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Display Technology, Journal of

Issue 11 • Date Nov. 2011

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Displaying Results 1 - 14 of 14
  • [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): 581
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  • Blank page

    Page(s): 582
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  • 1000:1 Contrast Ratio Transmissive Electrowetting Displays

    Page(s): 583 - 585
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (330 KB) |  | HTML iconHTML  

    Transmissive electrowetting display pixels are reported with ~1000:1 contrast ratio and >; 50% optical transmission. This high performance is enabled by improved optical density of a black oil layer, and through use of an integrated metal reflector. The integrated metal reflector is placed such that black-oil motion self-aligns with the reflector, ensuring optimal operation of the pixel structure. The integrated reflector can also serve as a storage capacitor during active-matrix addressing. The pixels utilize new black SU-8 for the hydrophilic grid, which allows high contrast ratio in bright lighting. These high contrast electrowetting display pixels are increasingly compelling for high efficiency transmissive displays, and it is theoretically predicted that >; 80% transmission, <; 20 ms switching speed, and >; 1000:1 contrast ratio can be simultaneously achieved with optimized design. View full abstract»

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  • Compression of 3D Integral Images Using 3D Wavelet Transform

    Page(s): 586 - 592
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2198 KB) |  | HTML iconHTML  

    Integral imaging is a technique capable of displaying 3D images with continuous parallax in full natural color. It has been reported by many research groups and is becoming a viable alternative for 3D television. With the development of 3D integral imaging, image compression becomes mandatory for the storage and transmission of 3D integral images. In this paper, the use of the lifting scheme in the application of a 3D Wavelet Transform for the compression of 3D Integral Images is proposed. The method requires the extraction of different viewpoint images from an integral image. The 3D wavelet decomposition is computed by applying three separate 1D transforms along the coordinate axes of the given sequence of Viewpoint Images. The spatial wavelet decompositions on a single viewpoint and on the inter-viewpoint images are performed using the biorthogonal Cohen-Debauchies-Feauveau 9/7 and 5/3 filter banks, respectively. All the resulting wavelet coefficients from application of the 3D wavelet decomposition are arithmetic encoded. Simulations are performed on a set of different grey level 3D Integral Images using a uniform scalar quantizer with deadzone. The results for the average of the four intensity distributions are presented and compared with previous use of 2D DWT and 3D-DCT based schemes. It was found that the algorithm achieves better rate-distortion performance and reconstructs the images with much better image quality at very low bit rates. View full abstract»

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  • Bending Fatigue Study of Sputtered ITO on Flexible Substrate

    Page(s): 593 - 600
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1428 KB) |  | HTML iconHTML  

    Recently, there has been a tremendous rise in production of portable electronic devices. To produce flexible devices, flexible substrates should replace conventional glass substrates. Indium-tin-oxide (ITO) is the preferred transparent conducting layer used in the display technology. Although ITO has excellent sheet resistance and very good optical properties, ITO can crack at very low tensile strains which might cause failure in the conductive layer because of the unusual structure of a very thin film of brittle ceramic material applied to a polymer substrate. Therefore, the mechanics of ITO on flexible substrates has been thoroughly considered in the design and manufacturing of flexible devices. In a typical roll-to-roll manufacturing process, many challenges exist during the travel of the coated web over the rollers which produce bending stresses that might cause failure even if the stresses are below the yield strength of the material. Therefore, the high cycle bending fatigue of ITO thin films on flexible substrates is of a significant importance. In this work, high cycle bending fatigue experiments were conducted on ITO coated PET substrate. The effect of bending diameter, bending frequency, and sample width on the change in electrical resistance was investigated. High magnification images were obtained to observe crack initiation and propagating in the ITO layer. The goal of this work is to establish a baseline for a comprehensive reliability study of ITO thin films on flexible substrate. It was found that bending diameters as well as the number of bending cycles have a great influence on the electrical conductivity of the ITO layer. View full abstract»

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  • Real Multitouch Panel Without Ghost Points Based on Resistive Patterning

    Page(s): 601 - 606
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (773 KB) |  | HTML iconHTML  

    The real multitouch panel without ghost points is investigated using the structural patterns and an algorithm matrix of the two configurations. The pixels of patterns on the multitouch panel include virtual high and low resistances. The algorithm matrix with two configurations of equivalent circuit is derived using a voltage divider rule for array scanning. The fabrication process of structural patterns is carried out using microelectromechanical systems technology. The optical transmittance and absorbance of the multitouch panel in the UV, Vis, and IR regions are measured using a spectrophotometer. The multitouch panel, containing an array of 30 × 30, has a pixel size of 2 × 2 mm2 and a pitch distance of 2 mm. The average values of high and low impedances are 53.23 and 9.3 kΩ, respectively. The maximum transmittance is about 74.2% at the wavelength of 692 nm. The multitouch panel based on high and low impedance patterns has good adjacent touch resolution for reality multitouch applications. In addition, the patterned design and the algorithm matrix provide unlimited multitouch points and avoid the ghost points. View full abstract»

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  • A Novel Design for 3-Color LED Display Panel Based on CPU Processor

    Page(s): 607 - 614
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2108 KB) |  | HTML iconHTML  

    This paper focuses on designing a 3-color LED display panel based on CPU processor. These kinds of displays are produced in two ways-linear and multilinear. Regarding the block design presented in this study, we can produce both types of said displays with ideal dimensions. The content of this paper is presented in a way that it can be used for implementation of various types and sizes of displays. In this regard, all algorithms and circuit details are provided such that by reading this paper one can get completely familiar with function and production methods of discussed displays. It is notable that the presented design is completely exclusive which has been tested practically and all its faults have been dissolved. Software with unique capabilities has also been designed for preparing subjects to be shown in display panels. This software allows the user to display sentences with different fonts and sizes, photos and animations with more than 700 kinds of optional effects. View full abstract»

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  • Influence of Polymerization Temperature on Hysteresis and Residual Birefringence of Polymer Stabilized Blue Phase LCs

    Page(s): 615 - 618
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (671 KB) |  | HTML iconHTML  

    This paper investigates the voltage hysteresis effect and residual birefringence in the polymer-stabilized blue phase I and II, under various phase separation conditions. By irradiating samples with ultraviolet (UV) light and curing the samples at a reduced temperature, the polymer in the blue phase formed a compact network along the direction of the UV light irradiation. The dense polymer network pinned the cubic lattice structure of the blue phase enabling it to return to its original optical isotropic state. In this manner, hysteresis and residual birefringence were suppressed from 4.16% to 1.67% and 0.057% to 0.002%, respectively. Although the driving voltage remained high, the reduction in hysteresis and residual birefringence are precisely the advancements required for the accelerating development of blue-phase liquid crystal displays. View full abstract»

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  • Polymer Stabilized VA Mode Liquid Crystal Display

    Page(s): 619 - 623
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (865 KB) |  | HTML iconHTML  

    We used a polymer network to improve the response time of a vertical aligned (VA) mode liquid crystal display (LCD). The polymer network was anisotropic and was oriented in the same direction as the liquid crystal in the dark state. We studied the effect of pretilt angle and polymer concentration and measured the transmittance as well as scattering. With the polymer network, the turn-off time of VA-LCD significantly improved while the contrast ratio remained high. View full abstract»

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  • Blank page

    Page(s): 624
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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.