a cover module having a storage space therein;

a display panel configured to be at least partially disposed inside the storage space or withdrawn outside the storage space; and

a first driving system configured to embed and withdraw the display panel into and from the cover module in a first direction,

wherein the first driving system includes a first wire drum, a first driving wire, and a plurality of pulleys, and

wherein the first wire drum includes a first winding part and a second winding part, and the first driving wire has a first end wound around the first winding part of the first wire drum, spans the plurality of pulleys and has a second end wound around the second winding part of the first wire drum.