A heat-dissipating structure mounted on the back of a display unit is disposed at a rear portion of a high-brightness display unit. The heat-dissipating structure includes a casing disposed at the rear portion of the high-brightness display unit and separated therefrom by a gap; casing heat-dissipating holes disposed at the periphery of the casing and communicating with the gap; control chamber corresponding portion protrudingly disposed at the casing to receive a control chamber; a control chamber corresponding portion having an opening communicating with the gap; control chamber heat-dissipating holes penetratingly disposed at the control chamber corresponding portion and communicating with the gap via the opening; fan corresponding portions penetratingly disposed at the casing and communicating with the gap; and fans disposed at the fan corresponding portions, respectively, such that air introduced into the gap is discharged from the control chamber heat-dissipating holes and the casing heat-dissipating holes.