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研究生： 謝天嘉
Tien-Ghin Hsieh
論文名稱： LED 7吋背光模組的設計
Design for LED 7-inch Backlight Module
指導教授： 黃惠良
Huey-Liang Hwang
口試委員:
學位類別： 碩士
Master
系所名稱： 電機資訊學院 - 產業研發碩士積體電路設計專班
Industrial Technology R&D Master Program on IC Design
論文出版年： 2007
畢業學年度： 95
語文別： 英文
論文頁數： 85
中文關鍵詞： 7 吋背光模組 、冷陰極管 、發光二極體 、RGB 發光二極體
外文關鍵詞： 7-inch LED Backlight module, CCLF, LED, RGB LED
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    • 背光模組從液晶顯示器(LCD)背面發光，一般來說，包括一個光源及光學組件。大多的液晶顯示器背光都使用冷陰極螢光燈管(CCFL)來達到此一目的，但是現在我們更換成LED。 在本論文中，我們只有更換CCFL光源為LED。我們使用AutoCAD軟體來建立7吋背光模組,而且我們用TracePro來分析7吋背光模組的光學特性。
    模擬7吋背光模組的四個步驟: 步驟一: AutoCAD中建立7吋背光模擬。步驟二: TracePro軟體中使用CCFL來當背光模組的光源得到均勻的出光面。步驟三: 取代CCFL，我們用白光LED做背光模組的光源。步驟四: 使用紅、綠及藍三色LED產生白光。
    最後，我們可以得到三種型式的７吋背光模組。這三種型式的７吋背光模組分別是CCFL背光模組、白光LED背光模組及紅綠藍三色LED背光模組。

    Backlights illuminate the LCD panels from the rear, and generally consist of a light source and optical components. Mass LCD backlights have used cold-cathode florescent lamps (CCFL) for this purpose, but now we are switching to LEDs. We only convert the light source of CCFL into LEDs. We use AutoCAD software to establish 7-inch backlight modules and analyze optical characteristics of 7-inch backlight modules in TracePro software.
    Four steps for designing LED 7 inch backlight are below: Step one: Model 7-inch backlight modules in AutoCAD. Step two: Find the uniform output plane using CCFL light source in TracePro software. Step three: Instead of CCFL, we use White LED for light source. Step four: Use three RGB colors LEDs generating white light.
    Finally, we can get three types of 7-inch backlight modules. Three types of 7-inch backlight modules are CCFL backlight modules, White light LED backlight modules, and Three RGB colors LED backlight modules.

    Chapter I Introduction 1.1 Overview………………..………………………………………1 1.2 Motivation…………….……………………………………..…4 II Basic Theory 2.1 Light behaves………….……………………………………….8 2.1.1 SNELL’S LAW OF REFLECTION AND REFRACTION……..……….………………………………8 2.1.2 TIR (Total Internal Reflection)…………………………..14 2.2 Backlight Light Source……………………………………….16 2.2.1 Light Source of CCFL…………………………………….16 2.2.2 White-light sources based on LEDs……………...………17 Method 1: Blue LEDs + Yellow phosphor…...….17 Method 2: Red, Green, and Blue LEDs to Generate White Light……………18 2.3 The Lambertian Emission Pattern…………………………..19 2.4 Color mixing-Addition of Colors……………………...…….23 III DESIGN AND OPTIMIZATIONS 3.1 Design Backlight Model Flow Chart……………………..….29 3.2 Model 7-inch Backlight in AutoCAD……………………..…31 3.3 Find the Uniform Output Plane of CCFL Backlight………39 3.3.1 RepTile shapes: Rectangular and Staggered Rectangular……………..…39 3.3.2 Dot Patterns Distribution of CCFL Backlight……….….44 3.4 LED Backlight………………………………………………..51 3.4.1 Establish LED Module in AutoCAD Software…………..51 3.4.2 Set Parameters of LED Model in TracePro…………..…54 3.4.3 LED Backlight Module……………………...……………60 3.5 RGB Backlight Module………………………………………67 IV Results and Discussion 4.1 7-inch CCFL Backlight………………………………………74 4.2 7-inch White LED Backlight Case…………………………..78 4.3 7-inch RGB LED Backlight Case……………………………80 V Conclusion and Future Works…………………………………82 Reference……………………………………………………………….84

    References

    [1] Hassaun Jones-Bey, “HIGH-OUTPUT LEDS: Solid-state lighting seeks a role in pictures”, 2006
    [2] RoHS. 2007. http://www.rohs.gov.uk/
    [3] Takuya Otani, “LED Backlightsboost LCD TV color,” Nikkei Electronics Asia,March 2005
    [4] 寧靜 , “液晶電視用LED背光模組發展動向” 電子設計資源網http://www.eedesign.com.tw/article/forum/fo840.htm , 2005
    [5] David Halliday、Robert Resnick、Jearl Walker, Fundamentals of Physics, 7th Edition, John Wiley & Sons.
    [6] Ming-Che Kuo, “The Study of Compound-Segmented LED Backlight Modules For All Size LCD Panels”, 大同大學 光電工程研究所 碩士論文, 2005.
    [7] HARISON TOSHIBA KIGHTING. 2004. Cold Cathode Fluorescent Lamps. http://www.harison.co.jp/pro/cold/001_e.html
    [8] E. Fred Schubert, Light-Emitting Diodes, Cambridge university press, SECOND EDITION.
    [9] Philips Luileds Lighting Company, http://www.lumileds.com/
    [10] 瑞儀光電 http://www.radiant.com.tw/
    [11] TracePro 快速學習手冊，訊技科技股份有限公司
    [12] TracePro Software for Opto-Mechanical Modeling, Lambda Research Corporation, User’s Manual Release 3.0
    [13] Yu-Bin Fang, “The Optimization of Optical Design for LCD Backlight Module”, 國立成功大學 工程科學系 碩士學位論文, 2004.
    [14] Andreas Stich, “LEDs, New Light Sources for Display Backlighting, Application Note”, Osram Opto Semiconductors, 2004.

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