73 results on '"Woo Jin Nam"'
Search Results
2. The Effect of Transformation Leadership on Employees’ Organizational Commitment : Mediating Effects of Empowerment Controlled by the Perceived Organizational Support
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Woo-Jin Nam and Byung-Seop Yoon
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Transformational leadership ,media_common.quotation_subject ,Organizational commitment ,Empowerment ,Psychology ,Perceived organizational support ,Social psychology ,media_common - Published
- 2020
3. A Case Report of using Korean Medical Treatment for a Paralytic Ileus Patient
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Bo-sung Kim, Ji-won Baek, Won-ho Kong, Yun-leong Park, Won-Il Kim, Yeo Bin Park, and Woo-jin Nam
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medicine.medical_specialty ,Medical treatment ,business.industry ,General surgery ,medicine ,Paralytic ileus ,business - Published
- 2020
4. Clinical and cost-effectiveness of collaborative traditional Korean and Western medicine treatment for low back pain: A protocol for a prospective observational exploratory study
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Sang Ho Lee, Eun Hye Hyun, Woo Jin Nam, Dong Hyung Seo, Hye-Yoon Lee, Young Il Kim, Seon Jong Kim, Hyun-Min Kim, Nam-Kwen Kim, Hye Won Kim, Eun-Jung Kim, and Yoon Gyung Song
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medicine.medical_specialty ,Comparative Effectiveness Research ,Cost effectiveness ,Cost-Benefit Analysis ,Comparative effectiveness research ,Exploratory research ,03 medical and health sciences ,0302 clinical medicine ,Patient satisfaction ,Milestone (project management) ,Medicine ,Humans ,030212 general & internal medicine ,Prospective Studies ,030203 arthritis & rheumatology ,business.industry ,Medical record ,Traditional Korean medicine ,General Medicine ,Combined Modality Therapy ,Medicine, Korean Traditional ,Patient Satisfaction ,Family medicine ,Observational study ,Erratum ,business ,Low Back Pain - Abstract
BACKGROUND In South Korea, a few patients with low back pain (LBP) are currently being treated with a combination of traditional Korean medicine (KM) and Western medicine (WM). Although a recent research has reported results regarding patient satisfaction and exploratory effectiveness, evidence of comparative effectiveness still needs to be reviewed. The aim of this study is to evaluate the clinical and cost-effectiveness of KM and WM collaborative treatment (CT) compared with that of sole treatment (ST) for patients with LBP in Korea. METHOD/DESIGN This multisite, prospective observational comparative effectiveness research study is part of a nationwide pilot project for KM and WM collaboration launched by the Korean Ministry of Health and Welfare. The duration of the study is 8 weeks, and the target number of inclusion is 360 patients. Participants receive treatment according to their treatment plan, and a researcher conducts investigations thrice, every 4 weeks. In the final analysis, the merged data from the participants' questionnaire responses, hospital medical records, and administrative data, and Health Insurance Review and Assessment service data will be compared between the CT and ST groups. DISCUSSION This study will provide clinical and economic information about CT for LBP, which might be a milestone for establishing future polices about this collaboration in Korea. TRIAL REGISTRATION The study protocol has been registered with the Clinical Research Information Service (KCT0002827).
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- 2018
5. 64.2: Panel and Circuit Designs for the World's First 65-inch UHD OLED TV
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Jin-Mok Kim, Pan-Youl Kim, Woo-Jin Nam, Shinji Takasugi, Ryosuke Tani, Chang-Ho Oh, Sun Young Kwon, Joong-Sun Yoon, Soon-II Yun, Joon-Kyu Park, and Byung-Chul Ahn
- Subjects
Indium gallium zinc oxide ,Reliability (semiconductor) ,Materials science ,business.industry ,Product (mathematics) ,Electrical engineering ,OLED ,business ,Frame rate ,Oxide thin-film transistor ,Electronic circuit - Abstract
We have developed the world's first 65-inch UHD (also called 4K, 3840×2160) OLED TV with a coplanar-type IGZO(Indium Gallium Zinc Oxide) TFTs. In this paper, we discuss our excellent WRGB panel designs and circuits to achieve the high frame frequency and the product reliability.
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- 2015
6. 64.1: The Thin and Slim Design for 65-inch UHD OLED TV
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Jong-Hee Park, Byung-Chul Ahn, Woo-Jin Nam, Chang-Ho Oh, Koichi Miwa, Joon-Kyu Park, Sung-Min Baik, Shin Hyunsu, Kwan-Ho Park, Pan-Youl Kim, Sang-Hyun Kim, Jin-Mok Kim, Chul Park, and Ryosuke Tani
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Engineering ,business.industry ,Computer graphics (images) ,Resolution (electron density) ,OLED ,business - Abstract
The thin and slim design of 65-inch UHD OLED TV is reviewed in this paper. With its outstanding image qualities in UHD resolution is noteworthy the thin and slim curved screen. Reverse bonding technology enables the slim bezel design. A thin and curved back plate holds the module in shape and dissipates heat effectively. The source printed-circuit-boards are fixed directly to the backside of module to realize the ultra-thinedge design of the 65-inch OLED TV.
- Published
- 2015
7. Asymmetric frequency dependence of plasma jet formation in resonator electrode
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Seok Yong Jeong, Woo Jin Nam, Jae Koo Lee, Gunsu Yun, and Seungtaek Lee
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010302 applied physics ,Materials science ,Input impedance ,Plasma ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,010305 fluids & plasmas ,Resonator ,Nuclear magnetic resonance ,Critical frequency ,Physics::Plasma Physics ,Physics::Space Physics ,0103 physical sciences ,Electrode ,Electromagnetic electron wave ,Coaxial ,Atomic physics ,Microwave - Abstract
Large aspect ratio plasma jets with sub-mm diameter are produced by a microwave coaxial resonator electrode. The jet length shows a sharp asymmetric dependence on the drive frequency: the plasma jet suddenly turns off below a critical frequency while the jet length slowly decreases above the frequency. A general mechanism is proposed to explain the asymmetry based on a universal feedback relation among the plasma impedance, the power coupling efficiency and the plasma dimension in resonator type electrodes. The input impedance of the resonator electrode changes depending on the plasma size formed in the electrode. The degree of the impedance mismatch between the electrode-plasma and the power source determines the power coupling efficiency and the resistive loss in the electrode which in turn affects the plasma size. The asymmetric dependence on the drive frequency is a consequence of the fact that the resonance frequency decreases for increasing plasma size. The feedback model shows a good agreement with the experimental measurements, providing essential information for the plasma control.
- Published
- 2017
8. 58.2: 55-inch OLED TV using Optimal Driving Method for Large-Size Panel based on InGaZnO TFTs
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Kwan-Ho Park, Ji‐Hun Kim, Chang-Ho Oh, Pan-Youl Kim, Woo-Jin Nam, Jinmog Kim, Tani Ryosuke, Byung-Chan Song, Joong-Sun Yoon, Dae‐Hyun Kim, SungJin Hong, and Byung-Chul Ahn
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Brightness ,Materials science ,Offset (computer science) ,Pixel ,Thin-film transistor ,business.industry ,OLED ,Electronic engineering ,Optoelectronics ,Oxide thin-film transistor ,business ,Large size ,Threshold voltage - Abstract
In this paper, we provide the best way to drive large-size OLED panel. This method compensates for variations in the on-current and threshold voltage by extracting the TFT characteristics of each pixel of the panel. It also compensates the time-dependent degradation characteristics of the TFT. From the extracted characteristics, corrected image-data are generated that is composed gain and offset. By driving in the data which is corrected, it is possible to improve the uniformity of brightness and increase the life-time of the panel. Consequently, 55-inch OLED TV was manufactured and commercialized. For the commercialization of large-size OLED TV, this driving method is very suitable and it will become an important.
