A foldable body is adapted to be connected between two neighboring ones of a plurality of supporting units, such that the two neighboring supporting units are moved relative to each other to flatten or bend a flexible display panel mounted on a supporting surface of each of the supporting units. The foldable body includes a main track and a main shaft. The main track is fixedly connected to one of the two neighboring supporting units. The main shaft is fixedly connected to the other of the two neighboring supporting units and is coupled to the main track to be translated and rotated in the main track. The two neighboring supporting units are connected by the foldable body, such that the supporting units are moved, such as being translated, rotated, or both, relative to each other, to bend at least a portion of the flexible display panel.