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Display Technology, Journal of

Issue 2 • Date Feb. 2014

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Displaying Results 1 - 21 of 21
  • Front Cover

    Publication Year: 2014 , Page(s): C1
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  • Journal of Display Technology publication information

    Publication Year: 2014 , Page(s): C2
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  • Table of contents

    Publication Year: 2014 , Page(s): 85 - 86
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  • MulDiRoH: A Multi-View Human Representation System Using a QDA Screen With Multiple Cameras

    Publication Year: 2014 , Page(s): 87 - 93
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2107 KB) |  | HTML iconHTML  

    In this paper, we have developed a human representation system we call “MulDiRoH.” It consists of a multiview display that uses a QDA screen and multiple cameras. The QDA screen has a large, wide viewing area that enables observers to comfortably watch the display. It is also convenient in that accurate projector orientation is unnecessary; this makes easy system construction possible. In this paper, we describe the MulDiRoH system and propose a “Tiled Image Method” to achieve shorter projection distance with it and a “Perspective Transform Method” to correct views obtained with it. View full abstract»

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  • Tolerance Evaluation for Defocused Images to Optical Watermarking Technique

    Publication Year: 2014 , Page(s): 94 - 100
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2246 KB) |  | HTML iconHTML  

    In this paper, we describe a new aspect to evaluating the robustness of the optical watermarking technique, which is a unique technology that can add watermarked information to object image data taken with digital cameras without any specific extra hardware architecture. However, since this technology uses light with embedded watermarked information, which is irradiated onto object images, the condition of taking a picture with digital cameras may affect the accuracy with which embedded watermarked data can be detected. Images taken with digital cameras are usually defocused, which occurs under non-optimal conditions. We evaluated the defocusing in images against the accuracy with which optical watermarking could be detected. Defocusing in images can be expressed with convolution with a line-spread function (LSF). We used the value of full-width at half-maximum (FWHM) of a Gaussian function as the degree to which images were defocused, which could approximate LSF. We carried out experiments where the accuracies of detection were evaluated as we varied the degree to which images were defocused. The results from the experiments revealed that optical watermarking technology was extremely robust against defocusing in images. View full abstract»

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  • Efficient Simulation Model for Amorphous In-Ga-Zn-O Thin-Film Transistors

    Publication Year: 2014 , Page(s): 101 - 106
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1027 KB) |  | HTML iconHTML  

    A computationally efficient simulation model for the drain current characteristics of long-channel amorphous In-Ga-Zn-O (a-IGZO) thin-film transistors (TFTs) is developed. This model uses numerical solutions of the one-dimensional Poisson equation to significantly reduce the calculation time compared to a widely used two-dimensional approach. Moreover, for accurate simulation, the model takes into account the influence of trap states in the band gap, which makes it possible to reproduce the gradual increase of the drain current in the subthreshold region. The model also includes both drift and diffusion components of the drain current and so can describe the drain current in all regions of device operation, i.e., the subthreshold, linear, and saturation regions, by using a unified current equation without introducing the threshold voltage as an input parameter. Calculations using the model provide results that are in good agreement with the measured drain current characteristics of a-IGZO TFTs over a wide range of gate and drain voltages. The presented model is expected to enable faster and accurate characteristic analysis and structure design for a-IGZO TFTs. View full abstract»

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  • Holographic Image Projection on Tilted Planes by Phase-Only Computer Generated Hologram Using Fractional Fourier Transformation

    Publication Year: 2014 , Page(s): 107 - 113
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1415 KB) |  | HTML iconHTML  

    We propose a new method to compute the phase-only computer-generated hologram (CGH) that can modulate an image on a tilted plane. We used the fractional Fourier transformation to compute light propagation between the hologram plane and the tilted plane. The phase-only hologram was obtained by an iterative algorithm. We proposed a method to calculate the inverse optical propagation from the hologram plane to a tilted plane by coordinate rotation and a simple interpolation in the Fourier domain. The experimental results show that the projected image on the tilted plane can be reconstructed by a phase-only hologram generated by our iterative algorithm. We also show that the quality of the projected image on the tilted plane is better than the image projected by the phase hologram generated by traditional method. View full abstract»

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  • Distant Binocular Filters for Full-Resolution Autostereoscopic Viewing and for Single-Aperture Stereo Glasses

