RGB imaging volumes alignment method for color holographic displays

Zaperty, Weronika; Kozacki, Tomasz; Gierwiało, Radosław; Kujawińska, Małgorzata

doi:10.1117/12.2249197

Cited by 3 publications

(3 citation statements)

References 29 publications

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“…The cell gap refers to the thickness of the LC layer. The response time is proportional to d x , where x is related to the anchoring energy and d is the cell gap [23]. Assuming strong anchoring effects, the reflective LCoS could respond four times faster than the transmissive LC-SLM for the same phase retardation.…”

Section: Basic Principle Of Phase-only Slmmentioning

confidence: 99%

Progress in Phase Calibration for Liquid Crystal Spatial Light Modulators

Cao

2019

Applied Sciences

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Phase-only Spatial Light Modulator (SLM) is one of the most widely used devices for phase modulation. It has been successfully applied in the field with requirements of precision phase modulation such as holographic display, optical tweezers, lithography, etc. However, due to the limitations in the manufacturing process, the grayscale-phase response could be different for every single SLM device, even varying on sections of an SLM panel. A diverse array of calibration methods have been proposed and could be sorted into two categories: the interferometric phase calibration methods and the diffractive phase calibration methods. The principles of phase-only SLM are introduced. The main phase calibration methods are discussed and reviewed. The advantages of these methods are analyzed and compared. The potential methods for different applications are suggested.

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Section: Basic Principle Of Phase-only Slmmentioning

confidence: 99%

Progress in Phase Calibration for Liquid Crystal Spatial Light Modulators

Cao

2019

Applied Sciences

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“…In order to overcome the problem of color breakup and use the full achievable frame rate of the SLM, the spatial division [37,38] may be used instead of timedivision. It involves dividing the SLM into three separated regions illuminated by three beams with associated colors and known wavelengths [39].…”

Section: Color Holographic Projection By Spatial Divisionmentioning

confidence: 99%

Experimental Aspects of Holographic Projection with a Liquid-Crystal-on-Silicon Spatial Light Modulator

Makowski¹

2019

Holographic Materials and Applications

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Dynamic electroholography is a suitable and promising technology of image display for future projection and near-eye displays. Until a new phase modulation technology is introduced, practical research assumes the use of pixelated spatial light modulators based on liquid crystals with electronically controlled birefringence leading to a controllable refractive index. Such an approach allows for university grade development and testing of holographic computation methodology, but its limitations and drawbacks currently disable the massive application in consumer electronics. This chapter describes the differences between the behavior of the modulator as expected from Fourier optics and that observed in practical optical experiments. Moreover, practical hints and proven techniques of overcoming selected hardware issues of the chosen liquid-crystal-on-silicon (LCoS) phase modulators are given. The smart combination of the described techniques could allow more precise operation of spatial light modulators with a higher agreement with numerical simulations, especially for holographic projection of colorful images.

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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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RGB imaging volumes alignment method for color holographic displays

Cited by 3 publications

References 29 publications

Progress in Phase Calibration for Liquid Crystal Spatial Light Modulators

Progress in Phase Calibration for Liquid Crystal Spatial Light Modulators

Experimental Aspects of Holographic Projection with a Liquid-Crystal-on-Silicon Spatial Light Modulator

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

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