Patent ID: 7513668
Filing Date: 2009-04-07
Classification: G02B

Abstract:
1. An illumination system for use in illuminating a spatial light modulator for a head up display system, comprising: a) a high power light emitting diode (LED) array assembly, comprising: b) a Fresnel lens array operatively associated with said LED array assembly for receiving light produced by said LED array assembly and providing a nearly collimated light output for use by a spatial light modulator, said LED light baffle positioned between said plurality of LEDs and said Fresnel lens array; c) a diffuser positioned to receive light from said Fresnel lens array prior to being received by the spatial light modulator; d) at least one brightness enhancement film (BEF) positioned to receive light from said Fresnel lens array prior to being received by the spatial light modulator; and, e) an image directing film (IDF) positioned to receive light from said Fresnel lens array prior to being received by a spatial light modulator, wherein an image is formed at optical infinity.