Provided is a display apparatus including a display layer including scan lines, data lines, and pixels, and defined by a first area exposed to an outside in both a closed state and an open state, and a second area, which extends from the first area in a first direction, is exposed to an outside in the open state, and in which at least a portion thereof is opposite to the first area in the closed state, a scan-driving circuit connected to the scan lines, deformation sensors arranged in the first direction and having resistance values corresponding to respective shapes of the display layer, deformation sensor drivers arranged in the first direction, respectively connected to the deformation sensors, and configured to drive the deformation sensors along the first direction, and a driving circuit configured to measure the resistance values of the deformation sensors.