Functional films capable of exhibiting various functions by the application method, and a method for producing the functional films are provided. The transistor includes a buffer layer on a substrate, and a poly-crystalline semiconductor layer on the buffer layer. The driving transistor may have a gate connected to the first node, a drain connected to the second node, and a source connected to a high-level source voltage terminal. The passivation layer is arranged having an opening positioned over the contact pad. This compound also increases both breaking strength and crushing strength of bones evidencing use in conjunction with bone replacement surgery such as hip and knee replacements. The grafts are obtained by reacting propylene-ethylene impact copolymers having specified rubber contents and molecular weight distributions with ethylenically unsaturated acids or acid derivatives, such as maleic anhydride.