• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.187-190
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• 2002

Plasma Display Panel(PDP) has been recognized as one of the most competitive display panel. Hence, the importance of PDP driving circuit is getting higher and higher. At the same time, it is strongly required for the driving circuit to be high efficiency, high stability, and cost effective one. In this work, a stable PDP driving circuit is developed by improving the circuit configuration. And the reliability and the productivity of the driving circuit are improved by using the Intelligent Power Module(IPM) technology. Finally operating characteristics of the developed IPM driving circuit are verified by using signal source board developed.

• ETRI Journal
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• 제26권5호
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• pp.509-511
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• 2004

This paper describes a novel current driving circuit for an active matrix organic light emitting diode (AMOLED). The proposed current driving circuit has a lower power consumption and higher chip density for the AMOLED display compared with the conventional one because all elements operate at a normal voltage and are shielded from the high voltage of the panel. The chip size and power consumption of the current driving circuit for an AMOLED can be improved by about 30 to 40% and 10 to 20%, respectively, compared with the conventional one.

• 한국군사과학기술학회지
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• 제5권1호
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• pp.45-58
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• 2002

In this paper, we designed the circuit of drive control for towing winch. It is composed of reference voltage circuit for driving voltage reference, low pass filter circuit for noise reduction, dead zone circuit for initial transient input, and driving circuit for drum direction/velocity control. Also it is realized a drive control circuit for towing winch drum in accordance with PWM(pulse width modulation) method to suit it's purpose of a large capacity driving system. The performance of the designed circuit is analyzed by experiments and the appliablity for driving the towing winch drum satisfactorily is evaluated through a various testing.

• 반도체디스플레이기술학회지
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• 제22권4호
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• pp.161-165
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• 2023

This paper designed a voltage feedback driving circuit to compensate for the characteristic deviation of the Active Matrix Organic Light Emitting Diode driving Thin Film Transistor. This paper describes a stable and fast circuit by applying charge sharing and polar stabilization methods. A 12-inch Organic Light Emitting Diode with a Double Wide Ultra eXtended Graphics Array resolution creates a screen distortion problem for line parasitism, and charge sharing and polar stabilization structures were applied to solve the problem. By applying Charge Sharing, all data lines are shorted at the same time and quickly positioned as the average voltage to advance the compensated change time of the gate voltage in the next operation period. A buffer circuit and a current pass circuit were added to lower the Amplifier resistance connected to the line as a polar stabilization method. The advantage of suppressing the Ringing of the driving Thin Film Transistor can be obtained by increasing the stability. As a result, a circuit was designed to supply a stable current to the Organic Light Emitting Diode even if the characteristic deviation of the driving Thin Film Transistor occurs.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2007년도 7th International Meeting on Information Display 제7권1호
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• pp.1001-1004
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• 2007

This paper proposes a novel RGB-LED (light emitting diode) backlight system, for 32" LCD TVs, accompanied by a new X-Y Channel driving method in which its row and column switches control the individual division screen. This proposed driving method is able to produce division driving effects such as image improvement and reduced power consumption. Not only that, the number of driver needed in this method, that is 3 power supplies with 3*(m+n) switches, is much fewer than that of cluster driving method, that is 3*(m*n) driver.

• 한국초전도ㆍ저온공학회논문지
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• 제14권3호
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• pp.43-47
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• 2012

A linear compressor generates pulsating pressure and oscillating flow in a cryocooler such as Stirling cryocooler and pulse tube refrigerator. It is driven by AC power source and designed to operate at resonance of piston motion. The driving voltage level is determined by electric parameters of resistance, inductance and thrust constant of linear motor. From voltage equation on linear motor, the power factor of driving power is inherently less than 1. The phase difference between voltage and current of supplied power can be zero using capacitor and this can minimize a supply voltage level. Especially, the linear compressor of kW class requires high voltage and thus can cause a difficulty in selecting power supply unit due to limitation of voltage level. The capacitor in driving electric circuit is useful to settle this problem. In this study, the electric circuit of linear compressor is analytically investigated with assumption of mechanical resonance. The electric parameters of commercial linear motor are used in the analysis. The effects of capacitor on driving voltage level and power factor are investigated. From analytic results, it is shown that the voltage level can be mimized with using capacitor in driving electric circuit.

