This invention involves organic light-emitting diodes (OLEDs) in fabricating arbitrary-patterned, transparent devices with a highly transparent electrode made of composite, multilayer metal oxide structure, which exhibits transparency up to 90% and a sheet resistance as low as 5 ??/??. Extraordinarily superior optical and electrical properties enable the virtual OLEDs to be operated at a low driving voltage and provided with a transparency of 75%. Since the patterns and colors are easily tunable, this invention allow the potential for being widely used in advertising, showcase, flat panel display, and other advanced applications that required indicators. In the near future, the integration of OLEDs into transparent materials such as glass, window, car windshields, and objects in arbitrary shape are feasible prospects of these ??invisible indicators?? to afford users?? convenience and unprecedentedly visual experience.