Abstract
Holographic displays can provide a 3D visual experience to multiple users without requiring special glasses. By precisely tailoring light fields, holographic displays could resemble realistic 3D scenes with full motion parallax and continuous depth cues. However, available holographic displays are unable to generate such scenes given practical limitations in wavefront modulation. In fact, the limited diffraction angle and small number of pixels of current wavefront modulators derive into a 3D scene with small size and narrow viewing angle. We propose a flat-panel wavefront modulator capable of displaying large dynamic holographic images with wide viewing angle. Specifically, an ultrahigh-capacity non-periodic photon sieve, which diffracts light at wide angles, is combined with an off-the-shelf liquid crystal display panel to generate holographic images. Besides wide viewing angle and large screen size, the wavefront modulator provides multi-colour projection and a small form factor, which suggests the possible implementation of holographic displays on thin devices.
Highlights
Holographic displays can provide a 3D visual experience to multiple users without requiring special glasses
Unlike 2D image-based stereoscopic displays, which reportedly cause headache, eyestrain, visual discomfort, and fatigue to users given vergence–accommodation conflicts[1], holographic displays are comfortable for the user and provide realistic 3D scenes with full motion parallax and continuous depth cues[2,3,4]
The pinholes diffract the light fields at wide angles[20,21], increasing the viewing angle of the holographic images
Summary
Holographic displays can provide a 3D visual experience to multiple users without requiring special glasses. We propose a flat-panel wavefront modulator capable of displaying large dynamic holographic images with wide viewing angle. An ultrahigh-capacity non-periodic photon sieve, which diffracts light at wide angles, is combined with an off-the-shelf liquid crystal display panel to generate holographic images. Unlike real objects, whose light scatters in every direction and can be observed from any perspective, the viewing (i.e., twice of diffraction) angle of a 3D scene generated using the available SLMs is limited to few degrees, θ = 2sin−1(λ/2p), where λ is the wavelength of light and p is the pixel pitch of the display. We propose a flat-panel wavefront modulator for generating 3D dynamic holographic images endowed with large-area and wide viewing angle. A one-to-one linear relation between pinholes and pixels of the LCD panel allows full independent modulation of the light field scattered from each pinhole to generate the dynamic holographic images. Dynamic colour images are rendered using a single modulator and without requiring colour filters
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