液晶顯示器具有高亮度，厚度薄的優點。為了達到厚度薄，均勻度佳的要求，設計一個符合要求的背光模組是重要的。本文主要介紹如何利用Trace Pro光學模擬軟體，針對液晶顯示器背光模組的擴散板進行模擬、分析及設計。相對於側光式背光模組，直下式背光模組構造就較為簡單，其主要光學元件為反射板、擴散片、冷陰極管及稜鏡片。其中位於模組下方的反射板主要用途為收集並反射來自於光源的光線，使其向背光模組上面射出，以增加螢幕亮度。擴散片及稜鏡片之功用則如同光側光式背光模組中的擴散片及稜鏡片一樣，分別是將光線散射並使其均勻化以提高螢幕亮度。當背光模組厚度越來越薄時，其輝度之不均勻性也會越來越大，因此光學設計則將越來越具有挑戰性。本文主要設計是以高均勻度擴散板加上微粒子的分佈，來探討背光模組所能呈現的光均齊度。
設計一系列具有回覆反射陣列的模組，軟體Trace Pro被使用來設計回覆反射陣列的幾何結構合模擬光學路徑，模擬量測設計的結果，並討論其特性。

The liquid crystal display is high light, the advantage thin in thickness. In order to reach the thickness thinly, the request good in degree of consistency, it is important to design a qualified mould group in a poor light. This text introduces how to utilize Trace Pro optics to imitate the software , imitating to the diffusion board of the mould group in a poor light of the liquid crystal display , analysis and designing mainly. To the sidelight type mould group in a poor light, go to type in a poor light mould group construct comparatively simple , main optics for reflect board , spread scene , cold cathode tube and arris lens component its directly. The main use of reflection board lying below the mould group among them , in order to collect and reflect the light that come from the light source, make it penetrate above to in a poor light mould group, in order to increase the luminance of screen. Spread slice and function , arris of lens and the arris lens like mere sidelight type in a poor light mould diffusion slice of group, make their even to take in order to raise the luminance of screen light scattering separately. When the mould group in a poor light is thinner and thinner in thickness, brightness its disparity can more and more heavy too, so optics design more and more challenging. This text designs mainly to spread the distribution that the board adds the particle son to with the high degree of consistency, is it probe into in a poor light mould light neat degree that group can appear to come.

Design a series of and reply the mould group which reflect the array, software Trace Pro is enabled being used for designing and replying the geometry structure which reflects the array and shut in the simulation optics route , analog quantity examines the result designed, and discuss its characteristic.

目錄
目錄…………………………………………………………………………..i
圖目錄……………………………………………………………………….v
表目錄………………………………………………………………………viii
符號說明……………………………………………………………………..ix
摘要…………………………………………………………………………..xi
Abstract……………………………………………………………………...xii
第一章 緒論………………………………………………………………….1
1-1 前言(研究動機)…………………………………………………………1
1-2直下式背光模組概述……………………………………………….1
1-2-1直下式背光模組結構簡介……………………………………..3
1-2-2直下式背光模組光源介紹……………………………………..5
1-2-3直下式背光模組技術趨勢……………………………………..6
1-3 光學擴散板成型技術………………………………………………7
1-4 文獻回顧............................................................................................7
1-5 論文架構……………………………………………………………9
第二章 直下式背光模組光學相關理論…………………………………...18
2-1直下式背光模組光波的傳播……………………………………...18
2-2直下式背光模組光學原理………………………………………...20
( i ) 折射定律………………………………………………………20
( ii ) 反射定律………………………………………………………21
( iii ) 全反射定律…………………………………………………..21
( iv ) Lambertian 餘弦定律─理想漫射體………………………..22
2-3光學單位…………………………………………………………..24
2-3-1.光通量………………………………………………………...24
2-3-2.光強度.......................................................................................25
2-3-3.輝度及照度…………………………………………………...25
2-3-4.均齊度.......................................................................................26
2-4 Trace Pro光學軟體介紹…………………………………………..26
2-4-1 Trace Pro 的描光與運算方式……………………………….27
2-5 直下式背光模組的光學規格…………………………………….38
2-5-1直下式背光模組光學原理說明……………………………...39
2-5-2 光學擴散板設計與結構分析..................................................40
2-5-3 光源…………………………………………………………..40
2-5-4 光學設計……………………………………………………..42
第三章 模擬結果與分析…………………………………………………...46
3-1 分析軟體…………………………………………………………..46

