corners of the polygonal shape of the light-exit window for lateral distribution of the light generated by the light source and emitted through the light-exit window, and a plurality of concave-cone segments being concave shaped in lateral direction with respect to the source axis, each concave-cone segment having a concave-segment axis intersecting with the source axis and being arranged in a second imaginary plane defined by the source axis and a corner of the polygonal shape of the light-exit window.