Holographic Display System Research Articles

Three-Dimensional Holographic Display Using Dense Ray Sampling and Integral Imaging Capture

We present optical experimental results for a high-resolution three-dimensional (3D) holographic display system based on dense ray sampling and integral imaging capture. Holograms are generated based on re-sampling the rays from 2D images captured by an integral imaging system. In addition, we demonstrate a depth of field extension technique during the integral imaging capture by combining an amplitude modulated lens technique and a blind convolution approach. The optically reconstructed images of the holographic display system are shown and compared with conventional integral imaging-based holographic displays for different scenes.

Spatiotemporal multiplexing for holographic display with multiple planar aligned spatial-light-modulators.

A holographic display system combining the spatial- and time-multiplexing together in one system is proposed. The system is constructed by multiple planar aligned spatial-light-modulators (SLMs). A shiftable cylindrical lens is introduced in to build up an "equivalent SLM" by seamlessly linked horizontal images of the SLMs, which are tiled in a time-sequential manner. The proposed system can realize wide horizontal-viewing-angle holographic three-dimensional (3D) display through the "equivalent SLM", but bear with low requirements on the number and frame rate of SLMs, and the numerical aperture of the optical system. In the proposed system, only one parallel incident beam is needed, leading to a simplified optical structure. Using two 60Hz phase SLMs, a 3D display with a horizontal viewing angle (VA) of 27.5° is implemented experimentally.

Spatiotemporal multiplexing and streaming of hologram data for full-color holographic video display

We propose a new approach to spatiotemporally multiplex sub-holograms and stream hologram data in parallel by using multiple spatial light modulators (SLMs) to increase the spatiotemporal resolution of holographic display system. With the proposed approach, we have achieved a spatiotemporal resolution of 4.5 × 1010 pixel/s, as compared with 1.89 × 109 pixel/s of a single SLM. Each frame of computer-generated hologram video has a pixel count of 378 Mpixels and is divided into 288 sub-holograms, each of 1.31 Mpixels. During the playback of holographic video, these sub-holograms are spatiotemporally multiplexed and streamed in parallel to form the integrated hologram within 16.67 ms, which enables full-color holographic video display with a 10-in. diagonal at a hologram data frame rate of 60 frames per second (fps). New SLM devices with higher spatiotemporal resolution need to be developed in order to meet the data bandwidth requirement of about 1012–1014 pixel/s for future 3D holographic displays.

Digital Holographic Display System with Large Screen Based on Viewing Window Movement for 3D Video Service

A holographic display system with a 22-inch LCD panel is developed to provide a wide viewing angle and large holographic 3D image. It is realized by steering a narrow viewing window resulting from a very large pixel pitch compared to the wave length of the laser light. Point light sources and a lens array make it possible to arbitrarily control the position of the viewing window for a moving observer. The holographic display provides both eyes of the observer with a holographic 3D image using two vertically placed LCD panels and a beam splitter to support the holographic stereogram.

The holographic display of three-dimensional medical objects through the usage of a shiftable cylindrical lens

Through the creative usage of a shiftable cylindrical lens, a wide-view-angle holographic display system is developed for medical object display in real three-dimensional (3D) space based on a time-multiplexing method. The two-dimensional (2D) source images for all computer generated holograms (CGHs) needed by the display system are only one group of computerized tomography (CT) or magnetic resonance imaging (MRI) slices from the scanning device. Complicated 3D message reconstruction on the computer is not necessary. A pelvis is taken as the target medical object to demonstrate this method and the obtained horizontal viewing angle reaches 28°.

Real-time pupil tracking backlight system for holographic 3D display (Invited Paper)

We propose an automatic three-dimensional (3D) pupil tracking backlight system for holographic 3D display system with large image size and full-parallax accommodation effect. The proposed tracking module is applied to a holographic 3D display system with two sets of directional holographic imaging module composed of 2×2 large scale lens array and 22-inch high-resolution liquid crystal display 3D panel. System architecture is described and experimental results are presented.

Image encryption method for depth + texture video contents

This paper proposes a contents security technique for digital holographic display systems. A digital holographic display system assumes that it follows faithfully the current system frame in processes such as image acquisition, processing, transmission, reception and reconstruction to provide 2D or 3D video services. For the image acquisition in this system, RGB and depth cameras are used. An image contents encryption technique, which is executed in the digital holographic display system, is proposed. This technique encrypts only a part of data by performing the frequency transformation of depth-maps and RGB images. In this paper, two applications of the proposed encryption technique are discussed. In the first one, only depth-maps are encrypted and in the second one, depth-maps and RGB image information are encrypted simultaneously. The experiment results reveal that 0.73% of the entire data are encrypted and that the proposed technique can effectively hide the visual information of an original RGB image and depth-map.

