• Title/Summary/Keyword: Micro Fresnel Lens Array

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Design of LCD Backlight Unit Coupled with Micro Fresnel Lens Array (배열형 소형 프레넬 렌즈가 결합된 LCD 백라이트의 설계)

  • Jeong, Man-Ho
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.20 no.2
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    • pp.1-7
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    • 2006
  • A light guided plate coupled with the micro Fresnel lens array(MFTA) is designed to improve the efficiency of the LCD backlight unit. Blazed Frenel lens and binary multi-level Fresnel lens are adapted for the MFLA. This type of MFLA can replace the prism sheet and diffuser sheet which are used for the conventional type of the LCD backlight unit. The luminance and uniformity are calculated to verify the performance of the MFLA type LCD backlight unit.

Design of Backlight Unit using Micro Fresnel Lens Array (Micro Fresnel Lens Array를 이용한 Backlight Unit 설계)

  • Ryu, Jae-Sun;Jeong, Man-Ho
    • Korean Journal of Optics and Photonics
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    • v.16 no.3
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    • pp.217-224
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    • 2005
  • A light-guide plate of an LCD backlight coupled with a microfresnel lens array (MFLA) is designed and analyzed. Computer simulated results of optical characteristics of our MFLA-type light-guided plate compared with the conventional prism-type one are presented. We show that the MFLA-type light-guide plate can replace well the conventional prism-type plate.

A Study on the Mechanical Micro Machining System set-up and Applications (기계적 미세 가공 시스템 구성 및 응용 연구)

  • 제태진;이응숙;최두선;이선우
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2001.04a
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    • pp.934-937
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    • 2001
  • It is well-known that the micro fabrication technology of micro parts are the high energy beam or silicon-based micro machining method such as LIGA Process, Laser machining, photolithography and etching technology. But, for fabricating complex 3-D structure it is better to use mechanical machining. This machining method by the mechanical machine tool with nanometer accuracy is getting attention in some field-especially micro optics machining such as grating, holographic lens, micro lens array, fresnel lens, encoder disk etc.. In this study, we survey the micro fabrication by mechanical cutting method and set up the mechanical micro machining system. And we carried out micro cutting experiments for micro parts with v-shape groove.

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A study of burr formation on microgrooving for fresnel lens mould (프레넬렌즈 금형용 미세홈 가공에 있어서 버 발생 경향에 관한 연구)

  • 임한석;안중환
    • Journal of the Korean Society for Precision Engineering
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    • v.14 no.3
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    • pp.28-34
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    • 1997
  • The side burrs and shape distortion resulting from the micromachining of an array of V-shape microgrooves in fresnel lens mould were experimentally invesigated. The focus of this study is on the influence of depth of cut and prism angle on the burr growing rate. The main experiments were con- ducted on the single prism cutting for the convinient of measuring the burr shape and cutting force. From the observation of the burr shape and burr growing rate, it was found that there exits a critical depth of cut below which the burrs are more or less irregular and weak. But above that critical value, the burrs are re- latively clear and stiff.

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