Viewing angle enlargement in holographic 3D display by spatial light modulators tiling in curved configuration

2015 ◽  
Vol 8 (2) ◽  
pp. 227-233
Author(s):  
曾震湘 ZENG Zhen-xiang ◽  
郑华东 ZHENG Hua-dong ◽  
卢小仟 LU Xiao-qian ◽  
高洪跃 GAO Hong-yue ◽  
于瀛洁 YU Ying-jie
Keyword(s):  
Spatial Light Modulators ◽  
Viewing Angle ◽  
3D Display ◽  
Light Modulators

scholarly journals Holographic Near-Eye 3D Display Method Based on Large-Size Hologram

2021 ◽  
Vol 8 ◽  
Author(s):  
Su-Juan Liu ◽  
Ning-Tao Ma ◽  
Ping-Ping Li ◽  
Di Wang
Keyword(s):  
Incident Angle ◽  
Linear Structure ◽  
Reconstructed Image ◽  
Spatial Light Modulators ◽  
Image Point ◽  
Viewing Angle ◽  
3D Display ◽  
Light Modulators ◽  
Large Size ◽  
Tiling System

In this paper, we propose a holographic near-eye 3D display method based on large-size computer-generated hologram (CGH). The reconstructed image with a large viewing angle is obtained by using a time multiplexing and spatial tiling system. The large-size CGHs are generated and they record the information of the 3D object from different angles. The CGHs are reproduced at different moments. For a certain reconstructed moment, three spatial light modulators (SLMs) spatially spliced into a linear structure are used to load a single CGH. The diffraction boundary angle of the reconstructed light forming each image point is equal to the maximum diffraction angle of the SLM, so the viewing angle of the image generated by the CGH is enlarged. For different CGHs, the incident angle of reconstructed light is changed. Through time multiplexing, the reconstructed images of the CGHs are combined into a reconstructed image whose viewing angle is further enlarged. Due to the large viewing angle of the reconstructed image, the proposed method has unique advantages in near-eye display. The feasibility of the proposed method is proved by experimental results.

scholarly journals Holographic Three-Dimensional Virtual Reality and Augmented Reality Display Based on 4K-Spatial Light Modulators

2019 ◽  
Vol 9 (6) ◽  
pp. 1182 ◽  
Author(s):  
Hongyue Gao ◽  
Fan Xu ◽  
Jicheng Liu ◽  
Zehang Dai ◽  
Wen Zhou ◽  
...  
Keyword(s):  
Virtual Reality ◽  
Augmented Reality ◽  
Three Dimensional ◽  
Spatial Light Modulators ◽  
Viewing Angle ◽  
3D Display ◽  
Head Mounted Display ◽  
Light Modulators ◽  
3D Displays ◽  
Potential Applications

In this paper, we propose a holographic three-dimensional (3D) head-mounted display based on 4K-spatial light modulators (SLMs). This work is to overcome the limitation of stereoscopic 3D virtual reality and augmented reality head-mounted display. We build and compare two systems using 2K and 4K SLMs with pixel pitches 8.1 μm and 3.74 μm, respectively. One is a monocular system for each eye, and the other is a binocular system using two tiled SLMs for two eyes. The viewing angle of the holographic head-mounted 3D display is enlarged from 3.8 ∘ to 16.4 ∘ by SLM tiling, which demonstrates potential applications of true 3D displays in virtual reality and augmented reality.

scholarly journals Holographic Display System to Suppress Speckle Noise Based on Beam Shaping

Photonics ◽  
2021 ◽  
Vol 8 (6) ◽  
pp. 204
Author(s):  
Di Wang ◽  
Yi-Wei Zheng ◽  
Nan-Nan Li ◽  
Qiong-Hua Wang
Keyword(s):  
Optical Element ◽  
Speckle Noise ◽  
Beam Shaping ◽  
Diffractive Optical Element ◽  
The Other ◽  
Spatial Light Modulators ◽  
Viewing Angle ◽  
Display System ◽  
Holographic Display ◽  
Light Modulators

In this paper, a holographic system to suppress the speckle noise is proposed. Two spatial light modulators (SLMs) are used in the system, one of which is used for beam shaping, and the other is used for reproducing the image. By calculating the effective viewing angle of the reconstructed image, the effective hologram and the effective region of the SLM are calculated accordingly. Then, the size of the diffractive optical element (DOE) is calculated accordingly. The dynamic DOEs and effective hologram are loaded on the effective regions of the two SLMs, respectively, while the wasted areas of the two SLMs are performed with zero-padded operations. When the laser passes through the first SLM, the light can be modulated by the effective DOEs. When the modulated beam illuminates the second SLM which is loaded with the effective hologram, the image is reconstructed with better quality and lower speckle noise. Moreover, the calculation time of the hologram is reduced. Experiments indicate the validity of the proposed system.

