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Display Technology, Journal of

Issue 12 • Date Dec. 2012

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Displaying Results 1 - 18 of 18
  • Front Cover

    Publication Year: 2012 , Page(s): C1
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  • Journal of Display Technology publication information

    Publication Year: 2012 , Page(s): C2
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  • Table of contents

    Publication Year: 2012 , Page(s): 679
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  • [Blank page]

    Publication Year: 2012 , Page(s): 680
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  • New LTPS Pixel Circuit With AC Driving Method to Reduce OLED Degradation for 3D AMOLED Displays

    Publication Year: 2012 , Page(s): 681 - 683
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (527 KB) |  | HTML iconHTML  

    This work presents a new low-temperature polysilicon (LTPS) thin-film transistor pixel circuit with a novel driving scheme that is based on the simultaneous emission and reverse-biased methods. During high-speed 3D operation at 240 Hz, the proposed circuit can successfully compensate for the TFT threshold voltage variation and improve the IR drop in the power line. Simulation and experimental results confirm the stability of the OLED current and the amelioration of the OLED lifetime. Furthermore, over the entire range of data voltages, the nonuniformity of OLED current is less than 5%. View full abstract»

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  • Scene-Adaptive RGB-to-RGBW Conversion Using Retinex Theory-Based Color Preservation

    Publication Year: 2012 , Page(s): 684 - 694
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2218 KB) |  | HTML iconHTML  

    This paper proposes a retinex theory-based approach to RGB-to-RGBW conversion that preserves the human color perception within a pre-determined level of color distortion for RGBW displays. The proposed method primarily consists of two procedures. In the first, it searches for the maximum intensity level that induces no color distortion for a given image by extracting the white spectra from the common components of the RGB primary colors and adjusting all the pixels' gains uniformly. In the second, the proposed method applies an additional gain to each pixel based on its chromaticness and controls the color distortions arising from the individual gains using the color perception estimated by retinex theory and a feedback mechanism. Experimental results showed that the proposed method was more effective than conventional methods in terms of intensity increment and color preservation. For Kodak test images, the proposed method increased the average intensity by 1.4987 times with a color-distortion level of 0.0094 compared to reference RGB displays, whereas the conventional methods increased the average intensity by 0.8624-1.3429 times with color-distortion levels of 0.0325-0.0682. The surplus intensity yielded by the proposed method can be used to dynamically reduce the power consumption of a liquid crystal display (LCD) backlight or to provide brighter images on LCDs. View full abstract»

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  • Role of {\hbox {HfO}} _{2} / {\hbox {SiO}}_{2} Gate Dielectric on the Reduction of Low-Frequent Noise and the Enhancement of a-IGZO TFT Electrical Performance

    Publication Year: 2012 , Page(s): 695 - 698
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (744 KB) |  | HTML iconHTML  

    High-κ dielectric is regarded as an effective material to reduce the operating voltage of the amorphous indium gallium zinc oxide (a-IGZO) thin film transistors (TFTs). However, the dielectric with high permittivity often has the drawbacks of inducing small conduction band offset energy and high interface trap density. Here a bilayer HfO2/SiO2 gate dielectric for thin-film transistors (TFTs) is employed to address the issues. Compare to the a-IGZO TFT with solely 15 nm-thick HfO2 gate dielectric, the TFT with the bilayer HfO2/SiO2 (10 nm/5 nm) gate dielectric improves the subthreshold swing (SS) from 0.22 to 0.12 V/decade, the mobility from 1.4 to 7 cm2/V·s and current on-off ratio from 9×106 to 1.3×10 9. Finally, Hooge's parameters (extracted from the low-frequency noise measurement) of a-IGZO TFTs were investigated to understand the defects near the channel/dielectrics interface so that the role of the thin SiO2 layer can be verified. The device with bilayer HfO2/SiO2 structure exhibits a value of 2×10-3, which is an order of magnitude lower than the one with a single HfO2 layer. The Hooge's parameter of our bilayer dielectric is the lowest among the reported metal-oxide based TFTs on the glass substrate. View full abstract»

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  • Image Saturation Improvement for 180 Hz Stencil-FSC LCD With Side-Lit LED Backlight

    Publication Year: 2012 , Page(s): 699 - 706
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1867 KB) |  | HTML iconHTML  

