Abstract
In this work, we propose a novel active-matrix organic light-emitting
diode displays (AMOLED) pixel circuit based on organic thin-film transistor
(OTFT) architecture, which consisted of four switches, one driving transistor,
and a capacitor. The pentacene-based OTFT device possesses a field-effect
mobility of 0.1 ${\hbox{cm}}^{2}
/{\hbox{V}}\cdot{\hbox{s}}$, a threshold voltage of $-{\hbox{1.5}}~{\hbox{V}}$, subthreshold slope of 1.8 V/decade and an on/off current ratio ${\hbox{10}} ^{6}$.
The resultant voltage-driving pixel circuit, named “Complementary Voltage-Induced
Coupling Driving” (CVICD), is different from the current-driving scheme
and can appropriately operate at low gray level for the low-mobility OTFT
circuitry. The current non-uniformity less than 2.9% is achieved for data
voltage ranging from 1 to 17 V by SPICE simulation work. In addition, the
new external driving method can effectively reduce the complexity of OLED
pixel circuitry.
© 2009 IEEE
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