• 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.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2005년도 International Meeting on Information Displayvol.I
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• pp.251-254
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• 2005

A new driving waveform was proposed to reduce the cost in PDP-TV based on Vt close curve by eliminating the common (X) board under the conventional 42-inch panel structure. Due to the serious misfiring problem during a sustain-period when applying the new driving waveform, the wall voltage was measured and analyzed after the reset-period using Vt close curve. As a result of adopting the proposed driving waveform designed using Vt close curve analysis, the cost of PDP module could reduce compared with the conventional PDP module without any misfiring discharge.

• 한국정보처리학회논문지
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• 제6권5호
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• pp.1351-1361
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• 1999

The wide spread of multimedia system demands a large area viewing display device which can inform a message to many people in open area. This paper is about the design of a large area viewing LED panel control system. The control system runs on 16 bit microprocessor MC68EC000 and has following functions: 16 line clock and time, 2 channel priority interrupt, 2 channel direct memory access, 2 channel 12 bit clock and timer, 2 channel infrared remocon receiver, 2 channel RS-232C with 16 byte FIFO, IBM PC/AT compatible keyboard interface, ISA bus, battery backuped real time clock, battery backuped 256 byte SRAM and watch dog timer. The core circuits are implemented to ASIC, considering lower cost, higher reliability, higher performance, smaller dimension, and lower power consumption. This is verified by simulation and fabricated in 0.6 um CMOS SOG processes. The total gate count is 39,083 and the clock frequency is 48 MGz. The fabricated ASIC is mounted on test board.

• Journal of Power Electronics
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• 제8권2호
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• pp.148-155
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• 2008

In this paper, a cost-effective PDP driving circuit using the transformer network is proposed. Compared with the previous works, the half-bridge type energy recovery circuit recovers the reactive energy not to the capacitor but to the source. A single sustain board architecture removes the blocking switches which are placed on the discharge path in parallel, thus reducing the number of devices. A simple reset circuit generates the same waveforms as the previous approaches. The circuit configuration and modified driving waveforms are compared with the previous works. The validity of the proposed simplified driver is verified through tests using a 6-inch panel.

• 대한전기학회논문지:시스템및제어부문D
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• 제55권4호
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• pp.161-164
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• 2006

In this thesis we designed the vision system to inspect the defect of a back light unit of plat panel display device. The vision system is divided into hardware and inspection algorithm of defect. Hardware components consist of illumination part, robot-arm controller part and image-acquisition part. Illumination part is made of acrylic panel for light diffusion and five 36W FPL's(Fluorescent Parallel Lamp) and electronic ballast with low frequency harmonics. The CCD(Charge-Coupled Device) camera of image-acquisition part is able to acquire the bright image by the light coming from lamp. The image-acquisition part is composed of CCD camera and frame grabber. The robot-arm controller part has a role to let the CCD camera move to the desired position. To take inspections of surface images of a flat panel display it can be controlled and located every nook and comer. Images obtained by robot-arm and image-acquisition board are saved on the hard-disk through windows programming and are tested whether there are defects by using the image processing algorithms.

• 한국지능시스템학회논문지
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• 제25권3호
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• pp.260-265
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• 2015

본 논문은 에지 특징을 이용한 얼라인 시스템을 제안한다. 얼라인 시스템은 PCB나 LCD 패널 등에 새겨진 기준 마크(fiducial mark)를 통하여 위치 정보를 획득한다. 그러므로 획득한 영상에서 정확하게 기준 마크를 찾는 것이 얼라인 시스템 성능의 지표가 된다. 에지 특성은 위치, 길이, 형태 등의 기하학적 특징을 지니며 이런 특징은 기준 마크를 찾기 위해 적절하고, 밝기의 변화, 크기 및 각도의 변화에 강한 특성을 지닌다. X, Y 축 이동 및 회전 할 수 있는 장비와 소프트웨어을 이용한 얼라인먼트 실험을 통하여 제안한 시스템의 성능을 검증하였다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 1998년도 추계종합학술대회 논문집
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• pp.457-460
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• 1998

Recently, the research of the FPD(Flat Panel Display)which is substituted for CRT(Cathode Ray Tube) has been widely progressed. But most equipment that are used for production of FPD are expensive and we must import these equipment. Among these equipment, most important one is a auto-alignment system. In this paper, we present a high speed, high precision auto-alignment system, in which a PLD auto tuning algorithm, 1-dimensional CCD(Dcharge Coupled Device) camera, vision board, and vision data processing algorithm are included.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2004년도 추계학술대회 논문집
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• pp.1290-1294
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• 2004

Exposure System is used for printing a prescribed pattern on a printed board, a liquid crystal substrate or the like. In this paper we are trying to develop projection Optics Exposure System for manufacturing Color Filter of LCD Display. This paper explain the Projection Optics Design and Illumination Optics Design of Color Filter Exposure system.

• 한국산학기술학회:학술대회논문집
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• 한국산학기술학회 2007년도 춘계학술발표논문집
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• pp.62-65
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• 2007

본 연구에서는 LCD Panel 의 생산 후공정에서 사용되는 Ti-Con 보드의 동작 상태를 실시간으로 모니터링하고 원격지에 있는 엔지니어에게 TCP/P를 이용하여 고장 유무를 판별할 수 있는 데이터를 전송함으로써 신속한 대처가 가능할 뿐만 아니라 다중 프로세스가 가능하도록 제어할 수 있는 시스템을 개발하였다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2008년도 하계학술대회 논문집
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• pp.446-448
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• 2008

A new plasma display panel sustaining driver using single side sustaining technique with the dual resonant method is proposed. Since this circuit enables to reduce switches in energy recovery circuit with keeping voltage stress like that of prior circuit, it can be low cost circuit comparing with a conventional driver. To integrate sustain function into one side with single power source in the driver, a charge pump method is adopted to make negative sustaining voltage and achieve dual resonant energy recovery on sustaining modes.