Journal of Display Technology (J DISP TECHNOL)

Publications in this journal

• Article: Non-homogeneity of lateral resolution in integral imaging

  H. Navarro, E. Sánchez-Ortiga, G. Saavedra, A. Llavador, A. Dorado, M. Martínez-Corral, B. Javidi
  Journal of Display Technology 01/2013; 9(1):37-43.
• Article: A Hybrid Spatial-Temporal Color Display With Local-Primary-Desaturation Backlight Scheme

  Yuning Zhang, E.H.A. Langendijk, M. Hammer, Fang-Cheng Lin
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  ABSTRACT: 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.
  Journal of Display Technology 01/2012;
• Article: Worldwide Uniformity of Color Reproduction in Handheld Video-Game Consoles and Applications

  Pedro J Pardo, Guadalupe Mart'inez-Borreguero, AL Perez, Mara Isabel Suero
  Journal of Display Technology 01/2012; 8(4):233-240.
• Article: Adaptive Focus Integral Image System Design Based on Fast-Response Liquid Crystal Microlens

  Yifan Liu, Hongwen Ren, Su Xu, Yuan Chen, Linghui Rao, T. Ishinabe, Shin-Tson Wu
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  ABSTRACT: 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.
  Journal of Display Technology 01/2012;
• Article: p-Type CuxO Films Deposited at Room Temperature for Thin-Film Transistors

  V. Figueiredo, E. Elangovan, R. Barros, J. V. Pinto, T. Busani, R. Martins, E. Fortunato
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  ABSTRACT: Thin-films of copper oxide (Cu infinity O) were sputtered from a metallic copper (Cu) target and studied as a function of oxygen partial pressure O-PP. A metallic Cu film with cubic structure obtained from 0% O-PP has been transformed to cubic Cu2O phase for the increase in O to 9% but then changed to monoclinic CuO phase (for OPP >= 25%). The variation in crystallite size (calculated from x-ray diffraction data) was further substantiated by the variation in grain size (surface microstructures). The Cu O films produced with O ranging between 9% and 75% showed p-type behavior, which were successfully applied to produce thin-film transistors.
  Journal of Display Technology 01/2012; 8(1):41-47.
• Article: Design of Integrated Gate Driver With Threshold Voltage Drop Cancellation in Amorphous Silicon Technology for TFT-LCD Application

  Li-Wei Chu, Po-Tsun Liu, Ming-Dou Ker
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  ABSTRACT: 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.
  Journal of Display Technology 01/2012;
• Article: Reduction of Short Channel Effects and Hot Carrier Induced Instability in Fully Self-Aligned Gate Overlapped Lightly Doped Drain Polysilicon TFTs

  Antonio Valletta, Luca Maiolo, Luigi Mariucci, Alessandro Pecora, Matteo Rapisarda, Guglielmo Fortunato, Stan D. Brotherton
  Journal of Display Technology 01/2012; VOL. 8(NO. 1):18.
• Source

  Available from: ucf.edu

  Article: Blue-Phase Liquid Crystal Displays With Vertical Field Switching

  Hui-Chuan Cheng, Jin Yan, Takahiro Ishinabe, Norio Sugiura, Chu-Yu Liu, Tai-Hsiang Huang, Cheng-Yeh Tsai, Ching-Huan Lin, Shin-Tson Wu
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  ABSTRACT: A low-voltage, high-transmittance, hysteresis-free, and submillisecond-response polymer-stabilized blue-phase liquid crystal (BPLC) display with vertical field switching (VFS) and oblique incident light is demonstrated. In the VFS mode, the electric field is in longitudinal direction and is uniform. By using a thin cell gap and a large oblique incident angle, the operation voltage is significantly reduced which plays a key role to eliminate hysteresis and residual birefringence. The VFS mode is a strong contender for the emerging BPLC display and photonic devices. Index Terms—Blue phase liquid crystal (BPLC), hysteresis free, low voltage.
  Journal of Display Technology 01/2012; 8.
• Article: Does Veiling Glare in the Human Eye Hinder Detection in High-Dynamic-Range Displays?

  M Choi, D Sharma, F Zafar, W C Cheng, L Albani, A Badano
  Journal of Display Technology 01/2012; 8(5):273-282.
• Article: Electrooptical Properties of Single-Walled Carbon-Nanotube Mixed Liquid-Crystal Cells With Rubbed and Ion-Beam-Treated Alignment Layers

  Hong-Gyu Park, Hae-Yun Jeong, Young-Hwan Kim, Byoung-Yong Kim, Jeong-Hwan Kim, Hongil Yoon, Dae-Shik Seo
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  ABSTRACT: 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.
  Journal of Display Technology 01/2012;
• Article: Influence of Polymerization Temperature on Hysteresis and Residual Birefringence of Polymer Stabilized Blue Phase LCs

  Chun-Yuan Fan, Hung-Chang Jau, Tsung-Hsien Lin, Fang Cheng Yu, Tai-Hsiang Huang, Chuyu Liu, N. Sugiura
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  ABSTRACT: 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.
  Journal of Display Technology 12/2011;
• Source

  Available from: uc.edu

  Article: 1000:1 Contrast Ratio Transmissive Electrowetting Displays

  A. Schultz, J. Heikenfeld, H.S. Kang, W. Cheng
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  ABSTRACT: 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.
  Journal of Display Technology 12/2011;
• Article: Compression of 3D Integral Images Using 3D Wavelet Transform

  A. Aggoun
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  ABSTRACT: 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.
  Journal of Display Technology 12/2011;
• Article: Polymer Stabilized VA Mode Liquid Crystal Display

  S.E. Hicks, S.P. Hurley, R.S. Zola, D. Yang
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  ABSTRACT: 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.
  Journal of Display Technology 12/2011;
• Article: Evolution of Modern Display Technologies in a 3D Ecosystem

  R. Zwing, S. Weitbruch, G. Lubcke, C. Correa
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  ABSTRACT: Since its invention by the end of the 19th century, display technologies have undergone several (r-)evolutions, from the introduction of color in the late 1950s to the arrival of the first flat panel TVs in mid-1990s. Today, we are faced again with a further evolutionary step manifested by the introduction of another dimension: vision depth. In this paper, we will give a rapid overview of the latest key evolutions of the flat panel technologies before entering the world of stereoscopic displaying, its status, trends, and outlook.
  Journal of Display Technology 11/2011;
• Article: An Intra-Panel Interface With Clock-Embedded Differential Signaling for TFT-LCD Systems

  H.K. Jeon, Y.H. Moon, J.K. Kang, L.S. Kim
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  ABSTRACT: In this paper, an intra-panel interface with a clock embedded differential signaling for TFT-LCD systems is proposed. The proposed interface reduces the number of signal lines between the timing controller and the column drivers in a TFT-LCD panel by adopting the embedded clock scheme. The protocol of the proposed interface provides a delay-locked loop (DLL)-based clock recovery scheme for the receiver. The timing controller and the column driver integrated with the proposed interface are fabricated in 0.13- μm CMOS process technology and 0.18-μm high voltage CMOS process technology, respectively. The proposed interface is verified on a 47-inch Full High-Definition (FHD) (1920RGB×1080) TFT-LCD panel with 8-bit RGB and 120-Hz driving technology. The maximum data rate per differential pair was measured to be as high as 2.0 Gb/s in a wafer test.
  Journal of Display Technology 11/2011;