• 한국정밀공학회지
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• 제23권4호
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• pp.91-98
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• 2006

A light guide panel (LGP) is an element of the LCD back light unit, which is used for display devices. In this study, the laser marking process is applied to the fabrication of light guide panels as the new fabrication process. In order to obtain a light guide panel which has high luminance and uniformity, four principal parameters such as power, scanning speed, ratio of line gap, and number of line were selected. A Web-based design tool was developed to generate patterns of light guide panel at any location, and the tool may assist the designer to develop optimized patterns. Topcon-BM7 was used for luminance measurement of each specimen with $100mm{\times}100mm$ area. By Taguchi method optimized levels of each parameters were found, and luminance of $3523cd/cm^2$ and uniformity of 92% were achieved using the laser machined BLU.

• 소성∙가공
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• 제17권5호
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• pp.322-327
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• 2008

LGP is a key component of LCD back light unit because it determines brightness and sharpness of the display image. Usually, it has optical patterns fabricated on the bottom surface. These optical patterns convert point or line sources placed in the side of LGP to plane source at the top surface by changing the propagating direction of the incident light. In the present paper the LiGA-reflow method was applied to fabricate the LGP mold. Furthermore, the optical simulation considering the replication ratio of pattern height was applied to the pattern design. The optical simulation through systematic correction scheme was adopted to find the optimum distribution of pattern density. Finally, the stamper fabricated by this method was installed in the mold and LGP was produced by injection molding. As a result of luminance measurement for the final product, the average luminance and luminance uniformity was measured 3,180 nit and 84%, respectively. Consequently, the mold fabrication method using the LiGA-reflow and optical simulation(CAE) can save the expense and time compared with the existing fabrication methods(laser ablation and chemical etching).

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2008년도 춘계학술대회 논문집
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• pp.269-272
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• 2008

LGP is a key component of LCD back light unit because it determines the brightness and sharpness of display image. Usually, it has optical patterns fabricated on the bottom surface. In the present paper the LiGA-reflow method was applied to fabricate the LGP mold. Furthermore, the optical simulation considering the replication ratio of pattern height was applied to the pattern design. The optical simulation through systematic correction scheme helped find the optimum distribution of pattern density. Finally, the stamper fabricated by this method was installed in the mold and LGP was produced by injection molding. As a result of luminance measurement for the final product, the average luminance and luminance uniformity was measured 3,180 nit and 84%, respectively. Consequently, the mold fabrication method using the LiGA-reflow and optical simulation(CAE) can save the expense and time compared with the existing fabrication methods(laser ablation and chemical etching).

• 한국광학회지
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• 제18권1호
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• pp.1-7
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• 2007

필터와 검출기로 구성된 필터식 색채계의 분광감응도는 국제조명위원회(Commission Internationale de I'Eclairage, CIE)에서 정의한 등색함수와 일치해야 한다. 본 연구에서는 정확도가 높은 색채계에 적용할 수 있는 등색함수 $\bar{x},\;\bar{y}\;\bar{z}$에 대한 필터를 상용화된 색필터를 조합하여 제작할 수 있도록 설계하였다. 특히 등색함수 $\bar{x}$는 두 개의 투과대역을 가지고 있기 때문에 파장 영역이 다른 2 개의 필터로 분리하여 실현하였다. 설계에는 색필터의 두께를 곡선 맞춤변수로 두고 비선형 최소제곱법으로 필터의 품질지수 $f{_1}'$ 값을 최적화하는 프로그램을 개발하여 사용하였다. 그 결과 모든 필터의 $f{_1}'$ 값이 3 % 이하가 되도록 설계할 수 있었으며, $\bar{y}$ 등색함수 필터를 실제로 제작하여 $f{_1}'$ 측정값이 2.8 %임을 검증하였다. 또한 설계한 등색함수 필터로 색채계를 제작하여 LCD 평판 디스플레이의 색채 측정에 사용할 경우 발생하는 계통오차도 산출하였다.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2009년도 추계학술대회 논문집
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• pp.203-203
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• 2009