scholarly journals Wide viewing angle dynamic holographic stereogram with a curved array of spatial light modulators

2008 ◽  
Vol 16 (16) ◽  
pp. 12372 ◽  
Author(s):  
Joonku Hahn ◽  
Hwi Kim ◽  
Yongjun Lim ◽  
Gilbae Park ◽  
Byoungho Lee
Keyword(s):  
Spatial Light Modulators ◽  
Viewing Angle ◽  
Light Modulators ◽  
Wide Viewing Angle ◽  
Holographic Stereogram

OPTICALLY ADDRESSED SPATIAL LIGHT MODULATORS FOR 3D DISPLAY

2011 ◽  
Vol 20 (04) ◽  
pp. 453-457 ◽  
Author(s):  
N. COLLINGS
Keyword(s):  
Neural Networks ◽  
Adaptive Optics ◽  
Spatial Light Modulator ◽  
Spatial Light Modulators ◽  
Current Interest ◽  
3D Display ◽  
Light Modulator ◽  
Optical Correlation ◽  
Light Modulators ◽  
Optical Neural Networks

An optically addressed spatial light modulator (OASLM) records the image on a write beam and transfers it to a read beam. Some example application areas are: image transduction; optical correlation; adaptive optics; and optical neural networks. Current interest in OASLMs has been generated by the work of Qinetiq on 3D display. This work is based on Active tiling, where an image can be recorded in one part of the device and is memorised, whilst the remainder of the device is updated with images. This paper will explain this system and survey the technological alternatives for this application.

Giant Anisotropy of Conductivity in Hydrogenated Nanocrystalline Silicon Thin Films

1998 ◽  
Vol 536 ◽  
Author(s):  
A. B. Pevtsov ◽  
N. A. Feoktistov ◽  
V. G. Golubev
Keyword(s):  
Thin Films ◽  
Film Thickness ◽  
Percolation Theory ◽  
Nanocrystalline Silicon ◽  
Spatial Light Modulators ◽  
Light Emitting ◽  
Light Modulators ◽  
Silicon Thin Films ◽  
Longitudinal Conductivity ◽  
Transverse Conductivity

AbstractThin (<1000 Å) hydrogenated nanocrystalline silicon films are widely used in solar cells, light emitting diodes, and spatial light modulators. In this work the conductivity of doped and undoped amorphous-nanocrystalline silicon thin films is studied as a function of film thickness: a giant anisotropy of conductivity is established. The longitudinal conductivity decreases dramatically (by a factor of 109 − 1010) as the layer thickness is reduced from 1500 Å to 200 Å, while the transverse conductivity remains close to that of a doped a- Si:H. The data obtained are interpreted in terms of the percolation theory.

scholarly journals Ag-Yb Alloy-Novel Tunable Plasmonic Material

Photonics ◽  
2021 ◽  
Vol 8 (7) ◽  
pp. 288
Author(s):  
Suetying Ching ◽  
Chakming Chan ◽  
Jack Ng ◽  
Kokwai Cheah
Keyword(s):  
Beam Steering ◽  
Volume Ratio ◽  
Response Strength ◽  
Transmission Efficiency ◽  
Spatial Light Modulators ◽  
Alloy Thin Film ◽  
Ellipsometric Measurement ◽  
Plasmonic Material ◽  
Light Modulators ◽  
Surface Plasmon Coupling

Metals are commonly used in plasmonic devices because of their strong plasmonic property. However, such properties are not easily tuned. For applications such as spatial light modulators and beam steering, tunable plasmonic properties are essential, and neither metals nor other plasmonic materials possess truly tunable plasmonic properties. In this work, we show that the silver alloy silver–ytterbium (Ag-Yb) possesses tunable plasmonic properties; its plasmonic response strength can be adjusted as a function of Yb concentration. Such tunability can be explained in terms of the influence of Yb on bound charge and interaction of its dielectric with the dielectric of Ag. The change in transition characteristics progressively weakens Ag’s plasmonic properties. With a spectral ellipsometric measurement, it was shown that the Ag-Yb alloy thin film retains the properties of Ag with high transmission efficiency. The weakened surface plasmon coupling strength without dramatic change in the coupling wavelengths implies that the tunability of the Ag-Yb alloy is related to its volume ratio. The principle mechanism of the plasmonic change is theoretically explained using a model. This work points to a potential new type of tunable plasmonic material.

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