主動式有機發光二極體(AMOLED)由於其優異的特性，近年來受到市場上相當的矚目，像是廣視角、快的反應速度、高對比、高色彩飽和度、和自發光性等等。而在驅動主動式有機發光二極體顯示器之畫素電路部分，低溫複晶矽薄膜電晶體(LTPS-TFT)扮演著一個重要的角色，由於其優異的電流驅動能力，可以使得畫素電路尺寸微縮，進而達到較大的開口率，提升顯示器品質。
然而，低溫複晶矽薄膜電晶體製程過程中，在準分子雷射退火時會造成的電性差異，會使得在相同灰階情況下卻出現電流不一的情況，進而造成顯示器亮度之不均勻，所以開始出現許多補償電路之研究，而近年來此問題也被有效改善。因此，在本篇論文中，我們希望讓補償電路不只補償薄膜電晶體的不均勻性，同時可以具有補償有機發光二極體的亮度衰減及增加三維度(3D)顯示功能。
鑒於以上動機，我們提出了兩個新型補償畫素電路，同時搭載了高品質的同步顯示(Simultaneous emission)3D驅動時脈，這兩個電路分別為4T2C及5T2C，皆經由AIM-SPICE模擬驗證並修改相關參數得到預期之結果。
在4T2C畫素電路中，首先其高頻三維度驅動操作之特性已經由模擬軟體驗證。其平均電流錯誤率在驅動元件臨界電壓偏移±.0.33之情況下為0.376%，及在有機發光二極體及驅動元件臨界電壓同時偏移之最糟情況下為2.97%。還有在由寄生電阻造成的電源電壓下降狀況下，畫素電路也依然能維持穩定的電流供應。由以上敘述顯示，此新型成功的在三維度驅動操作下有效維持畫面均勻度。
在第二個5T2C畫素電路中，我們考慮了有機發光二極體經長時間操作後亮度會衰減的現象去設計補償電路。利用有機發光二極體臨界電壓隨操作時間上升之特性回授補償電流，得已維持亮度。在驅動元件臨界電壓偏移±.0.33之情況下之電流誤差率僅0.967%。在考慮資料線及掃描線之電阻及電容造成的延遲效應，以一個二十八吋面板為假設，分析顯示器四個角落之電流誤差，模擬結果顯示電流誤差率小於0.7%。
由以上結果顯示，在高速驅動時脈下，補償驅動元件及有機發光二極體的能力有如我們所預期。因此，我們相信在此論文所發表的兩個新型畫素電路是有著相當不錯的穩定電流驅動能力且也是相當適合於應用在大尺寸和高解析度的三維度主動式有激發光二極體顯示器面板中。

Recently, active matrix organic light-emitting diode (AMOLED) has attracted a much attention due to its extraordinary properties, such as wide viewing angle, fast response time, high contrast ratio, high color saturation and self-emissive ability. In the driving pixel circuit for AMOLED, low-temperature polycrystalline-silicon thin-film transistors (LTPS-TFTs) plays an important part due to its high current driving capability. Since this high current driving capability, the pixel circuit size can be minimized to reach higher display quality.
However, the various characteristic of LTPS-TFTs due to the excimer laser annealing process, which will further cause the non-uniform driving current under same gray-scale. Hence, many pixel circuit researches are proposed and this issue is effectively ameliorated. Thus, in this thesis, we want to design novel pixel circuits that not only compensate the non-uniformity of TFTs but also the OLED luminance degradation issue, and the stereo 3D effect is also applied in the circuits. Base on above reason, we proposed two compensating pixel circuits with high quality 3D simultaneously emission (SE) driving scheme, 4T2C and 5T2C respectively. Through the parameter modulation, these two circuits achieved the performances what we expected and verified by AIM-SPICE.
In the 4T2C pixel circuit, first the high speed 3D driving is verified by simulator. The current error rate under various threshold voltage of TFT(ΔVTH = ±0.33 V) is 0.376%. In a worst case of both various threshold voltage of OLED and TFTs, current error rate is only 2.97%. In power line I-R drop which was caused by intrinsic resistance, the proposed pixel circuit still offers a stable current. Consequently, this proposed 4T2C pixel circuit maintains the image uniformity effectively under high speed 3D driving.
In the 4T2C pixel circuit, OLED luminance degradation in long-term operation is in consideration. So we utilized the property that the threshold voltage of OLED will increases with operation time, to design a feedback structure. Due to this structure, the OLED current will increases with the threshold voltage of OLED. The current error rate of this pixel circuit under various threshold voltage of TFT(ΔVTH = ±0.33 V) is 0.967%. Furthermore, we simulated an assumed 32 inch display with all resistance and capacitance of signal lines. Simulation results demonstrate that the current error rate of four corners of display is less than 0.7%.
Due to the above simulation results, under high speed driving, the capability of compensation is achieved as what we expected. Hence, we believed these two proposed pixel circuits have excellent current driving capability and it is suitable in large size and high resolution AMOLED displays.

References

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Chapter 3
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Chapter 4
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Chapter 5
[5.1] W.J. Wu, L. Zhou, R, H, Yao, and J, B, Peng, “A New Voltage-Programmed Pixel Circuit for Enhancing the Uniformity of AMOLED Displays ,” IEEE Electron Device Lett., vol. 32, no. 7, pp. 931–933, July. 2011
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