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Abstract
Amorphous silicon AMOLED displays are almost ready for massproduction and will 加拿大留学生电子科技课程论文be found in all display applications from highresolution cell phone to HDTV. But before commercialization canoccur, the problems of lifetime and image sticking need to beovercome. When it comes to pixel circuit design, there is no onesize-fits-all solution. Several drive schemes and pixel circuits arepresented, each with unique advantages, and each suited for aparticular application. All leverage amorphous siliconmanufacturing infrastructure which leads to the lowest costposition for AMOLEDs on glass.

1. Introduction
Amorphous Silicon (a-Si) shows great promise for launching themass production of Active-Matrix Organic Light-Emitting Diode(AMOLED) displays into a variety of commercial applications.Both researchers and manufacturers have shown that a-Si canprovide sufficient drive current and aperture ratio to enable largesizedAMOLED displays [1] [2]. Others have demonstratedcreative ways in managing a-Si’s well documented instabilityissues. And because of polysilicon’s ongoing yield and costissues, including a current production limitation of Gen 4 only, a-Si is becoming the only backplane option capable of competingagainst TFT-LCD. Moreover, a-Si remains the sole option forlarge-area AMOLED displays, including the lucrative HDTVmarket. On the other end of the spectrum, a-Si also now finds aplace in the smaller display arena, where polysilicon has been thetraditional technology of choice. Contrary to popular belief,smaller displays using a-Si give comparable aperture ratios totheir polysilicon counterparts [2], even for bottom-emission.,while top-emission architectures allow high (>70%) apertureratios and lower power consumption for even the most demandingmobile applications. Power consumption for a-Si backplanes isstill greater than polysilicon, but continuing advances in OLEDefficiencies help, and today is acceptable for power-hungryconsumer electronics like mobile phones and personal mediaplayers

Amorphous silicon backplanes are manufactured using existing TFT-LCD processes, and OLED materials and processes are mass-production ready. But two serious issues are currently preventing a-Si AMOLEDs from being commercial-ready: lifetime and image-sticking.

Lifetime requirements, defined as the time the display luminancedrops to 50% of its initial value, can vary from 5,000h for a lowcostmobile phone display to 30,000h or more for large-areaHDTV. Due to the bias-stress-induced degradation in both a-SiTFTs and OLEDs, displays based on the traditional 2T1C pixelcircuit cannot easily meet these requirements, if at all. Achievingadequate lifetime has been an area of much focus in the field ofcircuit design during the last few years, resulting in thedevelopment of multi-transistor circuits to overcome thislimitation.

8. References
[1] A. Nathan, S. Alexander, K. Sakariya, P. Servati, S. Tao, D. Striakhilev, A. Kumar, S. Sambandan, S. Jafarabadiashtiani, Y. Vygranenko, C. Church, J. Wzorek, P. Arsenault,“Extreme AMOLED backplanes in a-Si with provenstability”, SID Symposium 2004 Digest, pp. 1508-1511.
[2] A. Nathan, S. Alexander, P. Servati, K. Sakariya, D.Striakhilev, R. Huang, A. Kumar, C. Church, J. Wzorek, P.Arsenault, “AMORPHOUS SILICON ENABLES LARGEAMOLED DISPLAYS FOR HDTV”, SID Symposium2005 Digest.
[3] J.L. Sanford, https://www.51lunwen.本论文由英语论文网提供整理，提供论文代写，英语论文代写，代写论文，代写英语论文，代写留学生论文，代写英文论文，留学生论文代写相关核心关键词搜索。