• Proceedings of the KIEE Conference
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• 대한전기학회 2005년도 제36회 하계학술대회 논문집 C
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• pp.2052-2054
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• 2005

TFT-LCD requires to use poly silicon for High resolution and High integration. Thin film make of Poly silicon on the excimer laser-induced crystallization of PECVD(plasma-enhanced chemical vapor deposition)-grown amorphous silicon. In the thin film hydrogen affects to a device performance from bad elements like eruption, void and etc. So dehydrogenation prior to laser exposure was necessary. In this study, use RTP(Rapid Thermal Process) at various temperature from $670^{\circ}C$ to $750^{\circ}C$ and fabricate poly-silicon. it propose optimized RTP window to compare grain size to use poly silicon's SEM pictures and crystallization to analyze Raman curved lines.

• Proceedings of the Korea Information Processing Society Conference
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• 한국정보처리학회 2013년도 추계학술발표대회
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• pp.1525-1527
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• 2013

본 논문에서는 저시력자의 개선된 독서 환경을 제공하는 시각보조기기를 위한 실시간 영상처리 SoC(System on Chip) 하드웨어 구조 설계에 대해서 기술한다. 기존의 시각보조기기는 화면 영상이 실제 움직임보다 늦게 출력되는 잔상 현상이 발생하며, 색 변환 기능도 제한적이다. 따라서 본 논문에서 제안하는 실시간 영상처리 SoC 하드웨어 구조는 데이터 연산을 최소화함으로써 잔상 현상이 감소되며, 저시력자를 위한 다양한 색상 모드를 지원한다. 제안하는 영상처리 SoC 하드웨어 구조는 Core-A 모듈, Memory Controller 모듈, AMBA AHB bus 모듈, ISP(Image Signal Processing) 모듈, TFT-LCD Controller 모듈, VGA Controller 모듈, CIS Controller 모듈, UART 모듈, Block Memory 모듈로 구성된다. 시각보조기기를 위한 실시간 영상처리 SoC 하드웨어 구조는 Virtex4 XC4VLX80 FPGA 디바이스를 이용하여 검증하였으며, TSMC 180nm 셀 라이브러리로 합성한 결과 동작주파수는 54MHz, 게이트 수 197k이다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 한국해양정보통신학회 2008년도 춘계종합학술대회 A
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• pp.886-889
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• 2008

Today, digital technology can be possible U-city, U-healthcare because network and wireless communication have developed very rapidly and widely. In this paper we implemented embedded server and Zigbee sensor boards. For the development, Implemented home server platform has a Intel PXA255 processor, web server, USB camera and TFT LCD. The other hand, Zigbee sensor boards are attached the AVR microprocessor and the several sensors to get the environment variables.

• Proceedings of the KIEE Conference
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• 대한전기학회 2004년도 하계학술대회 논문집 C
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• pp.1945-1947
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• 2004

"CRT" which had dominated the market of display until 2000 is not appropriate for information indicating media due to several limitations. Thus, TFT-LCD, PDP, OLED, etc are growing in display industry instead of CRT because they meet demands of information indicating media. OLED display which responses within 1ms fits any picture manifestation medias because it uses self radiance OLED for picture clement that has no obstacles in showing the angle of vision. OLED's characteristic of action is very sensitive to thickness of electrode so that this has been an important issue. This study tried to find the most suitable thickness of electrode using ITO, Mo, and AL. Using the results of IVL measurements, analyzed equality of electrode board. As a result, found the thickness of electrode that has high electrical efficiency and optimized it.

• Journal of Sensor Science and Technology
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• 제16권2호
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• pp.142-149
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• 2007

Wireless sensor network technology is an emerging technology consisting of small, low power, and low cost devices that integrate limited computation, sensing, and radio communication capabilities. An ad-hoc home network system based embedded system for home environment monitoring was fabricated and tested. The wireless sensor node consists of a MCU, RF transceiver and sensors (temperature, humidity and light). Wireless sensor nodes run application software for data sampling and wireless communication, that was developed using 'nesC language' which runs on TinyOS. In our tests, acquired sensors data were monitored on 6.4" TFT-LCD of base-station through IEEE802.15.4 standard wireless communication. Also, the sensor data can be monitored by client user at the terminal PC to monitor environmental status of home in real time.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2006년도 6th International Meeting on Information Display
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• pp.1625-1628
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• 2006

Two different negative-type photosensitive polyimides were synthesized and characterized for an application as an interdielectric layer in TFTLCD array. In the case of photocurable polyimides, the photosensitive moiety, 2-HHSP, was synthesized through 3 step reaction, and then was incorporated into side chains of polyimide precursor by post reaction. Optimum compositions of negative-type photocurable polyimde were also formulated. For photopolymerizable polyimides, two novel UV monomers containing imide linkages were prepared. An aqueous alkaline developable polymer matrix was synthesized by free radical copolymerization. A negative photoresist formulation was developed utilizing synthesized UV monomers containing imide linkage, photoinitiator, UV oligomer, and alkali developable polymer matrix. It was found that viaholes with good resolution, high transmittance and thermal resistance could be obtained by photolithographic process utilizing the negative-type photoresist formulations.

