온도 적응형 PDP RESET 파형 발생회로의 개발

신민호,김철우 전력전자학회 2005 전력전자학회 논문지 Vol.10 No.6

Driving Waveform of AC PDP in reset periode is increased and decreased with constant slope to improve dark room contrast ratio and image quality. But the slope and magnitude of ramp waveform are related to strong and weak discharge with temperature change in AC PDP. So this paper proposes a methods of changing the slope and magnitude of ramp waveform during reset periode according to temperature change in AC PDP. Experimental variable factors are chosen to setup slope, setdown slope, and -Vy voltage magnitude in Y sustain electrode. The proposed methods are expected to compensate for effect of the temperature change, causing misfiring in high and low temprature, with varing the slope and magnitude of ramp voltage during reset period and improve image quality. AC PDP의 구동파형은 Reset 구간에서 명암비를 높이고 화질향상을 위해서 전압파형을 서서히 증가시키고 또 감소시키는데, 이 전압파형의 기울기와 크기가 온도와 더불어서 PDP의 화질과 관련이 있다. 그래서 본 논문에서는 Reset 구간에서 Y 전극에 인가하는 램프파형의 setup 및 setdown 구간에서의 기울기와 -Vy전압을 온도에 따라서 가변함으로써, 주위의 온도가 상온에서 저온이나 고온으로 변화하여도 PDP의 화질이 영향을 받지 않고 최상으로 유지하게 하는 온도 적응형 RESET 파형 발생회로를 제안하였다.

A New Structure and Driving Scheme of PDP for High Luminous Efficacy

Yi, Jeong-Doo,Kim, Joon-Yeon,Chae, Su-Yong,Kim, Tae-Woo,Cho, Sung-Chun,Chun, Byoung-Min,Kim, Jeong-Nam,Cho, Yoon-Hyoung The Korean Infomation Display Society 2004 Journal of information display Vol.5 No.2

We have developed a new PDP cell structure called MARI(Multi Anode for Reduction of Ionic effect) and new driving scheme achieving a high luminous efficacy. The MARI PDP has middle electrode inserted between X and Y main electrodes. In the MARI PDP, reset and scan voltage is applied to middle electrode and sustain voltage is applied to X and Y electrode. Using a long gap sustain discharge we accomplished a high luminous efficacy. And we developed 42"full panel adopting MARI structure and new driving scheme and attained luminous efficacy of 2.35 lm/W.

High-capacitance activated bio-carbons with controlled pore size distribution for sustainable energy storage

Kim, Yong Il,Lee, Yun Jung,Yoo, Jungjoon,Kim, Jong-Huy Elsevier 2019 Journal of Power Sources Vol.438 No.-

<P><B>Abstract</B></P> <P>Depletion of fossil-fuel energy resources creates a demand for sustainable energy technologies and therefore necessitates the development of sustainable energy storage devices with sustainable materials, eco-efficient synthetic methods, and robust cycle life. Electric double layer capacitors are potential candidates for sustainable energy storage because they usually employ carbon-based electrode materials with semi-permanent lifetimes and high powers. Although various carbon materials are commercially available, new methods are needed to produce eco-efficient synthesized carbon materials with high performances. Herein, we introduce an effective strategy that uses biomaterials as carbon sources and adopts a reusable KOH solution soaking method for the activation process to reduce KOH consumption, which includes a pore-size control process to enhance electrochemical performances. The obtained bio-carbons exhibit specific capacitances (160.6 and 151.2 F g<SUP>−1</SUP> in aqueous and organic electrolytes, respectively) superior to that of commercially available activated carbon (~80 F g<SUP>−1</SUP>), which is attributed to the synergetic effect between the pore-size-controlled activated carbon for efficient ion transport and the well-matched electrolyte. Our strategy provides a versatile method for the scalable fabrication of sustainable energy storage materials and is promising for the development of high-performance supercapacitors.</P> <P><B>Highlights</B></P> <P> <UL> <LI> •Activated bio-carbons for sustainable energy storage were prepared </LI> <LI> •Physical properties of the pore-size controlled materials were evaluated </LI> <LI> •Activated carbon electrodes were applied in electric double-layer capacitors </LI> <LI> •The electrodes showed excellent capacitance in aqueous and organic electrolytes </LI> <LI> •The large specific surface area and ion-matched pore size were key to performance </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

New Electrode Shape for High Xe-content Gas in AC PDP

Park, Cha-Soo,Choi, Joon-Young,Kim, Goon-Ho,Kim, Joong-Kyun,Kim, Dong-Hyun,Lee, Ho-Jun,Park, Chung-Hoo The Korean Infomation Display Society 2003 Journal of information display Vol.4 No.4

One of the most important issues in AC PDP is the improvement of luminous efficiency. One possible method for achieving this aim is by increasing Xe partial pressure in discharge gas mixture. The increase of Xe ratio, however, causes the driving voltage to rise, even if brightness is increased. In this study, a new electrode shape is proposed. A test panel fabricated by using a new electrode shows that efficacy has improved by 25 % and sustain voltage has decreased by 20 % compared with the conventional structure.

