According to embodiments, a display unit of an integral image processing device, which includes the display unit which reproduces all the elemental images of a 3D object as a 3D image, may include: a light source; and a reproducing lens array for integrating a plurality of individual elemental images, which are included in a patterned image that has patterned all elemental images and comprises all elemental images, and reproducing the individual elemental images as a 3D image.