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- 2014
9. Case Study of the Patient Considering Chronic Renal Failure Treated with Bojungikki-tang and Bojungikki-tang gamibang
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So-Youn Jung, Su-Hyun Bae, Dong-Il Park, Sun-Young Park, and Woo-jin Nam
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medicine.medical_specialty ,Creatinine ,Weakness ,business.industry ,Nausea ,medicine.medical_treatment ,Traditional Korean medicine ,Anorexia ,Moxibustion ,Surgery ,chemistry.chemical_compound ,Hemiparesis ,chemistry ,Internal medicine ,medicine ,Acupuncture ,medicine.symptom ,business - Abstract
Objectives : The purpose of this study is to report the clinical effect of herbal medicine on the patient considering chronic renal failure. The patient complained of hemiparesis, general weakness, anorexia, nausea and dizziness. Methods : According to the traditional Korean medicine syndrome differentiation, the patient was classified as Deficiency of Spleen Qi and prescribed Bojungikki-tang and Bojungikki-tang gamibang as well as acupuncture and moxibustion treatment. Changes of BUN, creatinine, VAS for genaral weakness, nausea, dizziness were compared before and after treatment for 2 weeks. Results : After treatment, the level of BUN and creatinine was decreased and main symptoms were improved. Conclusions : Herbal medicine Bojungikki-tang and Bojungikki-tang gamibang with acupuncture and moxibustion treatment would be efficient to the patient of chronic renal failure. Keyword : Chronic renal failure, Bojungikki-tang, Deficiency of spleen Qi, General weakness.
- Published
- 2013
10. Design of Low-Area HEVC Core Transform Architecture
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Woo-Jin Nam, Seung-Mok Han, and Seongsoo Lee
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HEVC ,Engineering ,Adder ,Shift-and-add ,Core transform ,business.industry ,Process (computing) ,Chip ,Multiplexer ,Gate count ,Electronic engineering ,Hardware_ARITHMETICANDLOGICSTRUCTURES ,Architecture ,PE reuse ,business ,Low area ,Computer hardware ,Block (data storage) ,Data compression - Abstract
This paper proposes and implements an core transform architecture, which is one of the major processes in HEVC video compression standard. The proposed core transform architecture is implemented with only adders and shifters instead of area-consuming multipliers. Shifters in the proposed core transform architecture are implemented in wires and multiplexers, which significantly reduces chip area. Also, it can process from 4×4 to 16×16 blocks with common hardware by reusing processing elements. Designed core transform architecture in 0.13um technology can process a 16×16 block with 2-D transform in 130 cycles, and its gate count is 101,015 gates., {"references":["T. Wiegand, G. Sullivan, G. Bjontgaard, and A. Luthra, \"Overview of the H.264/AVC Video Coding Standard\", IEEE Transactions on Circuits and Systems for Video Technology, vol. 13, no. 7, pp. 560-576, Jul. 2003.","G. Sullivan, J. Ohm, W. Han, and T. Wiegand, Overview of the High Efficiency Video Coding (HEVC) Standard\", IEEE Transactions on Circuits and Systems for Video Technology, vol. 22, no. 12, pp. 1649-1668, Dec. 2012.","A. Fuldseth, G. Bjøntegaard, and M. Budagavi, \"CE10: Core Transform Design for HEVC,\" JCTVC-G495, Nov. 2011.","J. Park, W. Nam, S. Han, and S. Lee, \"High Efficiency Video Coding(HEVC) 16x16 & 32x32 Inverse Transform IP Design for Large-Scale Displays\", Proceedings of International Technical Conference on Circuits/Systems, Computers, and Communications, pp. 153-155, Jun. 2011.","M. Budagavi, V. Sze, and M. Sadafale, \"Hardware analysis of transform and quantization,\" JCTVC-G132, Nov. 2011.","M. Budagavi and V. Sze, \"Unified Forward+Inverse Transform Architecture for HEVC\", Proceedings of IEEE International Conference on Image Processing, pp. 209-212, 2012.","J. Park, W. Nam, S. Han, and S. Lee, \"2-D Large Inverse Transform (16x16, 32x32) for HEVC (High Efficiency Video Coding)\", Journal of Semiconductor Technology and Science, vol. 12, no. 2, pp. 203-211, Jun. 2012."]}
- Published
- 2013
11. A Case Report of Tension Type Headache Patient with Dangkisoo-san and Acupuncture
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Woo-jin Nam, Dong-Il Park, You-gyung Kang, Myung-ho Jin, Yong-jae Yun, and Koang-Lok Kim
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medicine.medical_specialty ,business.industry ,Tension (physics) ,Anesthesia ,Acupuncture ,Medicine ,business ,Surgery - Published
- 2013
12. 21.2:Distinguished Paper: 55-inch OLED TV using InGaZnO TFTs with WRGB Pixel Design
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Bum-Sik Kim, Soo-Youle Cha, Byung-Chul Ahn, Kwan-Ho Park, Bong-Chul Kim, Jongsik Shim, Woo-Suk Ha, Hong-Jae Shin, Woo-Jin Nam, Honggyu Kim, Jinmog Kim, and Chang-Ho Oh
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Materials science ,Pixel ,business.industry ,Hardware_PERFORMANCEANDRELIABILITY ,Oxide thin-film transistor ,Power (physics) ,Threshold voltage ,Reliability (semiconductor) ,Thin-film transistor ,Hardware_INTEGRATEDCIRCUITS ,OLED ,Optoelectronics ,business ,Voltage - Abstract
In this paper, we suggest panel design schemes for large size OLED panel. With considerations on the reliability of oxide TFT, new pixel circuit is proposed to compensate threshold voltage shift of TFT and is designed in each WRGB sub-pixel. Also, the panel design concept for improving power supplying is explained. Low resistivity Cu metal is used to allow large panel current with uniformly supplying power voltage. 55-inch panel is successfully fabricated and demonstrated. Oxide TFT and white OLED with color layers are promising technologies for OLED TV.
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- 2013
13. 21.1:Invited Paper: Technological Progress and Commercialization of OLED TV
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Soo-Youle Cha, Sang-Deog Yeo, Byung-Chul Ahn, Chang-Ho Oh, Hong-Jae Shin, and Woo-Jin Nam
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Engineering ,Panel design ,Reliability (semiconductor) ,Backplane ,business.industry ,Technological change ,Scalability ,Electrical engineering ,OLED ,business ,Oxide thin-film transistor ,Commercialization - Abstract
World's first 55-inch OLED TV has been developed and recently launched mass production with excellent display image quality. We employ IGZO TFT backplane and white OLEDs with WRGB pixel design. Those technologies enable panel size scalability as well as mass production with lifetime reliability. For commercializing large-size OLED TV, the issues and challenges on panel design and driving, including LG Display's recent experience will be presented.
- Published
- 2013
14. 2-D Large Inverse Transform (16×16, 32×32) for HEVC (High Efficiency Video Coding)
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Woo-Jin Nam, Seongsoo Lee, Seung-Mok Han, and Jong-Sik Park
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Adder ,Computational complexity theory ,Computer science ,Processing element ,Electronic engineering ,Inverse ,Electrical and Electronic Engineering ,Reuse ,Electronic, Optical and Magnetic Materials ,Computational science ,Coding (social sciences) - Abstract
This paper proposes a 16×16 and 32×32 inverse transform architecture for HEVC (High Efficiency Video Coding). HEVC large transform of 16×16 and 32×32 suffers from huge computational complexity. To resolve this problem, we proposed a new large inverse transform architecture based on hardware reuse. The processing element is optimized by exploiting fully recursive and regular butterfly structure. To achieve low area, the processing element is implemented by shifters and adders without multiplier. Implementation of the proposed 2-D inverse transform architecture in 0.18 ㎛ technology shows about 300 ㎒ frequency and 287 Kgates area, which can process 4K (3840×2160)@ 30 fps image.
