Abstract
Recently, compactness of Head Mounted Display (HMD) product has been strongly required to improve comfortableness of user. The folded optics, so‐called ‘Pancake optics', is suitable for realizing compact HMD, but there is a big drawback of lowering light efficiency. To overcome this problem, we propose novel pancakebased HMD optics named ‘Double path pancake optics' using two light paths. The optical simulation is performed and we fixed the appropriate design. From our simple evaluation of transmittance, we conclude that light efficiency of ‘Double path pancake optics' becomes 1.8 times higher than conventional pancake optics. We made the prototype using 1,200ppi high resolution Liquid Crystal Display (LCD) and confirmed that the high image quality can be displayed.
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