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Three-dimensional (3D) display technology, which aims at presenting almost-realistic 3D images to the observer without any auxiliary devices, has drawn great attention from both academia and industry these years. The 3D display based on multi-layer translucent structure is a new parallax-based 3D display model. Compared with conventional parallax barrier and integrated imaging, it can effectively ensure the utilization of light energy and image resolution of the system, expand the screen depth at the same time, and display a realistic virtual 3D scene. In this paper, we implement a flat 3D display using multi-layer translucencies. Based on our prototype of flat 3D display, we further extend it to spatial 3D display using mirroring of a square pyramid, which allows observers to see virtual 3D objects from different directions in the air.
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