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Novel solutions for large real-time holographic 3D displays are presented. The holographic display combines a tailored holographic recording scheme with active tracking of the observer. This 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 holographic display technology are described, its implementation in prototypes is demonstrated, and the bright prospects for the 3D display market are discussed.