- Published
- 2012
15. Disseminated Mycobacterium avium Complex Infection in a Non-HIV-infected Patient Undergoing Continuous Ambulatory Peritoneal Dialysis
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Young Ju Cha, Jin-Won Chung, Su Hyun Kim, Woo Jin Nam, Hye Ryoun Kim, Dong Jin Oh, and Mi-Kyung Lee
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medicine.medical_treatment ,Clinical Biochemistry ,HIV Infections ,Polymerase Chain Reaction ,Peritoneal dialysis ,End stage renal disease ,Diagnosis, Differential ,Bacterial Proteins ,Peritoneal Dialysis, Continuous Ambulatory ,Bone Marrow ,Humans ,Medicine ,Fever of unknown origin ,Dialysis ,Aged ,Mycobacterium avium-intracellulare Infection ,biology ,business.industry ,Biochemistry (medical) ,Continuous ambulatory peritoneal dialysis ,Sequence Analysis, DNA ,General Medicine ,Mycobacterium avium Complex ,medicine.disease ,biology.organism_classification ,Anti-Bacterial Agents ,medicine.anatomical_structure ,Immunology ,Kidney Failure, Chronic ,Female ,Nontuberculous mycobacteria ,Bone marrow ,Differential diagnosis ,business ,Polymorphism, Restriction Fragment Length - Abstract
Isolated bone marrow infection by nontuberculous mycobacteria (NTM) is extremely rare. Recently, we encountered a case of bone marrow Mycobacterium avium complex (MAC) infection, which presented as a fever of unknown origin shortly after starting continuous ambulatory peritoneal dialysis (CAPD). The patient was diagnosed with MAC infection on the basis of PCR-restriction fragment length polymorphism analysis and sequencing of DNA obtained from bone marrow specimens. Although this was a case of severe MAC infection, there was no evidence of infection of other organs. End-stage renal disease (ESRD) patients undergoing dialysis can be considered immunodeficient; therefore, when these patients present with fever of unknown origin, opportunistic infections such as NTM infection should be considered in the differential diagnosis.
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- 2010
16. Pneumonia Caused by Fungus, Pneumocystis Jirovecii and Cytomegalovirus Coinfection in Patient with Renal Transplantation -A Case Report
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Su-Hyun Kim, Suk-Hee Yu, Tae-Young Kim, Kyung-Eun Lee, Woo-Jin Nam, Sun-Min Kim, Dong-Jin Oh, and Jung-ho Shin
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Transplantation ,medicine.medical_specialty ,biology ,business.industry ,Immunology ,medicine.disease_cause ,medicine.disease ,biology.organism_classification ,Organ transplantation ,End stage renal disease ,Pneumonia ,Superinfection ,Internal medicine ,parasitic diseases ,medicine ,Coinfection ,Pneumocystis jirovecii ,business ,Kidney transplantation - Abstract
Renal transplantation has become a well-established, definitive , highly successful therapy for end stage renal disease and been increased in previous decades. Korean Network for Organ Sharing reports that renal transplantation has been performed over 800 cases per year during five years. Although graft survival after renal transplantation has increased with the development of numerous new immunosupressive agents, infectious complications remain a significant cause of morbidity and mortality in renal transplant recipients.Cytomegalovirus (CMV) is a major virus in organ transplant recipients and is associated with opportunistic superinfection with a range of different microorganisms including Pneumocystis jirovecii, fungi, gram negative bacterias. In this paper, we report a case of pneumonia caused by fungus, Pneumocystis jirovecii, CMV in patient with renal transplantation. Based on the strong suspicion of superinfection, we aggressively diagnosed by performing surgical method and successfully treated the condition. Patients with CMV pneumonitis may be predisposed to superinfection by other pathogen and is associated with high mortality. Therefore, if superinfection is suspected, prompt diagnosis involving invasive methods and early initiation of antiviral, antifungal therapy are essential to reduce the mortality.
- Published
- 2009
17. A New Poly-Si TFT Current-Mirror Pixel for Active Matrix Organic Light Emitting Diode
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Yong-Min Ha, Byeong-Koo Kim, Min-Koo Han, Hong Seok Choi, Jae-Hoon Lee, and Woo-Jin Nam
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Materials science ,Pixel ,business.industry ,Electronic, Optical and Magnetic Materials ,Active matrix ,law.invention ,Threshold voltage ,Capacitor ,Optics ,AMOLED ,Current mirror ,Thin-film transistor ,law ,OLED ,Optoelectronics ,Electrical and Electronic Engineering ,business - Abstract
A new poly-Si thin-film-transistor (TFT) current-mirror-active-matrix-organic-light-emitting-diode (AMOLED) pixel, which successfully compensates for the variation of the threshold voltage as well as mobility in the excimer laser annealed poly-Si TFT pixel, is designed and fabricated. The OLED current (IOLED) of the proposed pixel does not depend on the operating temperature. When the temperature of pixel is increased from 27 degC to 60 degC, the I OLED of the new pixel circuit composed of four TFTs and one capacitor increases only about 1.5%, while that of a conventional pixel composed of two TFTs and one capacitor increases about 37%. At room temperature, nonuniformity of the IOLED in the proposed circuit was also considerably suppressed at around 9%. We have successfully fabricated a 1.2-in AMOLED panel (96times96timesred green blue) to evaluate the performance of the proposed pixel. A troublesome residual image caused by the hysteresis phenomenon of the poly-Si TFT was almost eliminated in the proposed AMOLED panel as a result of current programming
- Published
- 2006
18. Hysteresis phenomenon of hydrogenated amorphous silicon thin film transistors for an active matrix organic light emitting diode
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Jae-Hoon Lee, Min-Koo Han, Kwang-Sub Shin, and Woo-Jin Nam
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Amorphous silicon ,Materials science ,Silicon ,business.industry ,chemistry.chemical_element ,Condensed Matter Physics ,Oxide thin-film transistor ,Electronic, Optical and Magnetic Materials ,Active matrix ,law.invention ,Hysteresis ,chemistry.chemical_compound ,AMOLED ,chemistry ,Thin-film transistor ,law ,Materials Chemistry ,Ceramics and Composites ,OLED ,Optoelectronics ,business - Abstract
We have investigated an origin of hysteresis of hydrogenated amorphous silicon thin film transistor (a-Si:H TFT) and analyzed an effect of hysteresis when a-Si:H TFT is a pixel element of active matrix organic light emitting diode (AMOLED). When a-Si:H TFT is placed under different starting gate-voltages, such as 10 and 5 V, the measured transfer characteristics with 1 μA at VDS = 10 V shows that the gate-voltage shift of 0.15 V occurs due to the different quantities of trapped charge. When the step gate-voltage in the transfer curve is decreased from 0.5 to 0.05 V, the gate-voltage shift is decreased from 0.78 to 0.39 V due to the change of charge de-trapping rate. The measured OLED current in the widely used 2-TFT pixel shows that the gate-voltage of TFT in the previous frame can influence OLED current in the present frame by ±35% due to the change of interface trap density induced by different starting gate-voltages.