    The green-based 180 Hz Stencil-FSC method was proposed to effectively suppress color breakup for a field-sequential-color liquid crystal display (FSC-LCD). Nevertheless, this method has an issue on green color desaturation. Therefore, we further propose the “limited backlight signal ratio” (LBSR) to determine a proper backlight signal to increase image color saturation and simultaneously suppress color breakup. To realize a thin and high image quality eco-display, in addition, the light spread function model and the number of backlight divisions for a side-lit backlight are optimized and combined with the LBSR stencil-FSC method. View full abstract»

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  • Plasma Display Panel Driver With Dissymmetric Energy Transfer Speed for High Efficiency and Fast Voltage Transition

    Publication Year: 2012 , Page(s): 707 - 713
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1264 KB) |  | HTML iconHTML  

    A plasma display panel (PDP) driver with dissymmetric energy transfer speed is designed to obtain fast voltage transition during the up-commutation period and improved efficiency during the down-commutation period. The proposed driver configures the sustain circuit and the resonant circuit in such a way that the resonant network is energized by the sustain voltage level and the half sustain voltage level in charging and discharging the panel capacitor, respectively. The energy transferred into the panel from the power supply is twice as fast as the conventional Weber-type driver biased by half sustain voltage level, for improved image quality and display resolution. The proposed driver, on the other hand, recovers the panel energy using the resonant circuit with the half sustain voltage and increased inductance, leading to enhanced energy recovery. Moreover, the proposed driver is supplied from half of required sustain voltage level. As a result, the proposed driver can be designed by devices with reduced voltage rating compared with the conventional Weber-type driver. Therefore, the PDP driver presented in this paper can feature faster sustain voltage transition, higher brightness, uniform images, low-voltage power supply, low-voltage-rating switching devices, and high efficiency. View full abstract»

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  • Fast 3D Computational Integral Imaging Using Graphics Processing Unit

    Publication Year: 2012 , Page(s): 714 - 722
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2002 KB) |  | HTML iconHTML  

    In computational integral imaging (II), the elemental images are processed on serial processors to reconstruct one plane (slice) of the 3D scene. In this paper, we present a fast three-dimensional (3D) integral imaging system via a graphics processing unit (GPU) which allows parallel processing with multiple processors. We show that it can significantly accelerate 3D scene reconstruction in II using the GPU based stream-processing model. The streaming version of the ray back propagation algorithm with lookup table is presented. It is demonstrated that the ray back propagation algorithm with a lookup table for the 3D scene reconstruction in II to be processed on parallel processors may greatly improve computational speed while requiring minimally larger memory space as compared with CPU sequential computing. Experimental results verify the feasibility for parallel implementation of 3D integral imaging. To the best of our knowledge, this is the first study on achieving a 3D computational integral imaging system using GPU computing with high parallelism. View full abstract»

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  • Digital Driving Method for Low Frame Frequency and 256 Gray Scales in Liquid Crystal on Silicon Panels

    Publication Year: 2012 , Page(s): 723 - 729
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1485 KB) |  | HTML iconHTML  

    A liquid crystal on silicon (LCoS) panel for projector applications is developed using a new digital driving method to increase the gray scale of the projected image without increasing the driving frequency. The LCoS panel, which has a wide video graphics array (WVGA) resolution, is fabricated using 0.18 μm CMOS process technology with an area of 9600 μm × 5800 μm. The projection system is successfully demonstrated using the fabricated LCoS panel and the proposed digital driving method. The measured results of the projection system show that the proposed driving method achieves an 8-bit gray scale at a driving frequency of 75.6 MHz, which is less than 13.7% of the frequency in previously reported methods such as frame rate control and pulse width modulation. View full abstract»

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  • Special issue on Green Technology

    Publication Year: 2012 , Page(s): 730
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  • IEEE Copyright Form

    Publication Year: 2012 , Page(s): 731 - 732
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  • List of Reviewers

    Publication Year: 2012 , Page(s): 733
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  • 2012 Index Journal of Display Technology Vol. 8

    Publication Year: 2012 , Page(s): 734 - 751
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  • Open Access

    Publication Year: 2012 , Page(s): 1000
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  • Journal of Display Technology information for authors

    Publication Year: 2012 , Page(s): C3
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  • Blank page

    Publication Year: 2012 , 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.