本文主要針對紅、綠、藍三原色發光二極體(Light Emitting Diode, LED)之操作特性進行探討。將LED以直流、脈波與弦波三種不同電流波形驅動，同時進行調光，分析其電氣與發光特性，包括：發光效率、光譜能量分佈以及色度對色飽和度之影響。
經本文分析，LED之操作特性受驅動電流波形影響而有所差異。脈波電流驅動LED，並以脈波寬度調變(pulse-width-modulation, PWM)調光產生的色彩偏移較利用振幅調變(amplitude-modulation, AM)調光之直流與弦波驅動少。但於低調光準位時，脈波驅動產生之色彩偏移仍對色飽和度產生影響，此現象是不可接受的。對此，本文提出以PWM搭配脈波振幅調變(pulse-amplitude-modulation, PAM)之調光控制策略，藉以修正色彩之偏移，確保色飽和度不受調光影響。

This thesis seeks to gain a better understanding on operating characteristics of the three primary color light emitting diode (LED). By applying direct, pulse and sinusoidal currents with dimming function on red, green, and blue LEDs, respectively, the operating characteristics are investigated, including electrical characteristics and their effects on the light efficiency, spectral power distribution, chromaticity on each color LED and the resultant color gamut.
The analysis reveals that the illumination characteristics intimately relate to the driving current. LEDs that are driven by pulse currents with pulse-width-modulation (PWM) dimming have less color shift than those driven by direct and sinusoidal currents with amplitude modulation dimming. However, the problematic color shifting is not acceptable when LEDs with pulse current are dimmed at a lower level. Based on the investigation results, a dimming scheme with PWM and pulse- amplitude-modulation (PAM) is proposed to correct the chromaticity and hence to improve the color gamut.

中文摘要 I
英文摘要 II
目錄 III
圖目錄 V
表目錄 VIII
第一章 簡介 1
　　1-1 發光二極體概述 1
　　1-2 研究動機 1
　　1-3 論文大綱 4
第二章 白光LED技術與基礎色彩工程 5
　　2-1 LED產生白光方式 5
2-2 基礎色彩工程 7
2-2-1 觀測者配色函數 7
2-2-2 CIE表色系統 8
2-2-3 色飽和度 11
第三章 實驗量測系統與LED測試電路 12
3-1 實驗量測系統 12
3-2 LED驅動電路 14
3-3 實驗測試電路 17
第四章 驅動電流波形對LED電特性之影響 19
4-1 LED之電特性 19
4-1-1 LED規格 19
4-1-2 LED特性曲線與等效電阻 19
4-2 頻率對發光效率之影響 27
4-3 驅動電流對發光效率之影響 30
4-3-1 紅光LED 30
4-3-2 綠光LED 31
4-3-3 藍光LED 33
第五章 驅動電流波形對LED光特性之影響 34
5-1 驅動電流波形對光譜能量分佈之影響 34
5-1-1 紅光LED 34
5-1-2 綠光LED 38
5-1-3 藍光LED 42
5-2 驅動電流波形對色彩表現之影響 45
5-2-1 紅光LED 45
5-2-2 綠光LED 51
5-2-3 藍光LED 57
5-3 調光之色彩修正策略 63
第六章 結論與未來研究方向 70
參考文獻 72

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