臺灣博碩士論文加值系統

本論文主要以提升發光二極體之色純度為主題，研究並製作光學濾光片應用到紅、藍、綠光發光二極體上，再以量測儀器觀察發光光譜半高寬之縮減程度以評估濾光片提升色純度之效果，並利用CIE 色度座標之色域範圍評估在提高色純度後，對於色域之改善程度。而色域範圍之定義以美國國家電視系統標準委員會(NTSC)所制訂之色彩範圍為100%，並以此標準作為色域之比較。
論文中針對紅、藍、綠光發光二極體之綠光半高寬過寬，且藍、綠光有混合區之問題，利用光學模擬軟體設計綠光窄帶濾光片、藍綠混合區截止濾光片與三色窄帶濾光片，再利用光學鍍膜機以TiO2和SiO2為蒸鍍鍍材料來製作。
實驗結果以三色窄帶濾光片對於提升發光二極體色純度之效果最好，而最佳之基板為0.4mm玻璃，三色窄帶濾光玻璃在軸向光時可將紅、藍、綠光之半高寬縮減至17nm以下，而且可使CIE座標之色域範圍由原本之118.41% NTSC，提高至132.56 % NTSC。另外發現本實驗之濾光片在側向光應用時是不適用的，主要是受到結構性漏光與發光角度不同之問題所致。

The main objective of this thesis is to study on how to improve the color-purity of LEDs, design and develop the optical filter to apply on RGB LEDs. Using measuring equipments to measure the spectrum and check the effects of improving the color-purity of LEDs. And estimating the effects on color gamut after improving the color-purity of LEDs by check the space on the CIE chromaticity coordinates. The standard color of space that had been approved by the National Television System Committee (NTSC) is used as the reference and defined as 100%.

About the FWHM (Full Width Half Maximum) of Green light is too wide and there is mixed-zone between blue and green light in the RGB LEDs spectrum, we design green light narrow band-pass filter, mixed-zone band-stop filter and RGB narrow band-pass filter by optical design software. And we use the materials of TiO2 and SiO2 to make the filter film by thin film evaporation equipment.

From the experiment, we have found the results as following:
1. The RGB-narrow-band-pass-filter is the best one for improving the LED color purity, and the 0.4mm-glass is the best substrate.
2. The FWHM of red, green and blue light were decreasing under 17nm in axial light measurement after RGB-narrow-band-pass-filter apply on LEDs, and the range of color gamut was increasing from 118.41% to 132.56% according to NTSC standard.
3. The limitation of this study is that the filters in our experiments can not be effective for lateral light because of the light leaking from cross-section of LED chip and the different incident angle of light.

目錄

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致謝辭............................................i
中文摘要.........................................ii
英文摘要........................................iii
目錄.............................................iv
圖目錄..........................................vii
表目錄..........................................xii

第一章、緒論......................................1
1.1研究背景...............................1
1.2研究目的與方向.........................3
1.3論文架構...............................4
第二章、相關理論..................................6
2.1白光發光二極體相關原理.................6
2.1.1光源專有名詞解釋.................6
2.1.2CIE色度座標......................8
2.1.3演色性..........................10
2.1.4液晶顯示器用背光源分析比較......11
2.1.5白光LED製造方法.................14
2.2窄帶濾光片設計原理....................18
2.2.1簡易之通帶濾光片設計方法........18
2.2.2 Fabry-Perot型窄帶濾光片........22
2.2.3多腔型窄帶濾光片................25
2.2.4多腔型窄帶濾光片設計與比較......26
2.3物理氣相蒸鍍相關原理..................31
2.3.1電子束蒸鍍法....................31
2.3.2電子束的產生....................32
2.3.3電子束的加速....................32
2.3.4電子束蒸鍍之特點................33
第三章、實驗設備與儀器...........................35
3.1蒸鍍系統..............................35
3.1.1真空系統........................36
3.1.2鍍膜系統........................37
3.1.3膜厚監控系統....................38
3.2 N & K光學量測系統....................39
3.3電激發光光譜量測系統..................41
3.4光電特性量測系統......................41
3.5積分球量測系統........................43
第四章、實驗流程與方法...........................44
4.1基礎數據實驗規劃......................44
4.2濾光片之模擬設計與製作規劃............46
4.3鍍膜條件與手法........................51
4.4實驗流程..............................53
4.5基板清潔與後處理......................55
第五章、實驗結果與結論...........................56
5.1基礎數據實驗結果......................56
5.2綠光窄帶濾光片實驗結果................62
5.3藍綠混合區截止濾光片實驗結果..........71
5.4三色窄帶濾光片實驗結果................85
5.5濾光片之色純度提升效果比較............99
5.6CIE座標色域範圍.....................100
5.7結果與討論...........................103
第六章、結論與未來展望..........................105
6.1結論.................................105
6.2未來展望.............................106
參考文獻........................................107

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