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Display Technology, Journal of

Issue 12 • Date Dec. 2011

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Displaying Results 1 - 20 of 20
  • [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): 625
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  • Blank page

    Page(s): 626
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  • Critical Field for a Hysteresis-Free BPLC Device

    Page(s): 627 - 629
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (321 KB) |  | HTML iconHTML  

    A correlation between the peak electric field and hysteresis of a polymer-stabilized blue-phase liquid crystal (BPLC) is found experimentally. If the peak electric field is below ~ 5 V/μm, hysteresis is negligible. Based on this guideline, we propose elliptical protrusion electrodes to reduce peak electric field which in turn eliminates hysteresis while keeping a high transmittance. Such a hysteresis-free BPLC device is highly desirable for display and photonic applications. View full abstract»

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  • Eco-Displays: The Color LCD's Without Color Filters and Polarizers

    Page(s): 630 - 632
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (430 KB) |  | HTML iconHTML  

    The higher and higher power consumption of LCD-TVs is accompanied by an increase in panel size. By eliminating two of the most power hungry optical components: color filters and polarizers, the stencil-field-sequential-color (Stencil-FSC) with RGBW-LED backlight is applied to LCDs with 120-240 Hz field rates to not only efficiently suppress color breakup but also yield an ultra-low average power consumption. The optical power consumption can be reduced to 13% compared to that of current FSC-LCDs. As a result, a 42-in LCD-TV may only require 9 W optical power consumption. View full abstract»

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  • Cross Pairing of Select and Data Voltages to Display Grayscales in Liquid Crystal Displays

    Page(s): 633 - 635
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (344 KB) |  | HTML iconHTML  

    Successive approximation technique (SAT) has select voltages of row waveforms paired up with data voltages of column waveforms to achieve the maximum selection ratio. Cross pairing of select and data voltages without compromising the selection ratio generates more rms voltages as compared to SAT. Grayscales can be displayed with less number of voltages in the addressing waveforms and less number of time intervals in a cycle as compared to SAT by cross pairing of select voltages with data voltages. Better brightness uniformity among pixels that are driven to same grayscale can be achieved by cross pairing because the width of the select pulses increases due to less number of time intervals in a cycle as compared to SAT. About 50% reduction in number voltages in row waveforms and column waveforms in addition to a 50% reduction in number of time intervals in a cycle can be achieved as compared to SAT by cross pairing select and data voltages. View full abstract»

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  • Solution-Processed Electrophosphorescent Devices Based on Small-Molecule Mixed Hosts

    Page(s): 636 - 639
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (629 KB) |  | HTML iconHTML  

    Highly efficient electrophosphorescent organic light-emitting diodes (PHOLEDs) containing mixed hosts of bis(3,5-di(9H-carbazol-9-yl)phenyl)diphenylsilane (SimCP2) and 1,3-bis[(4-tert-butylphenyl)-1,3,4-oxadiazolyl]phenylene (OXD-7) and a soluble derivative of the green emitter fac-tris(2-phenylpyridine)iridium (III) [(Ir(ppy)3 ] have been demonstrated. All organic layers were mixed in a single layer for solution processing during the fabrication of the PHOLEDs. The amorphous mixed host of SimCP2:OXD-7:Ir(ppy)3 exhibited ambipolar charge transport as well as high hole and electron mobilities on the order of 10-7 cm2 /Vs from space-charge-limited current measurement. The values of both the hole and electron mobilities were 100 times greater than that of the widely used poly(9-vinylcarbazole) (PVK):OXD-7:Ir(ppy)3 host, resulting in efficient charge balance in the SimCP2 host. Based on a simple fabrication process of single-layer PHOLED, a green device with the maximum luminous and power efficiencies of 42 cd/A and 20 lm/W, respectively, was obtained at 600 cd/m2. View full abstract»

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  • Environmental, Optical, and Electrical Stability Study of Solution-Processed Zinc–Tin–Oxide Thin-Film Transistors

    Page(s): 640 - 643
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (247 KB) |  | HTML iconHTML  

    In this paper, we report the environmental, optical, and gate bias stress stability of amorphous zinc-tin-oxide (ZTO) thin-film transistors (TFTs) fabricated by sol-gel spin-coating method. The ZTO TFTs showed excellent environmental and optical stability. The threshold voltage stability of ZTO TFTs was sensitive to both positive and negative gate bias stress. Maximum threshold voltage shifting of +1.9 and -3.2 V was observed under a gate bias stress of +10 and -10 V, respectively, with no significant change to subthreshold swing value. View full abstract»

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  • Electrooptical Properties of Single-Walled Carbon-Nanotube Mixed Liquid-Crystal Cells With Rubbed and Ion-Beam-Treated Alignment Layers

    Page(s): 644 - 648
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1004 KB) |  | HTML iconHTML  