3-2 分析流程…………………………………………………………46
3-3 背光模組模擬設定........................................................................46
3-3-1 擴散板材料設定……………………………………………46
3-3-2 燈管設定……………………………………………………47
3-3-3 反射板設定............................................................................48
3-3-4 觀察面設定…………………………………………………48
3-3-5 微粒子於PMMA擴散板之光路分析....................................49
3-4 模擬結果…………………………………………………………49
3-4-1 背光模組模型建立…………………………………………49
3-4-2 PMMA未加微粒子之情況………………………………….50
3-4-3 PMMA加微粒子之情況(直徑D=0.2mm)…………………..50
(1) 間距Sx、Sz=2.5，單層微粒子之影響(一)……………50
(2) 間距Sx、Sz=2.5，二層微粒子之影響(二)……………51
(3) 間距Sx、Sz=2.5，三層微粒子之影響(三)……………52
(4) 間距Sx、Sz=2.5，四層微粒子之影響(四)…………….52
3-4-4 PMMA加微粒子之情況(直徑D=0.4mm)…………………..53
(1) 間距Sx、Sz=2.5，單層微粒子之影響(一)……………53
(2) 間距Sx、Sz=2.5，二層微粒子之影響(二)……………53
(3) 間距Sx、Sz=2.5，三層微粒子之影響(三)……………54
(4) 間距Sx、Sz=2.5，四層微粒子之影響(四)……………55
3-4-5 PMMA加微粒子之情況(直徑D=0.9mm)…………………..55
(1) 間距Sx、Sz=2.5，單層微粒子之影響(一)……………55
(2) 間距Sx、Sz=2.5，二層微粒子之影響(二)……………56
(3) 間距Sx、Sz=2.5，三層微粒子之影響(三)……………57
(4) 間距Sx、Sz=2.5，四層微粒子之影響(四)……………57
3-4-6 PMMA加入微粒子之情況(縮減板厚及微粒子間距)………58
3-5 模擬結論………………………………………………………..76第四章 結論及未來展望…………………………………………………...78
4-1 結論……………………………………………………………..78
4-2 未來展望………………………………………………………..78
參考文獻…………………………………………………………………….80

[1]馮致華，2004，“背光模組照度均勻化結構的設計”，國立交通大學光電工程研究所碩士論文。

[2]方育彬，2004，“LCD 背光模組之光學最佳化設計” ，國立成功大學工程科學研究所碩士論文。
[3]蔡俊欽，2004，“導光板光學設計及製程之最佳化研究” ，國立高雄應用科技大學模具工程研究所碩士論文。
[4]紀巽淵，2007，“區塊型背光模組應用於大尺寸LCD之研究”，私立大同大學光電研究所碩士論文。
[5]陳明湶，2007，“直下式背光模組輝度均齊度改善”，私立南台科技大學光電工程研究所碩士論文。
[6] B. Sanchagrin, “ Process Control of Injection Molding”, Polymer Engineering and Science, Vol. 23, No. 8, pp. 431-438, 1983。
[7] J. Greener, “ General Consequence of the Packing Phase in Injection Molding”, Polymer Engineering and Science, Vol. 26, No. 12, pp. 886-892, 1986。
[8] H. W. Cox and C.C. Mentzer, “ Injection Molding: The Effect of Fill Time on Properties”, Polymer Engineering and Science, Vol.26, No.1, pp.488-498, 1986。
[8] D.Pierick and R.Noller, “ The Effect of processing Conditions on shrinkage”,Society of Plastics Engineers, ANTEC, pp.252-258, 1991.
[9] O. Vaatainen, P. Jarvela, K. Valta, and P. Jarvela, “ The Effect of Processing Parameters on the Quality of Injection Molded Parts by Using the Taguchi Parameter Design Method”, Plastics, Rubber and Composites and Applications,Vol. 2, No. 4, pp. 211-217, 1994。
[10] J. McKenzie, R. L. Schaefer, and E. Farber, “ The Student Edition of Minitab forWindows: Statistical Software Adapted for Education”,Addison-Wesley PublishingCompany, Inc., Reading, Massachusetts, 1995。
[11]K. Kashimu, N. Yoshida, O. Shoji, E. Yanagi, and T. Fukunishi, “Back
Lighting device for a panel“,US-PATENT 5093765, 1992。
[12]K .Yokoyama, T.Ishikawa, and K. Watai,“Surface illuminant
device”,US-PATENT 5402324, 1995。