Abstract
80ppi, 160ppi and 200ppi all-printed organic thin film transistor (OTFT) backplanes were fabricated by a surface energy controlled ink-jet printing and several printing methods on plastic substrate. We developed the surface energy controlled ink-jet printing with ultraviolet (UV) irradiation on a novel polyimide film for high-resolution electrode patterning. Minimum line width was 15μm and minimum space between two electrodes was 2μm respectively. A 200ppi all-printed OTFT backplane with a channel length of 5μm showed high mobility over 0.1cm2/Vs with small-molecule organic semiconductor (OSC). To show the scaling capability, we have also fabricated a 300ppi all-printed OTFT array on plastic substrate. Flexible electrophoretic displays (EPDs) driven by 80ppi, 160ppi and 200ppi all-printed OTFT backplanes were also successfully demonstrated.
