A flexible device comprising: a flexible body; a lower piezoelectric layer of a first plurality of piezoelectric elements disposed on the flexible body; an intermediate layer disposed on the lower piezoelectric layer; an upper piezoelectric layer of a second plurality of piezoelectric elements disposed on the intermediate layer; and a controller configured to apply a drive signal to at least one of the first plurality of piezoelectric elements of the lower layer and the second plurality of piezoelectric elements of the upper layer, the drive signal causing the at least one of the first plurality of piezoelectric elements and second plurality of piezoelectric elements to deform, in response to detecting an event, wherein the first plurality of piezoelectric elements are disposed in a first, column-wise direction and the second plurality of piezoelectric elements are disposed in a second, row-wise direction, the flexible device characterized by: a flexible display panel supported by the flexible body; and at least one biosensor configured to detect a touch of a user, arranged on a lower side of a display, wherein the first plurality of piezoelectric elements and the second plurality of piezoelectric elements are disposed between the display and the at least one biosensor, and wherein, in response to the at least one biosensor detecting the touch of the user, the controller is configured to: selectively apply a first drive signal and a second drive signal to the first plurality of piezoelectric elements and the second plurality of piezoelectric elements so that the flexible device rolls around the user's body, and control the display to display a watch user interface. a flexible body; a lower piezoelectric layer of a first plurality of piezoelectric elements disposed on the flexible body; an intermediate layer disposed on the lower piezoelectric layer; an upper piezoelectric layer of a second plurality of piezoelectric elements disposed on the intermediate layer; and a controller configured to apply a drive signal to at least one of the first plurality of piezoelectric elements of the lower layer and the second plurality of piezoelectric elements of the upper layer, the drive signal causing the at least one of the first plurality of piezoelectric elements and second plurality of piezoelectric elements to deform, in response to detecting an event, wherein the first plurality of piezoelectric elements are disposed in a first, column-wise direction and the second plurality of piezoelectric elements are disposed in a second, row-wise direction, the flexible device characterized by: a flexible display panel supported by the flexible body; and at least one biosensor configured to detect a touch of a user, arranged on a lower side of a display, wherein the first plurality of piezoelectric elements and the second plurality of piezoelectric elements are disposed between the display and the at least one biosensor, and wherein, in response to the at least one biosensor detecting the touch of the user, the controller is configured to: selectively apply a first drive signal and a second drive signal to the first plurality of piezoelectric elements and the second plurality of piezoelectric elements so that the flexible device rolls around the user's body, and control the display to display a watch user interface. a flexible display panel supported by the flexible body; and at least one biosensor configured to detect a touch of a user, arranged on a lower side of a display, wherein the first plurality of piezoelectric elements and the second plurality of piezoelectric elements are disposed between the display and the at least one biosensor, and wherein, in response to the at least one biosensor detecting the touch of the user, the controller is configured to: selectively apply a first drive signal and a second drive signal to the first plurality of piezoelectric elements and the second plurality of piezoelectric elements so that the flexible device rolls around the user's body, and control the display to display a watch user interface. selectively apply a first drive signal and a second drive signal to the first plurality of piezoelectric elements and the second plurality of piezoelectric elements so that the flexible device rolls around the user's body, and control the display to display a watch user interface.