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Proceedings Paper

a-Si:H pixel electrode circuits for AM-OLEDs
Author(s): Jerzy Kanicki; Yi He; Reiji Hattori
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Paper Abstract

A new pixel electrode circuit based on hydrogenated amorphous silicon technology has been designed, fabricated and characterized for the active-matrix organic light- emitting displays. This circuit has four thin-film- transistors (TFTs) and only two external terminals. In addition, a current driver is used to provide the signals to the data line and automatically adjust the current level to compensate for the threshold voltage shifts of both the organic light-emitting devices and the drive TFT. Consequently, this pixel electrode circuit has an excellent electrical reliability even when a large threshold voltage shift is present. Experimental results indicate that a continuous pixel electrode excitation can be achieved with these circuits. Even after a long time circuit aging stress, this circuit only shows an output current level variation less than 1 percent at the high current level and less than 5 percent at the low current levels. Two additional pixel electrode circuits have also been proposed. These new circuits can achieve a higher output current level and a better output-input current linearity without sacrificing the circuit's electrical reliability. All these circuits can potentially be used for the active-matrix organic light- emitting displays.

Paper Details

Date Published: 30 April 2001
PDF: 12 pages
Proc. SPIE 4295, Flat Panel Display Technology and Display Metrology II, (30 April 2001); doi: 10.1117/12.424869
Show Author Affiliations
Jerzy Kanicki, Univ. of Michigan (United States)
Yi He, Univ. of Michigan (United States)
Reiji Hattori, Univ. of Michigan (United States)


Published in SPIE Proceedings Vol. 4295:
Flat Panel Display Technology and Display Metrology II
Edward F. Kelley; Edward F. Kelley; Apostolos T. Voutsas, Editor(s)

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