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Display Technology, Journal of

Issue 8 • Date Aug. 2009

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Displaying Results 1 - 12 of 12
  • [Front cover]

    Publication Year: 2009 , Page(s): C1
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  • Journal of Display Technology publication information

    Publication Year: 2009 , Page(s): C2
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  • Table of contents

    Publication Year: 2009 , Page(s): 291 - 292
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  • Optical Design of LCOS Optical Engine and Optimization With Genetic Algorithm

    Publication Year: 2009 , Page(s): 293 - 305
    Cited by:  Papers (9)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1760 KB) |  | HTML iconHTML  

    This paper demonstrates an optical design of miniature of LCOS optical engine and optics with white light-emitting diode (LED) and the most importantly, proposes a new optimization method for non-image optics via Genetic Algorithm (GA) written in Optical Software ASAP, in order to achieve best performance for light efficiency and uniformity. Thanks to the development of modern digital equipment, optimization work for non-image optics plays a role in modern optical engineering. So far Least Damping Square, Taguchi Fuzzy, and simulation annealing methods have been introduced and some of them has been applied to many items of commercial simulation software. However, GA is first introduced in this paper for non-image optical design and optimization, although it has been for many years been used as effective optimization method in image optics; In this paper, GAs are written in the form of macro language from ASAP. During the design process, we used one OPTEK Technology OVS3WBCR44 LED as the light source of the general projection display. Because of the extensiveness of the LEDs, the collection efficiency within the desired acceptance angle was not expected to be high. Due to the particular acceptance angle (cone), we needed a condenser lens system, which satisfied the light small angle incident to 0.59-in liquid-crystal-on-silicon (LCOS) pixels. The optical engine in this paper is designed for a compact LCOS projector with a white LED light source and the employment of an LCOS panel has been reduced to one piece in order to get the best volumetric size. Optical design specification is mainly for an 11" projected screen, whose objective distance is close to 420 mm with fixed focal lens. GA methods are applied in this research in order to achieve maximum brightness and uniformity. Compared to traditional optimization methods, such as Least Damping Square, the GA used in this research gives reasonably good results. View full abstract»

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  • Luminance Uniformity of Large-Area OLEDs With an Auxiliary Metal Electrode

    Publication Year: 2009 , Page(s): 306 - 311
    Cited by:  Papers (14)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (862 KB) |  | HTML iconHTML  

    One of the key issues of a large-area organic light-emitting diode (OLED) for flat panel lighting applications is to enhance the uniformity of light emission. In this work, we have investigated the effect of an auxiliary metal (chrome) electrode in association with a device configuration on the luminance uniformity of a large-area (15 times 15 cm2) white OLED. We demonstrate that the ratio between the effective horizontal resistance of anode (indium-tin-oxide (ITO) with the grid patterned metal electrode) and the vertical resistance of the OLED device is the critical factor to determine the luminance uniformity. Moreover, the luminance uniformity is shown to be a function of the current density and degraded with increasing current density. Namely, the OLED panel with the 200-mu m-wide metal lines exhibits the luminance uniformity as high as 90% at 200 mA and 85% at 500 mA. View full abstract»

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  • Theoretical Model of Yb ^{3 + } -Er ^{3 + } -Tm ^{3 + } -Codoped System for White Light Generation

    Publication Year: 2009 , Page(s): 312 - 318
    Cited by:  Papers (11)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (769 KB) |  | HTML iconHTML  

    We present a theoretical model of Yb3+-Er3+-Tm3+-co-doped system for white light generation. The energy level, electron transition process and numerical model are proposed to calculate fluorescence intensity of the system pumped by 980 nm laser. The numerical results reveal that our theoretical model is in good agreement with experimental results in literature. Optimal active ion concentrations are proposed to enable the system to emit red, blue and green lights which are mixed to generate white light in telluride matrix for display and lighting system. View full abstract»

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  • A Simple Transflective LCD for Mobile Applications

    Publication Year: 2009 , Page(s): 319 - 322
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (467 KB) |  | HTML iconHTML  

    A double-cell-gap transflective liquid crystal display (TR-LCD) based on 63.6deg twisted nematic mode is proposed. With only one uniaxial positive A-film in transmissive region, this normally black TR-LCD exhibits several attractive features, such as high optical efficiency, low operation voltage, acceptable viewing angle, and good cell gap tolerance. Moreover, the electro-optical characteristics of reflective and transmissive regions match with each other well. Its fabrication process is fairly simple and it is suitable for mobile applications. View full abstract»

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  • Application of Taguchi Method in Light-Emitting Diode Backlight Design for Wide Color Gamut Displays

    Publication Year: 2009 , Page(s): 323 - 330
    Cited by:  Papers (12)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (497 KB) |  | HTML iconHTML  

    This paper utilizes the Taguchi design method to optimize the design parameters of a light-emitting diode (LED) backlight unit for wide color gamut liquid crystal displays (LCDs). In optimizing the design, the parametric analyses consider two particular regions of the backlight unit, namely, the color-mixing zone and the extractor zone. The Taguchi experiments are configured in L9 (34 ) orthogonal arrays and are designed to evaluate the effects of the design parameters on the color-difference, optical efficiency and luminance of the unit. The analysis of variance (ANOVA) results reveal that the optical efficiency and color-difference properties are determined primarily by the reflector design and the length of the color mixing zone, respectively, while the luminance to the LCD panel is affected principally by the taper angle of the optical microstructures in the extractor zone. The optimal design parameters of the color-mixing zone and extractor zone are estimated from the Taguchi S/N ratio data and the ANOVA results, and are verified via ray-tracing simulations. For an input flux of 1501 lm, the optimal design shows 0.01 of the color differences in CIE 1976 color space, 85% of the optical efficiency, and 10675 nits of luminance. Thus, the optimized backlight unit provides an ideal solution for the illumination of large-scale LCD display devices. View full abstract»

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  • Broadband Wide-View LCDs With Small Color Shift

    Publication Year: 2009 , Page(s): 331 - 334
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (339 KB) |  | HTML iconHTML  

    We proposed a broadband wide-view liquid crystal display (LCD) with two biaxial films. Based on different dispersion properties of these two films, we optimized their in-plane phase retardation values to minimize the light leakage and color shift over the whole viewing cone. The broadband wide view and low color shift properties will further lead to high contrast ratio and good color quality, especially for low gray level images. View full abstract»

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  • Design Optimization of Reflective Polarizers for LCD Backlight Recycling

    Publication Year: 2009 , Page(s): 335 - 340
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (584 KB) |  | HTML iconHTML  

    We systematically study and optimize the design of multilayer birefringent reflective polarizers for recycling the backlight of liquid crystal displays. Factors affecting the Bragg reflection are analyzed in detail, including number of layers for establishing Bragg reflection, refractive index difference, effective refractive index, and thickness ratio. Different methods for achieving broadband reflection are investigated, so that the reflective polarizer could cover the entire visible wavelengths and a large incident angle. In addition, the effects of material dispersion on the device design are analyzed. View full abstract»

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  • Special issue of the IEEE/OSA Journal of Display Technology on 3–D Displays and Visualization

    Publication Year: 2009 , Page(s): 341
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    Freely Available from IEEE
  • Journal of Display Technology information for authors

    Publication Year: 2009 , Page(s): C3
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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.