21 September 2007 Organic thin-film transistor arrays for active-matrix organic light emitting diode
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We developed an active matrix organic light-emitting diodes (AMOLEDs) on a glass using two organic thin-film transistors (OTFTs) and a capacitor in a pixel. OTFTs switching-arrays with 64 scan lines and 64 (RGB) data lines were designed and fabricated to drive OLED arrays. In this study, OTFT devices have bottom contact structures with an ink-jet printed polymer semiconductor and an organic insulator as a gate dielectric. The width and length of the switching OTFT is 500μm and 10μm, respectively and the driving OTFT has 900μm channel width with the same channel length. The characteristics of the OTFTs were examined using test cells around display area. On/off ratio, mobility, on-current of switching OTFT and on-current of driving OTFT were 106, 0.1 cm2/V-sec, order of 8μA and over 70 μA respectively. These properties were enough to drive the AMOLEDs over 60 Hz frame rate. AMOLEDs composed of the OTFT switching arrays and OLEDs made by deposition of small molecule materials were fabricated and driven to make moving images, successfully.
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Sangyoon Lee, Hyunsik Moon, Do-Hwan Kim, Bon-Won Koo, Eun-Jeong Jeong, Bang-Lin Lee, Joo-Young Kim, Eunkyung Lee, Kook-Min Hahn, Jeong-Seok Han, Jung-Il Park, Jong-Baek Seon, Jung-Woo Kim, Young-Tea Chun, Sangyeol Kim, Sung-Kee Kang, "Organic thin-film transistor arrays for active-matrix organic light emitting diode", Proc. SPIE 6658, Organic Field-Effect Transistors VI, 665803 (21 September 2007); doi: 10.1117/12.737008; https://doi.org/10.1117/12.737008

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