Three-dimensional(3D)display technology has attracted worldwide attention and been developed vigorously.Usually,3D displays are classified into two types according to their operation principles.One type is based on binocular parallax with eye-glasses/helmet stereoscopic displays or with parallax barriers or lens array.These techniques are relatively mature and commercial productions are common.The other type,including holographic display,integral imaging display and volumetric display,is based on 3D scene reconstruction.These techniques are currently under active research and lack in commercial productions.Among these 3D display techniques,holographic display is supposed to be the best to provide realistic image of a real object or a scene because holography has the ability to reconstruct both the intensity and wave front information of a true nature of an object or a scene,allowing the observer to perceive the light as it would be scattered by the real object itself without the need for a special eyewear.