Aerial display, which forms a real image in mid-air by converging light from a wide aperture, enables us to realize non-contact touch interfaces and glass-free augmented reality. Optical performance of an aerial display depends on its real-image-forming optics. Typical optical systems for aerial display are optical systems by use of a dihedral corner reflector array, crossed slit mirror arrays, layered micro-lens arrays, and a retro-reflector. This paper reviews optical systems for aerial display and reports the line-based MTF measurement results.
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