臺灣博碩士論文加值系統

本論文以交流弦波的方式驅動紅光、綠光及藍光發光二極體，並探討頻率、電流及溫度對發光二極體光電特性的影響。結果發現：(1) 頻率會改變發光二極體的光電特性。(2) 驅動電流值大小會影響發光二極體之主波長與色偏。(3) 溫度增加會造成主波長偏移與發光效率下降。使用弦波振幅調變方式來調光時，會使得RGB LED的色度坐標值改變，造成色偏。本文提出正弦脈波調變的方法，用高頻正弦波和低頻脈波之脈寬來調整發光二極體之光輸出，以改善色偏。

By applying the sine wave to drive the red light, green light, and blue light LEDs, this thesis examines the effectiveness of the frequency, current, and temperature on the optoelectronic characteristics. Results show that: (1) The optoelectronic characteristics of LEDs can be changed by adjusting the frequency. (2) The driving current affects the dominant wavelength and color shift of the LED output. (3) Increasing temperature causes dominant wavelength shifting and luminous efficacy decay. By dimming the LED light output with sine wave amplitude modulation, it changes the chromaticity coordinates of the RGB LEDs, which in turn causes a color shift. Color shifting defects can be overcome by dimming the LEDs with a high frequency sine-wave and low frequency pulse width modulation method.

中文摘要…………………………………………………………………Ⅰ
英文摘要…………………………………………………………………Ⅱ
誌 謝……………………………………………………………………Ⅲ
目 錄……………………………………………………………………Ⅳ
表目錄……………………………………………………………………Ⅸ
圖目錄……………………………………………………………………XI
第一章 緒論………………………………………………………………1
1.1 研究背景…………………………………………………………1
1.2 研究目的與方向…………………………………………………4
1.3 論文大綱…………………………………………………………4
第二章 發光二極體與照明用語介紹……………………………………5
2.1 LED發光原理……………………………………………………5
2.2 LED發光材料與能隙……………………………………………6
2.3 LED結構…………………………………………………………6
2.4 LED發光效率……………………………………………………7
2.5 LED電氣特性……………………………………………………9
2.5.1 LED I-V特性……………………………………………9
2.5.2 LED電容效應……………………………………………11
2.6 LED溫度特性……………………………………………………12
2.6.1 溫度與電壓之關係……………………………………12
2.6.2 溫度與發光效率之關係………………………………13
2.6.3 溫度與主波長之關係…………………………………13
2.7 光度學名詞介紹………………………………………………14
2.7.1 光通量…………………………………………………14
2.7.2 照度……………………………………………………15
2.7.3 發光強度………………………………………………16
2.7.4 輝度……………………………………………………16
2.8 色度學相關知識介紹…………………………………………17
2.8.1 CIE 1931色度座標系統………………………………17
2.8.2 CIE1964/CIE1976色度座標系統………………………19
2.8.3 混光原理及方法………………………………………20
2.8.4 色溫……………………………………………………23
2.8.5 主波長…………………………………………………24
2.8.6 色域……………………………………………………25
2.8.7 色純度…………………………………………………26
2.8.8 演色性…………………………………………………27
第三章 實驗量測系統與LED測試方法…………………………………28
3.1 實驗量測系統…………………………………………………28
3.1.1 光特性測試系統………………………………………29
3.1.2 溫度監控量測系統……………………………………32
3.1.3 電氣特性量測系統……………………………………32
3.1.4 LED驅動系統…………………………………………33
3.2 發光二極體規格………………………………………………33
3.3 發光二極體測試方法…………………………………………35
第四章 雙向LED量測結果分析與混色調光策略………………………36
4.1 頻率與LED發光特性之關係……………………………………36
4.1.1 頻率對光通量的影響…………………………………36
4.1.2 頻率對發光效率的影響………………………………37
4.1.3 頻率對主波長的影響…………………………………39
4.1.4 頻率對色純度的影響…………………………………40
4.1.5 頻率對色偏的影響……………………………………42
4.2 電流與LED發光特性之關係……………………………………43
4.2.1 電流對光通量的影響…………………………………43
4.2.2 電流對發光效率的影響………………………………45
4.2.3 電流對主波長的影響…………………………………47
4.2.4 電流對色純度的影響…………………………………49
4.2.5 電流對色偏的影響……………………………………51
4.3 溫度與LED發光特性之關係……………………………………52
4.3.1 溫度對光通量的影響…………………………………52
4.3.2 溫度對發光效率的影響………………………………53
4.3.3 溫度對主波長的影響…………………………………54
4.3.4 溫度對色純度的影響…………………………………56
4.3.5 溫度對色偏的影響……………………………………57
4.4 漣波對LED發光特性之關係……………………………………58
4.4.1 漣波對光通量的影響…………………………………58
4.4.2 漣波對主波長的影響…………………………………60
4.4.3 漣波對色偏的影響……………………………………62
4.4.4 漣波對白光LED的影響…………………………………62
4.5 RGB雙向LED模組之混色調光策略……………………………64
4.5.1 弦波振幅調變與正弦脈波調變驅動之發光特性比較…65
4.5.1.1 主波長…………………………………………66
4.5.1.2 色偏……………………………………………68
4.5.1.3 光通量…………………………………………71
4.5.2 弦波振幅調變與正弦脈波調變驅動之混色調光比較…72
第五章 結論及未來研究方向…………………………………………76
5.1 結論……………………………………………………………76
5.2 未來研究方向…………………………………………………76
參考文獻…………………………………………………………………78

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