臺灣博碩士論文加值系統

發光二極體可應用於液晶螢幕顯示器之背光源，因此本論文首先分析了發光二極體的發光特性，並且進行各種驅動調光電路的分析比較，得知定電流脈波寬度調變驅動調光方式有效率佳、架構簡單、調光效果良好的優點。而本論文更提出ㄧ高低準位定電流脈波寬度調變的方法，不僅具有定電流脈波寬度調變的優點，更可保持發光二極體持續在導通狀態之下。最後實際研製一三級架構驅動調光電路，量測及分析不同順向電流對發光二極體主波長漂移、色座標漂移及輝度等發光特性的影響。

Light emitting diode is suitable to be the backlight source of liquid crystal display. So, in this thesis the analysis of luminescence characteristics of light emitting diode was made. With the analysis and comparison of driver circuits, the conclusion can be made that when the light emitting diode is driven with pulse width modulation constant current has the advantages of higher efficiency, simple topology and good luminescence modulation. Then, in this thesis the high-and-low level constant current in pulse width modulation mode is addressed. It not only has the advantages of the driver circuit with pulse width modulation constant current, but keeps light emitting diode constantly conduction. Finally, a three-stage driver circuit is made, and the influences on the luminescence characteristics of light emitting diode under different forward current such as domain wave drift, color coordinates drift and luminance are measured and analyzed.

目 錄
中文摘要．．．．．．．．．．．．．．．．．．．．．．．．． I
英文摘要．．．．．．．．．．．．．．．．．．．．．．．．． II
誌 謝．．．．．．．．．．．．．．．．．．．．．．．．．． III
目 錄．．．．．．．．．．．．．．．．．．．．．．．．．． IV
圖目錄．．．．．．．．．．．．．．．．．．．．．．．．．． VI
表目錄．．．．．．．．．．．．．．．．．．．．．．．．．． X
第一章 緒論
1.1 研究背景．．．．．．．．．．．．．．．．．．．．． 1
1.2 研究目的與方向．．．．．．．．．．．．．．．．．． 2
1.3 論文大綱．．．．．．．．．．．．．．．．．．．．． 4
第二章 液晶螢幕背光模組
2.1 背光模組簡介．．．．．．．．．．．．．．．．．．． 5
2.2 背光源分析比較．．．．．．．．．．．．．．．．．． 10
2.3 發光二極體光源特性分析介紹．．．．．．．．．．．． 12
第三章 發光二極體驅動調光電路之分析比較
3.1 線性電流驅動調光電路．．．．．．．．．．．．．．． 18
3.2 定電流脈波寬度調變驅動調光電路．．．．．．．．．． 21
第四章 發光二極體驅動電路之研製
4.1 三級式架構介紹．．．．．．．．．．．．．．．．．． 29
4.2 昇壓式邊界型功因修正電路．．．．．．．．．．．．． 30
4.3 主動箝位順向式轉換器．．．．．．．．．．．．．．． 35
4.4 電流控制降壓式轉換器．．．．．．．．．．．．．．． 40
第五章 紅、綠、藍發光二極體發光特性實驗結果分析
5.1 發光二極體光輸出特性實驗結果．．．．．．．．．．． 49
5.2 實驗結果分析．．．．．．．．．．．．．．．．．．． 60
第六章 結論及未來研究方向
6.1 結論．．．．．．．．．．．．．．．．．．．．．．． 65
6.2 未來研究方向．．．．．．．．．．．．．．．．．．． 66
參考文獻．．．．．．．．．．．．．．．．．．．．．．．．． 68

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