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Display Technology, Journal of

Issue 4 • Date Dec. 2006

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Displaying Results 1 - 25 of 29
  • [Front cover]

    Publication Year: 2006 , Page(s): C1
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  • Journal of Display Technology publication information

    Publication Year: 2006 , Page(s): C2
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  • Table of contents

    Publication Year: 2006 , Page(s): 317 - 318
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  • Quantitative Comparison of Color Performances Between IPS and MVA LCDs

    Publication Year: 2006 , Page(s): 319 - 326
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (985 KB) |  | HTML iconHTML  

    Color gamut and color shifts of the film-compensated multi-domain in-plane-switching (IPS) and multi-domain vertical alignment (MVA) liquid crystal displays (LCDs) are calculated quantitatively using light-emitting diodes (LEDs) and cold-cathode fluorescent lamp (CCFL) backlight. Simulation results indicate that the LED backlight exhibits better angular color uniformity and smaller color shifts than CCFL. In addition, the color gamut can be further widened and the color shift reduced when using color-sequential RGB-LED backlight without color filters. In general, both IPS and MVA LCDs show relatively small color shift under different backlights, but MVA has a lower color shift using the optimized uniaxial compensation films View full abstract»

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  • Enhancing Birefringence by Doping Fluorinated Phenyltolanes

    Publication Year: 2006 , Page(s): 327 - 332
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (970 KB) |  | HTML iconHTML  

    We have designed, synthesized, and evaluated the physical properties of some high birefringence (Deltan) isothiocyanato phenyltolane and quaterphenyl liquid crystals. These compounds exhibit Deltan~0.48-0.52 at room temperature and wavelength lambda=633 nm. Laterally substituted short alkyl chains and fluorine atom eliminate smectic phase and lower the melting temperature. The moderate melting temperature and very high clearing temperature make those compounds attractive for eutectic mixture formulation. These compounds can be used as dopants for color-sequential liquid crystal displays or eutectic mixtures for laser beam steering View full abstract»

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  • Temperature-Dependent Dynamic Behaviors of Organic Light-Emitting Diode

    Publication Year: 2006 , Page(s): 333 - 340
    Cited by:  Papers (9)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (875 KB) |  | HTML iconHTML  

    A systematic investigation of temperature-dependent dynamic behaviors of NPD-Alq3 organic light-emitting diodes (OLEDs) is carried out. Through an in-depth numerical analysis, it has been found that the luminance decreases and consequently the turn-on voltage increases with decreasing temperature due to a reduction of thermally activated hopping speed, which retards the rise of electroluminescence (EL) upon turn-on as well as the discharge upon turn-off of OLEDs. Most importantly, however, the device efficiency is literally raised as the temperature decreases, a direct consequence of enhanced charge-balance factor. It is also demonstrated that the EL delay upon turn-on is mostly determined by the electron transport through the electron transport layer (ETL), while the fast EL decay (short-lived EL tail) upon turn-off is mainly by the rapid discharge of the steep pileup of carriers at the NPD/Alq3 interface. The long-lived EL tail is shown to be more pronounced under lower temperatures. In response to a train of voltage pulses, the delay of EL occurring for the first voltage pulse has vanished for the subsequent pulses regardless of temperature due to space charges remaining inside the device after turn-off (in the "off-state"). However, it appears that the pulse-to-pulse interference by the space charge effects is more significant under lower temperatures View full abstract»

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  • Measurement of Electron Mobility in Alq3 From Optical Modulation Measurements in Multilayer Organic Light-Emitting Diodes

    Publication Year: 2006 , Page(s): 341 - 346
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (314 KB) |  | HTML iconHTML  

    The dynamic characteristics of multilayer organic light-emitting diodes (OLEDs) determine the refresh rate in display applications, and are of great importance for practical organic displays. They also serve as an important tool in studying the transport mechanisms in organic conductors. Here, the modulation characteristics of several conventional small-molecule OLED structures [consisting of ITO/PEDOT:PSS(50 nm)/TPD(50 nm)/Alq3(various)/LiF(1 nm)/Al(90 nm)] are measured and analyzed in terms of mobility in and thickness of the Alq 3 layer. Their optical response was shown to be limited by electron transport across the Alq3. Extracted electron mobilities were about 2-4times10-6 cm2/Vmiddots (consistent with that reported in the literature) and near-identical values for mobility were obtained from devices of different thicknesses, suggesting that this method measures mobility independent of interface trap charging. This novel technique is a complement to large signal time of flight or delay time measurements (which can include interface and trap charging during the measurement) and can serve as a flexible method to study transport in actual devices View full abstract»

