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Student Number 92236005
Author Wei-Hung Kang(康為紘)
Author's Email Address No Public.
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Department Executive Master of Optics and Photonics
Year 2005
Semester 2
Degree Master
Type of Document Master's Thesis
Language zh-TW.Big5 Chinese
Title Novel design for a Direct Backlight Module
Date of Defense 2006-07-05
Page Count 96
Keyword
  • backlight module
  • direct-type
  • polarized light
  • Abstract In this paper, we will introduce two novel design methods for a direct backlight module. First, a direct backlight module with polarized reflector at Brewster’s angle is designed. The brightness and transmittance of this new module is simulated by using optical simulation software. The S-polarized component of the input light is reflected into the backlight system and the P-polarized component is transmitted through the reflector. The polarized reflector technology is to eliminate the absorption loss of dichroic polarizer of a LCD. The loss in the dichroic polarizer is reduced by the use of a backlight with polarized reflector which produces linearly polarized light output. The transmittance of polarizer of this backlight system is improved to 71.7%, compared to 43% of the conventional backlight. The brightness gain also shows 38% improvement.
    Finally, we will discuss the effect on light efficiency and irradiance uniformity for geometry modification of diffuser sheet and reflective sheet. The light efficiency and irradiance uniformity of Fresnel lens sheet and semi-circular diffuser sheet which composed of diffuser and prism function are also discussed here.
    Table of Content 中文摘要 -------------------------------------------------------------I
    英文摘要 -------------------------------------------------------------II
    誌謝 -------------------------------------------------------------------III
    目錄 -------------------------------------------------------------------IV
    圖目錄 ----------------------------------------------------------------VI
    表目錄 ----------------------------------------------------------------X
    第一章總論 ------------------------------------------------------1
       1.1研究背景-------------------------------------------------------------1
       1.2 研究目的-----------------------------------------------------------6
       1.3 研究方法-----------------------------------------------------------6
       1.4研究結果------------------------------------------------------------7
    第二章背光模組理論 ------------------------------------------9
       2.1光學原理 ----------------------------------------------------------9
    2.2光的偏振 ----------------------------------------------------------10
    2.3菲涅爾折射公式---------------------------------------------------13
    2.4布魯斯特角---------------------------------------------------------15
    2.5偏振程度------------------------------------------------------------16
    2.6輻射通量與光通量單位------------------------------------------17
    2.7Lambertian餘弦定律-理想漫射體-----------------------------18
    第三章偏極光反射板背光模組設計 -----------------------20
    3.1偏極光反射板與折射板之二維模組建立--------------------20
    3.2偏極光反射板與折射板之三維模組建立--------------------25
    3.3直下式背光模組模擬設定--------------------------------------29
    第四章偏極光反射板背光模組模擬與分析 --------------34
    4.1光均勻度的定義--------------------------------------------------34
    4.2模擬結果-----------------------------------------------------------35
    第五章直下式背光模組結構研究 --------------------------48
    5.1直下式背光模組簡介--------------------------------------------48
    5.2專利概述-----------------------------------------------------------49
    5.3新型背光模組結構設計與模擬--------------------------------48
    5.4模擬結果-----------------------------------------------------------51
    第六章結論 ----------------------------------------------------66
       6.1偏極光反射板背光模組設計 ---------------------------------66
    6.2直下式背光模組結構研究--------------------------------------67
    參考文獻 ------------------------------------------------------------69
    附件Polarized Backlight Design and Simulation -------------------71
    Reference [1] 趙凱華、鍾錫華,“光學”、儒林圖書公司
    [2] 紀國鐘、鄭晃忠,“液晶顯示器技術手冊” 、經濟部技術處發行
    [3] 黃建翔,“背光模組偏振態分析與增亮之應用”,國立中央大學光電所,碩
    士論文,民國94年
    [4] H.Tanase, J.Mamiya, M. Suzuki, H. Nakatani, T. Hatazawa, and T. Watanabe, “A
    New Backlighting System with a Polarizer Light Pipe for Enhanced light Output from
    LCDs”, SID Intl Symp. Digest Tech Papers, 365-368 (1997)
    [5] Hugo J. Cornelissen, H.P.M. Huck, Dirk J. Broer, S.J. Picken, C.W.M.Bastiaansen,
    E. Erdhuisen and N. Maaskant“Polarized Light LCD Backlight Based on Liquid
    Crystalline Polymer Film: A new Manufacturing Process”
    [6] 宇量,“如何降低液晶電視背光模組成本”、電子設計網
    (www.eedesign.com.tw)
    [7] 李柏聰"TFT-LCD製程與技術上課講議,交通大學光電所
    [8] 陳鴻滄、方育斌"LCD背光模組之產業趨勢技術發展及設計方式”
    [9] 呂立功 "工程數學應試手冊”
    [10] 李清祥,“非對稱式光注入下導光板之光學設計與研究”,國立交通大學光
    電所,碩士論文,民國94年
    [11] 戴銘成,“發光二極體背光模組照度與色彩均勻結構設計”,國立交通大學光電所,碩士論文,民國94年
    [12] 黃松輝、洪誌瑋、李姵隉A“LED光源運用於背光模組之介紹”,工研院光
    電所
    [13] 林清安、劉國彬,“Pro/ENGINEER Wildfire入門與範例” 、知城數位科技
    [14] Hecht,“Optics 4th edition” 、Person Education Inc.
    Advisor
  • Rong-Seng Chang(張榮森)
  • Files
  • 92236005.pdf
  • approve in 2 years
    Date of Submission 2006-07-13

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