Real-time phase-only color holographic video display system using LED illumination

Yaraş, Fahri; Kang, Hoonjong; Onural, Levent

doi:10.1364/ao.48.000h48

Cited by 134 publications

(62 citation statements)

References 27 publications

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“…Reduction of coherence is a frequently applied technique for reducing speckle. However, it limits the space-bandwidth product of the captured signal in both digital holographic recording and holographic displays [25,26]. In this paper we therefore use another solution which has been mentioned in Section 3 in which the temporal bandwidth of the SLMs is used for noise reduction.…”

Section: Resultsmentioning

confidence: 99%

Extended viewing angle holographic display system with tilted SLMs in a circular configuration

et al. 2012

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This paper presents an extended viewing angle holographic display for reconstruction of real world objects in which the capture and display systems are decoupled. This is achieved by employing multiple tilted spatial light modulators (SLMs) arranged in a circular configuration. In order to prove the proper reconstruction and visual perception of holographic images the Wigner distribution function is employed. We describe both the capture system using a single static camera with a rotating object and a holographic display utilizing six tilted SLMs. The experimental results based on the reconstruction of computer generated and real world scenes are presented. The coherent noise removal procedure is described and implemented. The experiments prove the possibility to view images reconstructed in the display binocularly and with good quality.

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Section: Resultsmentioning

confidence: 99%

Extended viewing angle holographic display system with tilted SLMs in a circular configuration

et al. 2012

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“…Traditional computer-generated Fourier Transform holograms [25,26] are designed by retrieving the phase or amplitude profile on the hologram plane using certain algorithms [27]. This retrieved phase is traditionally assumed to arise via the dynamic phase, which is inherently wavelength dependent.…”

Section: Introductionmentioning

confidence: 99%

Far-field and Fresnel Liquid Crystal Geometric Phase Holograms via Direct-Write Photo-Alignment

2017

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Abstract:We study computer-generated geometric-phase holograms (GPHs) realized by photo-aligned liquid crystals, in both simulation and experiment. We demonstrate both far-field and Fresnel holograms capable of producing far-field and near-field images with preserved fidelity for all wavelengths. The GPHs are fabricated by patterning a photo-alignment layer (PAL) using a direct-write laser scanner and coating the surface with a polymerizable liquid crystal (i.e., a reactive mesogen). We study various recording pixel sizes, down to 3 µm, that are easily recorded in the PAL. We characterize the fabricated elements and find good agreement with theory and numerical simulation. Because of the wavelength independent geometric phase, the (phase) fidelity of the replay images is preserved for all wavelengths, unlike conventional dynamic phase holograms. However, governed by the diffraction equation, the size and location of a reconstructed image depends on the replay wavelength for far-field and near-field GPHs, respectively. These offer interesting opportunities for white-light holography.

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“…Nevertheless, it can reduce the amount of calculation since AR device usually shows 2D simple pictures and the relative position between AR and human eye is xed. Some of the non-iterative method, such like accurate compensated phase-added stereogram, can be used in computation [20,21]. The simpli ed calculation make the implementation become more practical.…”

Section: Introductionmentioning

confidence: 99%

Augmented reality using holographic display

Lin¹,

Wu²

2017

Optical Data Processing and Storage

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Augmented reality (AR) provided extra information to the user by applying virtual image onto the real environment. There are many methods achieving AR. Holographic display is one of the potential ways due to its perfect 3D demonstration. Holographic display can provide the virtual 3D object with depth information. It can be realized an AR device with real 3D scene by combing holographic display. However, it is di cult to realize a compact holographic display with wide viewing angle and enough resolution. It limits holographic display to apply to AR. In this paper, we will discuss the requirements of holographic display based on the development of LCD, including resolution (ppi), viewing angle, image quality and backlight. We wish this article can provide preliminary direction for the LCD industry to develop AR technology using holographic display.

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Real-time phase-only color holographic video display system using LED illumination

Cited by 134 publications

References 27 publications

Extended viewing angle holographic display system with tilted SLMs in a circular configuration

Extended viewing angle holographic display system with tilted SLMs in a circular configuration

Far-field and Fresnel Liquid Crystal Geometric Phase Holograms via Direct-Write Photo-Alignment

Augmented reality using holographic display

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