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博碩士論文 etd-0707108-155910 詳細資訊
Title page for etd-0707108-155910
論文名稱
Title
利用電壓回授做臨界電壓偏移補償之有機發光二極體畫素驅動器
An OLED Pixel Driver Using Voltage Feedback for Threshold Voltage Shift Compensation
系所名稱
Department
畢業學年期
Year, semester
語文別
Language
學位類別
Degree
頁數
Number of pages
89
研究生
Author
指導教授
Advisor
召集委員
Convenor
口試委員
Advisory Committee
口試日期
Date of Exam
2008-06-13
繳交日期
Date of Submission
2008-07-07
關鍵字
Keywords
畫素驅動器、負回授、向上型結構、有機發光二極體
Feedback, OLED, Top Emission
統計
Statistics
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中文摘要
本論文提出兩個新的有機發光二極體的畫素驅動器電路,第一個是5T1C和兩個控制信號的架構,來補償薄膜電晶體臨界電壓的變異且不會受到電源電壓變動,而導致電流不均勻,證明此電路對於臨界電壓的變異具有高免疫力。電路中使用較低電源電壓比較傳統5T1C畫素驅動電路,所以是一個低功率的驅動器,第二個是利用電壓負回授的方式透過電路所設計的增益大小,將驅動電晶體的臨界電壓偏移作補償,達到流進驅動電晶體的電流與電晶體本身的臨界電壓無關,而使得發光二極體每次發出的亮度能維持均勻的亮度。由於此提出的電路架構具有較低電源電壓,以及較低select pulse的電壓,在開關切換過程所產生的突波現象可以被改善消除,且由於電路中降低了電源電壓,所以消耗功率大幅降低,電容充電時可以小於70μs。
本論文所設計的兩個畫素驅動器都採用台灣積體路製造公司(TSMC) 0.35μm 2P4M CMOS 製程來實現。所提供電源電壓為3.3V,其中5T1C電路的佈局面積1031.8 × 1083.7μm2晶片量測結果,在輸入電源電壓10V,select pulse1電壓0~10V, select pulse2 0~8V,Vdata資料電壓範圍0~5V所對應OLED電流大小從0~20.6μA,功率消耗為17μw 。而電壓負回授電路的佈局面積1083.38 × 1149.8μm2,晶片量測結果,在輸入電源電壓10V,select pulse電壓0~10V,回授電阻RF為50歐姆,功率消耗為72μw,充電時間為51.7μs。
Abstract
In this thesis we proposed two new pixel circuits for organic light emission display. The first one is 5T1C circuit with two control signals. It can compensate threshold voltage variation and the drop of the power supply voltage that result in OLED current non-uniformity. We have demonstrates that the pixel circuit has high immunity to the threshold voltage variation. In addition, the circuit uses low supply voltage compared with the conventional 5T1C pixel circuit, so it is a low power driver circuit. The second one employs the voltage feedback method and uses the gain value of design circuit for compensating the threshold voltage shift of the driving TFT.To the aim is to reach that to the flow through current of the driving TFT have no relationship with the threshold voltage of TFT. Thus, the OLED can emission light with retaining uniformity light in each time. Because the proposed circuit configuration has low supply voltage and low select pulse voltage, the spike wave phenomenon can be improved and eliminated while the circuit switchs on and off. Due to the circuit supply voltage is decreased, it power consumption reduce significantly and the capacitor charging time is less than 70 μs. Thus, in this thesis, the two proposed pixel circuits are both of low voltage and low power.
The two pixel circuits designed have been fabricated by TSMC 0.35μm 2P4M CMOS technology with 3.3v power supply. The 5TIC chip area is 1031.8 × 1083.7μm2 and the measured result shows that when the select pulse is 0~10V, the input voltage is 10V, the select pulse2 is 0~8V and the Vdata voltage range is 0~5V, the OLED current is correspond to 0~20.6μA and the maximum power consumption is 17μw. The chip area of the voltage feedback circuit is 1083.38 × 1149.8μm2 and the measured result shows that when the select pulse is 0~10V, the input voltage is 10V and the feedback resistor is 50Ω, the power consumption is 72μw and the charging time is 51.7μs.
目次 Table of Contents
目錄
第一章 有機發光二極體顯示器簡介 1
1.1背景 1
1.2 研究動機 2
1-3 研究發展 5
第二章 有機發光二極體發光結構與畫素電路驅動方法 7
2.1 簡介 7
2.2 驅動電路的種類 8
2.2.1電壓式驅動電路 8
2.2.2電流式驅動電路 9
2.2.3數位式驅動電路 10
2.3 各式典型電壓型式畫素驅動電路的介紹及工作原理 11
2.3.1 傳統2T1C畫素電路的工作原理 11
2.3.2 韓國Seoul Nation University 4T1C畫素電路的工作原理 14
2.3.3 6T1C畫素電路 16
2.4 傳統典型電流型式畫素驅動電路的介紹及工作原理 18
2.4.1 4T1C電流複製(Current Copy)驅動方式 19
2.4.2 4T2C電流複製(Current Copy)驅動方式 21
2.4.3 4T1C電流鏡(Current Mirror)驅動方式 24
2.5 各種傳統畫素電路優缺的比較 27
第三章 新型畫素驅動電路 28
3.1 簡介 28
3.2 新型電壓式畫素電路 28
3.2.1 新型電壓式(5TIC)畫素電路的工作原理 28
3.2.2 模擬結果 31
3.2.3 量測結果 36
3.2.4 量測討論 45
3.3 利用電壓負回授做臨界電壓偏移補償之有機發光二極體畫素驅動器 47
3.3.1 電壓負回授補償臨界電壓偏移畫素電路的工作原理 47
3.3.2 模擬結果 51
3.3.3 模擬結果討論 60
3.3.4 量測結果 65
3.3.5 量測討論 69
第四章 結論及未來展望 70
4.1 結論 70
4.2 未來展望 70
Reference 71
附錄A. 電路Layout圖 75
A.1. 5T1C畫素驅動電路 75
A.2.利用電壓回授做臨界電壓偏移補償之有機發光二極體畫素驅動器 76
附錄B.投稿的會議論文 77
參考文獻 References
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