- Published
- 2006
19. Novel L-Shaped Dual-Gate Structure of Polycrystalline Silicon Thin-Film Transistors for the Reduction of the Kink Current in Sequential Lateral Solidification or Continuous Wave Laser Method
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Hyejin Lee, Sang−Hoon Jung, Woo−Jin Nam, Hee−Sun Shin, Won-Kyu Lee, and Min-Koo Han
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Materials science ,Physics and Astronomy (miscellaneous) ,business.industry ,Transistor ,General Engineering ,General Physics and Astronomy ,engineering.material ,law.invention ,Grain growth ,Polycrystalline silicon ,Saturation current ,Thin-film transistor ,law ,engineering ,Continuous wave ,Optoelectronics ,Grain boundary ,business ,Saturation (magnetic) - Abstract
An L-shaped dual-gate device structure, which reduces kink current in polycrystalline silicon thin-film transistors (poly-Si TFTs), has been proposed and fabricated. In the proposed device, the poly-Si TFTs have a lateral grain growth in channels such as TFTs fabricated by sequential lateral solidification (SLS) or CW laser crystallization. The current flow of dual TFTs is strongly affected by grain boundaries showing lateral grain growth. The L-shaped dual gate structure is employed for asymmetry between dual channels. One of the channels is located in a parallel direction of grain growth and the other is located vertically. It is verified by experiment that the proposed L-shaped dual-gate TFT reduced the kink current of poly-Si TFT and showed improved reliability by fixed current flow in the saturation mode.
- Published
- 2006
20. New Current-Scaling Pixel Circuit Compensating Non uniform Electrical Characteristics for Active Matrix Organic Light Emitting Diode
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Chang Dong Kim, Hee−Sun Shin, Jae-Hoon Lee, Chang−Yeon Kim, Woo−Jin Nam, and Min-Koo Han
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Materials science ,Physics and Astronomy (miscellaneous) ,business.industry ,General Engineering ,General Physics and Astronomy ,Threshold voltage ,Active matrix ,law.invention ,Current mirror ,Thin-film transistor ,law ,OLED ,Optoelectronics ,business ,Voltage drop ,Diode ,Voltage - Abstract
We have proposed and successfully fabricated a new serial current mirror pixel design for an active-matrix organic light-emitting diode which consists of four polycrystalline silicon thin-film transistors (poly-Si TFTs) and one capacitor. The non uniformity of OLED current (IOLED) due to the nature of a poly-Si TFT is considerably suppressed. Our experimental results show that the non uniformity of IOLED due to threshold voltage and mobility variation is around 7% whereas that of IOLED is about 25% in the conventional 2-TFT pixel. When supply voltage decreases from 10 V to 9.5 V, the non uniformity of OLED current is suppressed to 2.2% whereas that of OLED current is 35% in the 2-TFT pixel. The proposed pixel can successfully compensate the variation of the electrical characteristics of the poly-Si TFTs as well as provide uniform OLED current despite the supply voltage drop.
- Published
- 2006
21. High-Aperture Pixel Design EmployingVDDLine Elimination for Active Matrix Organic Light Emitting Diode Display
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Hyejin Lee, Min-Koo Han, Chang−Yeon Kim, Jae-Hoon Lee, and Woo−Jin Nam
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Materials science ,Physics and Astronomy (miscellaneous) ,Pixel ,business.industry ,Aperture ,Transistor ,General Engineering ,General Physics and Astronomy ,engineering.material ,Cathode ,Active matrix ,law.invention ,AMOLED ,Polycrystalline silicon ,law ,engineering ,OLED ,Optoelectronics ,business - Abstract
High-aperture ratio pixel design employing polycrystalline silicon thin-film transistors (poly-Si TFTs) for active matrix organic light emitting diode (AMOLED) displays is proposed. The VDD supply line in each pixel is eliminated and the gate scan line is utilized as a VDD supply so that the pixel aperture ratio is increased considerably. The increased emission area achieves low current density through OLED, thus the troublesome OLED luminance degradation would be suppressed and the life-time of OLED materials may be increased. In order to implement the proposed pixel driving, a new fabrication process for the storage capacitor (CST) which uses indium–tin oxide (ITO) and the cathode layers is presented.
- Published
- 2006
22. Kink Suppression Improvement of Polycrystalline Silicon Thin-Film Transistors Employing Asymmetric Dual-Gate Design
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Hee−Sun Shin, Sang−Hoon Jung, Woo−Jin Nam, Min-Koo Han, and Ji Hoon Kim
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Materials science ,Physics and Astronomy (miscellaneous) ,business.industry ,Transistor ,General Engineering ,General Physics and Astronomy ,engineering.material ,Oxide thin-film transistor ,law.invention ,Stress (mechanics) ,Computer Science::Hardware Architecture ,Computer Science::Emerging Technologies ,Reliability (semiconductor) ,Polycrystalline silicon ,AMOLED ,law ,Thin-film transistor ,engineering ,Optoelectronics ,lipids (amino acids, peptides, and proteins) ,Current (fluid) ,business - Abstract
Polycrystalline silicon thin-film transistors (poly-Si TFTs) with an asymmetric dual-gate, consisting of a long-gate TFT and a short-gate TFT in series, suppress kink current and increase output resistance. The long-gate TFT operates in a linear regime and confines the total current flow by its current operation region. The entire device does not suffer from kinks in spite of a high drain bias. Experimental results show that an asymmetric design of the dual-gate structure improves kink-free characteristics compared with conventional single- and dual-gate TFTs. The hot-carrier stress reliability of the short-gate TFT is not severely degraded due to kink current suppression.
- Published
- 2006
23. New voltage programming LTPS‐TFT pixel scaling down VTH variation for AMOLED display
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Min-Koo Han, Woo-Jin Nam, Hee-Sun Shin, Jae-Hong Jeon, and Jae-Hoon Lee
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Materials science ,Pixel ,business.industry ,Electrical engineering ,Capacitance ,Compensation (engineering) ,law.invention ,Capacitor ,AMOLED ,Thin-film transistor ,law ,Optoelectronics ,General Materials Science ,Electrical and Electronic Engineering ,business ,Voltage drop ,Voltage - Abstract
A new voltage‐scaled compensation pixel which employs 3 p‐type poly‐Si TFTs and 2 capacitors without additional control line has been proposed and verified. The proposed pixel does not employ the VTH memorizing and cancellation, but scales down the inevitable VTH variation of poly‐Si TFT. Also the troublesome narrow input range of VDATA is increased and the VDD supply voltage drop is suppressed. In our experimental results, the OLED current error is successfully compensated by easily controlling the proposed voltage scaling effects.
- Published
- 2006
24. A poly-Si thin film transistor fabricated by new excimer laser recrystallization employing floating active structure
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In-Hyuk Song, Woo-Jin Nam, Cheon-Hong Kim, and Min-Koo Han
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Materials science ,Active structure ,Excimer laser ,business.industry ,medicine.medical_treatment ,General Physics and Astronomy ,Recrystallization (metallurgy) ,engineering.material ,Laser ,law.invention ,Polycrystalline silicon ,Thin-film transistor ,law ,engineering ,medicine ,Optoelectronics ,General Materials Science ,Process window ,Irradiation ,business - Abstract
We fabricated a high-performance polycrystalline silicon (poly-Si) thin film transistor (TFT) by new excimer laser annealing (ELA) method employing floating active structure. The new simple ELA method produces large lateral grains exceeding 4 μm. A novel poly-Si TFT that exhibits very high mobility (μFE=331 cm2/V s) and low leakage current has been successfully fabricated by single laser irradiation on selectively floating a-Si layer. Uniform lateral grains have been obtained with wide ELA process window.
- Published
- 2002
25. Excimer laser recrystallization of selectively floating a-Si thin film
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In-Hyuk Song, Cheon-Hong Kim, Woo-Jin Nam, and Min-Koo Han
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Materials science ,Excimer laser ,business.industry ,medicine.medical_treatment ,food and beverages ,Recrystallization (metallurgy) ,Condensed Matter Physics ,Laser ,Grain size ,Electronic, Optical and Magnetic Materials ,Active layer ,law.invention ,Grain growth ,Thermal conductivity ,Optics ,law ,Materials Chemistry ,Ceramics and Composites ,medicine ,Optoelectronics ,Thin film ,business - Abstract
We report a new excimer laser annealing (ELA) method which increases the grain size of poly-Si film considerably by employing a selectively floating a-Si active layer structure. An air-gap, with low thermal conductivity, blocks the heat conduction to the underlying substrate in the floating a-Si region so that the lateral temperature gradient, which is responsible for a lateral grain growth, is successfully induced by the proposed simple air-gap structure. Our experimental result shows that large grains were grown in the lateral direction from the edge to the center of the floating active region. The large lateral grains exceeding 4 μm were successfully obtained with only one laser irradiation and uniform lateral grains have been grown with a wide laser annealing process window.
