High-Quality Holographic 3D Display System Based on Virtual Splicing of Spatial Light Modulator

Holographic 3D display technology is a kind of naked-eye 3D display technology that can realize the undifferentiated fusion of the virtual reconstructed image and real scene without causing visual fatigue in viewers. However, constrained by narrow viewing angle, small size, and serious speckle noise, the progress of current holographic 3D display technology is hampered. In this paper, a high-quality holographic 3D display system based on virtual splicing of spatial light modulators (SLMs) is proposed. By using the temporal division multiplexing method and two specially tailored beam deflection elements, a large-scale virtual splicing of SLMs is realized. Meanwhile, a physical model-driven network (PMD-Net) is proposed, which is able to quickly calculate a noise-suppressed hologram within 100 ms. Based on the PMD-Net, two hologram calculation methods are designed to realize the large viewing angle and large size holographic 3D display, respectively. With the proposed system, the viewing angle and size of the reconstructed image are enlarged by 3 times, respectively. Moreover, the speckle noise is reduced by 50% compared with the traditional methods. The proposed system realizes a high-quality holographic 3D display effect and is expected to be applied in education, entertainment, and medical fields.