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Display Technology, Journal of

Issue 3 • Date March 2013

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Displaying Results 1 - 15 of 15
  • 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): 129
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  • [Blank page]

    Page(s): 130
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  • A Study on the Reliability Optimization of LED-Lit Backlight Units in Mobile Devices

    Page(s): 131 - 138
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (435 KB) |  | HTML iconHTML  

    This paper studies the prevention of premature failures of LED backlights used in mobile devices that are subject to different use conditions. This is a vitally important topic for consumer mobile device manufacturers as the life expectancy of two identical devices from the same production line may vary substantially under different operating environments and use conditions. These differences are not addressed by traditional reliability assessment methods documented in many electronics handbooks. The paper outlines the use of a prognostics approach and condition-based monitoring for optimizing the reliability in the LED backlight display unit of mobile devices. View full abstract»

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  • Hardware Engine for Real-Time Pen Tracking on Electrophoretic Displays

    Page(s): 139 - 145
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2748 KB) |  | HTML iconHTML  

    Although the electrophoretic display (EPD) has become the main solution to the display of an electronic reader (E-Reader), the latency of displaying a new image on the EPD is much lower than that on liquid crystal displays. This problem leads to poor user experience when a user wants to annotate some important points by supplying with more comments on the EPD. The technical issues that should be dealt with include the pixel interpolation between the plotted pixels and the fast driving waveform design for those interpolated pixels. In this paper, we propose a new hardware engine that performs real-time pixel interpolation to compensate the resolution mismatch between the touch panel and the EPD. In addition, a new fast driving scheme for plotting the interpolated pixels to the black state on the EPD is also proposed. The experimental results show that the engine can complete the pixel interpolation in 2 ms and the pixels will not be overdriven. The overall latency of the pen tracking function is much shorter than that of the previous approaches. View full abstract»

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  • Wide Color-Gamut Improvement With Skin Protection Using Content-Based Analysis for Display Systems

    Page(s): 146 - 153
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1586 KB) |  | HTML iconHTML  

    In this paper, we propose an improved color-gamut method for liquid crystal displays (LCD) with multi-phosphor white light emitting diodes (MPW LED) and a modified rich color image processing approach with skin protection. The color saturation is always used to broaden the color-gamut. By increasing the color saturation, the expanded color-gamut can be observed in the CIE 1931 color space. The human skin color is typically memorized by color information. In order to increase the color saturation, the traditional rich color method makes skin color appear unnatural, so a modified rich color method with human skin color protection is proposed. The skin color protection generates normalized chrominance and illumination features. The skin chrominance model uses the normalized color-information of the skin as a classifier in a real-time skin pixel detection system. Several geometric patterns are used to tune the skin chrominance model with the principal components in color space to give the system a better detection performance. Consequently, the skin region information is used to tune the enhancement parameter in the modified rich color image processing approach. In comparison, the proposed approach yields a better image quality than the traditional one. In mobile display systems, due to the limitation of bandwidth and memory capacity, determining how to realize the functions of a wide color-gamut improvement method with skin protection on mobile display platform is very important. Ultimately, we have implemented our proposed method in the FPGA and displayed the image on the ARM platform. View full abstract»

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  • An Effective Hybrid Depth-Generation Algorithm for 2D-to-3D Conversion in 3D Displays

    Page(s): 154 - 161
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1762 KB) |  | HTML iconHTML  

    In recent years, 3D display technology has been receiving increasingly more attention. The most intuitive 3D method is to use two temporally synchronized video streams for the left and right eyes, respectively. However, traditional 2D video contents are captured by one camera, and in order to synthesize the left and right views as the behavior of two cameras, depth map information is required. In this paper, we propose a hybrid algorithm for 2D-to-3D conversion in 3D displays; it is a good way to solve the problem of traditional 2D video contents which need to generate 3D effects in 3D displays. We choose three depth cues for depth estimation: motion information, linear perspective, and texture characteristics. Moreover, we adopt a bilateral filter for depth map smoothing and noise removal. From the experimental results, execution time can be reduced by 25%-35% and the depth perception score is between 75 and 85. Thus, the human eye cannot sense the noticeable differences from the final 3D rendering. Furthermore, it is very suitable to apply our proposed hybrid algorithm to 2D-to-3D conversion in 3D displays. View full abstract»

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  • A Novel Method to Accurately Predict Color Information of Liquid Crystal Displays With Light Leakage From Black Pixels

    Page(s): 162 - 169
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2428 KB) |  | HTML iconHTML  

    This paper proposes a new method to predict color information of liquid crystal displays (LCDs) very accurately. Leaked light from black sub-pixels causes errors of the color prediction based on the individually measured RGB color information. We present a new method to remove the bad influence of the light leakage. We prove that this work can calculate the pure colorimetric information regardless of the shapes of opto-electronic transfer function (OETF) of LCDs. Without this technology, average errors of luminance (ΔY) and chromaticity coordinate (Δxy) over 30 colors were 0.58 cd/m2 and 0.04, respectively. When we applied the proposed method, however, average errors of ΔY and Δxy were 0.03 cd/m2 and 0.005, respectively. Experimental results show that our method can extract pure primary color information with extremely low errors. View full abstract»

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  • Large-Area Capacitive Active Touch Panel Using the Method of Pulse Overlapping Detection

    Page(s): 170 - 175
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1120 KB) |  | HTML iconHTML  

    In this paper, we propose a novel active touch panel circuit using the RC time constant changes when the panel is touched to induce pulse overlapping. The transient ON current of the pixel thin-film transistor(TFT) is to be detected for the judgment whether panel is touched or not. The proposed circuit has many advantages, such as simple structure, multi-touch, low operating power, as well as significant current to be read out easily by low cost ICs. Especially, it provides excellent stability since the circuit is hardly influenced by variation of TFTs. Discrete TFTs are used to build the proposed circuit to verify its function and the function is further demonstrated in a 2-inch 9×9 array. The potential for large area applications is proven by simulating a 42-inch touch panel with proper assumptions. View full abstract»

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  • A 10-Bit DAC With 1.6-Bit Interpolation Cells for Compact LCD Column Driver ICs

    Page(s): 176 - 183
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1658 KB) |  | HTML iconHTML  

    This paper proposes a 10-bit DAC for LCD column driver ICs. This architecture achieves 10-bit resolution with a compact die size smaller than that of a conventional 8-bit resistor-string DAC (RDAC). The proposed DAC combines a 6-bit RDAC and a 4-bit DAC-embedded op with 1.6-bit current-mode interpolation cells. The 6-bit RDAC uses a one-voltage selector instead of a two-voltage selector; therefore, it requires a smaller silicon die area for the voltage selector. Fewer differential pairs are required for the voltage interpolation because the DAC-embedded op uses 1.6-bit interpolation cells with binary-weighted reference voltages. This further reduces the silicon die area. The 10-bit DAC prototype was realized in 0.35-μm CMOS technology with the worst DNL/INL of 0.45/0.93 LSB. The 10-bit DAC occupies only 64% of the conventional 8-bit RDAC area. View full abstract»

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  • Special Issue on Holographic Displays

    Page(s): 184
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  • Special Issue Fourth International Workshop on Compact Thin Film Transistor (CTFT)

    Page(s): 185
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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.