臺灣博碩士論文加值系統

摘　　要
由於發光二極體(LED)技術提升，其亮度與色彩飽和度未來發展更近一步，LED開始被運用於液晶顯示器的背光模組光源。但由於LED屬於點光源，要如何使其成一均勻面光源，對於直下式LED背光模組來講，RGB LED要如何發展成均勻面光源是一個重要的問題，因為容易產生出光不均勻的現象，本研究之目的是使用ASAP 2005光學模擬軟體來探討擴散板對LED混光影響參數最佳化設計。
多數人都認為LED為一單色光，然而，一顆工業用的LED所顯現出的是多種顏色的特性，用於背光模組時可依需要對LED做不同封裝或對於置放方式作特殊設計，其與液晶顯示器的色彩濾波片的頻率匹配良好，當使用R、G、B三色LED為光源時，三色波長在色度圖上可以拉開一個比CCFL更大的一個混光範圍，所以在色彩飽和度方面比CCFL表現更好，已知，擴散板的霧度與入射光的波長有關。除了波長的影響之外，還包括散射粒子大小、散射子濃度、相對折射率、擴散板厚度等等，都是會影響混光結果的參數，在本研究中，將所有會影響混光結果的變數，再加上LED的排列方式、與擴散板之間的距離，針對這些變數以全因子方法做模擬，找出最佳組合的條件
擴散板內有散射粒子， 光線在經過擴散板時會不斷的在兩個折射率相異的介質中穿過，在此同時光線就會發生許多折射、反射與散射的現象，如此便造成了光學擴散的效果，增加光的平均自由路徑使混光效果更均勻，以提升背光模組的照度及色彩均勻度，使用上述參數的結果得到一個最佳組合達成均勻亮度和顏色的平面光源。

ABSTRACT

Due to the evaluation of Light Emitting Diodes (LEDs) technologies, their performance in both luminance and color saturation are pushed further to the edge. This leads to their applications in Backlight Units (BLUs) designs. However, LEDs are point light sources. How to convert point light sources into a surface light source has become one of the most important issues in the BLU industry. For direct-type LED BLUs, R, G, B color mixing has become a topic of interest because of the problem of non-uniformity of color. The problem is further complicated by incorporating the scattering effect of diffuser plates in direct-type LED BLUs designs. This study is aimed to resolve this problem by a well-performed optical model for diffuser plates programming in ASAP.
LEDs are considered by most to be monochromatic light sources. However, a commercial LED exhibits multichromatic characteristic. As known, the hazing effect of a diffuser plate is related to the wavelength of the incident light. Therefore, the wavelength effect as well as other effects, such as the diameters of scatters, the concentration of scatters, the relative refractive indices, and the thickness of a diffuser plate, etc., all play a part in color mixing. In this study, all above effects on LED coloring mixing are investigated thoroughly. The arrangements of LEDs and the distance between a diffuser plate and LEDs all contributing to the non-uniformity of color, in addition to the effects of diffuser plate, are also under investigation.
A surface light source with uniform luminance and color is achieved by using a optimal combination of the above parameters.

目　　次
摘要 iv
英文摘要 v
誌謝 vi
目次 vii
表目錄 viii
圖目錄 xi
第一章 序論 1
1.1 引言 1
1.2 現有背光模組簡介 2
1.3文獻回顧 3
1.4問題描述 6
1.5預期目標 6
第二章 色彩學與光學之理論概述 8
2.1色彩學基本概念 8
2.1.1 人眼視覺 8
2.1.2 人眼構造 9
2.1.3 CIE標準色度學系統演進 10
2.1.4 混色 13
2.1.5 色溫 14
2.1.6 色差 16
2.1.7 光源演色性 18
2.1.8 色彩的量測儀器 18
2.1.9 光度測量單位 21
2.1.10 色彩管理sRGB規範 22
2.2 光的基本概念 23
2.3光學原理 24
2.4散射 25
2.4.1 BSDF 27
2.4.2 擴散板原理 28
第三章 模擬概述 29
3.1模擬架構 29
3.2 LED的色度分析 29
3.2.1 建立光源 29
3.2.2 三原色混光基礎分析 33
3.2.3 LED混光基礎分析 35
3.2.4 LED排列方式基礎分析 39
3.3 擴散板的選擇 43
3.3.1 散射子的應用 43
3.4 分光膜的基礎分析 46
第四章 直下式背光模組架構模擬分析 50
4.1 基本架構 50
4.2分光膜用於背光模組 51
4.3直下式背光模組均勻度模擬分析 54
4.4模擬結果 65
4.5色彩均勻度分析 67
第五章 結果與討論 68
參考文獻 70

