The present invention provides a multi-component composite film comprising a) polymer support layer; and b) porous gellable polymer layer which is formed on one side or both sides of the support layer of a), wherein the support film of a) and the gellable polymer layer of b) are unified without the interface, a method for preparing the same, and a polymer electrolyte system applied the same. A peripheral interface includes a first power node and a second power node. Further, the preferred embodiment of the present invention incorporates the effect of density of the data along each dimension. The resistance measuring unit measures electric resistances of the intersecting areas via the first and second conductors. The memory module is coupled to the CPU for recording the abnormal event data. A light source positioned at or adjacent the edge of the panel, which selectively generates light and directs the light in an initial direction into the panel.