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  • A Stable Voltage-Programmed Pixel Circuit for a-Si:H AMOLED Displays

    Publication Year: 2006 , Page(s): 347 - 358
    Cited by:  Papers (6)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1321 KB) |  | HTML iconHTML  

    Hydrogenated amorphous silicon (a-Si:H) active matrix organic light-emitting diode (AMOLED) displays are attractive given the potentially low manufacturing cost and ultimately low-temperature fabrication enabling using flexible substrates. Although the conventional two thin-film transistor (2-TFT) AMOLED voltage-programmed pixel circuit (VPPC) can provide high resolution and high yield, the 2-TFT VPPC is prone to image retention over time due to shift in the threshold voltage (VT-shift) of a-Si:H TFTs. This paper presents a new driving scheme that not only preserves the simplicity of the 2-TFT VPPC, but also demonstrates high uniformity. Experimental results indicate that the current drop in the new driving scheme is less than 11% after 15 days of operation whereas it is over 50% for the conventional driving scheme. Moreover, the new driving scheme is less sensitive to temperature variations due to an internal feedback mechanism. After a 70% change in the temperature, the current in the conventional driving scheme increases by as much as 300%. However, the current in the driving scheme presented here is approximately constant View full abstract»

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  • Multiview Image Acquisition and Projection

    Publication Year: 2006 , Page(s): 359 - 363
    Cited by:  Papers (6)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (613 KB) |  | HTML iconHTML  

    A solution for describing both the multiview image set, obtained with a parallel camera layout, and the perceived image in a projection-type full parallax multiview imaging system with a parallel projector layout, is derived. This is done with the use of 4times4 homogenous matrices to quantitatively analyze the image quality in the system. The solution provides a means of finding properties and/or behavior of the perceived image changes depending on the viewer's position in the system. The solution can analytically describe the appearance of three-dimensional images in the space generated by the multiview image set displayed on a projection screen View full abstract»

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  • Amorphous Silicon Display Backplanes on Plastic Substrates

    Publication Year: 2006 , Page(s): 364 - 371
    Cited by:  Papers (1)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1807 KB) |  | HTML iconHTML  

    Amorphous silicon (a-Si) thin-film transistor (TFT) backplanes are very promising for active-matrix organic light-emitting diode displays (AMOLEDs) on plastic. The technology benefits from a large manufacturing base, simple fabrication process, and low production cost. The concern lies in the instability of the TFTs threshold voltage (VT) and its low device mobility. Although VT-instability can be compensated by means of advanced multi-transistor pixel circuits, the lifetime of the display is still dependent on the TFT process quality and bias conditions. A-Si TFTs with field-effect mobility of 1.1 cm2/Vmiddots and pixel driver circuits have been fabricated on plastic substrates at 150 degC. The circuits are characterized in terms of current drive capability and long-term stability of operation. The results demonstrate sufficient and stable current delivery and the ability of the backplane on plastic to meet AMOLED requirements View full abstract»

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  • A New Gate Induced Barrier Thin-Film Transistor (GIB-TFT) for Active Matrix Liquid Crystal Displays: Design and Performance Considerations

    Publication Year: 2006 , Page(s): 372 - 377
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (721 KB) |  | HTML iconHTML  

    Reducing the OFF-state leakage current, and eliminating the pseudo-subthreshold conduction in polysilicon thin-film transistors (TFTs), is a major problem since the channel current is controlled by the potential barrier associated with the grain boundaries in the undoped channel. In this paper, we present for the time, a new gate-induced barrier TFT (GIB-TFT) in which the undoped channel has no grain boundaries, while the channel current is controlled by inducing large potential barriers in the channel. We demonstrate that the proposed GIB-TFT exhibits a steep subthreshold slope and at least three orders of magnitude less OFF-state leakage current when compared to the conventional polysilicon TFTs. Using two-dimensional and two-carrier device simulation, we have analyzed the various performance and design considerations of the GIB-TFT and explained the reasons for its improved performance View full abstract»

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  • Three-Phase Electronic Ballast With Current-Equalization Function

    Publication Year: 2006 , Page(s): 378 - 385
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1395 KB) |  | HTML iconHTML  

    This paper proposes a three-phase electronic ballast with current-equalization function. By properly designing the resonant tank and the values of the resonant inductance and resonant capacitance, the current difference between lamps can be significantly reduced. Hence, current-equalization can be achieved by means of impedance-matching. Without an additional current-equalization circuit, the cost of the proposed circuit is reduced due to fewer components. The analysis and design of the proposed circuit will be presented in this paper. Finally, the proposed three-phase electronic ballast with current-equalization function will be implemented to validate and demonstrate the performance and feasibility of the proposed circuit View full abstract»

