Abstract
A colour holographic display is considered the ultimate apparatus to provide the most natural 3D viewing experience. It encodes a 3D scene as holographic patterns that then are used to reproduce the optical wavefront. The main challenge at present is for the existing technologies to cope with the full information bandwidth required for the computation and display of holographic video. We have developed a dynamic coarse integral holography approach using opto-mechanical scanning, coarse integral optics and a low space-bandwidth-product high-bandwidth spatial light modulator to display dynamic holograms with a large space-bandwidth-product at video rates, combined with an efficient rendering algorithm to reduce the information content. This makes it possible to realise a full-parallax, colour holographic video display with a bandwidth of 10 billion pixels per second, and an adequate image size and viewing angle, as well as all relevant 3D cues. Our approach is scalable and the prototype can achieve even better performance with continuing advances in hardware components.
Highlights
Holography uses diffraction from encoded fringe patterns to reconstruct the light wavefront of a real or synthetic scene
To create a dynamic holographic display, the holographic fringe patterns are presented on a spatial light modulator (SLM), and an updatable wavefront of a 3D image is reconstructed with suitable illumination
The dynamic Coarse Integral Holographic Display (CIHD) as proposed here uses optomechanical scanning and coarse integral optics to angularly tile an array of holograms created by a single low space bandwidth product (SBP) but high information bandwidth (SBP × pattern rate) modulator
Summary
Holography uses diffraction from encoded fringe patterns to reconstruct the light wavefront of a real or synthetic scene. To create a dynamic holographic display, the holographic fringe patterns are presented on a spatial light modulator (SLM), and an updatable wavefront of a 3D image is reconstructed with suitable illumination. Optics can increase the FOV but only at the expense of the image size, and vice versa, due to the optical invariant; the optics do not change the optical extent nor the SBP of the system These pixelated SLMs often have quantized modulation levels, and care must be taken to ensure they have the ability to present all the information contained in the desired hologram. The dynamic Coarse Integral Holographic Display (CIHD) as proposed here uses optomechanical scanning and coarse integral optics to angularly tile an array of holograms created by a single low SBP but high information bandwidth (SBP × pattern rate) modulator.
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