A high‐efficiency holographic waveguide display system with a prism in‐coupler

AbstractHolographic waveguide display system with high efficiency is presented by embedding an in‐coupling prism and an out‐coupling reflective volume holographic element, which enables a small‐type configuration. The improved coupling scheme can achieve 25% efficiency and the chromatic is corrected properly.

Holographic display system for restoration of sight to the blind

Objective. We present a holographic near-the-eye display system enabling optical approaches for sight restoration to the blind, such as photovoltaic retinal prosthesis, optogenetic and other photoactivation techniques. We compare it with conventional liquid crystal displays (LCD) or digital light processing (DLP)-based displays in terms of image quality, field of view, optical efficiency and safety. Approach. We detail the optical configuration of the holographic display system and its characterization using a phase-only spatial light modulator. Main results. We describe approaches to controlling the zero diffraction order and speckle related issues in holographic display systems and assess the image quality of such systems. We show that holographic techniques offer significant advantages in terms of peak irradiance and power efficiency, and enable designs that are inherently safer than LCD or DLP-based systems. We demonstrate the performance of our holographic display system in the assessment of cortical response to alternating gratings projected onto the retinas of rats. Significance. We address the issues associated with the design of high brightness, near-the-eye display systems and propose solutions to the efficiency and safety challenges with an optical design which could be miniaturized and mounted onto goggles.

Interactive holographic three-dimensional display with a spatial mouse

Based on our previous work (Teng et al., Optics Communication 285, 4235, 2012, [7]), an interactive holographic three-dimensional display system is developed through separating the mirror-image's Fourier CGH of the target object from the planar mirror spatially. A fiber tip is introduced to indicate the spatial content of the displayed light field. Combining with a popup menu, interactive display is realized with the fiber tip as a spatial mouse. The complex amplitude of the zero-order beam caused by the pixelated phase-only spatial light modulator (SLM) is measured through the phase-shifting technology. A hologram which produces not only the functional light patterns but also a corrective beam will be generated to eliminate the zero-order beam through destructive interference. The proposed technology is demonstrated with a 60Hz SLM by introducing an observer tracking unit.

P.52: A Colorful Holographic Display System with Enlarged Viewing Zone Using Multiplex SLMs

AbstractA full‐color holographic display system with enlarged viewing zone by rotational half mirror is presented where the CGHs are divided into several areas to extend the viewing angle based on multiple intensity images with depth map. It can produce the 3D image with correct depth cue, effect of light and shadow.

Direct Optical Fringe Writing of Diffraction Specific Coherent Panoramagrams in Photorefractive Polymer for Updatable Three-Dimensional Holographic Display

Progress in the development of an updatable holographic display system based around the direct transfer of computer-generated holographic fringe patterns from LCoS SLMs into photorefractive polymeric materials is presented. This architecture is poised as a simplifying alternative to previous demonstrations of updatable holographic displays in photorefractive polymeric materials based around conventional interference-based holographic stereogram techniques. Our system concept – comprised of fringe pattern generation on computer, fringe pattern transfer from SLM to photorefractive polymer, and spatial multiplexing for large-image generation – reintroduces accommodation cues to the resulting holographic images and represents a reduction of system footprint, complexity, and cost relative to the current interference-based systems. We present the adaptation of our Diffraction Specific Coherent Panoramagram fringe computation method – originally developed to drive AOM-based holographic displays at video rates while preserving all depth cues, including accommodation – to the current display architecture and depict methods for direct fringe transfer from SLM to photorefractive polymer. Preliminary results of horizontal parallax-only images on this display are presented and directions for performance improvements and system extensions are explored.

基于棱镜光栅结构的全息波导头盔显示系统设计

基于棱镜光栅结构的全息波导头盔显示系统设计

Wide angle holographic display system with spatiotemporal multiplexing

This paper presents a wide angle holographic display system with extended viewing angle in both horizontal and vertical directions. The display is constructed from six spatial light modulators (SLM) arranged on a circle and an additional SLM used for spatiotemporal multiplexing and a viewing angle extension in two perpendicular directions. The additional SLM, that is synchronized with the SLMs on the circle is placed in the image space. This method increases effective space bandwidth product of display system data from 12.4 to 50 megapixels. The software solution based on three Nvidia graphic cards is developed and implemented in order to achieve fast and synchronized displaying. The experiments presented for both synthetic and real 3D data prove the possibility to view binocularly having good quality images reconstructed in full FoV of the display.

