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Display Technology, Journal of

Issue 5 • Date May 2011

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Displaying Results 1 - 22 of 22
  • [Front cover]

    Publication Year: 2011 , Page(s): C1
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  • Journal of Display Technology publication information

    Publication Year: 2011 , Page(s): C2
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  • Table of contents

    Publication Year: 2011 , Page(s): 221
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  • Blank page

    Publication Year: 2011 , Page(s): 222
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  • 3D Visualization of Partially Occluded Objects Using Axially Distributed Sensing

    Publication Year: 2011 , Page(s): 223 - 225
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (326 KB) |  | HTML iconHTML  

    We present experiments on 3D visualization of partially occluded objects using axially distributed sensing. The axially distributed sensing method provides collection of 3D information for a partially occluded object and the 3D images are visualized using the modified digital reconstruction algorithm based on inverse ray projection model. We apply this method to a camouflage setting where the object is partially occluded by a camouflage net. The optical experiments are performed to capture longitudinal elemental images of a partially camouflaged object and to visualize the 3D images with digital reconstruction. To the best of our knowledge, this is the first report to apply the axially distributed sensing method to visualizing occluded objects. View full abstract»

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  • Transflective LCDs With Two TFTs and Single Data Line

    Publication Year: 2011 , Page(s): 226 - 228
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (424 KB) |  | HTML iconHTML  

    A simplified single-cell-gap transflective liquid crystal display with two thin-film-transistors and only one data line is proposed. The simulated voltage-dependent transmittance (VT) and reflectance (VR) curves overlap reasonably well, which enables a single gamma curve driving. The need of only one data line improves the aperture ratio, reduces the fabrication cost, and stabilizes the manufacturing process. View full abstract»

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  • Stamped Self-Assembled Monolayers on Electrode for Connecting Organic Light-Emitting Diode and Organic Photovoltaic Device

    Publication Year: 2011 , Page(s): 229 - 234
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1118 KB) |  | HTML iconHTML  

    The stamping process of self-assembled monolayers (SAMs) with polydimethylsiloxane (PDMS) mold on the Ag electrode was demonstrated, for use as the anode of a top-emission organic light-emitting device (OLED) and the cathode of an organic photovoltaic (OPV) device stacked underneath. Such SAMs reduce the barrier for hole injection from the Ag to the hole-transport layer of OLED. The PDMS mold coated with SAMs can be used repeatedly, for more than nine times. In this tandem device, the power conversation efficiency under OPV-mode operation and the current efficiency under OLED-mode operation were nearly identical to those in individual devices without compromise. View full abstract»

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  • Cross-Self-Bias Rail-to-Rail Column Buffer for 640-Channel 6-Bit TFT-LCD

    Publication Year: 2011 , Page(s): 235 - 241
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1163 KB) |  | HTML iconHTML  

    A 640-channel 6-bit LCD column driver with a cross-self-bias push-pull buffer is presented. To design a column driver for thin-film transistor liquid-crystal displays (TFT-LCDs), both low power consumption and chip area are key problems that must be solved. Therefore, the proposed cross-self-bias buffer amplifier effectively reduces the circuit area and power consumption overheads of conventional class-AB biasing techniques. The 640-channel 6-bit column driver is implemented using 0.18-μm high-voltage CMOS technology. The proposed column driver is then used in an SXGA LCD panel to perform the experimental characterization. The measured performance of column driver exhibits maximum settling times of 1.4 μs and 1.2 μs for rising and falling edges, respectively, under one-dot inversion. The quiescent current consumption of the proposed rail-to-rail buffer is about 4 μA . View full abstract»

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  • Enhancement and Saturation Phenomena on Luminous Current and Power Efficiencies of Organic Light-Emitting Devices by Attaching Microlens Array Films

    Publication Year: 2011 , Page(s): 242 - 249
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1227 KB) |  | HTML iconHTML  