• 한국정보전자통신기술학회논문지
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• 제15권3호
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• pp.205-210
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• 2022

본 논문은 OLED 구동 박막 트랜지스터의 문턱전압 변동에 의한 AMOLED 디스플레이의 휘도 불균일도를 개선하기 위해 n-채널 박막 트랜지스터만을 사용한 새로운 OLED 화소회로를 제안하였다. 제안한 OLED 화소회로는 6개의 n-채널 박막 트랜지스터와 2개의 커패시터로 구성하였다. 제안한 OLED 화소회로의 동작은 커패시터 초기화 구간, OLED 구동 박막 트랜지스터의 문턱전압을 감지하는 구간, 영상 데이터 전압 기입 구간 및 OLED 발광 구간으로 구성되어 있다. SmartSpice 시뮬레이션 결과, OLED·구동 박막 트랜지스터의 문턱전압이 1.5±0.3 V 변동 시 제안한 OLED 화소회로는 OLED 전류 1 nA에서 최대 전류 오차가 5.18 %이고 OLED 음극 전압이 0.1 V 상승 시 제안한 OLED 화소회로가 기존 OLED 화소회로보다 OLED·전류 변화가 매우 적었다. 그러므로, 기존 OLED 화소회로보다 제안한 화소회로가 문턱전압 변동 및 OLED 음극 전압 상승에 뛰어난 보상 특성을 가진다는 것을 확인하였다.

• 한국산학기술학회논문지
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• 제13권4호
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• pp.1777-1783
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• 2012

본 논문에서는 DC모터의 출력특성을 개선할 수 있는 새로운 구조의 DC모터 구동회로를 설계하였고 이 회로를 이용한 콘트롤러를 개발하였다. 설계된 구동 회로에 의하여 콘트롤러는 자체발진회로의 스위칭 신호를 갖는 트랜스포머를 이용하여 연속적으로 DC모터를 구동할 수 있다. 또한 최대속도시, 제어회로의 기준전압 값을 삼각파보다 높게 유지할 수 있고 모터 구동 FET를 항상 온 값을 가지도록 하여 최대출력을 얻을 수 있도록 한다. 제안된 구동회로를 활용하여 24V-500W급 DC모터속도 컨트롤러를 개발하였고 소형전동차를 제작하고 구동시험을 실시하였다. 구동테스트 및 특성 측정결과, 구동전류 12A로써 DC모터의 전진 및 후진 속도를 연속 가변 할 수 있음을 보였다. 그 밖에 과전류 감시기능, 모터과열 감시기능의 정상동작을 확인하였으며, 배터리 잔량이 20~100%까지 6단계로 표시할 수 있음을 확인하였다.

• 조명전기설비학회논문지
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• 제27권9호
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• pp.15-22
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• 2013

A new LED lamp driving technology with a charge pump instead of a conventional DC-DC converter is proposed. The proposed driving technology is used to control the LED lamp with digital dimming. The power loss in the zener diodes is reduced because the charging process of the capacitors is selectively controlled according to the digital control signal. From the experimental results, when dimming four LED lamps simultaneously, the average driving circuit efficiency of 89% is obtained, regardless of the dimming level. White light with color temperature over a range of 2800~7200K was produced by dimming control of red, green, blue and amber LED lamps with the proposed driving circuit. The characteristics of the driving circuits can be changed depending on the characteristics of the R, G, B, and A LED lamps. The efficiency of the driving circuits up to a maximum 89% can also be obtained depending on the combination of LED lamps. The driving technology with digital dimming control for LED lamps proposed in this paper would be effective for obtaining high efficiency in LED driving circuits and remote control of LED lamps using digital communications.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2006년도 6th International Meeting on Information Display
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• pp.393-398
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• 2006

This paper classifies driving technologies for AMOLEDs by the driving TFT conditions in pixels. A saturation region operation type driving TFT circuit provides good stability of OLED because of constant current drive. However, complicated compensation circuits are necessary to avoid effect of the TFT characteristics deviation. On the other hand, a linear region operation type driving TFT circuit provides better uniformity of the display image and lower power consumption. However, the stability of OLED is critical because of constant voltage drive.