A display device comprising: a flexible display panel; a frame adjacent to the display panel; a panel roller coupled to the frame, the display panel being wound around or unwound from the panel roller; a first foldable link (220a, 230a, 240a) having one end pivotably connected to the frame and the other end pivotably connected adjacent to a lower side of the display panel unwound from the panel roller; a second foldable link (220b, 230b, 240b) having one end pivotably connected to the frame and the other end pivotably connected adjacent to the lower side of the display panel unwound from the panel roller, the second foldable link (220b, 230b, 240b) positioned opposite to the first foldable link (220a, 230a, 240a); a motor mounted to the frame between the first foldable link (220a, 230a, 240a) and the second foldable link (220b, 230b, 240b); a first gear box mounted to the frame adjacent to the first foldable link (220a, 230a, 240a), the first gear box having a first link gear configured to rotate with a pivot shaft of the one end of the first foldable link (220a, 230a, 240a) and a first worm gear engaged with the first link gear (3 10a); a second gear box mounted to the frame adjacent to the second foldable link (220b, 230b, 240b), the second gear box having a second link gear configured to rotate with a pivot shaft of the one end of the second foldable link (220b, 230b, 240b) and a second worm gear engaged with the second first link gear; and a driving shaft (343a, 343b) configured to transmit power provided by the motor to the first gear of the first gear box and to the second gear of the second gear box, the first worm gear and the second worm gear being configured to rotate in a same direction with respect to a rotational direction of the driving shaft (343a, 343b). a flexible display panel; a frame adjacent to the display panel; a panel roller coupled to the frame, the display panel being wound around or unwound from the panel roller; a first foldable link (220a, 230a, 240a) having one end pivotably connected to the frame and the other end pivotably connected adjacent to a lower side of the display panel unwound from the panel roller; a second foldable link (220b, 230b, 240b) having one end pivotably connected to the frame and the other end pivotably connected adjacent to the lower side of the display panel unwound from the panel roller, the second foldable link (220b, 230b, 240b) positioned opposite to the first foldable link (220a, 230a, 240a); a motor mounted to the frame between the first foldable link (220a, 230a, 240a) and the second foldable link (220b, 230b, 240b); a first gear box mounted to the frame adjacent to the first foldable link (220a, 230a, 240a), the first gear box having a first link gear configured to rotate with a pivot shaft of the one end of the first foldable link (220a, 230a, 240a) and a first worm gear engaged with the first link gear (3 10a); a second gear box mounted to the frame adjacent to the second foldable link (220b, 230b, 240b), the second gear box having a second link gear configured to rotate with a pivot shaft of the one end of the second foldable link (220b, 230b, 240b) and a second worm gear engaged with the second first link gear; and a driving shaft (343a, 343b) configured to transmit power provided by the motor to the first gear of the first gear box and to the second gear of the second gear box, the first worm gear and the second worm gear being configured to rotate in a same direction with respect to a rotational direction of the driving shaft (343a, 343b).