A stacked structure formed of two active element (AE) layers includes: a first substrate; a second substrate; a first conductive surface and a second conductive surface totally formed on the first substrate and second substrate, respectively, and including an active region and a connecting region; a compression space between the first active region of the first conductive surface and the second substrate; an elastic layer including a plurality of elastic nodules spanning the compression space and contacting the second substrate, formed on the active region of the first conductive surface or on an exposed surface of the second substrate, the elastic nodules compressed in response to a voltage difference between the first and second conductive surfaces or to an external force; a conductive adhesive contacting the connecting region of the first and second conductive surfaces; and a conductive element coupled to the conductive adhesive, for electrically connecting the AE layers.