- Published
- 2002
26. Low-Voltage Driven P-Type Polycrystalline Silicon Thin-Film Transistor Integrated Gate Driver Circuits for Low-Cost Chip-on-Glass Panel
- Author
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Sang−Geun Park, Woo−Jin Nam, Hee−Sun Shin, Hyejin Lee, and Min-Koo Han
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Materials science ,Physics and Astronomy (miscellaneous) ,business.industry ,Transistor ,General Engineering ,General Physics and Astronomy ,Hardware_PERFORMANCEANDRELIABILITY ,engineering.material ,law.invention ,Polycrystalline silicon ,law ,Thin-film transistor ,Hardware_INTEGRATEDCIRCUITS ,Gate driver ,engineering ,Charge pump ,Optoelectronics ,Field-effect transistor ,business ,Low voltage ,Electronic circuit - Abstract
P-type low-temperature polycrystalline silicon (LTPS) thin-film transistor (TFT) integrated driver circuits are proposed for low-cost chip-on-glass (COG) panel. In order to reduce the process cost of panel, gate driver employing level-shifter, shift register and DC–DC converter is integrated by p-type polycrystalline silicon (poly-Si) TFTs. The gate drivers are composed of the level-up and level-down voltage shifters and the robust two-clock shift registers. The DC–DC converters are designed using diode-connected type charge pumps and regulators. The proposed p-type circuits were verified successfully by the simulations and the measurements.
- Published
- 2006
27. A new analog buffer using P-type poly-Si TFTs for active matrix displays
- Author
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Sang-Hoon Jung, Jae-Hoon Lee, Woo-Jin Nam, and Min-Koo Han
- Subjects
Materials science ,Input offset voltage ,Subthreshold conduction ,business.industry ,Electrical engineering ,Hardware_PERFORMANCEANDRELIABILITY ,Electronic, Optical and Magnetic Materials ,PMOS logic ,law.invention ,Threshold voltage ,Capacitor ,AMOLED ,Thin-film transistor ,law ,Hardware_INTEGRATEDCIRCUITS ,Electrical and Electronic Engineering ,business ,Electronic circuit - Abstract
A new simple analog buffer employing p-type low-temperature poly-Si thin-film transistors (TFTs) are proposed and fabricated for the integrated data driving circuits of AMLCD and AMOLED. The new analog buffer does not use any capacitors to store the threshold voltage of a poly-Si TFT, so that it could reduce the output offset by the subthreshold current of poly-Si TFT. The simulation and experimental result exhibit that the buffer output successfully charges the buffer load (/spl sim/20 pF) to the input value quickly by the boot-strapping. The measured output offset voltages are less than /spl plusmn/70 mV when the input varies from 1 to 10 V.
- Published
- 2006
28. A new low-power pMOS poly-Si inverter for AMDs
- Author
-
Jae-Hoon Lee, Sang-Hoon Jung, Min-Koo Han, Woo-Jin Nam, and Jae-Hong Jeon
- Subjects
Capacitive coupling ,Materials science ,business.industry ,Transistor ,Electrical engineering ,Electronic, Optical and Magnetic Materials ,law.invention ,Active matrix ,PMOS logic ,law ,MOSFET ,Optoelectronics ,Inverter ,Electrical and Electronic Engineering ,business ,Diode ,Electronic circuit - Abstract
A new low-power inverter using only p-type poly-Si thin-film transistors for the driving circuits of active matrix liquid crystal displays and active matrix organic light-emitting diodes is proposed and fabricated. The proposed pMOS inverter using capacitive coupling and bootstrapping successfully eliminated the troublesome through current and exhibited a wide output swing from V/sub DD/ to V/sub SS/ without additional signals.
- Published
- 2005
29. Clinical and cost-effectiveness of collaborative traditional Korean and Western medicine treatment for low back pain: A protocol for a prospective observational exploratory study.
- Author
-
Eun Hye Hyun, Hye-Yoon Lee, Hye Won Kim, Hyun Min Kim, Eun Jung Kim, Seon Jong Kim, Yoon Gyung Song, Young Il Kim, Woo Jin Nam, Dong Hyung Seo, Sang Ho Lee, NamKwen Kim, Hyun, Eun Hye, Lee, Hye-Yoon, Kim, Hye Won, Kim, Hyun Min, Kim, Eun Jung, Kim, Seon Jong, Song, Yoon Gyung, and Kim, Young Il
- Published
- 2018
- Full Text
- View/download PDF
30. A New Voltage-Modulated AMOLED Pixel Design Compensating for Threshold Voltage Variation in Poly-Si TFTs
- Author
-
Sang-Hoon Jung, Woo-Jin Nam, and Min-Koo Han
- Subjects
Materials science ,business.industry ,Circuit design ,Spice ,ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION ,Hardware_PERFORMANCEANDRELIABILITY ,Electronic, Optical and Magnetic Materials ,Active matrix ,law.invention ,Threshold voltage ,AMOLED ,law ,Hardware_INTEGRATEDCIRCUITS ,Electronic engineering ,OLED ,Optoelectronics ,Electrical and Electronic Engineering ,business ,Diode ,Voltage - Abstract
A new voltage-modulated active-matrix organic light-emitting diode (AMOLED) pixel design, which successfully compensates for the threshold voltage variations in poly-Si thin-film transitors (TFTs), is proposed, and verified by SPICE simulation and experiments. In order to compensate for variations in OLED current, the proposed pixel design employs a new voltage modulation scheme using diode connections.
- Published
- 2004
31. A New Current Scaling Pixel Circuit for AMOLED
- Author
-
Sang-Hoon Jung, Woo-Jin Nam, Min-Koo Han, and Jae-Hoon Lee
- Subjects
Materials science ,business.industry ,Transistor ,Electronic, Optical and Magnetic Materials ,law.invention ,Threshold voltage ,Capacitor ,AMOLED ,Current mirror ,Thin-film transistor ,law ,OLED ,Electronic engineering ,Optoelectronics ,Electrical and Electronic Engineering ,business ,Diode - Abstract
A new active-matrix organic light-emitting diode (AMOLED) pixel design, composed of four polycrystalline silicon thin-film transistor (poly-Si TFT) and one capacitor, is proposed by employing a novel current scaling scheme. The simulation results, based on the measured characteristics of an OLED and poly-Si TFTs, show that the proposed pixel design would scale down the data current more effectively, so as to guarantee a lower charging time compared with the conventional current mirror structure, as well as successfully compensate the variation of the electrical characteristics of the poly-Si TFTs, such as the threshold voltage and mobility.
- Published
- 2004
32. A high-performance multichannel dual-gate poly-Si TFT fabricated by excimer laser irradiation on a floating a-Si thin film
- Author
-
Su-Hyuk Kang, Woo-Jin Nam, In-Hyuk Song, and Min-Koo Han
- Subjects
Electron mobility ,Materials science ,Silicon ,business.industry ,Transistor ,chemistry.chemical_element ,Subthreshold slope ,Electronic, Optical and Magnetic Materials ,law.invention ,Grain growth ,chemistry ,law ,Thin-film transistor ,Electronic engineering ,Optoelectronics ,Grain boundary ,Electrical and Electronic Engineering ,Thin film ,business - Abstract
A new excimer laser annealing (ELA) process that uses a floating amorphous-Silicon (a-Si) thin film with a multichannel structure is proposed for high-performance poly-Si thin-film transistors (TFTs). The proposed ELA method produces two-dimensional (2-D) grain growth, which can result in a high-quality grain structure. The dual-gate structure was employed to eliminate the grain boundaries perpendicular to the current flow in the channel. A multichannel structure was adapted in order to arrange the grain boundary to be parallel to the current flow. The proposed poly-Si TFT exhibits high-performance electrical characteristics, which are a high mobility of 504 cm/sup 2//Vsec and a low subthreshold slope of 0.337 V/dec.
