1. A hidden image identification system, comprising a product and an identification device, wherein said identification device comprises a single layer or multi-layer lens having a micro-structure with the same level of array-distance in responsive to an array of pixels of said product, wherein selected areas of said array of pixels and said micro-structure of said identification device are entirely or partially phase shifted in a controllable manner, such that when said array of pixels and said micro-structure of said identification device are superpositioned or spacedly aligned at a predetermined distance, a hidden image of said array of pixels and said array of said micro-structure of said identification device is shown.