Modeling for New Type Backlight Units

Lee, Kwang-Hoon; Jee, Seunghyun; Kim, Soohyun; Yoon, Young-Soo; Kim, Soo‐Ho

doi:10.3807/kjop.2010.21.2.041

Cited by 4 publications

(2 citation statements)

References 2 publications

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“…이 필름들은 PET기판 위에 형성된 반구형 마이크로 렌즈나 일차원 프리즘을 이용해 빛을 굴절시켜 적 절한 확산 및 집광 작용을 일으킨다. 최근 확산과정과 집광 과정을 동시에 담당하는 복합필름(hybrid film) [8] 혹은 복합 도광판 [9][10][11] 에 대한 연구가 활발히 이루어지고 있다. 복합기 능을 가진 광학부품을 사용하게 되면 백라이트에 포함되는 광학부품의 숫자가 줄어들고 조립시간도 줄어드는 등 다양 한 장점을 기대할 수 있다.…”

Section: 백라이트에서 빛의 유도(Guiding)를 담당하는 부품은 도광판unclassified

Study on the Optimization of the Optical Structure of Lenticular-Lens Films for LCD Backlight Applications

Seo¹,

2011

Korean Journal of Optics and Photonics

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The optical performance of LLF(Lenticular Lens Film)-based backlight was studied by using optical simulation as functions of the aspect ratio and the refractive index of lenticular lenses. In order to perform reliable simulation, the BSDF(bi-directional scattering distribution function) of the scattering dots on the bottom surface of the light guide plate was obtained as a superposition of the Lambertian and the elliptic Gaussian distribution components by comparing the experimental results and the simulation for the luminance distribution on the light guide. Based on this approach, an appropriate BSDF of the scattering dots of the light guide was constructed. The resultant values of the optimized aspect ratio and the refractive were found to be 1.25 and 1.65, respectively. In spite of the hybrid aspects of LLF incorporating both diffusing and collimating functions, the optical performance, in particular the on-axis luminance of LLF-based backlight was inferior by about 20% compared to that of conventional backlights adopting one prism film. However, the combination of two lenticular lens films resulted in comparable luminance gain as well as smooth decrease in the luminance with the viewing angle without exhibiting any side lobes.

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Section: 백라이트에서 빛의 유도(Guiding)를 담당하는 부품은 도광판unclassified

Study on the Optimization of the Optical Structure of Lenticular-Lens Films for LCD Backlight Applications

Seo¹,

2011

Korean Journal of Optics and Photonics

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“…그래서 광학시 트의 수를 최소화하려는 연구가 여러 곳에서 진행되고 있다. 프리즘 시트를 대체하기 위한 연구로 microlens array (MLA) sheet [2][3][4] 와 cone array sheet [5,6] 가 있으며, MLA sheet의 경우 미래나노텍의 UTE film [7] 으로 이미 상용화 되어 있다. 일체 형 BLU로는 micro reverse-cone array (MRCA) [8,9] 가 연구되 고 있는 등 광학시트의 수를 줄이기 위한 많은 연구가 진행 되고 있다.…”

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Optical Characteristics of Sheetless LCD Backlight Using Micro Reverse-pyramid Array

Jeon¹,

Lim²,

Gwag³

et al. 2012

Korean Journal of Optics and Photonics

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영남대학교 물리학과 우 712-749 경북 경산시 대동 214-1 (2012년 4월 25일 받음, 2012년 5월 31일 수정본 받음, 2012년 5월 31일 게재 확정) LCD backlight unit (BLU)에서 도광판 상부에 micro reverse-pyramid array (MRPA) 또는 micro reverse-cone array (MRCA)을 설치함으로써 기존의 확산 시트와 프리즘 시트를 없애고 구조를 단순화하였으며, 광학적 시뮬레이션을 통하여 새로운 도광판의 최적 조건을 얻었다. MRPA와 MRCA의 측면각과 높이, 윗변의 반지름이나 윗변의 길이에 따라 휘도와 시야각의 변화를 구하였 다. MRPA와 MRCA 구조물의 최적의 형상은 측면각이 각각 59도와 57도이었으며, 시야각은 68도와 64도이었다. 구조물의 높이 는 큰 영향을 주지 않았다.The structure of an LCD backlight unit (BLU) was simplified by installing a micro reverse-pyramid array (MRPA) or a micro reverse-cone array (MRCA) on the top surface of the light guide panel (LGP) in order to eliminate the conventional diffuser sheet and the prism sheet. The optimum conditions of the MRPA and the MRCA in the new light guide panel were obtained through optical simulation. The change of the luminance and view angle that depend on the side angle, the height, and the length at the top of the MRPA and MRCA were studied. The optimized side angle and the view angle of the MRPA and MRCA were 59 and 57 degrees for the side angles and 68 and 64 degrees for the view angles, respectively.

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Development of Hybrid Machining System and Hybrid Process Technology for Ultra-fine Planing and Micro Punching

Kim¹,

Jeon²,

Cha³

et al. 2013

Journal of the Korean Society of Manufacturing Process Engineer

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Ultra-fine planing and micro punching are separately used for improving surface roughness and machining dot patterns, respectively, of metal molds. If these separate machining processes are applied for machining of identical molds, there could be an aligning mismatch between the machine tool and the mold. A hybrid machining system combining ultra-fine planing and micro punching was newly developed in this study in order to solve this mismatch; hybrid process technology was also developed for machining dot patterns on a mirror surface of a metal mold. The hybrid machining system has X, Y, and Z axes, and a cam axis for ultra-fine planing. The cam axis and attachable and removable solenoid actuators for micro punching can make large and small sizes of dot patterns, respectively. Ultra-fine planing was applied in the first place to improve the surface roughness of a metal mold; the measured surface roughness was about 20nm. Then, micro punching was applied to machine dot patterns on the same mold. It was possible to control the diameter of the dot patterns by changing the input voltage of the solenoid actuator. Before machining, severe inhomogeneous plastic deformation around the machined dot patterns was also removed by annealing heat treatment. Therefore, it was verified that metal molds with dots patterns for optical products can be machined using a hybrid machining system and the hybrid process technology developed in this study.

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Modeling for New Type Backlight Units

Cited by 4 publications

References 2 publications

Study on the Optimization of the Optical Structure of Lenticular-Lens Films for LCD Backlight Applications

Study on the Optimization of the Optical Structure of Lenticular-Lens Films for LCD Backlight Applications

Optical Characteristics of Sheetless LCD Backlight Using Micro Reverse-pyramid Array

Development of Hybrid Machining System and Hybrid Process Technology for Ultra-fine Planing and Micro Punching

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