Color holographic display with white light LED source and single phase only SLM

Kozacki, Tomasz; Chlipała, Maksymilian

doi:10.1364/oe.24.002189

Cited by 105 publications

(25 citation statements)

References 34 publications

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“…It has been well studied that increasing angle or wavelength diversity of light sources contributes to independent speckle generation and speckle reduction 31 , 33 . Although these methods are applicable for holographic displays, we need to recall that angle or wavelength diversity involves the decline of spatial resolution 22 .…”

Section: Resultsmentioning

confidence: 99%

Light source optimization for partially coherent holographic displays with consideration of speckle contrast, resolution, and depth of field

Lee

Kim

Nam

et al. 2020

Sci Rep

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Speckle reduction is an important topic in holographic displays as speckles not only reduce signal-to-noise ratio but also possess an eye-safety issue. Despite thorough exploration of speckle reduction methods using partially coherent light sources, the trade-off involved by the partial coherence has not been thoroughly discussed. Here, we introduce theoretical models that quantify the effects of partial coherence on the resolution and the speckle contrast. The theoretical models allow us to find an optimal light source that maximizes the speckle reduction while minimizing the decline of the other terms. We implement benchtop prototypes of partially coherent holographic displays using the optimal light source, and verify the theoretical models via simulation and experiment. We also present a criterion to evaluate the depth of field in partially coherent holographic displays. We conclude with a discussion about approximations and limitations inherent in the theoretical models.

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Section: Resultsmentioning

confidence: 99%

Light source optimization for partially coherent holographic displays with consideration of speckle contrast, resolution, and depth of field

Lee

Kim

Nam

et al. 2020

Sci Rep

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show abstract

“…Due to the coherence of the laser, each reconstructed point can form an Airy disk during the holographic reconstruction, and the coherent superposition between these Airy disks will cause the speckle noise [13][14]. Besides, most existing spatial light modulators (SLMs) are of pure phase type, while the spatial distribution of the 3D object is a complex amplitude function [15][16][17][18]. In the optical reconstruction, the complex amplitude function needs to be converted into the phase value.…”

Section: Introductionmentioning

confidence: 99%

Method of Speckle Noise Suppression for Holographic Zoom Display Based on Layered-Pixel-Scanning Algorithm

Wang

Chang

et al. 2020

IEEE Access

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In this paper, a method of speckle noise suppression for holographic zoom display based on layered-pixel-scanning (LPS) algorithm is proposed. Different from the traditional algorithm, the proposed method suppresses the speckle noise based on a new algorithm design and light source optimization. The LPS algorithm is designed to calculate the phase-only hologram of the 3D object. By extracting the initial complex hologram of the 3D object and scanning the hologram by pixel, the errors of the complex amplitude can be reduced as much as possible. Then a hologram subsampling method based on the LPS algorithm generated is proposed, so the scaling of the reproduced image can be achieved easily. At the same time, the pattern with different random phase is generated and loaded on the spatial light modulator so that the reconstructed light can be optimized. When the optimized light irradiates on the phase hologram of the object, the reconstructed image with suppressed speckle noise can be displayed. The experimental results show that the proposed method has an excellent reproduction effect. Moreover, the feasibility and unique advantages of the proposed method in the holographic augmented-reality display, zoom display and multiplane display have been proved. We believe that this method can promote the application of the holographic display.

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“…Color head-mounted holographic displays that employ LED illumination has been developed to overcome the common vergence-accommodation conflict in 3D Head Mounted Displays [19,20]. A new multiplexing method and a calibration technique for correcting the misaligned wavefronts due to multiplexing in color HDs has been studied [21,22]. The influence of spatial and temporal coherence on digital holographic reconstructions has been studied [23,24].…”

Section: Introductionmentioning

confidence: 99%

Effect of spatial coherence of LED sources on image resolution in holographic displays

et al. 2017

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Holographic Displays (HDs) provide 3D images with all natural depth cues via computer generated holograms (CGHs) implemented on spatial light modulators (SLMs). HDs are coherent light processing systems based on interference and diffraction, thus they generally use laser light. However, laser sources are relatively expensive, available only at some particular wavelengths and difficult to miniaturize. In addition, highly coherent nature of laser light makes some undesired visual effects quite evident, such as speckle noise, interference due to stray light or defects of optical components. On the other hand, LED sources are available in variety of wavelengths, has small die size, and no speckle artifact. However, their finite spatial size introduce some degree of spatial incoherence in an HD system and degrade image resolution, which is the subject of the study in this paper. Our theoretical analysis indicates that the amount of resolution loss depends on the distance between hologram and SLM image planes. For some special configurations, the source size has no effect at all. We also performed experiments with different configurations using lasers and LEDs with different emission areas that vary from 50 µm to 200 µm, and determined Contrast Transfer Function (CTF) curves which agree well with our theoretical model. The results show that it is possible to find configurations where LEDs combined with pinholes almost preserve natural resolution limit of human eye while keeping the loss in light efficiency within tolerable limits.

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Color holographic display with white light LED source and single phase only SLM

Cited by 105 publications

References 34 publications

Light source optimization for partially coherent holographic displays with consideration of speckle contrast, resolution, and depth of field

Light source optimization for partially coherent holographic displays with consideration of speckle contrast, resolution, and depth of field

Method of Speckle Noise Suppression for Holographic Zoom Display Based on Layered-Pixel-Scanning Algorithm

Effect of spatial coherence of LED sources on image resolution in holographic displays

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