• Title/Summary/Keyword: current color

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ONO 구조의 nc-si NVM의 전기적 특성

  • Baek, Gyeong-Hyeon;Jeong, Seong-Uk;Jang, Gyeong-Su;Yu, Gyeong-Yeol;An, Si-Hyeon;Lee, Jun-Sin
    • Proceedings of the Korean Vacuum Society Conference
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    • 2011.02a
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    • pp.136-136
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    • 2011
  • 반도체 및 전자기기 산업에 있어서 NVM은 아주 중요한 부분을 차지하고 있다. NVM은 디스플레이 분야에 많은 기여를 하고 있는데, 측히 AMOLED에 적용이 가능하여 온도에 따라 변하는 구동 전류, 휘도, color balance에 따른 문제를 해결하는데 큰 역할을 한다. 본 연구에서는 bottom gate 구조의 nc-Si NVM 실험을 진행하였다. P-type silicon substrate (0.01~0.02 ${\Omega}-cm$) 위에 Blocking layer 층인 SiO2 (SiH4:N2O=6:30)를 12.5nm증착하였고, Charge trap layer 층인 SiNx (SiH4:NH3=6:4)를 20 nm 증착하였다. 마지막으로 Tunneling layer 층인 SiOxNy은 N2O (2.5 sccm) 플라즈마 처리를 통해 2.5 nm 증착하였다. 이러한 ONO 구조층 위에 nc-Si을 50 nm 증착후에 Source와 Drain 층을 Al 120 nm로 evaporator 이용하여 증착하였다. 제작한 샘플을 전기적 특성인 Threshold voltage, Subthreshold swing, Field effect mobility, ON/OFF current ratio, Programming & Erasing 특성, Charge retention 특성 등을 알아보았다.

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Adaptive Keyframe and ROI selection for Real-time Video Stabilization (실시간 영상 안정화를 위한 키프레임과 관심영역 선정)

  • Bae, Ju-Han;Hwang, Young-Bae;Choi, Byung-Ho;Chon, Je-Youl
    • Proceedings of the Korean Society of Broadcast Engineers Conference
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    • 2011.11a
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    • pp.288-291
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    • 2011
  • Video stabilization is an important image enhancement widely used in surveillance system in order to improve recognition performance. Most previous methods calculate inter-frame homography to estimate global motion. These methods are relatively slow and suffer from significant depth variations or multiple moving object. In this paper, we propose a fast and practical approach for video stabilization that selects the most reliable key frame as a reference frame to a current frame. We use optical flow to estimate global motion within an adaptively selected region of interest in static camera environment. Optimal global motion is found by probabilistic voting in the space of optical flow. Experiments show that our method can perform real-time video stabilization validated by stabilized images and remarkable reduction of mean color difference between stabilized frames.

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A Fundamental Study on Development Hydrothermal Temperature Measuring Tools Using Titanium (티타늄 금속을 활용한 수열온도 예측용 간이측정장치 개발에 관한 기초적 연구)

  • Sim, Sang-Rak;Ryu, Dong-Woo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2016.05a
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    • pp.199-200
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    • 2016
  • Accurate fire diagnoses are needed to properly repair and strengthen buildings affected by fire. The current diagnosis method of fire takes time and is ineffective. In previous research, Melting point temperature of each sequence to grasp easily the temperature of the concrete up to 200 ~ 600 ℃ was to estimate the temperature by utilizing a different sequence representing material.But In the form of conventional hydrothermal temperature prediction simple measuring device, it is difficult in the future buried in application to the construction site, there is a problem of damage when concrete pouring, and only the extension of life measured by the zinc has a problem does not distinguish between 400 ℃ and 500 ℃. Therefore this study is conducted by utilizing a titanium metal changes the color depending on the temperature to check for the applicability of the simple apparatus for measuring the temperature prediction sequence.

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Current development of microtip FEDs and carbon nanotube FEDs

  • Kim, Jong-Min
    • 한국정보디스플레이학회:학술대회논문집
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    • 2000.01a
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    • pp.49-50
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    • 2000
  • 5.2" microtip field emission displays (FEDs) with high voltage applications are fabricated. Nano-structural analysis on microtips is performed for the reliable operation of FEDs. Chemical compositions on the apex of microtips are fully analyzed. A charging mechanism on spacers is simulated and experimentally confirmed with micro-images. A gas-aging mechanism is also studied with integration step of FEDs. The brightness of more than 300 $cd/m^2$ is achieved. In addition, as a new concept, 9" color carbon nanotube FEDs (CNT-FEDs) are introduced using well-aligned carbon nanotubes on glass substrates by paste squeeze and surface treatment techniques. A number of carbon nanotubes, $5-10/{\mu}m2$, are uniformly distributed over a large area. The turn-on fields of 1 $V/{\mu}m$ and field emission currents of 1.5 mA at 3 $V/{\mu}m$ are acquired. Different mechanisms between microtip FEDs and CNT-FEDs are discussed.

