DocumentCode :
1203834
Title :
Does TFT mobility impact pixel size in AMOLED backplanes?
Author :
Kumar, Anil ; Nathan, Arokia ; Jabbour, Ghassan E.
Author_Institution :
Dept. of Electr. & Comput. Eng., Univ. of Waterloo, Ont., Canada
Volume :
52
Issue :
11
fYear :
2005
Firstpage :
2386
Lastpage :
2394
Abstract :
Recent advances in organic light emitting diode (OLED) device efficiencies are making the amorphous silicon (a-Si) backplane a viable solution for a large range of display sizes. This paper presents the possibilities and design challenges of a-Si active-matrix organic light-emitting-diode (AMOLED) backplanes for applications ranging from small full color cell phone displays to HDTV screens. An analytical model for the minimum pixel-area, and hence the maximum resolution for both bottom and top emitting AMOLED architectures is presented in terms of the a-Si thin-film transistor (TFT) device parameters, the process design-rules, and the pixel circuit parameters. It is established that the lower device mobility of a-Si TFTs is no longer the limiting factor. For instance, in a 20´´ W/SXGA panel with full color red-green-blue subpixels, the state-of-the-art TFT processes yield a square pixel size of ∼266 μm. Further, quantitative analysis of charge-injection/charge-feedthrough error in the pixel, and the maximum allowable leakage current for the TFT is also presented.
Keywords :
LED displays; amorphous semiconductors; carrier mobility; charge injection; optical backplanes; organic light emitting diodes; silicon; thin film transistors; AMOLED architectures; AMOLED backplanes; Si; active-matrix organic light-emitting-diode backplanes; amorphous silicon backplane; charge-feedthrough error; charge-injection error; device mobility; organic light emitting diodes; pixel circuit parameters; thin-film transistors; Active matrix organic light emitting diodes; Active matrix technology; Amorphous silicon; Backplanes; Cellular phones; Flat panel displays; HDTV; Large screen displays; Organic light emitting diodes; Thin film transistors; Active-matrix organic light-emitting diode (AMOLED) displays; amorphous silicon (a-Si); thin-film transistor (TFT);
fLanguage :
English
Journal_Title :
Electron Devices, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9383
Type :
jour
DOI :
10.1109/TED.2005.857937
Filename :
1522674
Link To Document :
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