Holographic three-dimensional aerial display [Invited]

Although several aerial display techniques have been developed, computer-generated holography (CGH) is widely regarded as the most promising candidate. Nevertheless, achieving high-resolution aerial images through CGH remains challenging due to substantial computational complexity and the requirement for accurate parallax rendering. In this work, we present a novel CGH approach, to the best of our knowledge, based on the depth-added computer-generated holographic stereogram (DA-CGHS) framework to realize aerial display effects. First, we employ a tilt-shift imaging strategy for intensity and depth maps rendering, ensuring that all light rays converge onto the same set of projection points. Subsequently, we determine the optimal size of the hologram tile to compute light-field superposition efficiently. Using the proposed method, we successfully generated an aerial image in dimensions of 50mm×50mm×16mm with a viewing angle of 40° horizontally and 20° vertically.