    The electrooptical properties of single-walled carbon-nanotube (SWCNT) mixed liquid-crystal (LC) cells fabricated by rubbing and ion-beam (IB) process are investigated. The increase of SWCNT concentration in the LC mixture led to a decrease in the threshold voltage of twisted nematic cells by reducing the screening effect. Threshold voltages of 1.3 and 1.7 V are lowered to 0.8 and 1.2 V, respectively, with SWCNT mixtures up to 10×10-3 wt%. LC alignment characteristics including LC orientation state, transmittance spectra, pretilt angle, and thermal stability of LC cells are also observed. View full abstract»

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  • Analysis of Nonaqueous Electrowetting Fluids for Displays

    Page(s): 649 - 656
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1224 KB) |  | HTML iconHTML  

    Water remains the most extensively studied electrowetting fluid, but few reports exist on nonaqueous conducting solvents. Reported herein is a complete analysis of alternate fluids for electrowetting devices and displays. Emphasis is provided on real-world testing parameters, including contact angle response and immiscibility with oil, environmental range, interfacial tension, ionic content and influence on dielectric reliability, compatibility with additives such as soluble dyes or particle dispersions, and cross-diffusion of fluids or solutes. Out of 16 preselected fluids, six exhibited electrowetting performance comparable to the best aqueous:surfactant solutions. Use of the nonaqueous fluids in advanced display devices is also demonstrated. View full abstract»

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  • Design of Integrated Gate Driver With Threshold Voltage Drop Cancellation in Amorphous Silicon Technology for TFT-LCD Application

    Page(s): 657 - 664
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1500 KB) |  | HTML iconHTML  

    A new integrated gate driver has been successfully designed and fabricated by amorphous silicon (a-Si) technology for a 3.8-in WVGA (800 × 480) TFT-LCD panel. With the proposed threshold voltage drop-cancellation technique, the output rise time of the proposed integrated gate driver can be substantially decreased by 24.6% for high-resolution display application. Moreover, the proposed noise reduction path between the adjacent gate drivers can reduce the layout area for slim bezel display. The transmittance brightness and contrast ratio of the demonstrated 3.8-inch panel show almost no degradation after the 500 h operation under 70°C and -20°C conditions. View full abstract»

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  • A Hybrid Spatial-Temporal Color Display With Local-Primary-Desaturation Backlight Scheme

    Page(s): 665 - 673
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1338 KB) |  | HTML iconHTML  

    Field-sequential-color mode has benefits on energy efficiency, because colors are made by flashing the backlight red, green, and blue and the color filters are not needed, leading to increased light transmission. However, field-sequential-color mode causes annoying color breakup. In previous studies, a spatio-temporal display has been proposed as a hybrid solution to balance the increase of light transmission and the suppression of color breakup. However, color breakup remains visible for critical image content. In this paper, a 120-Hz liquid crystal display with two-color filters mounted with a backlight consisting of a light emitting diode matrix is introduced. The backlight colors are locally desatured according to the local image content, so the color difference between fields is reduced, and the perceived color breakup is effectively suppressed. Various examples with different color filter and backlight settings are described and analyzed, aiming at different display-performance objectives. View full abstract»

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  • Adaptive Focus Integral Image System Design Based on Fast-Response Liquid Crystal Microlens

    Page(s): 674 - 678
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    The discrepancy of disparity and accommodation in current 3D display systems is one source of discomfort for the audience. To solve this problem, an adaptive focus integral image (InIm) system is proposed, which could adjust the image location according to the video content. To prove concept, a fast-response liquid crystal microlens is proposed and its performance is simulated. View full abstract»

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  • Gap-Type a-Si TFTs for Front Light Sensing Application

    Page(s): 679 - 683
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (992 KB) |  | HTML iconHTML  

    The photo effect of gap-gate type hydrogenated amorphous silicon thin-film transistor (a-Si:H TFT) has been studied to be employed as light sensors owing to its outstanding photosensitivity. It can be operated in on region to provide a higher current level as the sensing signal. However, the gap-gate a-Si:H TFT suffers from some problems such as the photo-current degradation resulted from illuminations and the disturbance of the backlight source when it is used as the sensor in display panel. A new method is proposed to overcome the above issues, which gives a feasible way for this kind of TFT to be used in TFT LCD panel. In this paper, the operation of the sensing method is fully described. View full abstract»

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  • Viewing Angle and Voltage Dependence of the Visibility of Cell Gap Defects in LCD Panels

    Page(s): 684 - 687
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (481 KB) |  | HTML iconHTML  

    Perception of visible defects induced by local cell gap variations in liquid crystal display (LCD) panels is studied as a function of the viewing direction and applied voltage. Our results are reported in terms of the LCD sensitivity parameter defined in our previous publication and can be readily used in conjunction with the psycho-physical models of Mura perception. We apply our methods to a particular example of a normally white TN LCD and show that the Mura visibility depends strongly on the viewing angle as well as the applied voltage. We conclude that a complete study of the -parameter as a function of the viewing angle and applied voltage is crucial in the correct assessment of the sensitivity of an LCD panel to cell gap variation. View full abstract»

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  • List of Reviewers

    Page(s): 688
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  • 2011 Index Journal of Display Technology Vol. 7

    Page(s): 689 - 704
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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.