The present invention includes a carrying frame with two connecting ends for pivotally connected to a supporting frame for mounting the display, and two pivots are respectively mounted at the positions where the connecting ends of the carrying frame are pivotally connected with the supporting frame, wherein one pivot is penetrated through a hook flange washer and a positioning flange washer, wherein the hook flange washer has plural protruding portions located at one side of the edge thereof, and the positioning flange washer correspondingly has plural bulges located at one side of the edge thereof for forming a position-limiting trough to reject with the protruding portion, and the other pivot is penetrated through plural positioning washers and at least a plate type washer, so that when the carrying frame has a turning, the required torsion can be provided by the rejection between the protruding portion and the position-limiting trough.