Initial Photometric and Spectroscopic Characteristics of 55-inch CCFL and LED Backlights for LCD-TV Applications

Ko, Jae‐Hyeon; Ryu, Jin-Sun; Yu, Mi-Yeon; Park, Seung-Mi; Kim, Sujin

doi:10.5207/jieie.2010.24.3.008

Cited by 6 publications

(2 citation statements)

References 2 publications

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“…도광판은 측면에서 입사되는 빛을 전반사(total internal reflection) 현상으로 유도하는 과정 에서 밑면에 형성되어 있는 산란 패턴을 활용해 전반사 조건 을 깨뜨리며 LCD 패널 쪽으로 빛을 보낸다. 최근 대형 LCD TV에 엣지형 LED 백라이트가 적용되기 시작하면서 도광판 기술의 중요성이 부각되고 있다 [2][3][4][5] . 빛에 대한 확산과 집광 효과를 담당하는 광학필름으로는 각각 마이크로 렌즈형 확 산필름(Diffuser Sheet, DS) [6] 과 프리즘필름(Prism Sheet, PS) [7] 이 대표적이다.…”

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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“…The importance of BLU technology has been increased recently because of its key role in the innovation of LCD, in particular, its largesize applications. Recent large-size LCD TV's adopt not only direct-lit but also edge-lit LED(light emitting diode) backlights the latter making the TV much slimmer and lighter along with reducing power consumption [2][3]. Moreover, dynamic driving of BLU may be adopted to improve the picture quality of LCD substantially.…”

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Experimental and Simulation Study of the Optical Performances of a Wide Grid Polarizer as a Luminance Enhancement Film for LCD Backlight Applications

Seo

Yeom

2012

Journal of the Optical Society of Korea

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Reflective polarizers can be used as luminance enhancement films for LCD backlights via the polarization recycling process. The optical performances of a wire grid polarizer (WGP) as a reflective polarizer adopted in edge-lit backlights were investigated by luminance evaluation and a time-domain simulation technique. The results were compared to those of a commercial dielectric multilayer film. The luminance gain factor of WGP was smaller than that of the multilayer film by 18%. This was attributed to a much larger internal loss of WGP due to light absorption by metal wires. The internal losses of both reflective polarizers and the polarization conversion efficiency of the backlight were obtained numerically based on a phenomenological model. The optical performances of WGP were optimized by using a time-domain simulation technique. The luminance gain increased and was found to become comparable to, but slightly less than the case of the dielectric multilayer film with decreasing line width.

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Liquid Crystal Display Components

Yang

2014

Fundamentals of Liquid Crystal Devices

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Initial Photometric and Spectroscopic Characteristics of 55-inch CCFL and LED Backlights for LCD-TV Applications

Cited by 6 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

Experimental and Simulation Study of the Optical Performances of a Wide Grid Polarizer as a Luminance Enhancement Film for LCD Backlight Applications

Liquid Crystal Display Components

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