In this work, we aim to realize a wide viewing-angle and a space saving configuration in a projection-type integral3D display composed of a projector and lens array. In the conventional method, for a wide viewing-angle, lightrays should be incident on the lens array at a large incident angle. In order to achieve a large incident angle,projectors are installed diagonally behind the lens array. This requires a large space for projectors behind thedisplay. We propose a projection method that realizes a wide viewing-angle using a space saving configuration inwhich one projector is installed behind the lens array. In the proposed configuration, two mirrors are arrangedfacing each other between the projector and the lens array. Light rays enter the lens array from the mirrorimage positions of the projector through multiple reflections between these two mirrors. The proposed methodrequires no projector other than the projector installed directly behind the lens array. In this way, wide viewingangleis achieved with a downsized system. First, the proposed configuration was simulated and its feasibilitywas evaluated. Second, based on the simulation results, the specifications of the proposed configuration wereevaluated in the experiment. The actual display system was then prepared for the experiment. As a result ofthe simulation and experiment, a viewing-angle that requires a configuration employing three or more projectorswas realized using a configuration employing one projector.
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