直下式LED背光模組偏振態之研究

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姓名

陳榕浩(Jung-Hao Chen) 查詢紙本館藏

畢業系所

光電科學與工程學系

論文名稱

直下式LED背光模組偏振態之研究
(The Polarization study for Direct type LED Back Light Module)

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摘要(中)

發光二極體(LED)已被普遍的使用在LCD背光模組上。但一般而言LED背光模組所發出的光被視為非偏振光(un-polarized light)，然而經由我們的實驗結果與研究分析，LED背光模組所發出的光是部分偏振(partial polarization)。本篇論文主要是經由實驗量測與研究分析來討論LED背光模組發光的部分偏振(partial polarization)狀態。
本研究是適當的利用此一特殊狀態來提升LCD模組亮度。經由本研究結果顯示，LCM的亮度至少可增加11%。
這篇論文對HD LCD亮度的提升,例如: 4k2k display,提供另一個新的參考。

摘要(英)

LED has been widely used in LCD backlight application. Generally speaking, the emitting light from LED backlight modules is considered as unpolarized light. However, based on our testing result and analysis, the emitting light from LED backlight modules is partially polarization. This thesis covers the discussion of partial polarization state of emtting light from LED backlight modules and the way to enhance the brightness of LED backlight modules by partial polarization.
The result shows the brightness can be increased at least 11%. This thesis can provide another new reference for enhancing brightness on hight definition LCD, ex; 4k2k Display.

關鍵字(中)

★ 直下式LED背光模組
★ 部分偏振
★ 背光模組
★ 液晶顯示器

關鍵字(英)

★ Direct type LED Back Light Module
★ Partial polarization
★ BLU(Back Light Unit)
★ LCD(Liquid Crystal Display)

論文目次

摘要.......................................................i
Abstract..................................................ii
誌謝.....................................................iii
目錄......................................................iv
圖目錄...................................................vii
表目錄....................................................xv
第一章緒論.................................................1
1.1 前言...................................................1
1.2 研究背景與文獻回顧.......................................1
1.3 研究目的................................................3
1.4 本研究之貢獻............................................6
1.5 論文架構................................................8
第二章基礎理論.............................................9
2.1 液晶顯示器介紹..........................................9
2.1.1 液晶（Liquid Crystal，LC）...........................10
2.1.2 液晶的光偏振現象.....................................11
2.1.3 TN扭轉型式向列技術（Twisted Nematic Mode）............12
2.1.4 STN超級扭轉式向列....................................14
2.1.5 TFT薄膜電晶體技術....................................14
2.1.6 彩色濾光片CF.........................................16
2.1.7 背光模組BL...........................................17
2.2 光的偏振...............................................18
2.3 布魯斯特角(Brewster’s angle)..........................23
2.4 經由反射形成的偏振-TM wave(或稱為P wave)與TE wave(或稱為S wave)反射率比較............................................27
2.5 偏振度(Degree of polarization)........................28
2.6 各種背光模組的光學膜功用.............................29
2.6.1 反射片(Reflector)...................................30
2.6.2 擴散板(Diffuser Plate or D.P.)......................30
2.6.3 擴散片(Diffuser Sheet or Diffuser Film or D.S.).....31
2.6.4 菱鏡增亮膜(Prism Sheet or BEF).......................33
2.6.5 多層增亮膜(Multilayer Optical Films or DBEF).........34
2.7 偏振介紹...............................................37
2.7.1 非偏振光/自然光(Un-polarized light)..................37
2.7.2 線性偏振光(Linear polarized light)...................38
2.7.3 圓偏振/橢圓偏振光(Circle /ellipse polarized light)....39
2.7.4 部分偏振光(Partially polarized light)................40
第三章研究方法與研究設備....................................41
3.1 研究方法...............................................41
3.1.1 前言................................................41
3.1.2 實驗方式.............................................41
3.2 實驗設備...............................................46
第四章實驗結果............................................48
4.1 單顆LED光源搭配不同光學膜之偏振態量測結果.................48
4.1.1 LED Light Source only 偏振量測.......................48
4.1.2 LED+DP..............................................51
4.1.3 LED+DS..............................................52
4.1.4 LED+BEF.............................................54
4.1.5 LED+DBEF............................................55
4.1.6 LED+DP+DS...........................................57
4.1.7 LED+DP+DS+BEF.......................................58
4.1.8 LED+DP+DS+BEF+DBEF..................................60
4.1.9 LED 搭配不同光學膜之偏振..............................61
4.2 背光模組光源加上Normal White Panel並搭配不同光學膜偏振態量測........................................................61
4.2.1 BLU+NWP量測.........................................61
4.2.2 BLU+NWP + DP量測....................................64
4.2.3 BLU+NWP + DS量測....................................65
4.2.4 BLU+NWP + BEF量測...................................67
4.2.5 BLU+NWP + DBEF量測..................................68
4.2.6 BLU+NWP + DS + DP量測...............................70
4.2.7 BLU+NWP + DS + DP + BEF量測.........................71
4.2.8 BLU+NWP + DS + DP + BEF + DBEF量測..................73
4.2.9 背光模組加上Normal White Panel並搭配不同光學膜.........74
4.3 一套48顆直下式LED背光模組偏振態量測......................74
4.3.1 一套24inch背光模組 LED only 量測Data..................75
4.3.2 一套24inch背光模組 LED & DP 量測Data..................93
4.3.3 一套24inch背光模組 LED & DP + DS 量測Data............111
4.3.4 一套24inch背光模組 LED & DP + DS + BEF 量測Data......129
4.3.5 一套24inch背光模組 LED & DP + DS + BEF + DBEF量測Data.....................................................147
第五章結論與展望..........................................165
參考文獻..................................................168
附錄光學膜規格...........................................170
附錄一：Diffuser Plate規格................................170
附錄二：Diffuser Sheet規格................................171
附錄三：Prism (BEF)規格...................................172
附錄四：DBEF 規格.........................................173

參考文獻

[1] 3M Co., http://www.3m.com/
[2] GIO opto electronic http://www.giotaiwan.com.tw/
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[6] George Harry Heilmeier http://www.displayblog.com/2009/05/01/george-heilmeier-lcd-inventor/
[7] AUO Co., http://www.auo.com.tw
[8] WIKIPEDIA http://en.wikipedia.org/wiki/Main_Page
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[10] 王薔、李國定、龔克”電磁場理論基礎”，五南圖書出版股份有限公司，chapter 7 (2003年2月初版一刷)。
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[12] Entire Technology CO., LTD http://www.entire.com.tw
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[16] TOPCON CORP., http://global.topcon.com/。中惠科技http://www.totalsmart.com.tw
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[18] Rosario Martínez-Herrero, Pedro M. Mejías, Gemma Piquero, “Characterization of Partially Polarized Light Fields”,Springer ,chp1.6 “Partially Polarized Gaussian Schell-Model Beams “ (2009).
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指導教授

張榮森(Rong-Seng Chang)

審核日期

2013-7-17

推文