    Publication Year: 2014 , Page(s): 114 - 119
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (909 KB) |  | HTML iconHTML  

    Various physical and technical restrictions prevent realization of the perfect autostereoscopic (glasses-free or naked-eye) displays. For example, autostereoscopic displays, providing freedom of movement of a viewer, have reduced spatial resolution of 3D image and usually do not compatible with 2D imaging. Autostereoscopic displays with full-screen spatial resolution, as a rule, do not provide the native (without use of tracking) freedom of movement of the viewer. Many advanced expensive autostereoscopic displays have complex optics and bulky packaging. This paper describes the concept of distant binocular filter (DBF) for full-screen resolution autostereoscopic viewing using off-the-shelf stereoscopic displays originally designed to use with stereo glasses (active or passive ones). The DBF has a single aperture with two adjacent (side-by-side) continuous viewing areas with complementary optical properties of work medium. Separation of two views is reached by placing the DBF at the certain distances from a face of the viewer and from a display screen. A single-aperture shutter for stereo glasses is described as a particular case of DBF. View full abstract»

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  • Polarizer Parallax Barrier 3D Display With High Brightness, Resolution and Low Crosstalk

    Publication Year: 2014 , Page(s): 120 - 124
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (905 KB) |  | HTML iconHTML  

    A polarizer parallax barrier 3D display with high brightness, resolution and low crosstalk is proposed in this paper. The 3D display includes a 2D display panel, a polarizer film array, and a polarizer parallax barrier. The 2D display panel and the polarizer film array provide two parallax images in orthogonal polarization directions. The polarizer parallax barrier is covered with striped polarizers. Parallax images are modulated by the polarizer parallax barrier, and 3D images are displayed. A prototype of the proposed 3D display is developed and it has higher brightness and resolution than the 3D display based on conventional parallax barriers. Using a particular algorithm for synthetic images, the crosstalk is limited in a low level. Experiments are carried out, and good results finally verify the feasibility of the proposed method. View full abstract»

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  • Storage Lifetime of Polymer-Carbon Nanotube Inks for Use as Charge Transport Layers in Organic Light Emitting Diodes

    Publication Year: 2014 , Page(s): 125 - 131
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (956 KB) |  | HTML iconHTML  

    The long-term stability of multiwall carbon nanotubes (MWCNTs) mixed with the hole-transport polymer Poly(3,4-ethylene dioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) has been examined. These surfactant stabilized solutions, used as transport layers in organic light-emitting diodes (OLEDs), are shown to be stable for periods of up to 15 months and show no signs of degrading soon after this time. In comparison, nonstabilized aqueous MWCNT solutions have been shown to aggregate within 30 min of production, and, although these aggregates can be redispersed, the solution displays an increase in smaller aggregates over time which cannot subsequently be redispersed by manual agitation. The stable MWCNT/PEDOT:PSS solutions have been used in ink-jet printing and as composite MWCNT/PEDOT:PSS films suitable as charge transport layers in spin-coated OLEDs. View full abstract»

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  • A4-Sized Parallel Phase-Shifting Digital Holography System

    Publication Year: 2014 , Page(s): 132 - 137
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2304 KB) |  | HTML iconHTML  

    An A4-sized parallel phase-shifting digital holography system was constructed and experimentally demonstrated. Parallel phase-shifting digital holography is a technique being capable of instantaneous recording of three-dimensional (3-D) image of moving object. Aiming at a 3-D motion picture measurement of moving object system that can be carried on sites where the measurement system is needed, we improved a previous portable parallel phase-shifting digital holography system. The size and weight of the improved portable system are 300 mm × 210 mm × 160 mm and 6 kg, respectively. Also, we experimentally recorded a series of holograms of a moving object and reconstructed motion pictures, which show the same event but are focused at each depth, from the holograms. Thus, the 3-D motion picture recording and reconstruction capability of the constructed system were successfully demonstrated. A 3-D motion picture at 10 frames/s was obtained by the system. View full abstract»

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  • Hardware Engine for Supporting Gray-Tone Paintbrush Function on Electrophoretic Papers

    Publication Year: 2014 , Page(s): 138 - 145
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1365 KB) |  | HTML iconHTML  

