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03월 07일 19시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능
제107회 대한화학회 학술발표회, 총회 및 기기전시회 안내
Flexible OTFT-backplane using Printing Technologies
2011년 3월 3일 13시 57분 46초
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금 14시 : 30분
Advances in Information Display Technology : Materials and Processing
동아대학교 전자공학과, Korea
Flexible display is attracting much attention as an advanced display. Printing processes are essential technology for the flexible display considering their ability for large area deposition of thin films and the inherent low temperature process for plastic substrates and also low cost. In this paper we present the printing technologies for flexible OTFT-backplane. The various priting technologies were applied for each layers of OTFT; screen printing combining with reverse offset for gate electrodes and scan bus lines with Ag ink, spin coating for gate dielectric layer with PVP, inke jet for source/drain electrodes with PEDOT:PSS, ink jet for the semiconductor layer with TIPS-pentacene, and screen printing for pixels electrodes with Ag paste. The gate line width of 30 um was reproducibly achieved with screen printng. Especially the resistivity of 10^-6 ohm-cm was a meaningful result with screen printing. For S/D electrode conductivity of PEDOT:PSS was enhanced by doping with glycerol and was improved to 500 S/cm, which was sufficient enough for S/D electrodes. PEDOT S/D electrodes were patterned by ink jet and the channel length of 10 um was obtained. The contact resistance with pentacene was comparable to that of Au. The dynamics of particle movement in a droplet was analyzed and applied to develope the process conditions to obtain the uniform layer of TIPS-pentacene. We could obtain the mobility of 0.3 cm^2/V.sec with deviation less than 10 %. An interlayer consisting of PVA and Acryl was coated on TIPS-pentacene. The final OTFT-backplane was obtained by screen printing the pixel electrodes with Ag paste. Finally 6 inch size of EPD sheet was laminated on the backplane. The EPD panel successfully demonstrated to display pictures.
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