Frustrum reflector plate

A backlight reflector, comprising:

• a plurality of frustrum prism structures aligned along a common plane, the prism structures comprising a plurality of trapezoidal surfaces, a first base, and a second base parallel to the first base, wherein the first base has a larger surface area than the second base;
• and
• a planar layer coupled to each of the prism structures;
• wherein:
• each of the plurality of prism structures receive refracted light from a light guide and return the light incident to the light guide;
• the second base of each of the plurality of prism structures are coupled to a surface of the planar layer;
• and
• the first base is adjacent the light guide.

A method of forming a backlight reflector for a lighting system, comprising:

• with a three-dimensional printing device:
• forming a frustrum prism onto a planar surface, the frustrum prism comprising a first base and a second base which second base is parallel to the first base, wherein:
• the first base has a larger surface area than the second base;
• and
• the second base is coupled to the surface of the planar surface;
• and
• placing the frustrum prism behind a light guide, wherein the first base is adjacent the light guide.