- Published
- 2003
33. A poly-Si TFT fabricated by excimer laser recrystallization on floating active structure
- Author
-
In-Hyuk Song, Cheon-Hong Kim, Woo-Jin Nam, and Min-Koo Han
- Subjects
Amorphous silicon ,Electron mobility ,Materials science ,Silicon ,Excimer laser ,business.industry ,medicine.medical_treatment ,chemistry.chemical_element ,Recrystallization (metallurgy) ,engineering.material ,Electronic, Optical and Magnetic Materials ,chemistry.chemical_compound ,Polycrystalline silicon ,Thermal conductivity ,chemistry ,Thin-film transistor ,medicine ,engineering ,Electronic engineering ,Optoelectronics ,Electrical and Electronic Engineering ,business - Abstract
This letter reports a. new excimer laser annealing (ELA) method to produce large polycrystalline silicon (poly-Si) lateral grains exceeding 4 /spl mu/m. A selectively floating amorphous silicon (a-Si) flint with a 50 nm-thick air-gap was irradiated by a single-pulse XeCl excimer laser and uniform lateral grains were grown due to the lateral thermal gradient caused by the low thermal conductivity of the air. A poly-Si thin-film transistor (TFT) with two high-quality 4.6 /spl mu/m-long lateral grains was fabricated by employing the proposed ELA and high field-effect mobility of 331 cm/sup 2//Vsec was obtained due to. the high-quality grain structure.
- Published
- 2002
34. A poly-Si TFT integrated gate-data line-crossover structure employing an air-gap for large-size AMLCD panel
- Author
-
In-Hyuk Song, Min Cheol Lee, Jin-Woo Park, Min-Koo Han, and Woo-Jin Nam
- Subjects
Liquid-crystal display ,Materials science ,Opacity ,Silicon ,business.industry ,Electrical engineering ,chemistry.chemical_element ,Hardware_PERFORMANCEANDRELIABILITY ,Dielectric ,Active-matrix liquid-crystal display ,Capacitance ,Electronic, Optical and Magnetic Materials ,law.invention ,chemistry ,law ,Thin-film transistor ,Hardware_INTEGRATEDCIRCUITS ,Optoelectronics ,Electrical and Electronic Engineering ,business ,Air gap (plumbing) - Abstract
We have fabricated a novel poly-Si TFT integrated at the gate-data line-crossover structure without sacrificing the electrical characteristics. The aperture ratio of the panel was increased considerably because the TFT was located under the opaque metal line. In particular, we employed a low dielectric air-gap between the gate line and data lines, which reduced capacitance between the gate and data lines, enabling the signal delay of the data line to be significantly decreased. The fabricated TFT was successfully operated, and the proposed structure found to reduce the delay time by a factor of nine compared with conventionally constructed panel without air-bridges.
- Published
- 2001
35. A Case of Acute Kidney Injury Associated with Rhabdomyolysis after Liposuction
- Author
-
Min Jee Han, Woo Jin Nam, Moon Ki Hong, Chae Rim Kim, Su Hyun Kim, and Do Hyoung Kim
- Subjects
Nephrology ,medicine.medical_specialty ,business.industry ,Liposuction ,medicine.medical_treatment ,Internal medicine ,General surgery ,medicine ,Acute kidney injury ,Creative commons ,business ,medicine.disease ,Rhabdomyolysis - Abstract
Correspondence to Do Hyoung Kim, M.D. Division of Nephrology, Department of Internal Medicine, Chung-Ang University College of Medicine, 102 Heukseok-ro, Dongjak-gu, Seoul 156-755, Korea Tel: +82-2-6299-3437, Fax: +82-2-6263-2184, E-mail: dhkim6489@hanmail.net Copyrightc 2015 The Korean Association of Internal Medicine This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted noncommercial use, distribution, and reproduction in any medium, provided the original work is properly cited. 지방흡인술 시술과 관련된 횡문근융해증에 의한 급성 신손상 1예
- Published
- 2015
36. Highly efficient current scaling AMOLED panel employing a new current mirror pixel circuit fabricated by excimer laser annealed poly-Si TFTs
- Author
-
Soon-Kwang Hong, Hee-Sun Shin, Woo-Jin Nam, Min-Koo Han, Yong-Min Ha, Hong Seok Choi, Chang-Hwan Lee, and Jae-Hoon Lee
- Subjects
Materials science ,Excimer laser ,Pixel ,business.industry ,medicine.medical_treatment ,Luminance ,AMOLED ,Current mirror ,Thin-film transistor ,medicine ,OLED ,Optoelectronics ,Grain boundary ,business - Abstract
We propose and fabricate highly efficient current scaling AMOLED panel employing excimer laser annealed poly-Si TFTs, which successfully compensate the non-uniformity of IOLED due to the grain boundaries and residual image caused by a hysteresis phenomenon in poly-Si TFT. The proposed 2.4 inch panel employing a new current mirror pixel circuit successfully reduces a nonuniformity of the luminance from 41% to 9.1%, and eliminates residual image, compared with conventional 2-TFT pixel array. The proposed pixel circuit can also increase the data current by 57% and decrease the pixel charging time by 21%, compared with a traditional current mirror pixel
- Published
- 2006
37. An Asymmetric Dual Gate Poly-Si TFTs for Improving Hot Carrier Stress Stability and Kink Effect Suppression
- Author
-
Woo−Jin Nam, Joong Hyun Park, Jae-Hoon Lee, and Min-Koo Han
- Subjects
Materials science ,business.industry ,Dual gate ,Hot carrier stress ,Stability (probability) ,Stress (mechanics) ,Computer Science::Hardware Architecture ,Computer Science::Emerging Technologies ,Reliability (semiconductor) ,Thin-film transistor ,Electric field ,Optoelectronics ,Current (fluid) ,business - Abstract
An asymmetric dual gate poly-Si thin film transistors (TFTs), which is consist a long-gate TFT and a short-gate TFT, were fabricated in order to suppress the kink current and increase the reliability. The long-gate TFT operates in a linear regime and limits the total current flow by its current operation region. The asymmetric dual-gate does not exhibit from the kink current in a high drain bias due to the distribution of lateral electric field. The asymmetric dual-gate structure improves kink-free characteristics compared with conventional single and dual-gate TFTs. The hot-carrier stress reliability is successfully improved due to kink current suppression.
- Published
- 2006
38. Gate Overlapped Lightly Doped Drain Poly-Si TFTs Employing 45° Tilt Implant For Source and Drain
- Author
-
Min-Koo Han, Hee-Sun Shin, Woo-Jin Nam, Moon-Young Shin, and Jae-Hoon Lee
- Subjects
Stress (mechanics) ,Tilt (optics) ,Materials science ,Ion doping ,business.industry ,Thin-film transistor ,Doping ,Optoelectronics ,business - Abstract
We propose a short channel gate overlapped lightly doped drain (GOLDD) poly-Si TFT employing 45° tilt implant for source and drain (S/D) regions without any additional ion doping or mask. Oblique-incident ELA activation is performed to activate both n+ S/D and n- LDD regions as well as cure junction defects. The proposed poly-Si TFT can suppress the anomalous leakage current, and exhibit the better reliability against the hot-carrier stress.