Holographic display system of a three-dimensional image with distortion-free magnification and zero-order elimination

We propose a three-dimensional (3-D) holographic display system which consists of a phase-only spatial light modulator (SLM) and a modified 4-f system. The 3-D scene is generated from OpenGL, and the point source algorithm with anti-aliasing technique is used to generate the Fresnel hologram. A modified 4-f system is proposed to produce distortion-free magnification of the 3-D image and eliminate the zero-order interruption of the 3-D holographic imaging system. This method can make efficient utilization of the space-bandwidth product of the SLM, which promises the image quality and keeps the 3-D imaging zone unchanged. Numerical simulations and optical experiments are performed, and the results show that our proposed method can reconstruct enlarged 3-D optical image with correct magnification factor and low image noise.

Analysis of Digital Hologram Rendering Using a Computational Method

To manufacture a real time digital holographic display system capable of being applied to next-generation television, it is important to rapidly generate a digital hologram. In this paper, we analyze digital hologram rendering based on a computer computation scheme. We analyze previous recursive methods to identify regularity between the depth-map image and the digital hologram.

하이브리드 영상획득 장치를 이용한 초다시점 영상 디스플레이 시스템

People have been interested in the next generation media and service over 3D by development of 3D industry and generalization of 3D-related content and equipment in recent year. Many researchers predict that a strong candidate is digital hologram. Holographic technology is classified to capture(or generation), processing, and display(or reconstruction). This paper discusses the digital holographic display system using hybrid image pickup system and proposes a new structure of digital holographic display system. Through the proposed method a digital hologram can be scalably serviced according to display equipments with various resolutions, computing power of decoding part, and network bandwidth.

Wide angle digital holographic interferometry with real-time optical reconstruction

In the paper we will discuss the wide angle capture and display systems applied for digital holographic interferometry (DHI). The static capture system is based on a single camera and an object located at a rotational stage. The holograms are captured sequentially in time during object loading and the phases at a hologram plane are calculated by phase shifting method. The dynamic capture system employs several cameras located around an object and simultaneous capture of several holograms is performed with the frequency of impulse laser applied. For both DHI capture systems the holographic display configuration is proposed. Multiple spatial light modulators aligned in circular configuration are put to work together. In the paper the main requirements for optical reconstruction of resultant interferograms originated from both capture systems are discussed. The results of experiments are presented and analysed. Full Text: PDF References T. Kreis, “ Handbook of holographi interferometry: Optical and digital methods”, Wiley-VCH Verlag GmbH, 2005. A. Michałkiewicz, Kujawińska M., Stasiewicz K., "Digital holographic cameras and data processing for remote monitoring and measurements of mechanical parts", Optoelectronics Review, v. 16, 68-75, 2008 CrossRef T. Kozacki, M. Kujawinska, G. Finke, B. Hennely, N. Pandey, "Extended viewing angle holographic display system with tilted SLMs in a circular configuration", Appl. Opt., 52, 1771-1780, 2012. CrossRef M. Kujawinska, T. Kozacki, Holographic Television: Status and Future, in Optical Imaging and Metrology: Selected Topics, 55-93, (eds W. Osten and N. Reingand), Wiley-VCH Verlag GmbH. Kelly D.P. et al., "Digital Holographic Capture and Optoelectronic Reconstruction for 3D Displays", Int. J. Digital Multimedia Broadcasting, 2010, Article ID 759323, 2010. CrossRef

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

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.

Holographic Capture and Display Systems in Circular Configurations

This paper presents a novel method of multi-spatial light modulator (SLM) holographic image display that enables wide angle reconstruction of images of real world objects. The image data are delivered by means of digital holography. The capture and display systems are arranged in a circular configuration. In order to support the proper information flow between the multi-sensor capture and multi-SLM display systems we perform analysis using the Wigner distribution function. We also consider a mismatch of the capture and display configurations as well as the visual perception of the displayed image. Experimental results based on the reconstruction of real world scenes are presented that demonstrate the validity of the theoretical solutions. A single camera is used to record the digital holograms, where the object is rotated between captures, and these holograms are then displayed on a circular configuration of SLMs. The results show the limitation of multi-SLM holographic displays in terms of visual perception. These problems arise from the limited angular distribution of the SLMs on a display circle and the presence of gaps between the SLMs.