FIELD: physics, optics.
SUBSTANCE: invention relates to collimators which can be used to illuminate liquid crystal screens. The collimator is in the form of a wedge-like optical waveguide having a first end and a second end opposite to the first end. The first end is thinner than the second end. The collimator also has a visible surface passing at least in part between the first end and the second end, and a back surface opposite the visible surface. The visible surface has a first critical angle, and the back surface is configured to be reflective below the first critical angle. Furthermore, an end reflector, having a polyhedral (faceted) lens, is placed at the second end of the optical waveguide.
EFFECT: reduced overall dimensions of the collimator.
15 cl, 10 dwg
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