Patent ID: 7548670

Claim:
A light collimating device comprising a wave guide plate ( 100 ) having a first surface ( 101 ), an opposing faceted second surface ( 102 ) comprising a plurality of planar parallel portions ( 103 ) and a plurality of facets ( 104 ) connecting said planar parallel portions ( 103 ) and at least one surface ( 105 ) for receiving light, characterized in that, each facet ( 104 ) is formed at a non-right angle (β) to said planar parallel portions ( 103 ) and, said device further comprises a plurality of collimating refractive elements ( 106 ), wherein each collimating refractive element ( 106 ) corresponds to a separate one of the plurality of facets ( 104 ), and each collimating refractive element ( 106 ) is located in the beam path of at least the major part of light being reflected on the corresponding facet ( 104 ) and extracted from said wave guide plate ( 100 ).