Comparison of different designs of head mounted displays with large field of view
Bo Chen, Alois Herkommer · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2017
Mixed reality head mounted display (HMD) freeform prism systems are widely applied with one surface in total internal reflection (TIR). This however limits the angle of the incident rays and decreases the design freedom. To avoid this, two seldom used design forms of HMD systems are studied and compared to the general applied TIR HMD optics. One of them is a catadioptric HMD system, consisting of one lens and two mirrors, the other is a prism HMD with a different folding geometry. The designs are compared for a field of view of 40°×30° and an increased field of view of 50°×30°. The evaluation indicates good performance; in particular the prism with an alternate folding geometry indicates advantages in both performance and size.