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Display Technology, Journal of

Issue 2 • Date Feb. 2011

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Displaying Results 1 - 17 of 17
  • [Front cover]

    Page(s): C1
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  • Journal of Display Technology publication information

    Page(s): C2
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  • Table of contents

    Page(s): 53
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  • Blank page

    Page(s): 54
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  • Color Breakup Suppression by Local Primary Desaturation in Field-Sequential Color LCDs

    Page(s): 55 - 61
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1092 KB) |  | HTML iconHTML  

    A novel method, local primary desaturation (LPD), was proposed to suppress color breakup for field-sequential color (FSC) LCDs. The LPD method was implemented on a 32-inch OCB-mode color filterless FSC-LCD with 35 × 19 individually controllable RGB-LED backlight segments. The performance of the method was evaluated via color breakup simulations and with a perception test. We also evaluated the image quality and the amount of power savings. The results showed that the LPD method reduced the color breakup from very annoying to almost imperceptible while maintaining a good image quality and reducing the power consumption significantly. View full abstract»

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  • Design of Analog Pixel Memory for Low Power Application in TFT-LCDs

    Page(s): 62 - 69
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2102 KB) |  | HTML iconHTML  

    Two types of analog memory cells realized in a 3-μm low temperature polycrystalline silicon (LTPS) technology are proposed to achieve low power application for thin film transistor liquid crystal displays (TFT-LCDs). By employing the inversion signal in the storage capacitor with complementary source follower, the frame rate to refresh the static image can be reduced from 60 to 3.16 Hz with the output decay less than 0.1 V under the input data from 1 to 4 V. To further diminish threshold voltage drop from source follower structure, a compensation technique is implemented to the proposed analog memory cells. In addition, asymmetric output voltage can be also minimized by adding a reference voltage to achieve symmetric output waveform. View full abstract»

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  • Real-Time Error Diffusion for Signal-to-Noise Ratio Improvement in a Holographic Projection System

    Page(s): 70 - 76
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (593 KB) |  | HTML iconHTML  

    Phase-only holographic projection offers a number of advantages over conventional imaging projection technology. Despite the advances in image quality provided by multiple subframe approaches, however, the use of binary phase holograms fundamentally limits the achievable resultant image contrast ratio. In this paper, a FPGA implementation of a real-time parallelized error diffusion algorithm is presented as a practical solution to this problem. View full abstract»

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  • Properties of Up Conversion Phosphors Necessary for Small Size Emissive Displays

    Page(s): 77 - 83
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1041 KB) |  | HTML iconHTML  

    Up converters combined with GaAs based semiconductor light sources are described as having potential for emissive displays with very large color gamut and very high resolution. To enable such displays the efficiency and temporal response of the up converting materials were studied and are reported. High efficiency is shown to be possible by proper preparation and utilization of the up converters. Up conversion displays can operate with refresh rates as high as 240 Hz. Operation as either a visible or near infrared display is possible. View full abstract»

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  • Uniform Illumination Design by Configuration of LED Array and Diffuse Reflection Surface for Color Vision Application

    Page(s): 84 - 89
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (664 KB) |  | HTML iconHTML  

    Illumination uniformity and color mixing results are essential for color vision applications. In this paper, an indirect method is proposed for the uniform illumination, and a mathematically simulated algorithm is developed. We integrate the method of light-emitting diode (LED) array and diffuse reflection surface for uniform illumination system. By considering each single LED as an imperfect Lambertian emitter, we discuss the irradiance distribution over a sphere's inner surface to the three-ring LED array. The sphere's inner surface is a diffuse reflection surface with high hemisphere reflectance. Using the bi-directional reflectance distribution functions (BRDF) of the sphere's inner surface, we simulate the uniformity of the LED illumination at varying distances. Finally, we design a practical LED illumination. The uniformity of practical LED illumination agrees with the simulated result. The results demonstrate the usefulness of this method for uniform illumination design. View full abstract»

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  • Smart Two-Dimensional Laser-Based Display

    Page(s): 90 - 95
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    In this paper, is proposed a smart design for a two-dimensional (2-D) optical display using 2-D laser scanning and an electronically programmable three-dimensional (3-D) beamforming lens element. Specifically, an electronically controlled variable focal length lens (ECVFL) adjusts its focus power to produce the smallest focused beam spot on the display screen within the designed variable screen distance range. Since the screen distance is known, the angular scan range for the scan mirrors can be computed to generate the desired number of scanned spots in the 2-D display. Thus a smart display with the smallest pixel spot size is formed leading to the highest spatial resolution display for any given distance. Furthermore, if the scan angles are increased, a larger size display of higher pixel count can be formed without sacrificing display pixel size at this larger display size. A proof-of-concept smart display optics system is designed and demonstrated for a red 633-nm laser wavelength and an optimal display variable screen distance of 20-150 cm, giving optimized display pixel sizes of 51.92 and 538.1 μm, respectively. View full abstract»

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  • Towards Color Stable Blue Primary for Displays: Suppress Field-Dependent Color Change in a Multilayered Electroluminescent Device

    Page(s): 96 - 104
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1734 KB) |  | HTML iconHTML  

    A blue fluorescent organic compound, 1-phenyl-3,4- dimethyl-1H-pyrazolo[3,4-b]quinoline (PAQ5), is a suitable emitter to enable a color stable blue emission from multilayered light emitting devices. The dopant PAQ5 functioned as an energy trap and an emitter having its HOMO/LUMO levels lying inside the band gap of the host to secure an efficient energy transfer; it also reduced barrier height for electron injection and improved electron transporting of the emitting layer. It lowered the turn-on electric field and enhanced luminance gradually as the dopant concentrations increased. A bright and color stable blue emission having CIE (x,y) = (0.168, 0.100) was obtained. Field-dependent color change of such multilayered devices within a wide range of driving electric fields was suppressed by PAQ5 dopant. A color purity of 0.815 was achieved. View full abstract»

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  • Blank page

    Page(s): 105 - 106
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  • Biophotonics 1

    Page(s): 107
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  • Biophotonics 2

    Page(s): 108
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  • Photonics for environmental sensing

    Page(s): 109
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  • Journal of Display Technology Information for authors

    Page(s): C3
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  • Blank page [back cover]

    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.