• Proceedings of the Korean Vacuum Society Conference
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• 한국진공학회 1999년도 제17회 학술발표회 논문개요집
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• pp.246-246
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• 1999

TFT-LCD 제조공정의 발전에 따라, 박막층(a-Si, SiNx, gate 전극, ITO 등)에 대한 습식공정을 대치하는 건식식각이 선호되고 있다. scan signal의 전파지연시간을 단축시키는 장점을 갖는 Al gate 전극의 건식식각의 경우, 높은 식각속도와 slope angle의 조절, 그리고 식각균일도가 요구된다. 이러한 Al gate 전극물질로는 Al에 Ti이나 Nd와 같은 금속을 첨가하여 post annealing 동안에 발생하는 hillock을 방지하고 더불어 낮은 resistivity(<10$\mu$$\Omega$cm)와 열과 부식에 대한 높은 저항성을 얻을 수 있다. 그러나 Al-Nd alloy 박막은 식각속도와 photoresist에 대한 식각선택도가 낮아 문제로 지적되고 있다. 본 실험에서는 고밀도 플라즈마원의 일종인 자화된 고밀도 유도결합형 플라즈마를 이용하여 식각가스 조합, inductive power, bias voltage 그리고 공정압력 등의 다양한 공정변수에 따른 Al-Nd film의 기본적인 식각특성 변화를 관찰하였다. 식각시 chloring gas를 주요 식각가스로 사용하고 BCl, HBr 등을 10mTorr의 일정한 압력을 유지하는 조건하에서 첨가하였으며 inductive power는 5100W~800W, bias voltage는 -50V~-200V까지 변화를 주었다. 식각공정의 전후를 통하여 Al-Nd 박막표면의 조성변화를 관찰하기 위하여 X-ray photoelectron spectroscopy(XPS)를 이용하였으며 공정변수에 따른 식각후 profile 관찰은 scanning electron microscopy(SEM)을 통하여 관찰하였다. Al-Nd 식각속도는 100% Cl2 플라즈마에 비해 BCl3의 양이 증가할수록 증가하였으며 75%의 BCl3 gas를 첨가하였을 때 가장 높은 식각속도를 얻을 수 있었다. 또한 SEM을 이용한 표면분석으로 roughness가 감소된 공정조건을 찾을 수 있었다.

• Journal of the Semiconductor & Display Technology
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• 제10권4호
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• pp.53-59
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• 2011

Recently there have been considerable attentions on nanoimprint lithography (NIL) by the display device and semiconductor industry due to its potential abilities that enable cost-effective and high-throughput nanofabrication. Although one of the current major research trends of NIL is large-area patterning, the technical difficulties to keep the uniformity of the residual layer become severer as the imprinting area increases more and more. In this paper we focused on the deformation of the $2^{nd}$ generation TFT-LCD sized ($370{\times}470mm^2$) large-area soft mold in the UV imprinting process. A mold was fabricated with PDMS(Poly-dimethyl Siloxane) layered glass back plate(t0.5). Besides, the mold includes large surrounding wall type protrusions of 1.9 mm width and the via-hole(7 ${\mu}m$ diameter) patterend area. The large surrounding wall type protrusions cause the proximity effect which severely degrades the uniformity of residual layer in the via-hole patterend area. Therefore the deformation of the mold was calculated by finite element analysis to assess the effect of large surrounding wall type protrusions and the flexiblity of the mold. The deformation of soft mold was verified by the measurements qualitatively.

• Proceedings of the Safety Management and Science Conference
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• 대한안전경영과학회 2003년도 춘계학술대회
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• pp.135-141
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• 2003

An experiment was conducted to identify salient colours for information coding at electronic video displays. CRT and TFT-LCD were used to evaluate the effect of different types of electronic displays on the salience of colours. Total of 100 Subjects, 50 for each display were asked to select more salient 10 colours among 24 given colours. There was no statistically significant difference in the salience of colours between the two display types. The result showed that the tested colours could be clustered into 5 categories according to their brightness, saturation, and the number of R, G, B elements occupied to reproduce the colours. Three achromatic colours (black, white, grey) and eight chromatic colors (red, yellow, green, blue, cyan, orange, magenta, and indigo) were identified as the salient colours at the electronic video displays. The result also showed that the eight chromatic colours could be clustered into two distinct categories, landmark colours(red, yellow, green, and blue) and the other basic colours (cyan, magenta, orange, and indigo). It is noticeable that cyan, magenta, and indigo substituted for pink, purple, and brown that were recommended as the salient colours for the environment not using electronic video displays by the previous researches.

• Proceedings of the KAIS Fall Conference
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• 한국산학기술학회 2004년도 춘계학술대회
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• pp.176-178
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• 2004

디스플레이 매체의 발전에 따라 TV나 컴퓨터 모니터 또는 TFT-LCD, PDP, EL 등의 평판 디스플레이장치들의 대형화, 고화질, 고정밀도가 요구되어지고 있다. 이러한 디스플레이 장치들은 영상표시를 위해 유리를 사용하고 있는데, 사용되는 유리의 형상과 두께는 디스플레이 장치들의 성능에 영향을 준다. 특히 장치가 대형화되면서 대형 평판 유리의 변형된 형상과 균일하지 않은 두께는 디스플레이 장치들의 고화질, 고정밀도를 막는 주요한 요인이 되고 있다. 이러한 이유로 디스플레이 장치용 평판 유리의 형상 및 두께를 측정하는 센서의 요구가 많아지고 있다. 그러나 아직 유리의 형상과 두께를 측정하는 센서 및 시스템은 고가이고. 측정 방법 또한 많은 문제점을 가지고 있다. 본 논문에서는 이러한 문제점들을 해결하기 위하여 하나의 센서로 유리의 형상과 두께를 동시에 고속으로 측정이 가능한 저가의 비접촉식 광센서를 개발하기로 한다. 이 논문에서 개발된 광센서에는 CD-player에 사용되는 홀로그램 레이저를 사용함으로써 고정밀 형상측정, 저가의 광센서, 센서의 소형화를 이룰 수 있다.