    The electrophoretic display (EPD) has been widely applied on electronic readers (E-Readers) for displaying image/text contents. With a touch panel, the user can put annotations on the contents at will. However, none of the available E-Readers support the function of paintbrush, which allows the user to plot gray tone figures. This is because the EPD is a bistable display whose driving method is quite complicated. In this paper, we first discuss the issues of realizing paintbrush function on the EPD display controller and then propose a new signal processing engine for the paintbrush function. The engine contains four stages: 1) screening the detected pixel coordinates; 2) interpolating pixels; 3) performing image halftoning to generate more visual gray levels; and 4) driving the pixels to the target states. The experimental results show that the engine meets the real-time requirement to complete the pixel interpolation as well as produce the gray-tone traces. View full abstract»

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  • Effect of Stair-Case Electron Blocking Layer on the Performance of Blue InGaN Based LEDs

    Publication Year: 2014 , Page(s): 146 - 150
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (670 KB) |  | HTML iconHTML  

    Staircase electron blocking layer (EBL) is incorporated in InGaN-based blue light-emitting diodes to numerically investigate the efficiency droop mechanism by using the APSYS simulation software. It is found that gradually reducing aluminum (Al) composition in the growth direction of the AlGaN staircase EBL can improve light output power, lower current leakage, and efficiency droop. To the contrary, increasing the Al composition in the staircase EBL along the growth direction will aggravate the electron leakage and efficiency droop. These distinct features are attributed mainly to discrepancy energy band tailoring in the EBL region, and finally different electron blocking efficiency. View full abstract»

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  • Laser Speckle Reduction Using a Motionless Despeckle Element Based on Random Mie Scattering

    Publication Year: 2014 , Page(s): 151 - 156
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1431 KB) |  | HTML iconHTML  

    A motionless despeckle element based on Mie scattering and Brownian motion of suspended particles is proposed, which is achieved by filling a light pipe with diluted milk in laser projection systems. The Brownian motion of the milk fat particles leads to the superposition of the intensity of the instantaneous scattered light within the integration time of the human eye, which causes a reduction in laser speckle contrast because of temporal averaging intensity. Experimental results show that the speckle contrast mainly depends on the concentration of the suspended fat particles, and can be reduced down to 3.94% at the fat particle concentration of approximately 7.0 ×10-4 μm-3. View full abstract»

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  • Blue Phase LC/Polymer Fresnel Lens Fabricated by Holographics

    Publication Year: 2014 , Page(s): 157 - 161
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (886 KB) |  | HTML iconHTML  

    A novel fabrication method using holographic exposure for switchable blue phase (BP) liquid crystal (LC)/polymer Fresnel lens was demonstrated. The Fresnel pattern can be achieved by interfering a planar and a spherical wave fronts with a 532-nm laser. The BPLC/polymer Fresnel lens can thus be fabricated without photo mask and controlled with a simpler driving compared with the conventional LC Fresnel lens. View full abstract»

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  • GaN-Based Light-Emitting Diodes With Staircase Electron Injector Structure

    Publication Year: 2014 , Page(s): 162 - 166
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (661 KB) |  | HTML iconHTML  

    The authors experimentally studied GaN-based light-emitting diodes (LEDs) with both an staircase electron injector (SEI) structure and a conventional electron blocking layer (EBL). With the EBL, it was found that we could enhance LED output power, reduce forward voltage, and mitigate efficiency droop by inserting the SEI structure. These improvements could all be attributed to the effective cooling of the injected hot electrons. However, it was also found that some of the injected electrons could still leak into the p-GaN layer in the LED with SEI structure but without the EBL. View full abstract»

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  • Blank page

    Publication Year: 2014 , Page(s): 167 - 168
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  • Open Access

    Publication Year: 2014 , Page(s): 169
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    Freely Available from IEEE
  • IEEE Xplore Digital Library

    Publication Year: 2014 , Page(s): 170
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  • Journal of Display Technology information for authors

    Publication Year: 2014 , Page(s): C3
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  • [Blank page - back cover]

    Publication Year: 2014 , Page(s): C4
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Aims & Scope

This publication covers the theory, design, fabrication, manufacturing and application of information displays and aspects of display technology.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Arokia Nathan
University of Cambridge
Cambridge, U.K.