Browsing by Author "Chen, Chih-Wei"

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2-D/3-D switchable autostereoscopic display with multi-electrically driven liquid-crystal (MeD-LC) lenses
(2010-09-01)
Huang, Yi-Pai
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Liao, Lin-Yao
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Chen, Chih-Wei
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光電工程學系
;
顯示科技研究所
A cylindrical multi-electrically driven liquid-crystal lens (MeD-LC lens) is proposed to extend the range of focusing. The MeD-LC lens could be applied to switching 2-D and 3-D images by supplying a specific operating voltage on each electrode. Therefore, the MeD-LC lens has less cross-talk than that of a conventional LC lens. Furthermore, the simplified structure of a MeD-LC lens with a homogeneous LC layer is much easier for fabrication without a LC-alignment issue.
Analysis of the depth of field of integral imaging displays based on wave optics
(2013-12-16)
Luo, Cheng-Gao
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Xiao, Xiao
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Martinez-Corral, Manuel
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Chen, Chih-Wei
;
Javidi, Bahram
In this paper, we analyze the depth of field (DOF) of integral imaging displays based on wave optics. With considering the diffraction effect, we analyze the intensity distribution of light with multiple microlenses and derive a DOF calculation formula for integral imaging display system. We study the variations of DOF values with different system parameters. Experimental results are provided to verify the accuracy of the theoretical analysis. The analyses and experimental results presented in this paper could be beneficial for better understanding and designing of integral imaging displays. (C) 2013 Optical Society of America
Cylindrical Liquid Crystal Lenses System for Autostereoscopic 2D/3D Display
(2012)
Chen, Chih-Wei
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Huang, Yi-Pai
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Chang, Yu-Cheng
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Wang, Po-Hao
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Chen, Po-Chuan
The liquid crystal lenses system, which could be electrically controlled easily for autostereoscopic 2D/3D switchable display was proposed. The High-Resistance liquid crystal (HRLC) lens utilized less controlled electrodes and coated a high-resistance layer between the controlled-electrodes was proposed and was used in this paper. Compare with the traditional LC lens, the HR-LC Lens could provide smooth electric-potential distribution within the LC layer under driving status. Hence, the proposed HR-LC Lens had less circuit complexity, low driving voltage, and good optical performance also could be obtained. In addition, combining with the proposed driving method called dual-directional overdriving method, the above method could reduce the switching time by applying large voltage onto cell. Consequently, the total switching time could be further reduced to around 2second. It is believed that the LC lens system has high potential in the future.
Deassociate the initial temporal phase deviation provided by photoelastic modulator for stroboscopic illumination polarization modulated ellipsometry
(2011-03-01)
Tsai, Hsiu-Ming
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Chen, Chih-Wei
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Tsai, Tsung-Han
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Chao, Yu-Faye
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光電工程學系
In addition to operating the imaging ellipsometric measurements by four-specific temporal phases in the photoelastic modulated ellipsometry, we added the fifth one to solve the initial phase of the photoelastic modulator. This methodology has been developed to conquer the slow imaging processing of charge-coupled device camera for the stroboscopic illumination in the polarization modulated imaging ellipsometry. Without any calibration in its initial phase, we can perform the ellipsometric measurement by the measurements of intensity at five-specific temporal phases. The intensities of a full cycle for a point on SiO(2)/Si thin film were measured and analyzed for verifying this algorithm. The five stroboscopic illuminations were performed to measure the two-dimensional distribution of the same SiO(2)/Si thin film. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3568745]
Dual Direction Overdriving Method for Accelerating 2D/3D Switching Time of Liquid Crystal Lens on Auto-Stereoscopic Display
(2012-10-01)
Chen, Chih-Wei
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Huang, Yi-Pai
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Chen, Po-Chuan
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光電工程學系
;
Department of Photonics
In this paper, we investigate the dual direction overdriving method to accelerate both the 3D-on and 3D-off time of the lenticular liquid crystal (LC) lens. The experimental results indicated that the response time (tau(3D-on) and tau(3D-off)) was successfully improved for a factor of 4 as a thick (60 mu m cell gap) LC lens. The LC lens was also implemented on an auto-stereoscopic display to yield fast 2D/3D switching ability.
Fast MPRT with High Brightness LCD by 120Hz Local Blinking HDR Systems
(2009)
Liao, Lin-Yao
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Chen, Chih-Wei
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Huang, Yi-Pai
;
Yeh, Szu-Che
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光電工程學系
A 120Hz Local Blinking HDR system was proposed to significantly reduce MPRT down to 3.89ms and keep high brightness almost as well as conventional LCDs, that is distinct from the prior arts, such as Black Band Insertion, Blinking Backlight and Gray Frame Insertion (GFI), those may cause brightness decrement. Furthermore, the intrinsic benefit of high dynamic range (high contrast) and low power consumption also can be achieved.
