• 제목/요약/키워드: Light-guide plate

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50μm급 마이크로렌즈 적용 2인치 휴대폰 LCD-BLU 금형 개발 : 광학패턴의 세장비 영향 (A Study on the Fabrication Method of Mold for 2 inch LCD-BLU by 50μm Microlens : Effect of Different Aspect Ratio)

  • 김종선;고영배;민인기;유재원;허영무;윤경환;황철진
    • 소성∙가공
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    • 제16권1호
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    • pp.48-53
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    • 2007
  • LCD-BLU(Liquid Crystal Display - Back Light Unit) consists of several optical sheets: LGP(Light Guiding Plate), light source and mold frame. The LGP of LCD-BLU is usually manufactured by etching process and forming numerous dots with $50{\mu}m$ in diameter on the surface. But the surface roughness of LGP with etched dots is very high, so there is much loss of light. In order to overcome the limit of current etched dot patterned LGP, optical pattern design with microlens of $50{\mu}m$ diameter was applied in the present study. The microlens pattern fabricated by modified LiGA with thermal reflow process was applied to the optical design of LGP and optical simulation was carried out to know tendency of microlens patterned LGP simultaneously. The attention was paid to the effects of different aspect ratio(i.e. $0.2\sim0.5$) of optical pattern conditions to the brightness distribution of BLU with microlens patterned LGP. Finally, high aspect ratio microlens patterned LGP showed superior results to the one made by low aspect ratio in average luminance.

LCD backlight용 산란형 도광판의 전산모사 (Computer simulation of scattering light guide plate for LCD blacklight unit)

  • 김경찬;오영식;정주영;하기룡;강신원
    • 한국광학회:학술대회논문집
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    • 한국광학회 2001년도 제12회 정기총회 및 01년도 동계학술발표회
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    • pp.136-137
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    • 2001
  • LCD(Liquid Crystal Display)는 크게 투과형과 반사형으로 나눌 수 있으며 투과형 LCD의 전력소모중 약 70%를 차지하는 부분이 백라이트 유닛이다. 다른 차세대 도광판 연구와는 달리 경사면을 이용한 방법이 아니라 도광판 속에서의 산란을 조절하는 방식이다. 기존 도광판은 그림 1-(b)처럼 밑면에 dot pattern을 인쇄하여 dot의 크기, 001의 간격을 이용한 것이다. (중략)

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LCD 백라이트용 렌티큘라 렌즈필름의 광구조 최적화에 관한 연구 (Study on the Optimization of the Optical Structure of Lenticular-Lens Films for LCD Backlight Applications)

  • 서재석;고재현
    • 한국광학회지
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    • 제22권6호
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    • pp.247-255
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    • 2011
  • 최근 확산기능과 집광기능을 동시에 가지는 복합필름에 대한 관심이 커지고 있다. 본 시뮬레이션연구에서는 복합필름으로 주목 받고 있는 렌티큘라 렌즈필름의 광학구조를 최적화하고 이를 기존의 백라이트가 보이는 광학 성능과 비교하였다. 보다 정확한 시뮬레이션의 수행을 위해 시험적으로 제작된 렌티큘라 렌즈필름이 보이는 휘도의 시야각 분포를 측정하였고 이 실험 결과를 재현할 수 있는 시뮬레이션 조건, 특히 도광판의 산란 패턴이 가지는 쌍방향 산란분포함수의 수학적 모델을 확보하였다. 이에 근거해서 시뮬레이션을 수행한 결과 렌티큘라 렌즈의 종횡비가 1.25, 굴절률이 1.65인 조건에서 이 필름의 집광성능이 최대가 됨을 확인하였다. 최적화된 렌티큘라 렌즈필름이 1매 포함된 백라이트 모델은 프리즘필름이 1매 포함된 기존의 백라이트에 비해 집광성능이 현저히 떨어졌지만 렌티큘라 렌즈필름 2매를 직교해서 적용하게 되면 프리즘필름 1매가 가지는 집광 성능과 비슷한 성능을 달성함과 동시에 부드러운 시야각 특성의 구현에 기여할 수 있다는 점을 확인하였다.

도로구조물 경량화를 위한 복합재료 샌드위치 패널에 관한 연구 (The Advanced Composite Sandwich Panels for Light Weight of Road Structures)

  • 한봉구
    • 한국도로학회논문집
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    • 제16권3호
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    • pp.1-8
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    • 2014
  • PURPOSES : The purpose of this paper is to demonstrate to the practicing engineers, how to apply the advanced composite materials theory to the road structures. For general construction material used, there is certain theoretical limit in sizes. For super road structure construction, the reduction in panel weight is the first step to take in order to break such size limits. METHODS : For a typical road structures panel, both concrete and advanced composite sandwich panels are considered. The concrete panel is treated as a special orthotropic plate. RESULTS : All types of advanced composite sandwich panels are considered as a self-weights less than one tenth of that of concrete panel. The concrete panel is treated as a special orthotropic plate to obtain more accurate result. CONCLUSIONS : Advanced composite sandwich panels are considered as a self-weights less than one tenth (10%) of that of concrete panel, with deflections less than that of the concrete panel. This conclusion gives good guide line for design of the light weight of road structures.

