平面顯示器具有輕、薄、低功耗、廣視角及全彩化之特點，因此在應用上都具有相當大的潛力。在眾多不同種類的平面顯示器中，有機電激發光二極體顯示器因為具備有高亮度、視角廣、體積薄、省電、自發光..等優點，所以將會有大量的焦點集中在有機電激發光二極體顯示器上。
在本論文中，我們探討以低溫多晶矽薄膜電晶體(LTPS-TFTs)以及非晶矽薄膜電晶體(a-Si TFTs)驅動之主動有機發光二極體(AMOLEDs)電壓及電流補償畫素電路。在電壓驅動化速電路方面，相較於非晶矽薄膜電晶體，低溫多晶矽薄膜電晶體(LTPS-TFTs)擁有較好的電流驅動能力及較佳的可靠度，較小的臨界電壓飄移，並且可以用來整合畫素電路及週邊的驅動電路於同一塊玻璃基板上，但是由於LTPS-TFT製程的關係，導致LTPS-TFT產生特性上的差異，因此藉由本篇論文提出了新型的驅動電路來補償臨界電壓的差異、IR-Drop的問題。另一方面，相較於LTPS-TFTs，非晶矽薄膜電晶體(a-Si TFTs)在實際產業界應用上仍具有高良率、製程便利性等等優勢，縱使它有可靠度的問題，但仍廣泛被應用在平面顯示技術上。故本論文提出了一個以LTPS-TFTs為其驅動元件之電壓驅動畫素電路，以及一個以a-TFTs為其驅動元件之電流驅動畫素電路。
首先，在第二章之電壓驅動電路方面，本論文先對傳統畫素驅動電路(2T1C)進行模擬與結果討論，根據模擬結果，傳統驅動電路容易受到不同元件特性的影響，造成傳統畫素驅動電路之電流的不穩定。為了克服傳統驅動電路的不穩定性，因此提出了一個電壓驅動之主動式有機電激發光二極體的3T1C補償電路，並經過兩次改良及修正此3T1C畫素電路，提出一個新式5T1C畫素電路。3T1C驅動電路為原始的設計，結果，有激電機發光二極體在臨界電壓變異0.6 V的平均電流錯誤率為1.41%，對於Power line之IR-Drop達到1V的影響維持在15%以下，但是由於設計的失誤，並無法在主動式面板驅動。經由修改提出之第二個畫素電路為5T1C驅動電路，有激電機發光二極體在臨界電壓變異VTH = ± 0.3 V的平均電流錯誤率為1.67%，對於Power line之IR-Drop 1V的影響仍維持在15%以下，雖然開口率有所下降，但已可以符合主動式面板驅動的要求，但由於已經有類似結構出現在相關期刊當中，故再修改成一個新式5T1C驅動電路，有激電機發光二極體在臨界電壓變異VTH = ± 0.3 V的平均電流錯誤率為1.07%，對於Power line之IR-Drop 1V的影響可以壓低在2%以下，算是相當大的突破。
在第三章之電流驅動電路方面，我們探討了電流複製式驅動電路以及電流鏡式驅動電路，並提出一個新式電流驅動電路，利用Power line 電壓調變來提升電流線性程度，有激電機發光二極體的平均電流錯誤率為2.88%，此數據是在臨界電壓變異 VTH = -1~+4 V下所達到之效果，對於Power line之IR-Drop 3 V的影響可以壓低在3%以下，OLED劣化對於驅動電流的影響也相當小。
總而言之，本論文中所提出的數個畫素驅動電路可有效補償低溫多晶矽薄膜電晶體以及非晶矽薄膜電晶體所造成之元件特性的差異，同時明顯的提升有激電機發光二極體之電流的均勻性，對於未來主動式有機電激發光二極體應用極具潛力。

Organic Light Emitting Diode (OLED) with fast response, high brightness and high contrast plays an important role gradually in the further market of flat penal display (FPD).
In order to enhance the image quality of AMOLEDs further, the different driving methods have been compared and evaluated. Analog driving circuits can be divided into current programming circuits and voltage programming circuits. Current programming circuits can compensate both of the threshold voltage and mobility variation. Moreover, due to amorphous silicon TFTs reliability issue under the gate bias stress, current programming method is more suitable for wide range threshold voltage variation devices because of its self-compensation function. However, they have the limitation of the programming time issue. The data driver IC also needs more complicated design. Voltage programming circuits show great potential for high resolution and low cost applications in the future because of the simple structure.
This thesis demonstrates two pixel circuits using LTPS-TFT TFTs and a-Si TFTs for AMOLED.
In chapter two, we introduced the conventional 2T1C pixel circuit. The experimental results of conventional pixel design (2T1C) demonstrate the influence caused by the threshold voltage variation of LTPS-TFTs and the power line IR voltage drop effect. As a result, the different current flow through OLED would result in the non-uniform brightness across the panel.
At first, conventional 2T1C circuit is simulated and discussed. Simulation results show that conventional 2T1C pixel circuit has high non-uniformity due to the various characteristics of TFTs. The average error rate of the OLED current is up to 37.8 %.
In order to overcome the non-uniformity problem of conventional 2T1C circuit, B. S. Lin proposed a 3T1C voltage programming AMOLED pixel design. But for conventional row-by-row driving, this pixel circuit cannot conform with AM technique. As the above reason, we modified the 3T1C pixel circuit into two 5T1C pixel circuits. The simulation result shows the average error rate of the OLED current is about 1.67 % in the first 5T1C modified pixel circuit. Apparently, the OLED current is independent of the variation of threshold voltage. In addition, the degradation rate of the output current while Vdd drop of 1 V is improved to about 15 %, while it is about 80% or even more in the conventional p-type 2T1C pixel circuit. In order to improve the degradation rate of the first modified 5T1C pixel circuit, the second modified 5T1C pixel circuit is proposed. It shows that the average error rate of the OLED current is only 1.07 % in the second modified 5T1C pixel circuit. Apparently, the OLED current is independent of the variation of threshold voltage. In addition, the degradation rate of the output current while Vdd drop of 1 V is improved to about 2.5 %.
In chapter three, we introduced the current copy type, current mirror type and proposed 5T1C current copy type pixel circuits. We used a variable power line Vdd design in our pixel circuit to control the ΔVD_DTFT and decrease the IOLED deviation caused by capacitance coupling effect and improve the output current linearity. The average IOLED error rate is about 2.88% in a very wide range of threshold voltage variation (VTH = 5 V, -1~+4 V), while it is about 30–40% in the conventional a-Si 2T1C voltage programming pixel in a very small range of threshold voltage variation(VTH = ± 0.3 V). The result shows that because of the n-type DTFT design, the proposed pixel circuit is nearly independent of the I-R voltage (＜3%). The IOLED is independent of OLED degradation because when the anode voltage shift by 0.33V, the IOLED is nearly the same.
Therefore, these proposed pixel circuits can all successfully compensate for the threshold voltage variation of LTPS and a-Si DTFTs and the IR drop on the power lines. So these proposed pixel circuits can improve the current non-uniformity for AMOLED compared with conventional pixel circuit. Therefore, they could be the promising candidates for the AMOLED panel application in the future.

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