This video demonstrates a wide FOV HMD achieved using a parabolic half-mirror and reflective sheets. Rays that would not pass into the users eyes are reflected by the sheets and focused by the parabolic lens/mirror to achieve a FOV not possible with traditional HMDs.
Related Paper:
Poster: A Virtual Walkthrough System with a Wide Field-of-view Stereo Head Mounted Projective Display
Natsuki TAKEDA, Kiyoshi KIYOKAWA and Haruo TAKEMURA
IEEE Symposium on 3D User Interface 2009 (3DUI 2009), pp. 149-150, Mar. 2009
