With the noble method of making the hydrophilic surface of polymer substrate before vacuum roll to roll process, the flexible audible display (FAD) device was studied. Our vacuum coated indium tin oxides (ITOs) electrodes on flexible polymer substrate, polyvinylidene difluoride (PVDF) showed the amorphous crystalline property and very robust mechanical properties. On the strongly textured polymer substrate of PVDF, the amorphous crystalline state was carefully characterized through XRD and TEM analysis. For the mechanical strength and the corresponding electrical property change analysis, we used the bending test with electrical property measurement. Our ITO layers showed the very little electrical conductance changes within a few percent after the bending condition over the several hundred times, of which test condition is asked by many industrial needs. Compared to the conventional other plasma or chemical treatment, ion beam irradiation technique is known to make an effective functional group near the targeted surface without any “damages or degradation” during the process. Without any degradation or chemical damages on the interface of ITOs and PVDF, the fully-dry process with laser ablation was considered to make the pattern for the device fabrication of OLED and film speaker. The FAD device after the process, showed two functions independently: light-emitting and sound generation. Especially, our film speaker device with the robust ITO layers on both sides of piezoelectric polymer worked at bended condition, which showed the adhesion enhanced effect of ITO/PVDF system. In the range of audible frequencies, FAD also showed the independent working performances as expected by our schematics of “two devices on one skin (flexible polymer substrate)”. From these results, the use of ion beam treatment for surface modification and the concepts of combinational flexible electronic device system with functional polymer substrate by dry process could be suggested.

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