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Red Organic Light-emitting Diodes utilizing Energy Transfer and Charge Trapping

  • Kim, Ju-Seung;Gu, Hal-Bon
    • Transactions on Electrical and Electronic Materials
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    • v.6 no.3
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    • pp.91-96
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    • 2005
  • We report the efficient red light-emitting diodes based on the fluorescent dye 4-(dicyanomethylene)-2-i-propyl-6-(1,1,7,7-tetramethyljulolidyl-9-enyl)-4H-pyran (DCJTI) and 5,6,11,12-tetraphenyl naphthacene (rubrene) codoped in the tris(8-hydroxyquinoline)aluminum $(Alq_3)$. Luminance efficiency of 2.2 cd/A with a Commission International De L'Eclairage (CIE) chromaticity coordinate of x, y = (0.640, 0:350) are achieved at the driving current density of $20\;mA/cm^2$. Adding the rubrene to the DCJTI in tris(8-hydroxyquinoline)aluminum $(Alq_3)$, the red color purity and luminance efficiency improved comparing to the DCJTI only doped devices because the rubrene molecules assist the polarization effect of DCJTI by molecular interaction and enhance the energy transfer from $(Alq_3)$ to DCJTI.

New Train Information Display System for Visibility Improvement of Passenger Service (승객서비스 향상을 위한 새로운 여객정보안내시스템)

  • Hwang, Jong-Gyu;Lee, Jae-Ho;Jo, Hyun-Jeong
    • Proceedings of the IEEK Conference
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    • 2006.06a
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    • pp.949-950
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    • 2006
  • Currently, most of TIDS(Train Information Display System) is operated colored-LED type equipment in Korea. This current TIDS equipment has not graceful display and causes passengers' fatigues, high operating and maintenance costs, and et al. To address these several, we are developed new colored-LCD type TIDS equipment. According to our developed new TIDS equipment, we can achieve high resolution and graceful color stone of information display.

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Esthetics of Dental Materials (임상가를 위한 특집 3 - 치과용 심미수복재의 심미적 특성)

  • Ahn, Jin-Soo
    • The Journal of the Korean dental association
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    • v.51 no.1
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    • pp.18-24
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    • 2013
  • Esthetic aspect is one of the most important factors in clinical dentistry. Esthetics of dental restorative materials consist of translucency, surface texture, and most importantly 'colour'. Main characteristics of optical properties and its clinical representation and general outlook as to the current information on colour and its representation has been considered in this study. Characteristics of esthetic materials are concerned with the field of science and dental professionals should take into consideration the importance, characteristics, and applications to actual clinical settings of esthetic restorative materials. Relevant information regarding natural teeth and esthetic restorative materials and training will lead to the heightened ability of dental professionals.

The Method to Measure Saliency Values for Salient Region Detection from an Image

  • Park, Seong-Ho;Yu, Young-Jung
    • Journal of information and communication convergence engineering
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    • v.9 no.1
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    • pp.55-58
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    • 2011
  • In this paper we introduce an improved method to measure saliency values of pixels from an image. The proposed saliency measure is formulated using local features of color and a statistical framework. In the preprocessing step, rough salient pixels are determined as the local contrast of an image region with respect to its neighborhood at various scales. Then, the saliency value of each pixel is calculated by Bayes' rule using rough salient pixels. The experiments show that our approach outperforms the current Bayes' rule based method.

Properties of color purity as white OLED based on $Zn(HPB)_2$ as blue emitting layer ($Zn(HPB)_2$를 블루 발광층으로 이용한 White OLED의 색순도 특성)

  • Kim, Dong-Eun;Kim, Byoung-Sang;Kim, Doo-Seok;Lee, Burm-Jong;Kwon, Young-Soo
    • Proceedings of the KIEE Conference
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    • 2006.10a
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    • pp.89-90
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    • 2006
  • We synthesized emissive materiaJs, nameJy $Zn(HPB)_2$. The fundamentaJ structures of the OLEDs were ITO / NPB (40 nm) $Zn(HPB)_2$ (40 nm) / $Alq_3$:DCJTB (20, 30, or 40 nm) / LiF / AI. We varied the thickness of $Alq_3$:DCJTB from 20 nm to 40nm. We measured current density-voJtage and luminance-voJtage characteristics at room temperature. When the thickness of the Alq3:DCJTB layer was 40 nm, white emission is achieved. The CIE coordinates are (0.32, 0.33) at an applied voltage of 14V.

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White OLED and Dual-plate OLED Display

  • Han, Chang-Wook;Pieh, Sung-Hoon;Sung, Chang-Jae;Kim, Hwa-Kyung;Pang, Hee-Suk;Choi, Hong-Seok;Lee, Nam-Yang;Ahn, Byung-Chul
    • 한국정보디스플레이학회:학술대회논문집
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    • 2009.10a
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    • pp.411-414
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    • 2009
  • We report single and two-stacked WOLED. Two-stacked WOLED structure adopts fluorescent blue EML and phosphorescent (red+green) EML. Current efficiency, EQE and color coordinate of two-stacked WOLED are 54.5cd/A, 28.8% and CIExy (0.322, 0.345), respectively. Those of single WOLED are also 20cd/A, 10% and CIExy (0.29, 0.37), respectively. Dual-plate OLED Display (DOD) employing the single WOLED shows high aperture ratio up to 67% in 2-inch panel of which pixel size is equivalent to that of 32 inch Full HD.

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