臺灣博碩士論文加值系統

本論文提出驅動RGB LED的整合式電源用於LCD背光源取代以往的CCFL。以反馳式三組繞組改善傳統的三組直流對直流轉換器，提升轉換效率以及降低成本。串並聯的LED由多組定電流電路控制，調整PWM訊號可達亮度調整的效果，使色彩明暗變化更細緻。依據本論文所提出的操作原理、分析及設計，製作40W，Vin=85~265VAC，操作頻率在65KHZ的實體電路來驗證所提出轉換器的性能。

A RGB LED backlight driven by a integrated converter is proposed in the thesis instead of CCFL as a Lcd backlight. A flyback converter with three windings takes place of conventional three DC/DC converter so as to improve the efficiency and to decrease the cost. Series-parallel LEDs is controlled by several constant-current circuits and the brightness modulation can be much find and smooth by adjusting PWM signal. The operation principle, analysis and design of the converter more detail. Experimental results show a prototype for Vin=85~265VAC, 40W, operating at switching frequency of 65KHz to verify the performance of the proposed converter.

中文摘要 ---------------------------------------------------------------------------------------- i
英文摘要 --------------------------------------------------------------------------------------- ii
誌謝 ---------------------------------------------------------------------------------------------- iii
目錄 ---------------------------------------------------------------------------------------------- iv
表目錄 ------------------------------------------------------------------------------------------ vii
圖目錄 ------------------------------------------------------------------------------------------viii
符號說明 ----------------------------------------------------------------------------------------x
第一章 導論 --------------------------------------------------------------------------------------1
1-1簡介 ------------------------------------------------------------------------------------1
1-2研究大綱 ------------------------------------------------------------------------------1
1-3論文大綱 ------------------------------------------------------------------------------1
第二章 液晶顯示器介紹 -----------------------------------------------------------------------2
2-1液晶顯示器簡介 --------------------------------------------------------------------2
2-2液晶顯示器種類 --------------------------------------------------------------------2
2-3液晶顯示器工作原理 --------------------------------------------------------------5
2-4彩色顯示技術 -----------------------------------------------------------------------6
2-5背光模組 -----------------------------------------------------------------------------8
2-6冷陰極管 --------------------------------------------------------------------------- 10
第三章 半導體光源 ---------------------------------------------------------------------------11
3-1 LED發光原理 --------------------------------------------------------------------11
3-2 LED製程技術 --------------------------------------------------------------------11
3-3 LED照明術語 --------------------------------------------------------------------13
3-4 LED色彩原理 --------------------------------------------------------------------15
3-5 LED特性 --------------------------------------------------------------------------17
3-6 RGB LED背光模組 -------------------------------------------------------------22
3-7 RGB LED色彩管理系統 -------------------------------------------------------23
第四章 AC/DC整合式RGB LED背光模組驅動電源 -----------------------------------24
4-1切換式電源轉換器 --------------------------------------------------------------24
4-2轉換器工作模式 -----------------------------------------------------------------25


4-3返馳式轉換器 --------------------------------------------------------------------26
4-4高頻變壓器 -----------------------------------------------------------------------33
4-5轉換器設計 -----------------------------------------------------------------------35
4-6 RGB LED液晶螢幕電源轉換器規劃 ----------------------------------------50
4-7 AC/DC轉換器設計參數 --------------------------------------------------------53
4-8 LED定電流電路 -----------------------------------------------------------------57
4-9電路實驗結果 --------------------------------------------------------------------60
第五章 結論與未來趨勢 --------------------------------------------------------------------70
參考文獻 ---------------------------------------------------------------------------------------71

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