Fast Response Fresnel Liquid Crystal Lens for 2D/3D Autostereoscopic Display
(2011)
Huang, Yi-Pai
;
Chen, Chih-Wei
;
Huang, Yi-Ching
;
顯示科技研究所
;
Institute of Display
The fast response Fresnel liquid crystal lens with multiple electrodes structure had been proposed and optimized. The multi electrodes in the new Fresnel LC lens were placed at both inner surfaces of LC cell. By supplying specific operating voltages on each electrode, the optimized Fresnel LC lens was closed to the ideal Fresnel lens. The experiment results indicated that the Fresnel LC lens not only performed fast switching rate without over-drive method, but also had the advantage of low operating voltage. Furthermore, by using overdriving method, the response time could be further reduced but just need 15volts in a short time. It meant that a fast switching between 2D and 3D image display could be obtained by switching Fresnel LC lens on and off. In the end, the fast switching display was also demonstrated.
Improved Viewing Zones for Projection Type Integral Imaging 3D Display Using Adaptive Liquid Crystal Prism Array
(2014-03-01)
Chen, Chih-Wei
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Cho, Myungjin
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Huang, Yi-Pai
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Javidi, Bahram
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光電工程學系
In this paper, we present a novel projection-type 3-D integral imaging display with an adaptive liquid crystal (LC) prism array. Comparing with conventional integral imaging display, the proposed system demonstrated that the viewing zones for a projection type integral imaging display was successfully extended by time-multiplexed technique and without any mechanical movement. To the best of our knowledge, this is the first report on combining an adaptive LC prism array with the projection-type integral imaging 3-D display. The proposed display is attractive for future wide viewing zone projection-type integral imaging 3-D displays.
Invited Paper: High Resolution Autostereoscopic 3D Display with Scanning Multi-Electrode Driving Liquid Crystal (MeD-LC) Lens
(2009)
Huang, Yi-Pai
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Chen, Chih-Wei
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Shen, To-Chiang
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顯示科技研究所
;
Institute of Display
An autostereoscopic display with fill resolution of 2D and 3D images with wide viewing angle potential was proposed by combining an "active scanning film" and fast response OLED. In order to realize the active scanning film to project the images to different directions sequentially, Multi-Electrode Driving Liquid Crystal (MeD-LC) Lens was utilized. Comparing with traditional LC lens structures. MeD-LC lens could not only be switched on/off, but also horizontally moved to "scan" and project images. Additionally, MeD-LC lens was more competitive in respect of structure simplicity and various curvature generations.
Junctionless gate-all-around nanowire field-effect transistors with an extended gate in biomolecule detection
(2019-02-01)
Chen, Chih-Wei
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Lin, Ru-Zheng
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Chiang, Li-Chuan
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Pan, Fu-Ming
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Sheu, Jeng-Tzong
In this study, we investigated the potential drift and sensitivity in an extended-gate (EG) field-effect-transistor (FET)-based potentiometric sensor with junctionless (JL) and inversion-mode (IM) gate-all-around (GAA) nanowire (NW) FETs. An EG electrode (EGE) coated with Al2O3 via plasmaenhanced atomic-layer deposition exhibited high stability. Both JL and IM GAA NWFETs were prepared in the same batch and exhibited high electrical performance, including a steep subthreshold swing of approximately 63 mV dec(-1) and a high ON/OFF current ratio of approximately 3 x 10(7) at V-DS = 0.1 V. However, JL GAA NWFETs exhibited higher drift stability than did IM GAA NWFETs under various working regions over a long period of operation. Furthermore, JL GAA NWFETs with EGEs (JL GAA NWFETs w-EGEs) exhibited the highest sensitivity when operating under the subthreshold region in pH sensing (Delta I/I-0 = similar to 4410%). The readout sensitivity reached S-out = 82%. A JL GAA NWFET w-EGE was also demonstrated as a potentiometric biosensor for streptavidin real-time detection at concentrations of 42 fM to 4.2 nM. (C) 2019 The Japan Society of Applied Physics
Liquid Crystal Lens for Axially Distributed Three-Dimensional Sensing
(2013)
Huang, Yi-Pai
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Chen, Chih-Wei
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Cho, Myungjin
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Javidi, Bahram
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光電工程學系
In this paper, we present a novel three-dimensional (3D) sensing system which can demonstrate 3D acquisition. The proposed system is using an electronically tunable liquid crystal (LC) lens with axially distributed sensing method. Therefore, multiple 2D images with slightly different perspectives by varying the focal lengths of the LC lens without mechanical movements of an image sensor can be recorded. And then the 3D images are further reconstructed according to the ray-back projection algorithm. The preliminary functionalities are also demonstrated in this paper. We believe that our proposed system may useful for a compact 3D sensing camera system
Local Blinking HDR LCD Systems for Fast MPRT With High Brightness LCDs
(2010-05-01)
Liao, Lin-Yao
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Chen, Chih-Wei
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Huang, Yi-Pai
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光電工程學系
;
Department of Photonics
A new impulse-type display named Local Blinking High Dynamic Range (HDR) LCD System was proposed, which utilized local dimming technology to achieve a local blinking effect that not only suppressed motion blur and reduce Moving Picture Response Time (MPRT) to 3.89 ms but also applied local image compensation to maintain image brightness and details without substituting high power light source. In addition, the intrinsic advantages, such as high dynamic range (high contrast ratio) and low power consumption were also achieved.
