As an approach for a 3D real image display system without special glasses, a Fresnel lens-based 3D rear-projection display system is implemented. In this display system, the conventional 2D video image is projected into the air through some projection optics, a screen and a pair of Fresnel lens and as a result, it can form a floating video image having a real depth. But in the conventional floating display system some image distortions might be occurred in the floating image plane, in which a flat screen has been mostly used for providing an adequate input image plane. In this paper, as a new approach to alleviate this image distortion problem, a Fresnel lens-based floating display system employing a curved screen is suggested and some computer simulations and practical experiments are carried out. That is, optimum design parameters of a curved screen for reducing image distortion is found out through some computer simulation using an optics design program of Light Tools and its performance in the floating system is experimentally verified and compared with those of the flat screen. Experimental results with a curved screen shows some decrease of image distortion in the floating image plane by comparing with that of the flat screen. This feasibility test suggests a possibility of implementation of a new Fresnel lens-based 3D projection display system with improved image distortion using a curved screen.
In this paper, a new color LCoS(liquid crystal on silicon)-based holographic full-color 3D display system is proposed. As the color LCoS SLM can produce a full-color image pattern using a color wheel, only one LCoS panel is required in this approach for full-color reconstruction of a 3D object. In the proposed method, each color fringe-pattern is generated and tinted with each color beam. R, G, B fringe-patterns are mixed up and displayed on the color LCoS SLM. And then, Red fringe-pattern can be diffracted at the red status of a color wheel and at the same manner Green/ Blue fringe-patterns can be diffracted at the green/ blue status of a color wheel, so that a full-color electro-holographic 3D image can be easily reconstructed by using some simple optics. From some experiments, a possibility of implementation of a new compact LCoS-based holographic full-color 3D video display system is suggested.
As an approach for a 3D real image display system without special glasses, a Fresnel lens‐based 3D rear‐projection display system is implemented. In this display system, the conventional 2D video image is projected into the air through some projection optics, a screen and a pair of Fresnel lens. As a result, it can form a floating video image having a real depth. In this paper we suggest the method to compensate the image distortion in floating display system. and we have measured the image depth and viewing angle of floating image about the various type of Fresnel lens array in floating display system using curved screen.
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