Graphene has been considered as promising material for next generation transparent electrodes due to its excellent optical, electrical, and mechanical properties, but unfortunately the practical use of graphene in end-product devices has not been demonstrated since the yield, size and uniformity problems are yet to be solved to satisfy industrial standards. Here we show large-area monolayer graphene films by precursor-gas preheating thermal chemical vapor deposition (PT-CVD), which enabled mass-produced and larger production of graphene film over 300 mm×300 mm PET substrate area with an optical transmittance of over 95% and a sheet resistance of (146±15) Ω/sq. The uniformity, transmittance and sheet resistance properties of graphene had been characterized by using scanning electron microscope (SEM), Raman spectroscopy, UV-Vis spectrophotometer and four point probe resistivity tester. Finally, we successfully patterned graphene micro/nano-structure and solved vacuum lamination problems for graphene-based truly multi-touch capacitive touch panels in mobile phones. ©, 2015, Journal of Functional Materials. All right reserved.