연속마이크로렌즈 200μm 적용 7인치 LCD-BLU 금형개발 (A Study on the Fabrication Method of Mold for 7 inch LCD-BLU by continuous microlens 200μm)

  • 김종선;고영배;민인기;유재원;허영무;윤경환;황철진
    • 소성∙가공
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    • 제16권1호
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    • pp.42-47
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    • 2007
  • LCD-BLU is one of kernel parts of LCD and it consists of several optical sheets: LGP, light source and mold frame. The LGP of LCD-BLU is usually manufactured by etching process and forming numerous dots with $50\sim300{\mu}m$ diameter on the surface. But the surface of the etched dots of LGP is very rough due to the characteristics of the etching process during the mold fabrication, so that its light loss is high along with the dispersion of light into the surface. Accordingly, there is a limit in raising the luminance of LCD-BLU. In order to overcome the limit of current etched dot patterned LGP, optical pattern with continuous microlens was designed using optical simulation CAE. Also, a mold with continuous micro-lens was fabricated by UV-LiGA reflow process and applied to 7 inch size of navigator LCD-BLU in the present study.

슬롯 다이 코팅과 Thermal Reflow방법을 이용한 Cylindrical 마이크로렌즈 제조 (Fabrication of Cylindrical Microlens Using Slot-die Coating and Thermal Reflow Method)

  • 이진영;박종운
    • 반도체디스플레이기술학회지
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    • 제19권3호
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    • pp.30-35
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    • 2020
  • A microlens has been fabricated by various methods such as a thermal reflow, hot embossing, diamond milling, etc. However, these methods require a relatively complex process to control the microlens shape. In this work, we report on a simple and cost-effective method to fabricate a cylindrical microlens (CML), which can diffuse light widely. We have employed a slot-die head with the dual plate (a meniscus guide with a protruded μ-tip and a shim with a slit channel) for coating of a narrow stripe using poly(methyl methacrylate) (PMMA). We have shown that the higher the coating gap, the lower the maximum coating speed, which causes an increase in the stripe width and thickness. The coated PMMA stripe has the concave shape. To make it in the shape of a convex microlens, we have applied the thermal reflow method. When the stripe thickness is small, however, its effect is negligible. To increase the stripe thickness, we have increased the number of repeated coating. With this scheme, we have fabricated the CML with the width of 223 ㎛ and the thickness of 7.3 ㎛. Finally, we have demonstrated experimentally that the CML can diffuse light widely, a feature demanded for light extraction efficiency of organic light-emitting diodes (OLEDs) and suppression of moiré patterns in displays.

SCS Micro-lens 패턴 적용 휴대폰 도광판 제작용 미세금형 제작에 대한 연구 (A Study on the Fabrication Method of Micro-Mold using 2.2inch LGP by the SCS Micro-Lens Pattern)

  • 오정길;김종선;윤경환;황철진
    • 소성∙가공
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    • 제20권1호
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    • pp.60-63
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    • 2011
  • BLU(back light unit) is one of kernel parts of LCD(liquid crystal display) unit. New 3-D micro-lens pattern for LGP(light guide plate), one of the most important parts of LCD-BLU, had been researched. Instead of dot pattern made by chemical etching or laser ablation, SCS(slanted curved surface) micro-lens pattern was designed with optical CAE simulation. This study introduce the method of design using optical CAE simulation for SCS micro-lens, the new fabrication method of micro-mold with SCS micro-lens pattern.

박막적층 비대칭 Extruded-closed-polygon 형 BLU 도광판의 제작 및 평가 (Fabrication and characterization of thin film asymmetric extrudedclosed-polygon type BLU light guide plate)

  • 김병권;구경완;한창석;오동철;이재각;배창환
    • 한국광학회:학술대회논문집
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    • 한국광학회 2009년도 창립 20주년기념 특별학술발표회
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    • pp.103-104
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    • 2009
  • We proposed the laminate thin film asymmetric Extruded-closed-polygon diffusion pattern that was able to improve the performance of back light unit. Developed a pattern of brightness and bright line, half-power angle attribute the improved performance in the uniform, and through the formation of a thin film stackable diffusion layer 970% improved perpendicularity brightness, and 580% improved horizontality brightness.

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Electric-optical Characteristics of Backlight Unit with LED Light Source in Low Temperature Condition

  • Han, Jeong-Min;Seo, Dae-Shik
    • Transactions on Electrical and Electronic Materials
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    • 제8권2호
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    • pp.93-96
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    • 2007
  • LCD (liquid crystal display) industry is needed to goods of high reliability and is interested in products without harmful material. In this experiment, we made the LED backlight unit for Automotive-navigation. And for making this backlight unit we used to eight side emitting type white LEDs with 1 W high power of the lumileds company. We could know that this backlight unit releases to 6500 nit in 14 W power consumption and start up voltage time is under the 15ms in the ambient temperature $-20\;^{\circ}C$.