- Published
- 2004
39. A new multi-channel dual-gate poly-Si TFT employing excimer laser annealing recrystallization on pre-patterned a-Si thin film
- Author
-
In-Hyuk Song, Cheon-Hong Kim, Su-Hyuk Kang, A.K. Han, and Woo-Jin Nam
- Subjects
Electron mobility ,Materials science ,Silicon ,business.industry ,chemistry.chemical_element ,Recrystallization (metallurgy) ,Subthreshold slope ,Grain growth ,chemistry ,Thin-film transistor ,Electronic engineering ,Optoelectronics ,Grain boundary ,Thin film ,business - Abstract
We have proposed a new excimer laser annealing method which employs a floating a-Si thin film structure and the effect of pre-patterning. The proposed ELA produces two-dimensional grain growth so that a high quality grain structure can be obtained. We have also fabricated poly-Si TFTs by adapting the proposed ELA method. The dual-gate structure is used for the elimination of grain boundaries in the channel. The proposed poly-Si TFT exhibits high performance electrical characteristics, e.g. a high mobility of 504 cm/sup 2//V sec and low subthreshold slope of 0.337 V/dec.
- Published
- 2003
40. Observation and Annealing of Incomplete Recrystallized Junction Defects due to the Excimer Laser Beam Diffraction at the Gate Edge in Poly-Si TFT
- Author
-
Sang-Hoon Jung, Woo-Jin Nam, Min-Koo Han, Kee-Chan Park, and Soo-Jeong Park
- Subjects
Diffraction ,Materials science ,Excimer laser ,business.industry ,Annealing (metallurgy) ,medicine.medical_treatment ,engineering.material ,Laser ,law.invention ,Polycrystalline silicon ,law ,Transmission electron microscopy ,Thin-film transistor ,Electrode ,engineering ,medicine ,Optoelectronics ,business - Abstract
Incomplete recrystallized junction defects of self-aligned, excimer laser annealed polycrystalline silicon (poly-Si) thin film transistor (TFT) was investigated by high-resolution transmission electron microscopy (HR-TEM). TEM observation and simulation result verify that the laser irradiation intensity decreased remarkably at the junction due to diffraction of laser beam at gate electrode edge. We proposed oblique-incidence excimer laser annealing method and successfully eliminated the residual junction defects.
- Published
- 2003
41. 2-Dimensional Controlled Large Lateral Grain Growth on the Floating Amorphous Silicon Film by Excimer Laser Recrystallization
- Author
-
Woo-Jin Nam, In-Hyuk Song, Min-Koo Han, and Su-Hyuk Kang
- Subjects
Materials science ,Excimer laser ,medicine.medical_treatment ,Nanocrystalline silicon ,Recrystallization (metallurgy) ,Laser ,law.invention ,Grain growth ,Temperature gradient ,Thermal conductivity ,law ,medicine ,Grain boundary ,Composite material - Abstract
We have successfully obtained large lateral grains with well-controlled grain boundary. The proposed excimer laser annealing (ELA) method produces 2-dimensionally controlled grain growth because the temperature gradient is induced in two directions. Along the channel direction, the floating active structure produces large thermal gradient due to very low thermal conductivity of the air-gap. Along the perpendicular direction to the channel, the surface tension effect also produces thermal gradient. The proposed ELA method can control the grain boundary perpendicular and parallel to current path with only one laser irradiation.
- Published
- 2003
42. Residual Ion Implantation Damage at Source/Drain Junctions of Excimer Laser Annealed Polycrystalline Silicon Thin Film Transistor
- Author
-
Min-Koo Han, Woo-Jin Nam, Kee-Chan Park, and Jae-Shin Kim
- Subjects
Materials science ,Excimer laser ,Silicon ,business.industry ,medicine.medical_treatment ,chemistry.chemical_element ,engineering.material ,Polycrystalline silicon ,Ion implantation ,chemistry ,Transmission electron microscopy ,Thin-film transistor ,Electrode ,medicine ,engineering ,Optoelectronics ,business ,Layer (electronics) - Abstract
Residual ion implantation damage at source/drain junctions of excimer laser annealed polycrystalline silicon (poly-Si) thin film transistor (TFT) was investigated by high-resolution transmission electron microscopy (HR-TEM). Cross-sectional TEM observation showed that XeCl excimer laser (λ=308 nm) energy decreased considerably at the source/drain junctions of top-gated poly-Si TFT due to laser beam diffraction at the gate electrode edges and that the silicon layer amorphized by ion implantation, was not completely annealed at the juncions. The HR-TEM observation showed severe lattice disorder at the junctions of poly-Si TFT.
- Published
- 2002
43. A New Self-Aligned Poly-Si Tft Employing a Pre-Patterned Al Mask Layer by Backside Exposure Technique
- Author
-
Woo-Jin Nam, Min-Koo Han, Kee-Chan Park, Jae-Hoon Lee, and Min-Cheol Lee
- Subjects
Materials science ,business.industry ,chemistry.chemical_element ,Exposure technique ,Photoresist ,Microbiology ,Grain growth ,chemistry ,Thin-film transistor ,Aluminium ,Transmittance ,Optoelectronics ,Grain boundary ,business ,Layer (electronics) - Abstract
A new self-aligned poly-Si TFT has been fabricated by employing a photoresist backside exposure technique. A pre-patterned aluminum (Al) layer on a-Si film not only induces the lateral grain growth (∼1.6 μm) in excimer laser crystallization but also implements the selfalignment of the gate region with the lateral grain region. Photoresist backside exposure through poly-Si film has been successfully performed because crystallized poly-Si has a fairly high UV transmittance. A self-aligned poly-Si TFT with a single grain boundary within the 2 μm channel was successfully fabricated and high on/off current ratio (∼107) was obtained.
- Published
- 2002
44. Role of IL-1α in Cisplatin-Induced Acute Renal Failure in Mice
- Author
-
Min-Jee Han, Jin-Gun Kim, Hye-Ryoun Kim, Jung-ho Shin, Su-Hyun Kim, Jay-Wook Lee, Dong-Jin Oh, and Woo-Jin Nam
- Subjects
medicine.medical_specialty ,Time Factors ,Integrin alpha2 ,Fluorescent Antibody Technique ,Apoptosis ,Mice, Transgenic ,Kidney ,Blood Urea Nitrogen ,Mice ,Necrosis ,Interleukin-1alpha ,Internal medicine ,medicine ,Animals ,Cisplatin ,CD11b Antigen ,biology ,business.industry ,Macrophages ,Significant difference ,Acute kidney injury ,Interleukin ,Acute Kidney Injury ,Natural killer T cell ,medicine.disease ,Killer Cells, Natural ,Mice, Inbred C57BL ,Disease Models, Animal ,Endocrinology ,Neutrophil Infiltration ,Integrin alpha M ,Creatinine ,Immunology ,biology.protein ,Natural Killer T-Cells ,Original Article ,business ,Infiltration (medical) ,Biomarkers ,medicine.drug - Abstract
Background/Aims For unknown reasons, caspase-1 -/- mice, protected against cisplatin-induced acute renal failure (ARF), are deficient in interleukin (IL)-1α. We thus asked whether IL-1α deficiency underlies the mechanism of protection against cisplatin-induced ARF in these mice. Methods Cisplatin (30 mg/kg) was injected intraperitoneally into wild-type C57BL/6 mice to produce a cisplatin-induced model of ARF. IL-1α was measured in control vehicle- and cisplatin-treated wild-type animals. We also examined whether IL-1α -/- mice were similarly protected against cisplatin-induced ARF. Additionally, infiltration of CD11b- and CD49b-positive cells, as markers of macrophages, natural killer, and natural killer T cells (pan-NK cells), was investigated in wild-type and IL-1α -/- mice. Results Compared with vehicle-treated mice, renal IL-1α increased in cisplatin-treated wild-type mice beginning on day 1. IL-1α -/- mice were shown to be protected against cisplatin-induced ARF. No significant difference in the infiltration of neutrophils or CD11b- and CD49b-positive cells were observed between wild-type and IL-1α -/- mice. Conclusions Mice deficient in IL-1α are protected against cisplatin-induced ARF. The lack of IL-1α may explain, at least in part, the protection against cisplatin-induced ARF observed in caspase-1 -/- mice. Investigation of the protective mechanism (s) in IL-1α -/- mice in cisplatin-induced ARF merits further study.