Low temperature annealing for oxide TFTs including IGZO on PI substrate is the essential process to fabricate flexible display devices, since low heat-resistance on PI and PEN substrates limits the temperature range. Laser annealing is one of the promising candidates for low temperature process, and it has been used for various application in semiconductor and LCD fabrication. We irradiated laser to solution-based IGZO thin films on PI substrate were irradiated to laser beam, and investigated laser damage of PI layer. Based on transmittance analysis, wavelength(532nm) and scan speed(1000mm/s) is the optimized condition for laser irradiation about ink-Jet printed oxide TFTs on PI substrates.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2005년도 추계종합학술대회
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• pp.759-762
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• 2005

The LGP(Light Guide Panel) for the back light unit that is used to the 2.2" TFT LCD was designed and fabricated. The method of the pattern design which is the most important in the design of the LGP was converted the V-cutting method into the Dot method. This newly developed Dot method provided a good uniformity in the brightness at the LGP, which was a very difficult problem to solove in the V-cutting method. The experiment result of the newly designed LGP shows the brightness uniformity 90% and the brightness 3656 $cd/\;m^2$ which is 20% higher than the commercial products.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2007년도 춘계학술대회A
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• pp.608-613
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• 2007

Fine pitch microprobe arrays are microneedle-like probes for inspecting the pixel of LCD panel. They are usually made of multilayers of metallic, nonmetallic, or combination of the two. In this study, the microprobe arrays were fabricated using the process applied for MEMS fabrication technology and they consist of BeCu, BeNi, or Si. Their contacting probing force and deflection were measured using the laser equipment. The design requirement are 5gf of a minimum contact force and $150{\mu}m$ of a maximum deflection. A lot of microprobe shape are possible satisfying the requirement. A double cantilever-type microprobe having needles on both ends were applied for this study. Several candidate were chosen using the topology and shape optimization technique subjected to the design requirements. Finite element results and experimental results were compared and both gave good correlation.

• Journal of the Optical Society of Korea
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• 제19권1호
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• pp.80-83
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• 2015

White reflective patterns are very difficult to fabricate, due to the scattering and reflection of light, especially when the pattern size goes down to micron size. A reflective white barrier structure of height $50{\mu}m$ and width $80{\mu}m$ was fabricated using dry-film resist as an intermediate reverse pattern. The reverse dry-film resist pattern was coated with an $SiO_2$ layer by sputtering, to protect the resist from chemical attack by the radical molecules in UV white resin. The UV white resin was applied on the dry-film resist pattern and then cured with ultraviolet light. The fine three-dimensional reflective patterns were finished by removing the dry-film resist.

• 한국컴퓨터정보학회:학술대회논문집
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• 한국컴퓨터정보학회 2015년도 제51차 동계학술대회논문집 23권1호
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• pp.95-98
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• 2015

요즘 현대사회는 주거생활을 윤택하게 하기 위해 많은 노력을 기울이고 있다. 특히, 런던협약에 의해 음식물 쓰레기에 대한 대안은 분명히 필요한 부분이다. 런던 협약은 세계 각국의 폐기물 투기로 오염이 심각해짐에 따라 1972년 2월 유럽국가들이 모여 체결한 협약으로, 런던 협약에 가입한 국가는 매년 자국이 해양에 버리고 있는 폐기물 현황을 협약사무국에 보고할 의무가 있고 해양투기 금지를 저준위 방사성 물질을 포함한 모든 방사성 폐기물과 산업폐기물의 해양투기를 금지하기로 결의한 협약이다. 본 논문에서는 태양열 집열판을 이용해 자체적인 전원사용이 가능하도록 하여 음식물처리기 제어를 :LCD를 통한 GUI(Graphic User Interface)시스템으로 접근성이 쉽게 조작하도록 하여 사용자 편의에 중점을 두어 설계하였다.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2006년도 6th International Meeting on Information Display
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• pp.695-698
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• 2006

The photosensitive poly-siloxane material used as the passivation layers for the conventional back channel etched (BCE) thin film transistors (TFTs) has been investigated. Through the organic material, the TFT array fabrication process can be reduced and higher aperture ratio can be achieved for higher LCD panel performance. The interface between the organic passivation layer and the back channel of the amorphous active region has been improved by the back channel oxygen treatment and the devices exhibits lower leakage current than the conventional silicon nitride passivation layer of BCE TFTs. The leakage currents between Indium-tin-oxide (ITO) pixels and the TFT devices and its mechanism have also been investigated in this paper.