A display apparatus is disclosed. The display apparatus includes a display panel that displays at least one of a two dimensional (2D) image and a three dimensional (3D) image, and a driver that is driven so as to display an image on the display panel. The driver includes a 3D image conversion unit that converts the 3D image into a protective image if a length of a period during which the 3D image is displayed on the display panel is longer than a length of a first period.