- Published
- 2011
45. 3.2: Distinguished Paper: 15-inch XGA Dual-Plate OLED Display (DOD) Based on Amorphous Silicon (a-Si) TFT Backplane
- Author
-
In Byeong Kang, Chang-Wook Han, In Jae Chung, Moon‐Ky Lee, Woo-Jin Nam, Yoon-Heung Tak, Ock‐Hee Kim, and Sung-Joon Bae
- Subjects
Amorphous silicon ,Materials science ,business.industry ,Electrical engineering ,Aperture ratio ,Anode ,chemistry.chemical_compound ,AMOLED ,Backplane ,chemistry ,Thin-film transistor ,OLED ,Optoelectronics ,business ,Luminescence - Abstract
We report the improved AMOLED with a-Si TFT backplane based on our unique structure. Our new structure use the encapsulation glass as a substrate for OLED which enable us to achieve the high aperture ratio, large TFT area, high luminescence uniformity, and low anode resistance.
- Published
- 2008
46. A Top-Emitting Organic Light-Emitting Diode Employing a Top-Cathode Connected to Amorphous Silicon TFTs
- Author
-
In Byeong Kang, Chang-Wook Han, Min-Koo Han, Woo-Jin Nam, and Sung-Joon Bae
- Subjects
Amorphous silicon ,Materials science ,Renewable Energy, Sustainability and the Environment ,business.industry ,Transistor ,Condensed Matter Physics ,Cathode ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,law.invention ,Anode ,chemistry.chemical_compound ,AMOLED ,chemistry ,law ,Thin-film transistor ,Materials Chemistry ,Electrochemistry ,OLED ,Optoelectronics ,business ,Diode - Abstract
An active-matrix organic light-emitting diode (AMOLED) display employing hydrogenated amorphous silicon thin-film transistor (TFT) prefers a cathode-contact structure rather than an anode-contact structure. In this paper, a normal top-emitting OLED (TOLED) employing cathode-contact structure has been proposed. The TOLED employing a thin Cr and a highly reflective AlNd alloy as an anode was fabricated. The current efficiency of AlNd alloy with 3 nm thick Cr as a hole-injection layer could be improved to a level of 6.3 cdA due to a highly reflective anode. In order to implement the normal TOLED structure, the cathode layer on top is separated as subpixels by negative photoresist separator. The AMOLED employing cathode-contact structure shows longer lifetime compared to that,employing anode-contact structure.
- Published
- 2007
47. Peripheral circuit designs using low-temperature p-type poly-Si thin-film transistors
- Author
-
Hee-Sun Shin, Min-Koo Han, Hyejin Lee, Jae-Hoon Lee, and Woo-Jin Nam
- Subjects
Offset (computer science) ,Materials science ,business.industry ,Hardware_PERFORMANCEANDRELIABILITY ,Logic level ,Atomic and Molecular Physics, and Optics ,Buffer (optical fiber) ,Electronic, Optical and Magnetic Materials ,Thin-film transistor ,Hardware_INTEGRATEDCIRCUITS ,Optoelectronics ,Digital interface ,Electrical and Electronic Engineering ,business ,Computer hardware ,Electronic circuit ,Voltage ,Shift register - Abstract
— P-type low-temperature (450°C) polycrystalline-silicon thin-film-transistor circuits for peripheral driver integration in active-matrix displays are proposed and verified. A low-voltage (5 V) driven poly-Si scan driver is designed by employing a level shifter and shift register. A source driver for six-bit digital interface is proposed, and the building blocks such as latch, DAC, and analog buffer are described. The latch samples and holds the digital bits (D and D') without an output voltage loss. A new source-follower type analog buffer is developed and exhibits a small offset deviation regardless of the VTH variation of the buffer TFT. The simulation and measurement results ensure that the proposed circuits were successfully designed for p-type panel integration.
- Published
- 2006
48. A new current-mirror pixel circuit employing poly-Si TFTs for active-matrix organic light-emitting-diode displays
- Author
-
Min-Koo Han, Hong Soon Kwang, Hee-Sun Shin, Chang-Hwan Lee, Hong-Seok Choi, Yong-Min Ha, Woo-Jin Nam, and Jae-Hoon Lee
- Subjects
Materials science ,Pixel ,business.industry ,engineering.material ,Luminance ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,Active matrix ,law.invention ,Polycrystalline silicon ,AMOLED ,Optics ,Current mirror ,law ,Thin-film transistor ,engineering ,OLED ,Optoelectronics ,Electrical and Electronic Engineering ,business - Abstract
— A novel active-matrix organic light-emitting-diode (AMOLED) display employing a new current-mirror pixel circuit, which requires four-poly-Si TFTs and one-capacitor and no additional signal lines, has been proposed and sucessfully fabricated. The experimental results show that a new current mirror can considerably compensate luminance non-uniformity and scale down a data current more than a conventional current-mirror circuit in order to reduce the pixel charging time and increase the minimum data current. Compared with a conventional two-TFT pixel, the luminance non-uniformity induced by the grain boundaries of poly-Si TFTs can be decreased considerably from 41% to 9.1%.
- Published
- 2006
49. 28.1: AMOLED using CW laser Crystallized Polycrystalline Silicon Thin-Film Transistor
- Author
-
Jae-Hoon Lee, Nam-Kil Son, Woo-Jin Nam, Myung-Hwan Oh, Kyung-Dong Yang, Yong-Duck Son, Seong-Man Hong, Kyu Chang Park, Min-Koo Han, Dong-Joon Choo, and Jin Jang
- Subjects
Materials science ,business.industry ,Electrical engineering ,engineering.material ,Active layer ,law.invention ,Threshold voltage ,Polycrystalline silicon ,AMOLED ,Thin-film transistor ,law ,engineering ,Optoelectronics ,Crystalline silicon ,Crystallization ,business ,Electronic circuit - Abstract
We have developed a 2.2-inch QQVGA AMOLED display using CW laser crystallized (CLC) poly-Si backplane. By using CW laser, the a-Si on glass could be crystallized into one dimensional single crystalline silicon as a result of sequential lateral crystallization (SLC) region. The SLC region was used as an active layer of AMOLED backplane. The p-channel poly-Si TFT on SLC region exhibited the field-effect mobility of 173 cm2 /Vs, gate voltage swing of 0.5 V/dec. and threshold voltage of − 4.1 V. The brightness uniformity of AMOLEDs with and without compensation circuits have been compared.
- Published
- 2006
50. 44.3: High-Aperture Ratio AMOLED Pixel Design Employing VDD Line Elimination for Reducing OLED Current Density
- Author
-
Jae-Hoon Lee, Sang-Geun Park, Min-Koo Han, Woo-Jin Nam, and Changyeon Kim
- Subjects
Materials science ,Pixel ,business.industry ,Scan line ,Line (electrical engineering) ,Cathode ,law.invention ,Capacitor ,AMOLED ,law ,Electronic engineering ,OLED ,Optoelectronics ,business ,Current density - Abstract
A new high-aperture ratio AMOLED pixel design scheme improving OLED life-time is proposed. The VDD supply line in each pixel is eliminated and the scan line supplies VDD to a pixel, thus a high-aperture ratio of emission area is considerably increased. The increased emission area achieves a lower current density through OLED, so that the OLED degradation would be suppressed and the life-time of OLED may be improved without varying the OLED materials. We also designed a storage capacitor employing the bank layer dielectric between ITO and cathode rather than typically used VDD line.
- Published
- 2005
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