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The Fabrication of OTFT-OLED Array Using Ag-paste for Source and Drain Electrode  

Ryu, Gi-Seong (Dept. of Electronic Eng., Media Device Lab., Dong-A University)
Kim, Young-Bae (Media Device Lab, Dong-A University)
Song, Chung-Kun (Dept. of Electronic Eng., Dong-A University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SD / v.45, no.5, 2008 , pp. 12-18 More about this Journal
Abstract
Ag paste was employed for source and drain electrode of OTFTs and for the data metal lines of OTFT-OLED array on PC(polycarbonate) substrate. We tested two kinds of Ag-pastes such as pastes for 325 mesh and 500 mesh screen mask to examine the pattern ability and electrical performance for OTFTs. The minimum feature size was 60 ${\mu}m$ for 325 mesh screen mask and 40 ${\mu}m$ for 500 mesh screen mask. The conductivity was 60 $m{\Omega}/\square$ for 325 mesh and 133.1 $m{\Omega}/\square$ for 500 mesh. For the OTFT performance the mobility was 0.35 $cm^2/V{\cdot}sec$ and 0.12 $cm^2/V{\cdot}sec$, threshold voltage was -4.7 V and 0.9 V, respectively, and on/off current ratio was ${\sim}10^5$, for both screen masks. We applied the 500 mash Ag paste to OTFT-OLED array because of its good patterning property. The pixel was composed of two OTFTs and one capacitor and one OLED in the area of $2mm{\times}2mm$. The panel successfully worked in active mode operation even though there were a few bad pixels.
Keywords
OTFT; AMOLED; flexible display; Ag-paste;
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