參考文獻
1.方育斌” LCD 背光模組之光學最佳化設計，國立成功大學研究所碩士論文
2.柯俊宇，LEDs發光光譜校正，國立中央大學光電科學研究所碩士論文
3.林宏森，以RGB發光二極體為LCD背光源之光學迴授補償，國立中央大學光電科學研究所碩士論文
4.Armand Perduijn,Sjef de Krijger,John Claessens,Noboru Kaito,Takaaki Yagi,S.T. Hsu,Masayuki Sakakibara,Tsutomu Ito, Shinsuke Okada “Light Output Feedback Solution for RGB LED Backlight Applications” SID 03 PP.1254-1257
5.Gerard Harbers,Christoph Hoelen “High Performance LCD Backlighting using High Intensity Red, Green and Blue Light Emitting Diodes.” SID 01 PP.702-705
6.Seiji Sakai, Akihiro Mori, Kazuhiro Ishiguchi, Kazuhiro Kobayashi, Toru Kokogawa,Takuya Sakamoto,Toshiyuki Yoneda“A Thin LED Backlight System with High Efficiency for Backlighting 22-in. TFT-LCDs” SID 04 pp.1218-1221
7.Yourii Martynov, Huub Konijn, Nicola Pfeffer, Simon Kuppens and Wim Timmers “High-efficiency Slim LED Backlight System with Mixing Light Guide”SID 03 pp.1259-1261
8.戴銘成 發光二極體背光模組照度與色彩均勻化結構設計 國立交通大學 中華民國九十四年
9.Robert Scott West,Huub Konijn, Willem Sillevis-Smitt, Simon Kuppens, Nicola Pfeffer, Yourii Martynov,Yagi Takaaki,Stefan Eberle, Gerard Harbers,Tien Wei Tan, Choon Earn Chan “High Brightness Direct LED Backlight for LCD-TV”SID 03 PP.1262-1265
10.林大川，”色彩學概論”，全華科技圖書
11.大田 登，基礎色彩再現工程
12.Takuya Otani，”LED背光源提升LCD TV色彩”，Nikkei Electronics Asia，2005-3,Vol.14 No.3
13.Che-Ming Chang, Yi-Chin Fang, Chen-Rong Lee” A new design mixing R.G.B. LED (Red, Green, Blue Light Emitting Diode) for a modern LCD (Liquid Crystal Display)backlight system” Proc. of SPIE Vol. 6338 63380Q-1
14.C. Hoelen,” Color tunable LED spot lighting” Proc. of SPIE Vol. 6337 63370Q-1
15.Jin-Ha Kim,” High Efficiency Trichromatic LED Backlight for Mobile LCDs” Proc. of SPIE Vol. 6134 613409-1
16.Tasso R. M. Sales,” LED illumination control and color mixingwith engineered diffusers™” Proc. of SPIE Vol.5530 ,2004, p 133-140
17.Harald Ries,” Mixing colored LED sources” Proc. of SPIE Vol. 5186 ,2003, p 27-32
18.Feng Zhao,” Optical elements for mixing colored LEDs to create white light” Proc. of SPIE Vol. 4776, 2002, p 206-214
19.Ivan Moreno,” Cluster configurations of red, green, and blue LEDs for white light Illumination” Proc. of SPIE Vol. 5739
20.Paul C.-P. Chao,” Design of a novel LED lens cap and optimization of LED placement in a large area direct backlight for LCD-TVs” Proc. of SPIE Vol. 6196, 2006, p 61960N
21.Nadarajah Narendran,” Characterizing LEDs For General Illumination Applications:Mixed-color and phosphor-based white sources”, Proc.of SPIE Vol. 4445,2001
22.Regina Mueller-Mach and Gerd O. Mueller,” White light emitting diodes for illumination” Proc.of SPIE Vol. 3938 ,2000
23.Iven Moreno，”Design of LED spherical lamps for uniform far-field illumination”，Facultad de Fisica,Universidad Autonoma de Zacatecas,98060,Zacatecas,Zac.,Mexico，SPIE
24.R.S.West，”High Brightness Direct LED Backlight for LCD-TV”，Lumileds Lighting ,20000 Victor Parkway Suite100 Livania,Michigan,USA
25.http://www.lumileds.com/
26.Eugene Hecht, “Optics,” Addison-Wesley, third edition, 1998.
27.Berns, R.S., Principles of Color Technology, John Wiley & Sons,Inc.(third edition), 2000.
28.陳君彥（2000），色彩量測，科儀先知，新竹：國科會精密儀器發展中心，pp.87-98
29.山中俊夫，色彩學的基礎
30. Lun-De Liao , Chi-Wei Chiu , Paul C.-P. Chao “Design of a Novel LED Lens Cap and Optimization of LED Placement in a Large Area Direct Backlight for LCD-TVs”
31.M. Anderson, et al., " Proposal for a Standard Default Color Space for the Internet- sRGB ", Proc. IS&T/SID Color Imaging Conf.
32.陳鴻興，中華印刷科技學會會訊第66期
33.http://www.benq.com.tw/
34.Breault Research http://www.breault.com/
35.Peter A.Keller,”Electronic Display Measurement” John Wiley & Sons,Inc.
36.穎台科技，http://entire.myweb.hinet.net/about1.html
37. http://content.edu.tw/junior/phy_chem/tp_ct/lab/252/light2.htm