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We have developed several kinds of autostereoscopic display systems using one-dimensional integral imaging method. The integral imaging system reproduces light beams similar of those produced by a real object. Therefore our displays have continuous motion parallax. The design, fabrication, and optical evaluation of the displays have been made. By using our proprietary software, the fast playback of the CG movie contents and real-time interaction are also realized with the aid of a graphics card. Realization of the safety 3D images to the human beings is very important. We have measured the effects on the visual function and evaluated the biological effects. We have found that our displays show better results than those to a conventional stereoscopic display. Our display architecture is suitable for flatbed configurations because it has a large margin for viewing distance and angle. Mixed reality of virtual 3D objects and real objects are also realized on a flatbed display. The new technology opens up new areas of application for 3D displays, including communications, arcade games, e-learning, simulations of buildings and landscapes, and even 3D menus in restaurants.