  Holographic displays, which enable pixel-level depth control and aberration
correction, are considered the key technology for the next-generation virtual
reality (VR) and augmented reality (AR) applications. However, traditional
holographic systems suffer from limited spatial bandwidth product (SBP), which
makes them impossible to reproduce \textit{realistic} 3D displays.
Time-multiplexed holography creates different speckle patterns over time and
then averages them to achieve a speckle-free 3D display. However, this approach
requires spatial light modulators (SLMs) with ultra-fast refresh rates, and
current algorithms cannot update holograms at such speeds. To overcome the
aforementioned challenge, we proposed a novel architecture, motion-enhanced
holography, that achieves \textit{realistic} 3D holographic displays without
artifacts by continuously shifting a special hologram. We introduced an
iterative algorithm to synthesize motion-enhanced holograms and demonstrated
that our method achieved a 10 dB improvement in the peak signal-to-noise ratio
(PSNR) of 3D focal stacks in numerical simulations compared to traditional
holographic systems. Furthermore, we validated this idea in optical experiments
utilizing a high-speed and high-precision programmable three-axis displacement
stage to display full-color and high-quality 3D focal stacks.