Medical displays by using plasma-beam-alignment technology
(2008-01-01)
Lee, Chin-Yang
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Liu, Chi-Hung
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Chen, Chih-Wei
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Miki, Saodo
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Chen, Huang-Ming Philip
Novel anode layer plasma within minimum chamber space was developed for non-contact alignment process. The plasma-treated polyimide (PI) surface showed no particle contamination and no micro-scratches. Surface morphology was investigated by using scanning electron microscope (SEM), an atomic force microscope (AFM), and X-ray photoemission spectroscopy. The different oxygen-to-carbon ratio ([O]/[C] ratio) for XPS spectra indicated a composition change after plasma treatment. Surface pretilt angles were varied from 0 to 2.1 degrees under different plasma exposure times. Finally, a prototype 20.8-in. QXGA IPS-mode gray-scale medical liquid-crystal display was successfully demonstrated with high contrast ratio, excellent uniformity, and wide viewing angle using this new plasma-beam-alignment technique.
Optimization of Nanobelt Field Effect Transistor with a Capacitive Extended Gate for Use as a Biosensor
(2018-01-01)
Chen, Chih-Wei
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Yip, Bak-Sau
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Pan, Fu-Ming
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Sheu, Jeng-Tzong
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交大名義發表
In this study, various types of extended gate field effect transistor (EGFET) biosensors were compared and then a model based on potential coupling between a disposable extended gate (EG) capacitor and the gate-source/drain capacitor of a nanobelt field effect transistor (NBFET) was developed and optimized for biosensor applications. Several parameters, including the dielectric thicknesses and the EG gate area coverage, the ionic strength of buffer solution, and the charge density of specific binding biomolecules, were included in the model. The potential coupling efficiency between the potential induced by surface charge on the EG and the gate voltage of the FET was analyzed and verified through pH detection. Biotin-streptavidin/avidin sensing was demonstrated with the optimized EG and NBFET. In addition, real-time measurements of the detection of botulinum neural toxin (BoNT) type-A were also performed using the EG NBFET, which could detect an extremely low concentration (20 fM) of BoNT type-A. Because the nanoelectronic field effect transistor does not need to be sacrificed after detection, the optimized EG NBFET biosensor has great potential for use in bio/chemical and point-of-care applications. (C) The Author(s) 2018. Published by ECS.
Superzone Fresnel Liquid Crystal Lens for Temporal Scanning Auto-Stereoscopic Display
(2012-11-01)
Huang, Yi-Pai
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Chen, Chih-Wei
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Huang, Yi-Ching
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光電工程學系
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Department of Photonics
The fast response superzone Fresnel liquid crystal (LC) lens with multiple transparent electrodes was proposed for temporal scanning auto-stereoscopic display. The experimental results indicated that the superzone Fresnel LC lens not only performed fast switching time (similar to 0.2 s), but also had the benefit of low driving voltage (similar to 5 V-rms). A 4-inch 2D/3D switchable auto-stereoscopic display with superzone Fresnel LC lens was further demonstrated. Finally, by driving the multiple electrodes alternatively, the superzone Fresnel LC lens array could be moved on horizontal direction for increasing the resolution of auto-stereoscopic display.
THREE DIMENSIONAL DISPLAY
(2010-12-02)
Huang, Yi-Pai
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Chen, Chih-Wei
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Shen, To-Chiang
A three dimensional display includes a display panel and a view-scanning layer. The display panel is used to display many display images quickly. The view-scanning layer is disposed on the display panel and receives the display images. The view-scanning layer has many light refracting modulation regions. Each of the light refracting modulation regions includes a view-scanning unit. The view-scanning unit changes an ongoing direction of a light according to an applied electric field so as to project a part of each of the display images at different view directions. Here, each of the view directions corresponds to the ongoing direction of the light.
Three-dimensional imaging with axially distributed sensing using electronically controlled liquid crystal lens
(2012-10-01)
Chen, Chih-Wei
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Cho, Myungjin
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Huang, Yi-Pai
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Javidi, Bahram
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土木工程學系
In this Letter, we present a three-dimensional (3D) imaging system with axially distributed sensing (ADS) using an electronically controlled liquid crystal (LC) lens. The proposed system performed an optical image acquisition by varying the focal lengths of the LC lens without mechanical movements of an image sensor. Multiple images with slightly different perspectives were experimentally recorded, and the 3D images were reconstructed according to the ray backprojection algorithm. To the best of our knowledge, this is the first report on 3D ADS using a LC lens. The proposed system is attractive for compact 3D sensing camera systems. (C) 2012 Optical Society of America