[DF] Digital Fabrication

[DF-03] Bridge Pattern Printing for Flexible Transparent Touch Panel Applications

*Kye-Si Kwon¹, Seongjun Kim², Soobin Oh¹, Md. Khalilur Rahman^1,3 (1. Soonchunhyang University, 2. Samsung Electronics Co. Ltd, 3. Comilla University)

Bridge patterning is required to electrically connect driving electrodes on a substrate for capacitive touch panel. In this study, we propose an ultrafine bridge pattern printing via a near-field electro spinning (NFES) technique. For this purpose, Ag metallic ink is mixed with a high molecular weight polymer to produce thin conductive lines on a flexible PET (Polyethylene terephthalate) substrate with transparent diamond shaped ITO (Indium Tin Oxide) electrodes for driving and scanning purpose. By using the proposed method, the printed bridge conductive pattern was about 4 mm in width, which is invisible to naked eyes and the resistance was below 10 Ω/mm by using laser sintering. To sinter printed nano-silver ink, we used green laser to minimize damages of the PET substrate.