ISSN : 1796-203X
Volume : 3    Issue : 3    Date : March 2008

Design of Organic TFT Pixel Electrode Circuit for Active-Matrix OLED Displays
Aram Shin, Sang Jun Hwang, Seung Woo Yu, and Man Young Sung
Page(s): 1-5
Full Text:
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A new current-programming pixel circuit for active-matrix organic light-emitting diode (AM-OLED)
displays, composed of four organic thin-film transistors (OTFTs) and one capacitor, has been
designed, simulated and evaluated. The most critical issue in realizing AMOLED displays with
OTFTs is the variation and aging of the driving-TFTs and degradation of OLEDs. This can cause
image sticking or degradation of image quality. These problems require compensation methods for
high-quality display applications, and pixel level approach is considered to be one of the most
important factors for improving display image quality. Our design shows that the current OLED and
OTFT technology can be implemented for AMOLED displays, compensating the degradation of
OTFT device characteristics.

Index Terms
active-matrix organic light-emitting diode (AM-OLED), organic thin-film transistor (OTFT), pixel circuit,
current-programming, SPICE, simulation analysis.