Browsing by Author "Su, Wei-Chia"

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A Hybrid Display with 2D/3D Image Based on Static Hologram and LCD Panel
(2017-01-01)
Lin, Wen-Kai
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Liu, Wai-Tin
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Lin, Bor-Shyh
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Su, Wei-Chia
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光電學院
In this paper, a hybrid display which can provide 2D and 3D images was practice based on waveguide hologram. The hologram element recorded different 3D images and display different image without crosstalk.
A Study of Floating Image System with the Interaction Function
(2017-01-01)
Lin, Wen-Kai
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Chiu, Chien-Chang
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Lin, Bor-Shyh
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Su, Wei-Chia
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Hsiao, Fu-Li
In this study, a Fresnel lens, a half-reflecting mirror and a LCD were used to build up a see-through floating image system. A gesture recognition module was employed to achieve the human-computer interaction function. The designed system, offers a simple and economic architecture for augmented reality (AR) system.
Astigmatism and deformation correction for a holographic head-mounted display with a wedge-shaped holographic waveguide
(2018-09-01)
Lin, Wen-Kai
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Matoba, Osamu
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Lin, Bor-Shyh
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Su, Wei-Chia
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光電學院
In this study, a head-mounted display (HMD) system based on a wedge-shaped holographic waveguide that can present holographic virtual images with tunable distance is achieved. The compact computer-generated-hologram system using a spatial light modulator was employed to offer the dynamic image, where the probe beam for the hologram reconstruction is a convergent wave, and the DC term of the diffraction wave can be blocked by a barrier. The wedge-shaped holographic waveguide element was used as the combiner of the HMD system to generate a compact structure. A wedge with a polished surface was designed for in-coupling the image into the waveguide, and a reflection-type holographic optical element (HOE) was used for out-coupling the image from the waveguide. The astigmatism aberration and deformation of the diffraction images at various distances are analyzed and then are compensated. Finally, the virtual image can be obtained without aberration with experimental verification. (C) 2018 Optical Society of America
Astigmatism correction and quality optimization of computer-generated holograms for holographic waveguide displays
(2020-02-17)
Lin, Wen-Kai
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Matoba, Osamu
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Lin, Bor-Shyh
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Su, Wei-Chia
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光電學院
In this manuscript, the astigmatism of the waveguide combiner with a pair of symmetry HOEs was analyzed. The light field can be predicted by the modified convolution formulation of Fresnel diffraction when the information of light passes through the astigmatism causing element. Then the astigmatism can be corrected. The theory was experimentally proved by the system with a phase-only SLM and a diffraction planar waveguide. Furthermore, the image quality of astigmatism corrected phase-type CGHs can be improved via the iteration process. Since the coherence of light source was employed, the temporal averaging method was utilized to avoid speckle noise. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
Full Color Image Splitter Based on Holographic Optical Elements for Stereogram Application
(2013-08-01)
Deng, Qing-Long
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Su, Wei-Chia
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Chen, Chien-Yue
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Lin, Bor-Shyh
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Ho, Hsin-Wei
A color holographic beam splitter (CHBS) applied to an autostereoscopic display is proposed in this study. With high-stability polymer-dispersed-liquid-crystals (PDLC) being the holographic materials, holographic grating is utilized as a full-color beam splitter to split left and right field of views (FOVs) of a stereoscopic display. When CHBS is attached, the experimental results show that the correct left/right FOVs images could be successfully obtained at the preset observing distance of 25 cm. Moreover, the diffraction efficiency of the red, green and blue (RGB) left/right FOVs of the PDLC materials remained at 30.0% on average. Apparently, the brightness efficiency of the proposed CHBS stereo-displays is better than the traditional stereo-displays with a parallax barrier (22.4%). In addition, a crosstalk contrast with 95.0% indicates the crosstalk problem is almost avoided in the proposed technique.
Reduction of speckles and distortion in projection system by using a rotating diffuser
(2012-11-01)
Chen, Chien-Yue
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Su, Wei-Chia
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Lin, Ching-Huang
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Ke, Ming-De
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Deng, Qing-Long
A head up display (HUD) with laser backlight unit has two principle problems; one is laser speckles and the other is distortion. In this study, we propose that a rotating diffuser set at the intermediate image plane of the HUD projection system can simultaneously solve these problems. The conditions of speckle reduction and de-distortion are also estimated in this paper.
Security optical data storage in Fourier holograms
(2012-03-20)
Su, Wei-Chia
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Chen, Yu-Wen
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Chen, Yu-Jen
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Lin, Shiuan-Huei
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Wang, Li-Karn
We have proposed and demonstrated a holographic security storage system that is implemented with a shift multiplexing technique. The security function of this storage system is achieved by using a micro-diffuser (MD) for random phase encoding of the reference beams. The apparatus of random phase encoding in this system offers an additional and flexible function during the recording processes. The system can generate holographic security memory or nonsecurity holographic memory via using the MD or not. The storage capacity and the average signal-to-noise value of the security storage system are 16 bits/mu m(2) and 3.5, respectively. Lateral shifting selectivity in this holographic security storage system is theoretically analyzed and experimentally investigated. (C) 2012 Optical Society of America
Three-dimensional/two-dimensional convertible display based on computer-generated holograms and an amplitude-modulated spatial light modulator
(2018-06-01)
Matoba, Osamu
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Lin, Wen-Kai
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Hsiao, Fu-Li
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Huang, Chi-Yen
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Lin, Bor-Shyh
A three-dimensional/two-dimensional (3-D/2-D) convertible display was proposed. The display system offers 2-D images via the traditional display technology and offers 3-D images via the computer-generated hologram (CGH) technology. In this system, 2-D and 3-D images are generated from the same amplitude-modulated spatial light modulator (SLM). In the 2-D display mode, the panel displays an amplitude-modulated image and the 2-D image is projected on a polarization-dependent diffuser (PD) screen. In the 3-D display mode, the SLM panel displays CGHs to generate 3-D images. The zero-order diffraction of the amplitude-type CGH will be blocked by a spatial filter (SF), which is designed by a polarizer. Furthermore, a liquid crystal element was employed to modulate the polarization state of the reconstructed light to let the 3-D image quality not to be reduced by the PD. Finally, the proposed system can offer 2-D and 3-D images both clearly. The system suppresses the zero-order diffraction noise of the amplitude-type CGH system successfully. (C) 2018 Society of Photo-Optical Instrumentation Engineers (SPIE)
Wavelength-multiplex and space-multiplex holographic storage device
(2010-03-25)
Su, Wei-Chia
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Chen, Yeh-Hung
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Chung, Te-Yuan
The present invention discloses a wavelength-multiplex and space-multiplex holographic storage device, which comprises a storage medium, a plurality of signal light beams and at least one reference light beam. The signal light beams have different wavelengths and illuminate the storage medium. The reference light beam illuminates the storage medium and interferes with the signal light beams to form a plurality of interference patterns. The interference patterns are respectively stored on different-depth storage layers of the storage medium. The present invention not only has a high access rate but also has a large storage capacity.