本文旨在採用動態掃描之LED背光驅動電路來降低背光源之功率損耗。將LCD面板分成6區控制，每一區以8顆RGB LED作為背光源。
為了降低功率損耗以及穩定性的考慮，文中使用返馳式轉換器做為電源供應器，搭配控制器IC(UC3843)，以電流迴授模式的脈波寬度調變方式得到穩定輸出電壓。控制部分使用數位邏輯電路和延遲電路結合電腦影像端子D-SUB的水平、垂直同步訊號，應用數位邏輯之觀念，設計出計數器電路，具有將LED分區點亮、畫面輪流顯示的功能。
實驗結果顯示，倘若LED全亮的耗電量為100%時，分區點亮的耗電量為16.52%。

The purpose of thesis is to design a dynamic scanning LED backlight driving circuit to achieve the reduction of power consumption. An LCD panel was divided into six regions and each region had eight RGB LEDs as the backlight was used as an object for the experiments.
Regarding the power supply, a flyback converter, which can provide a constant output voltage by using the fixed frequency current mode pulse width modulation (PWM), is used to achieve the purpose of circuit stability and power saving.The controlling part, which is the brain of lighting the regional LED in turn, is basically a counter circuit that consists of digital logic circuit, mono-stable circuit and the synchronous horizontal and vertical signal of D-sub.
The experimental results show that power consumption could be reduced drastically from 100% of the full lighting to 16.52% of the regional lighting.

中文摘要 I
英文摘要 II
誌謝 III
目錄 IV
圖目錄 VIII
表目錄 XIII
第一章 緒論 1
1-1 研究背景與目的 1
1-2 研究方法 3
1-3 論文大綱 4
第二章 動態掃描與分區點亮顯示技術 5
2-1 液晶顯示器 5
2-2 LED背光源 7
2-2-1 LED背光技術的優勢 8
2-2-2 LED背光源尚需克服的問題 11
2-2-3 白光LED 12
2-2-4 LED負載特性 14
2-3 掃描與同步 15
2-3-1 交錯掃描與循序掃描 15
2-3-2 D-SUB 18
2-3-3 同步訊號與遮沒訊號 19
2-4 分區點亮控制技術 20
第三章 LED背光驅動電路原理分析 22
3-1 前言 22
3-2 返馳式轉換器之基本工作原理 22
3-3 電流模式脈波寬度調變電路UC3843之功能及操作 23
3-4 同步原理 24
3-5 NE555簡介 25
3-5-1 單穩態多諧振盪器 26
3-5-2 無穩態多諧振盪器 27
3-6 穩流原理 28
3-7 CPLD數位邏輯電路 29
3-7-1 CPLD簡介 29
3-7-2 CPLD的特性 29
3-7-3 CPLD實驗器 30
第四章 動態掃描電路設計與硬體製作 32
4-1 前言 32
4-2 LED背光源同步驅動系統架構 33
4-3 混光控制器的設計 38
4-4 穩流機制 39
4-5 系統電路輸出規格 42
4-6 返馳式轉換器之變壓器設計 43
4-7 UC3843外部電路 46
第五章 模擬與實驗結果 53
5-1 前言 53
5-2 CPLD MAX+plusII模擬電路及分析 53
5-3 同步控制模擬電路 55
5-4 LED分區點亮之模擬波形與計數器之輸出狀態 57
5-5 實驗量測結果 60
5-5-1 動態掃描驅動電路之量測 60
5-5-2 混光電路之量測 66
5-5-3 穩流電路之量測 67
5-5-4 返馳式轉換器電路之量測 69
5-6 功率的量測 71
5-6-1 RGB LED全區點亮的功率量測 72
5-6-2 RGB LED分區點亮的功率量測 75
5-6-3 RGB LED分區點亮與全區點亮的功率消耗比 78
5-7 實作電路照片 78
第六章 結論與未來研究方向 80
6-1 結論 80
6-2 未來研究方向 80
參考文獻 82
自傳 87

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