A display device includes a light blocking panel; a transparent display panel; a three-dimensional (3D) panel; a mask generating unit that generates a first mask from a difference between a left eye image and a right eye image that indicates whether or not viewpoint disparity is generated in each block of the 3D panel, and a second mask indicating whether each block of the light blocking panel is transparent or opaque; and an image processing unit that generates the display image from the left and right eye images and the first mask, wherein the display image is divided into a first region first region that includes an interlaced image generated by alternately arranging left eye image pixels and right eye image pixels, and a second region that includes a 2D image generated from one or both of the left eye image and the right eye image.