A method of forming a gate electrode of a semiconductor device includes forming a damascene pattern for fabricating a metal electrode on an upper part of a poly silicon gate so as to prevent a metal electrode from being oxidized when the poly silicon electrode and the metal electrode are formed simultaneously. The apparatus for displaying stereoscopic images includes a stereoscopic image-generating part, a main display part, a sub-display part, and a translucent reflective structure part. Sound generated by the woofer emanates to a surrounding environment through both the woofer chambers, wherein the enclosure defines a plurality of venting holes communicating with the other one of the woofer chambers. The elastic member is integrally formed with the main body. The position sensor detects the rotational position of the detecting shaft, thereby detecting the rotational position of the propeller. The flexible member extends in the first direction from a third point on the floating beam to the second rigid element.