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Driving schemes for a-Si and LTPS AMOLED displays

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3 Author(s)
Nathan, A. ; Dept. of Electr. & Comput. Eng., Univ. of Waterloo Waterloo, Ont., Canada ; Chaji, G.Reza ; Ashtiani, S.J.

Design of stable active matrix organic light-emitting diode (AMOLED) displays comes with significant challenges that stem from the electrical property of the backplane materials, line parasitics in the matrix, and the opto-electronic property of the organic light-emitting diode (OLED). This paper reviews voltage and current programming schemes for AMOLEDs. Following a systematic review of pixel circuits, design considerations are examined for both current and voltage schemes with focus on stability and programming speed for both amorphous silicon (a-Si) and low temperature polysilicon (LTPS) pixel circuits. In particular, spatial parameter variations and stability, which hinder reliable operation of AMOLED display backplanes, are discussed. Analysis shows that while driving schemes reported hitherto maybe suitable for small and medium size displays, new schemes are critically needed for large-area high-resolution AMOLED displays.

Published in:

Display Technology, Journal of  (Volume:1 ,  Issue: 2 )

Date of Publication:

Dec. 2005

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