Effect of Some Design Factors in the Front Panel on the Characteristics of a Plasma Display

김병규,문철희 한국정보디스플레이학회 2008 Journal of information display Vol.9 No.3

Low sustained voltage (Vs) and high luminous efficiency (lumen/Watts) are required for the enhanced performance of an AC PDP. Both are not realized in the same condition, however, because luminous efficiency decreases when the sustained voltage is lowered in most cases. In this study, the three design factors in the front panel of a PDP, i.e., the thickness and posi-tion of the bus electrode and the thickness of the dielectric layer, were chosen to investigate how they affect the sustained voltage and the luminous efficiency, and to find a way to optimize them. Two values were given to each of the three design factors, and experiments were done via full factorial design, i.e., with a total of eight conditions, using a 3-in.diagonal test panel. The changes in the sustained voltage and the luminous characteristics were explained in connection with the discharge characteristics of the PDP cells.

Effect of Some Design Factors in the Front Panel on the Characteristics of a Plasma Display

Kim, Beong-Ju,Moon, Chelo-Hee The Korean Infomation Display Society 2008 Journal of information display Vol.9 No.3

Low sustained voltage $(V_s)$ and high luminous efficiency (lumen/Watts) are required for the enhanced performance of an AC PDP. Both are not realized in the same condition, however, because luminous efficiency decreases when the sustained voltage is lowered in most cases. In this study, the three design factors in the front panel of a PDP, i.e., the thickness and position of the bus electrode and the thickness of the dielectric layer, were chosen to investigate how they affect the sustained voltage and the luminous efficiency, and to find a way to optimize them. Two values were given to each of the three design factors, and experiments were done via full factorial design, i.e., with a total of eight conditions, using a 3-in.diagonal test panel. The changes in the sustained voltage and the luminous characteristics were explained in connection with the discharge characteristics of the PDP cells.

AC Plasma Display Panel 구동 장치의 고효율 전력 회수 회로에 관한 연구

윤원식,강필순,김철우 전력전자학회 2001 전력전자학회 논문지 Vol.6 No.6

The sustaining driver for color AC Plasma Display Panel should provide alternating high voltage pulses and recover the energy discharged from the intrinsic capacitance between the scanning and sustaining electrodes inside the panel In this paper a novel efficient energy recovery circuit employing boost-up function is proposed to achieve a faster rise-time and in order to obtain a stable sustain voltage The principle of operation. features simulated results and experiment results are illustrated and verified on a 7.5-inch-panel with 200[kHz]switch frequency. 현재 AC-PDP(Plasma Disphay Panel) 의 기술은 급속히 발전하고 있는 추세이지만 아직도 몇가지 문제로 인해 이를 해결하기 위한 다각적인 접근이 이루어지고 있다. 동화상 윤곽의 제거 광(光) 대비 향상을 통한 화질의 개선 신뢰도 및 전력 효율을 개선하는 등의 문제가 여기에 해당되며 그 중에서도 특히 전력 효율의 관점에서 40 인치 이상의 대형화면을 지향한는 PDP 기술에서 가장 큰 약점으로 분류되고 있는 수백 와트(watt)에 이르는 전려 소모를 CRT 수준이 200[W] 미만으로 낮추어 것이 시급한 당면 과제이다. 전려 효율을 향상시키기 위해서 PDP의 발광효율을 높이는 것과 함께 기체 장번과는 직접적인 관련이 없이 구동과정시 발생하게 되는 불필요한 전력소모를 최소화 하여야 한다. 본 논문에서는 이러한 전력 소모를 최소화하기 위한 새로운 형태의 고효율 에너지 회수 회로를 제안하고 시뮬레이션을 통해 그 동작을 확인하였다. 또 이는 회로를 설제 7.5인치 패널에 인가하고, 200[kHz]에서 실험하여 제안한 고효율 에너지 회수회로의 타당성을 검증하였다.

AC 플라즈마 디스플레이패널의 방전개시전압에 모델과 실험의 비교에 관한 연구

박장식 한국전기전자재료학회 2000 전기전자재료학회논문지 Vol.13 No.12

Breakdown voltage model and expertiments are compared for discharge cells of AC plasma display panel. In the model, discharge paths are assumed to be initial electric field lines and the one-dimensional continuity equation is applied to the charged particle transport at each field line. The comparisons are performed in the wide range of gas pressure (50-600torr), Xe partial pressure over total pressure (1-6%), sustain electrode gap(100-1000$\mu\textrm{m}$), wall height(130, 300$\mu\textrm{m}$), and voltage pulse width(2-6${\mu}$s). The presented breakdown voltage model well agree with experiments in the above wide range. The increase of breakdown voltage with the decrease of the width(L) of protruding electrode is also described by the model.

Comparison of Temporal Dark Image Sticking Produced by Face-to-Face and Coplanar Sustain Electrode Structures

Kim, Jae-Hyun,Park, Choon-Sang,Kim, Bo-Sung,Park, Ki-Hyung,Tae, Heung-Sik The Korean Infomation Display Society 2007 Journal of information display Vol.8 No.3

The temporal dark image sticking phenomena are examined and compared for the two different electrode structures such as the face-to-face and coplanar sustain electrode structure. To compare the temporal dark image sticking phenomena for both structures, the differences in the infrared emission profile, luminance, and perceived luminance of the image sticking cells and the non image sticking cells were measured. It is observed that the temporal dark image sticking is mitigated for the face-to-face structure. The mitigation of the temporal dark image sticking for the face-to-face structure is due to the slight increase in the panel temperature induced by the ITO-less electrode structure.