Multi-pupil expansion light guide assembly with rod

Abstract

A system includes a transparent rod, a light guide assembly, and first and second transparent monolithic optical parts (TMOPs) having the same refractive index. The first TMOP has a first surface having two prism arrays separated by a flat surface having a partially reflective coating, and an opposite second flat surface. Each prism array has two prisms having first and second surfaces oblique to each other. The prism arrays' first surfaces have a partially reflective coating contrary to the second surfaces. The second TMOP has a surface having a geometrically complementary shape relative to the first TMOP first surface's shape and has an opposite second flat surface. When assembled using a first optically transparent adhesive, the first and second TMOPs' second surfaces are parallel. The rod has a partially reflective gradient coating on one surface where it's assembled with the light guide assembly using a second optically transparent adhesive.