| 초록 |
For the realization of ubiquitous society, the wireless sensor network and flexible display should be available without concerning the limit of cost and size. Therefore, the fully roll-to-roll (R2R) printed thin film transistors (TFTs) based costless NFC-sensor tags and flexible signage with a large area should be first practically available since the NFC tag with sensor can be used as a protocol to transfer information via smartphone, and flexible signage can take the roles of printing papers and wall papers. As a consequence of developing the costless NFC tag with sensor and the flexible large area signage, I would like to show the way of fabricating the costless NFC tag and TFT-active matrix for operating e-paper using the R2R gravure printing process. As reference examples, fully gravure printed 4 bit NFC tags and 20 x 20 pixels of TFT-active matrix with 10 PPI resolutions to operate e-paper are R2R gravure printed using silver nanoparticle based conducting ink, BaTiO3 nanoparticle based dielectric ink and single walled carbon nanotube based semiconducting ink with poly(ethylenephtalate) (PET) film as a substrate, and their scalability has been studied by optimizing the printing process and the ink formulation to attain 95% of the device yield. Since we are using R2R gravure system including commercially available R2R gravure machine with servomechanism to control the overlay printing registration accuracy of ±20 μm, electronic inks and PET web, this R2R system can be practically employed to manufacture 4 bit NFC tags and 10 PPI levels of TFT-active matrix or any relevant printed TFT based devices. In this presentation, I would like to show the details of R2R gravure system to print 4 bit NFC tag and TFT-active matrix and characterize the electrical properties of consisted R2R printed TFTs in the devices. Furthermore, the fully R2R gravure printed 4-bit NFC tag and e-paper with 10 PPI resolutions will be demonstrated. |