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  • An Output Channel Nonuniformity Compensation Driving Method in Flat Panel Display Driving Circuits

    Publication Year: 2006 , Page(s): 386 - 392
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1164 KB) |  | HTML iconHTML  

    Modern flat panel displays, including thin-film transistor liquid crystal displays (TFT-LCDs) and organic light-emitting diodes (OLEDs), pursue more and more natural color expression. This requires the data driving system should produce very fine and accurate signal voltages or currents. Especially, the uniformity among channels of a driving system is critically important because the color or luminance differences among columns are easily noticeable. We propose a simple and efficient driving method for solving the artifacts caused by the existing nonuniformity among channels of a driving system, and confirms its impact by simulations using C-programming. The nonuniformity among channels mostly stem from the random offset of the output circuits of a driving system, which in turn is caused by the process variations. The proposed driving method shares N-output circuits between N-output channels such that the existing offsets of the channels are averaged out. Thus, the output signal error due to the offsets spreads out among the channels, improving the uniformity between the channels View full abstract»

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  • Pre-Processing of Integral Images for 3-D Displays

    Publication Year: 2006 , Page(s): 393 - 400
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (5406 KB) |  | HTML iconHTML  

    This paper seeks to explore a method to accurately correct geometric distortions caused during the capture of three-dimensional (3-D) integral images. Such distortions are rotational and scaling errors which, if not corrected, will cause banding and moire effects on the replayed image. The method for calculating the angle of deviation in the 3-D Integral Images is based on Hough Transform. It allows detection of the angle necessary for correction of the rotational error. Experiments have been conducted on a number of 3-D integral image samples and it has been found that the proposed method produces results with accuracy of 0.05 deg View full abstract»

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  • Compression of Optically Encrypted Digital Holograms Using Artificial Neural Networks

    Publication Year: 2006 , Page(s): 401 - 410
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3004 KB) |  | HTML iconHTML  

    Compression and encryption/decryption are necessary for secure and efficient storage and transmission of image data. Optical encryption, as a promising application of display devices, takes advantage of both the massive parallelism inherent in optical systems and the flexibility offered by digital electronics. We encrypt real-world three-dimensional (3D) objects, captured using phase-shift interferometry, by combining a phase mask and Fresnel propagation. Compression is achieved by nonuniformly quantizing the complex-valued encrypted digital holograms using an artificial neural network. Decryption is performed by displaying the encrypted hologram and phase mask in an identical configuration. We achieved good quality decryption and reconstruction of 3D objects with as few as 2 bits in each real and imaginary value of the encrypted data View full abstract»

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  • Multi-Spectral Holographic Three-Dimensional Image Fusion Using Discrete Wavelet Transform

    Publication Year: 2006 , Page(s): 411 - 417
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2751 KB) |  | HTML iconHTML  

    We present multi-spectral holographic three-dimensional image fusion using the discrete wavelet transform (DWT). The fusion results are compared with those of the Gaussian and Laplacian pyramid fusion methods. The advantage of the DWT over other methods is that it has more flexibility in controlling high frequency components as well as low frequency components, which improves the fused image quality. A wavelength tunable solid-state pumped laser is used to record up to 11 holograms with wavelengths from 567 to 613 nm. We present the fused reconstructed holographic images including multi-spectral fused images from the recorded multiple holograms. Fused multi-wavelength reconstructed holographic images provide multi-spectral information about the objects View full abstract»

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  • Corrections to “Dielectric Spectroscopy of Metal Nanoparticle Doped Liquid Crystal Displays Exhibiting Frequency Modulation Response”

    Publication Year: 2006 , Page(s): 418
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  • Special issue on IEEE/OSA Journal of Display Technology on LCD TVs

    Publication Year: 2006 , Page(s): 419
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  • Special issue on modeling of guided wave photonic devices

    Publication Year: 2006 , Page(s): 420
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  • Special issue on convergence of optical wireless access networks

    Publication Year: 2006 , Page(s): 421
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  • Special issue on single photon counting: Detectors and applications

    Publication Year: 2006 , Page(s): 422
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  • Special issue on optical code in optical communications and networks

    Publication Year: 2006 , Page(s): 423
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  • The 14th International Conference on Solid-State Sensors and Actuators

    Publication Year: 2006 , Page(s): 424
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  • Join EDS and get online access

    Publication Year: 2006 , Page(s): 425
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  • Special issue on Optical Fiber Sensors

    Publication Year: 2006 , Page(s): 426
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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.