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研究生:楊宗振
研究生(外文):Zong-Zhen Yang
論文名稱:紅綠藍發光二極體背光驅動技術之研究
論文名稱(外文):Study on RGB LED Backlight Driving System
指導教授:劉益華
指導教授(外文):Yi-Hua Liu
口試委員:劉益華
口試日期:2012-07-11
學位類別:博士
校院名稱:國立臺灣科技大學
系所名稱:電機工程系
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:2012
畢業學年度:100
語文別:中文
論文頁數:127
中文關鍵詞:液晶顯示器背光模組紅綠藍發光二極體場色序法顯示技術區域調光LLC諧振轉換器
外文關鍵詞:LCD backlight moduleRGB LEDfield sequential colorlocal dimmingLLC resonant topology
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本論文提出一以數位控制LLC諧振轉換器為基礎之紅綠藍發光二極體背光模組驅動系統。LLC諧振轉換器具有零電壓切換特性,可降低開關元件之切換損失,提高轉換器整體效率。所提出之驅動系統實現了場色序法顯示技術及區域調光控制,並具有動態電壓調整功能。本論文使用單組電源轉換器驅動紅綠藍發光二極體面板,因此驅動系統架構簡單,可降低成本。本系統將紅綠藍發光二極體面板分成四塊區域,可搭配人機介面進行各區之亮度控制。透過數位控制,轉換器可達成變動輸出電壓功能使得串聯在紅綠藍發光二極體上之線性穩流電路消耗功率降低,因此系統效率可進一步提高。所提出之驅動系統具有架構簡單、電源效率佳,畫面對比度高及色域廣等優點。實驗結果顯示,本文提出之系統架構可成功驅動紅綠藍發光二極體背光面板,並透過人機介面完成混色與區域調光控制。
In this dissertation, a digitally-controlled LLC resonant converter for RGB LED backlight driving system is proposed. The LLC resonant topology allows for zero voltage switching (ZVS) of the main switches thereby dramatically lowering switching losses and boosting efficiency. Field color sequential techniques, local dimming control and dynamic bus voltage regulation technologies are then implemented in the proposed system. Using the topology proposed in this dissertation, only one power converter is required to drive the red, green and blue LED strings; therefore the system configuration is very simple. By dividing the backlight into four areas, the backlight brightness of each area can be individually controlled. The output voltage is adjusted by the proposed digital controller so that RGB LED maintains the desired string current. Because the voltage across the linear current regulators in the system is the minimum voltage, the driving system efficiency is maximized. The proposed backlight driving system boasts the advantages of simple circuit structure, improved power efficiency, high contrast ratio and wide color gamut. Finally, experimental results are presented to validate the effectiveness and correctness of the proposed system. According to the experimental results, the presented system can successfully drive the RGB LED backlight module, and the color-mixing, local dimming and bus voltage regulation functions can be achieved.
摘要 I
Abstract III
誌謝 V
目錄 VII
圖目錄 XI
表目錄 XV
第一章 緒論 1
1.1 研究背景與動機 1
1.2 文獻探討 3
1.3 研究目的 6
1.4 論文大綱 7
第二章 LCD背光模組技術簡介 9
2.1 背光模組簡介 9
2.2 背光模組之光學零組件介紹 11
2.3 LED和CCFL 背光源簡介 13
2.3.1 CCFL發光原理 13
2.3.2 LED發光原理 14
2.4 發光二極體種類 15
2.5 LED基本特性 17
2.6 RGB LED與CCFL比較 18
2.7 場色序法顯示技術 21
2.8 區域調光控制技術 23
第三章 RGB LED 驅動電路系統硬體架構 25
3.1 諧振轉換器簡介 26
3.1.1 理想RLC串聯諧振電路頻率響應分析 29
3.1.2 半橋式諧振轉換器簡介 31
3.1.3 半橋式諧振轉換器頻率響應分析 31
3.1.4 LLC諧振轉換器動作分析及數學模型推導 37
3.1.5 LLC諧振轉換器之設計 46
3.2 主動式功率因數修正電路 51
3.2.1 臨界導通模式功率因數修正電路設計 52
3.2.2 電路規格與元件設計 53
3.3 並聯LED穩流電路架構 56
3.3.1 線性穩流電路分析 58
3.3.2 線性穩流電路設計 61
第四章 RGB LED 驅動電路系統韌體架構 62
4.1 dsPIC33FJ16GS502微處理器簡介 63
4.2 變動電壓之LLC諧振轉換器程式控制流程 64
4.3 內部積體電路(I2C) 67
4.4 數位控制型可變電阻IC 70
4.5 數位調光控制核心與LabVIEW人機介面 72
4.5.1 RS-232通訊規格 72
4.5.2 數位調光控制流程圖 73
第五章 實驗波形數據結果 77
5.1 LED面板規格與電源輸出電壓規格 77
5.2 實作電路結果與波形量測 78
第六章 結論與未來研究方向 98
6.1 結論 98
6.2 未來研究方向 99
參考文獻 100
作者簡介 107
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