1. An autostereoscopic 3D display device, comprising: an image panel comprising a plurality of sub-pixels that collectively output light corresponding to a plurality of view images; a 3D filter disposed on a surface of the image panel, the 3D filter forming the plurality of view images within a plurality of viewing zones by directing the outputted light of the plurality of sub-pixels to the plurality of viewing zones, wherein each of the plurality of viewing zones overlaps one or more other viewing zones, and each of the plurality of view images is formed in a corresponding one of the plurality of viewing zones; and an intervening layer positioned between the image panel and the 3D filter, the intervening layer maintaining a gap between the image panel and the 3D filter; wherein a width of each of the plurality of viewing zones is set to a/n times (where a and n are natural numbers satisfying the condition: a<n) of an interocular distance, the interocular distance being a distance between an observer's eyes, and wherein when a width of the viewing zones is 1/n times of the interocular distance while having an I (where I =2, 3, 4,. .. ) overlapping structure of the viewing zones, n+(2I -3) viewing zones further exist between the observer's eyes, I representing a number of other viewing zones with which a given viewing zone overlaps.