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The surface energy controlled ink-jet printing with ultraviolet (UV) irradiation on a novel polyimide film was developed for high-resolution electrode patterning. Minimum linewidth of electrode was 15 µm and minimum space between two electrodes was 2 µm respectively. 160 ppi and 200 ppi all-printed organic thin film transistor (OTFT) backplanes were fabricated by the surface energy controlled ink-jet printing for electrodes, conventional ink-jet printing for organic semiconductor (OSC) and several printing methods on plastic substrate. We have also fabricated a 300 ppi all-printed OTFT array on plastic substrate. Flexible electrophoretic displays (EPDs) driven by 200 ppi all-printed OTFT backplanes were also successfully demonstrated.

The surface contact angles of poly(fluoroalkyl acrylate)s and poly(fluoroalkyl methacrylate)s vary with the cooling mode used after heat treatments. Grazing angle X-ray reflectivity measurement was applied to characterize the surface roughness of polyacrylate thin films on silicon wafers. Surface and interface roughnesses of polyacrylate thin films with large contact angles were measured as 0.7–1.2 nm, which are smaller than roughnesses (1.2–1.8 nm) with small contact angles. It was found that the ordering of side chains in polyacrylate thin films causes the surface to change the contact angles.

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