    Compared to the OLED with planar substrate, the luminous current efficiency and luminous power efficiency of the device are shown 25% and 36% enhancement, respectively, by attaching the microlens array film (MAF) having a fill factor of 0.788 and a height ratio of 0.46. Both the luminous current efficiency and luminous power efficiency of the organic light-emitting device (OLED) increased monotonically with increasing the fill factor of MAFs, regardless of their arrangements. However, the curve-fitting equation of the luminous power efficiency has a negative second-order term, which shows a saturation phenomenon. Based on the experimentally verified configuration, simulation showed that the luminous current and power efficiencies also increase along with increasing height ratio and they were found to have more pronounced saturation phenomena. As for the spectral characteristics, the peak wavelength of the planar OLED spectra got blue-shift and the full-width-at-half-maximum (FWHM) of its spectra decreased with increasing the viewing angles due to the microcavity theories. After MAFs are attached to the OLED, the FWHM of the OLED spectra decreased linearly by increasing the fill factor of the MAFs. We also observe blue shifts at different viewing angles which is the evidence that the waveguiding modes are being extracted. The saturation phenomena of efficiency enhancement imply that high fill factor and large height ratio of MAFs will certainly benefit for efficiency enhancement, however, full factor cases are not always the most desirable. Optimal fill factor and height ratio, which may be less than unity, will gain the best efficiency enhancement, suffer from less color deviation, and make fabrication easier. View full abstract»

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  • Low Voltage and High Transmittance Transflective Display Using Polymer-Stabilized Blue-Phase Liquid Crystal

    Publication Year: 2011 , Page(s): 250 - 254
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (731 KB) |  | HTML iconHTML  

    A fast response time, wide viewing angle, and single-cell-gap transflective display using polymer-stabilized blue-phase liquid crystal is proposed. The transmissive region has an in-plane wall-shaped electrode while the reflective region has an in-plane trapezoid electrode. Both of the electrodes generate a strong horizontal field, resulting in a low operating voltage and high transmittance and reflectance. In every driving voltage, the effective cell retardation value in the transmissive region is larger than that in the reflective region, so that the transmissive and reflective regions have similar gamma curves. View full abstract»

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  • Realization of Undistorted and Orthoscopic Integral Imaging Without Black Zone in Real and Virtual Fields

    Publication Year: 2011 , Page(s): 255 - 258
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (714 KB) |  | HTML iconHTML  

    When integral imaging systems work in their conventional configuration, the reconstructed images are pseudoscopic. The two-step pickup process is capable of giving an orthoscopic image, but it involves black zones, which affect the viewing angle. We analyze the black zones on the elemental images. The improved two-step pickup process is proposed to solve this problem, and the mathematical models of the improved digital secondary pickup process without black zones are also proposed. The simulation and experiment are presented. An undistorted and orthoscopic 3-D scene without black zones is reconstructed in real and virtual fields simultaneously. View full abstract»

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  • Characteristics of Moiré Spectra in Autostereoscopic Three-Dimensional Displays

    Publication Year: 2011 , Page(s): 259 - 266
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1236 KB) |  | HTML iconHTML  

    Theoretical and experimental investigations of moirés in three-dimensional displays are performed in the spectral domain . The method of investigation of spectra basing on summation is proposed. It gives the trajectories of spectral lines. The equations of trajectories are found analytically and confirmed experimentally. The locus of the optimal angle on the trajectories is found. The phenomenological mechanism of switching branches is proposed. The geometric structure of trajectories is determined. The experimental and theoretical data are in good agreement. View full abstract»

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  • Inter-Electrode Coupling and Crosstalk Mechanism in TFT-LCDs

    Publication Year: 2011 , Page(s): 267 - 273
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (977 KB) |  | HTML iconHTML  

    Inter-electrode coupling phenomena and their influences on crosstalk defects are theoretically studied in thin-film-transistor liquid crystal displays (TFT-LCDs). The proposed mechanism for crosstalk defects is confirmed through experimental performance. The theory and the experimental results show that inter-electrode coupling is significant in recent low-cost TFT-LCD panels, resulting in strong signal distortion in storage and common electrodes. The signal distortion induces not only strong horizontal crosstalk but also large luminance deformation. View full abstract»

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  • Dynamic Characteristic Optimization of 14 a-Si:H TFTs Gate Driver Circuit Using Evolutionary Methodology for Display Panel Manufacturing

    Publication Year: 2011 , Page(s): 274 - 280
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1423 KB) |  | HTML iconHTML  

