tailieunhanh - Advances in Lasers and Electro Optics Part 15

Tham khảo tài liệu 'advances in lasers and electro optics part 15', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 29 Holographic 3-D Displays - Electro-holography within the Grasp of Commercialization Stephan Reichelt Ralf Haussler Norbert Leister Gerald Ftitterer Hagen Stolle and Armin Schwerdtner SeeReal Technologies Germany 1. Introduction Holography is a diffraction-based coherent imaging technique in which a complex threedimensional object can be reproduced from a flat two-dimensional screen with a complex transparency representing amplitude and phase values. It is commonly agreed that real-time holography is the ne plus ultra art and science of visualizing fast temporally changing 3-D scenes. The integration of the real-time or electro-holographic principle into display technology is one of the most promising but also challenging developments for the future consumer display and TV market. Only holography allows the reconstruction of naturallooking 3-D scenes and therefore provides observers with a completely comfortable viewing experience. But to date several challenges have prevented the technology from becoming commercialized. But those obstacles are now starting to be overcome. Recently we have developed a novel approach to real-time display holography by combining an overlapping sub-hologram technique with a tracked viewing-window technology Schwerdtner Leister Haussler 2007 Schwerdtner Haussler Leister 2007 . For the first time this enables solutions for large screen interactive holographic displays Stolle Haussler 2008 Reichelt et al. 2008 . This chapter presents these novel solutions for large real-time holographic 3-D displays in the context of previous and current approaches to electro-holography. The holographic display developed by us combines a tailored holographic recording scheme with active tracking of the observer. This unique approach dramatically reduces the demand for the space-bandwidth product of the hologram and thus allows the use of state-of-the-art spatial light modulators and enables real-time calculation. The fundamentals and challenges of the