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研究生:林家榮
研究生(外文):Galong Lin
論文名稱:TFT液晶顯示器之feed-through效應改善
論文名稱(外文):Improving the feed-through effect for TFT liquid crystal displays
指導教授:劉堂傑
學位類別:碩士
校院名稱:逢甲大學
系所名稱:資訊電機工程碩士在職專班
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:2005
畢業學年度:93
語文別:中文
論文頁數:89
中文關鍵詞:液晶顯示器
外文關鍵詞:TFT LCD Driver
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本論文主要內容為TFT LCD (Thin Film Transistor Liquid Crystal Display )液晶顯示器之feed-through效應研究。目前有許多feed-through效應補償方式,其目的就是使positive與negative波形於液晶是相同rms ( root mean square )電壓,並且改善顯示器閃爍現象。但是液晶電容本身卻會因為不同的電壓而產生不同的電容值CLC,導致只使用定值VCOM偏移的電壓是無法完全補償所的灰階所產生的feed-through電壓 。
因此本論文以CS on Common的TFT LCD為結構設計一驅動電路,利用此電路測量feed-through電壓△VP以及改善補償的驅動方式,此驅動電路改良了灰階電路部份,使各灰階電壓可作細部的微調,針對不同灰階電壓所產生的feed-through電壓△VP作補償。以VCOM 交流的方式驅動,Source可產生16灰階變化,並且色彩可達4096色顯示效果。另外利用光二極體元件測量feed-through 所產生的閃爍現象,最後分別比較未補償與定值VCOM偏移補償以及多重灰階補償的效果差異。
This thesis deals with the feed-through effect in TFT LCDs (Thin Film Transistor Liquid Crystal Displays).Several techniques have been proposed to compensate the difference in the rms (root mean square) voltages in the positive and negative voltages frames for the LCD. The flicker phenomenon during in displaying caused from the feed-through effect can also be improved. However, the capacitance of the LCD cell CLC, depends on the exerted voltage and is not constant for different gray level. A simple fixed offset voltage added in VCOM could not totally compensate the feed-through voltage .

In this thesis, the TFT LCD with CS on Common structure was considered in the design of the driver circuit. The induce feed-through voltage △VP and it’s compensation were analyzed. In this study, it was found the driver circuit improved the portion of fine turning the gamma voltage for each gray level. For each gamma voltage, the corresponding VCOM was alternately polarized in each frame. In this study, there were 16 gray levels for up to 4096 colors for display. By use of a photodiode the feed-through caused flicker was observed and analyzed . The performances with uncompensated and compensate VCOM will be compared.
誌 謝 I
中 文 摘 要 II
ABSTRACT III
目 錄 IV
圖 目 錄 VII
表 目 錄 IX
表 目 錄 IX
第一章 緒 論 1
1.1研究背景 1
1.2 研究動機 2
1.3 論文組織 5
第二章TFT主動液晶顯示器驅動方式介紹 6
2.1液晶的特性 6
2.2 TFT的結構及原理 7
2.3 TFT的驅動波形 12
2.3.1 理想的TFT波形 12
2.3.2實際TFT的波形 13
2.3.3 TFT液晶的反轉方式 14
2.3.4 TFT的VCOM 驅動方式 15
第三章 TFT LCD feed-through效應介紹 17
3.1 feed-through 效應的原理 17
3.2 feed-through效應對TFT顯示器的影響 21
3.3液晶電壓與液晶電容 22
第四章TFT LCD feed-through補償方法 24
4.1 VCOM 偏移電壓的補償方式 24
4.2 Gate三階驅動補償方式 25
4.3 Gate四階驅動方式 28
4.4多重灰階補償方式 33
5.1 TFT LCD數位電路部份 36
5.1.1 Controller電路 36
5.1.2 Shifter電路 37
5.1.3 Latch電路 38
5.2 TFT LCD類比驅動電路部份 39
5.2.1多重灰階補償電路 39
5.2.2 D/A Converter 電路 42
5.2.3 Gate及VCOM 電路 43
5.2.4 Output Buffer 電路 44
第六章 TFT LCD FEED-THROUGH 效應實驗 47
6.1 TFT LCD feed-through實驗目的 47
6.2 TFT LCD feed-through實驗器材 48
6.2.1 TFT LCD面板 48
6.2.2白光LE背光模組 49
6.2.3光二極體TSL253 50
6.3實驗條件及驅動參數 53
6.3.1儀器架設 53
6.3.2驅動參數條件 54
6.4實驗細節 56
6.4.1驅動TFT LCD 顯示16灰階 56
6.4.2測量TFT LCD的閃爍數值 57
6.4.3 16灰階的VCOM最佳補償電壓 64
6.4.4 補償16灰階各階電壓 65
第七章 測試結果與討論 70
第八章 結論 76
第九章 未來展望 77
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