    For thin-film transistor liquid crystal display (TFT-LCD) panel manufacturing, a gate driver circuit with amorphous silicon TFT plays an important role. In this paper, an amorphous silicon gate (ASG) driver circuit is optimized to improve circuit's dynamic characteristics. The adopted simulation-based evolutionary method integrates genetic algorithm and circuit simulator on the unified optimization framework. The circuit consisting of 14 hydrogenated amorphous silicon TFTs (a-Si:H TFTs) used in a large panel is optimized for the given specifications of the rise time <; 1.5 μs, the fall time <; 1.5 μs, and the ripple voltage <;3 V with minimizing the total layout area. By optimizing the width and passive components of the 14 devices, the results of this study successfully meet the desired specifications, where the sensitivity analysis is further conducted to verify the characteristic variation with respect to the optimized parameters. To validate the results, the optimized circuit is fabricated with 4- μm a-Si:H TFT process, and the experimental result confirms the practicability of achieved design. The ripple voltage within 2.0 V is successfully obtained while the rise and fall times satisfy the required specifications for the fabricated sample. A 35% reduction of the optimized total devices width of a-Si:H TFTs is achieved. View full abstract»

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  • A Stereoscopic Camera Model of Focal Plane Detector Array

    Publication Year: 2011 , Page(s): 281 - 288
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1365 KB) |  | HTML iconHTML  

    The optical geometry of two adjacent detectors in the focal plane of a scanning millimeter wave imaging system is similar to that of a stereo camera with optical axes of two component cameras which are diverging radially. The perceived image characteristics of the diverging-type stereo camera are analyzed, and they are compared with those of other camera arrangements, such as parallel- and radially converging-types. The distortions induce the image closer to the viewers for the diverging-type while away for the converging. The inducement is more prominent as the camera distance between two component cameras of the stereo camera, especially for the diverging-type. View full abstract»

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  • Enhancement of Angular Flux Utilization Based on Implanted Micro Pyramid Array and Lens Encapsulation in GaN LEDs

    Publication Year: 2011 , Page(s): 289 - 294
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (654 KB) |  | HTML iconHTML  

    In the application of projection display, the effective flux utilization is an important factor to the optical system with more optical efficiency of the system with utilization of the light source such as LEDs. In this paper, based on Monte Carlo ray tracing we simulate light extraction efficiency as well as directionality of the light pattern of sapphire-based and Thin-GaN LEDs implanted with micro-pyramid structure with or without lens encapsulation. We have shown that micro-pyramid structures at some specific slanted angles in the LEDs are useful to increase effective flux utilization through enhancement of light extraction efficiency. In the case of the sapphire-based GaN LEDs, the slanted angle in a range of 45° to 55° , with lens encapsulation, the enhancement ratio of angular flux utilization is as high as 390%. In the case of Thin-GaN LEDs, both the slanted angle of 25° without lens encapsulation and 45° with lens encapsulation (LEC) are effective ways to obtain high angular flux utilization. The enhancement ratio of angular flux utilization is as high as 500% or more and the light extraction efficiency in 30° light cone reaches more than 18%. View full abstract»

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  • Novel Visible Light Emitting Optical Fibers Using Up-Conversion

    Publication Year: 2011 , Page(s): 295 - 300
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    Optical fibers are described that emit visible light along their length when particulate up-converters in the cladding are excited by light from semiconductor light sources propagating in the core and leaking into the cladding. These eye-catching fibers can be made in almost any color. They can enhance the display of safety gear, enliven novelty clothing displays, make more spectacular theatrical costumes and find use in a wide range of specialty fabrics for other novel display applications. View full abstract»

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  • Corrections to “An Optical Method for Pretilt and Profile Determination in LCOS VAN Displays” [Mar 11 141-150]

    Publication Year: 2011 , Page(s): 301
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    In the above titled paper (ibid., vol. 7, no. 3, pp. 141-150, Mar. 11), an author's name and biography was inadvertently omitted. The correct byline and the author's biography are presented here. View full abstract»

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  • Blank page

    Publication Year: 2011 , Page(s): 302
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  • Why we joined

    Publication Year: 2011 , Page(s): 303
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  • Journal of Display Technology information for authors

    Publication Year: 2011 , Page(s): C3
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  • Blank page [back cover]

    Publication Year: 2011 , 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.