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研究生:洪崇智
研究生(外文):Chung-Chih Hung
論文名稱:RGB LED 背光模組自動混光研究
論文名稱(外文):Auto Mixed Light Research for RGB LED Backlight Module
指導教授:張永農張永農引用關係
學位類別:碩士
校院名稱:國立虎尾科技大學
系所名稱:電機工程研究所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2008
畢業學年度:96
語文別:中文
論文頁數:67
中文關鍵詞:發光二極體背光模組光偵測二極體混光調控模組
外文關鍵詞:LED(Light-Emitting Diode)back-light modulephotodiodemixed-light and adjustment control module
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本文利用紅、綠、藍發光二極體做為背光模組的光源,以三原色發光二極體混色調光方式實現背光模組白光輸出,讓色域範圍更寬廣,達到高色彩飽和度的理想。本文應用功因修正與半橋轉換器技術設計一隔離式電源驅動發光二極體,並透過可程式系統晶片混光調控技術得到節能效果與穩定的白光光源輸出。
本文透過了實驗驗證發光二極體與光偵測二極體會隨溫度而改變其特性,且不同之光偵測二極體對於溫度之特性並不相同。為防止溫度因素造成發光二體特性偏移而使白光輸出產生色差,本文整合可程式系統晶片與光二極體感測元件成一混光控制電路模組,用以監測環境溫度與RGB 光二極體回授之電壓值,透過混光控制電路模組調整其相對應之RGB LED工作週期,得到一穩定之白光輸出。但為修正光偵測二極體會隨溫度改變而造成的誤差,本研究加入溫度感測元件,製作了混光調控校正器,藉此校正溫度修正值。利用混光調控模組回授補償控制及校正器的調校,可使光輸出之CIE1931 xy座標值可與預期目標值吻合。
In this thesis, light emitting diodes with red, green, and blue lights, respectively, are served as the back-light source and employed to generate the three primitive colors that can be adjusted and mixed to realize the output of white light. Attempts to bring out wider range of color space and obtain higher color saturation can, thus, be achieved. With the introduction of a half-bridge converter with power factor correcting function, an isolated-power-driven light-emitting diode is developed. By using the light-mixing and adjustment technique, the power saving and white light stabilizing can be accomplished.
Through the experimental observations and quantitative measurements, the features of light-emitting diodes and photo-detectors are found to be susceptible to temperature. Moreover, different photo-detectors experience different degree of change of features for temperature fluctuation. To prevent the output white light from being experienced with color deviation due to temperature effect on the performance of LED, a mixed-light circuit module is developed, by integrating Programmable System on Chip with photo-diode sensor devices, to examine the ambient temperature and feedback voltage level of RGB photo-diodes. Through the usage of mixed-light control circuit module, the corresponding duty cycle of RGB LED can be adjusted, and the stable white light output can, consequently, be achieved. Furthermore, attempts to correct the error produced by photo-detector diode due to temperature are made by the introduction of a temperature sensor. A so-called “Mixed-light and adjustment control module corrector” was implemented to correct temperature modified value. By mixed-light and adjustment control module and calibrating of the corrector, the CIE1931 xy coordinates of output light are in good agreement with the predicted results.
目錄
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 概述 1
1.2 研究動機 5
1.3 論文大綱 7
第二章 混光理論與三原色發光二極體混光應用 8
2.1 色彩與混光理論 8
2.2 發光二極體混光應用 12
第三章 三原色發光二極體特性實驗分析 16
3.1 發光二極體實驗量測系統設計 16
3.2 發光二極體之規格 19
3.3 發光二極體之特性結果分析 22
第四章 光偵測二極體特性實驗分析 33
4.1 光偵測二極體實驗量測系統設計 33
4.2 光偵測二極體之規格 35
4.3 光偵測二極體之特性結果分析 36
第五章 電源供應模組與發光二極體混光調色驅動控制 41
5.1 電源供應模組 41
5.2 自動混色控制系統 46
第六章 結論與討論 59
參考文獻 61
附錄 CIE 1931 二度角色彩相稱函數 66
簡歷 67
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