A display apparatus comprising: a display device including a display panel configured to display an image on a front surface of the display panel and a back cover disposed at a rear surface of the display panel; and a curvature variation device disposed at the back cover and configured to vary a curvature of the display panel, wherein the curvature variation device comprises: an arc member disposed at a rear surface of the back cover and extending in a curved shape in a first direction; a supporting plate disposed at the rear surface of the back cover; a rotation driver disposed on the supporting plate; a linear gear disposed on the supporting plate and configured to perform a linear motion in a second direction intersecting along the first direction when driven by the rotation driver; a rotation link part coupled to a center portion of the arc member and engaged with the linear gear to perform a rotational motion corresponding to the linear motion of the linear gear to rotate the arc member about an axis in the first direction; and a holder part rotatably supporting the center portion of the arc member on the supporting plate; wherein the arc member comprises a first arc member and a second arc member respectively disposed at the rear surface of the back cover and spaced apart from each other in the second direction, and wherein the rotation link part comprises a first rotation link gear coupled to a center portion of the first arc member and a second rotation link gear coupled to a center portion of the second arc member; and wherein the first arc member and the second arc member respectively have a curved shape curved in opposite directions, and wherein the first rotation link gear and the second rotation link gear are configured to rotate in opposite directions upon the linear motion of the linear gear to rotate the first arc member and the second arc member in opposite directions. a display device including a display panel configured to display an image on a front surface of the display panel and a back cover disposed at a rear surface of the display panel; and a curvature variation device disposed at the back cover and configured to vary a curvature of the display panel, wherein the curvature variation device comprises: an arc member disposed at a rear surface of the back cover and extending in a curved shape in a first direction; a supporting plate disposed at the rear surface of the back cover; a rotation driver disposed on the supporting plate; a linear gear disposed on the supporting plate and configured to perform a linear motion in a second direction intersecting along the first direction when driven by the rotation driver; a rotation link part coupled to a center portion of the arc member and engaged with the linear gear to perform a rotational motion corresponding to the linear motion of the linear gear to rotate the arc member about an axis in the first direction; and a holder part rotatably supporting the center portion of the arc member on the supporting plate; wherein the arc member comprises a first arc member and a second arc member respectively disposed at the rear surface of the back cover and spaced apart from each other in the second direction, and wherein the rotation link part comprises a first rotation link gear coupled to a center portion of the first arc member and a second rotation link gear coupled to a center portion of the second arc member; and wherein the first arc member and the second arc member respectively have a curved shape curved in opposite directions, and wherein the first rotation link gear and the second rotation link gear are configured to rotate in opposite directions upon the linear motion of the linear gear to rotate the first arc member and the second arc member in opposite directions. an arc member disposed at a rear surface of the back cover and extending in a curved shape in a first direction; a supporting plate disposed at the rear surface of the back cover; a rotation driver disposed on the supporting plate; a linear gear disposed on the supporting plate and configured to perform a linear motion in a second direction intersecting along the first direction when driven by the rotation driver; a rotation link part coupled to a center portion of the arc member and engaged with the linear gear to perform a rotational motion corresponding to the linear motion of the linear gear to rotate the arc member about an axis in the first direction; and a holder part rotatably supporting the center portion of the arc member on the supporting plate; wherein the arc member comprises a first arc member and a second arc member respectively disposed at the rear surface of the back cover and spaced apart from each other in the second direction, and wherein the rotation link part comprises a first rotation link gear coupled to a center portion of the first arc member and a second rotation link gear coupled to a center portion of the second arc member; and wherein the first arc member and the second arc member respectively have a curved shape curved in opposite directions, and wherein the first rotation link gear and the second rotation link gear are configured to rotate in opposite directions upon the linear motion of the linear gear to rotate the first arc member and the second arc member in opposite directions.