The ever-increasing development of smart electronics requires powerful energy storage devices, in particular supercapacitors with flexible and transparent properties. Increasing the mass loading of active material promotes the specific capacity (or capacitance) at the expense of transparency and flexibility of the supercapacitor electrodes. Therefore in order to maintain high transmittance, thin films which constitute of pseudocapacitive material and conductive network would be highly desirable. Here we report on a RuO₂/PEDOT hybrid thin film by a simple aerosol-jet spray technique. It was found that RuO₂ loading and electrode thickness have great effects on the transmittance and sheet resistance of the thin film, which could be well explained and fitted via the percolation theory.^1,2 By loading 40 wt.% RuO₂, the hybrid thin film demonstrated a transmittance of 94%, a lowest sheet resistance and a highest areal capacitance (1.4 mF cm^-2) among other hybrid films. The solid-state symmetric supercapacitor was assembled, which demonstrated fast-rate response and retained 100% of initial capacitance after 10000 cycles. When pairing up the hybrid thin film positive electrode with the PEDOT thin film negative electrode, the solid-state asymmetric supercapacitors exhibited a voltage window of 1.2 V and a transmittance of 84%. Furthermore, thin films with large area (100 cm²) was also sprayed and assembled into asymmetric solid-state supercapacitor, demonstrating its scalability.