1. An identification device for a hidden image, comprising a lens having a micro-structure with the same level of array-distance in responsive to an array of pixels of a 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 super positioned or spatially aligned, a hidden image is shown by the phase shift between said array of pixels and said micro-structure of said identification device, wherein said lens is one of single or polymorphous lens structure, wherein said micro-structure of a lens surface of said lens is a convex lens, wherein a radius value of said micro-structure is r=f−(2×Mf×Sf×If), wherein f is the setting distance between said lens surface of said convex lens and surface of said product, wherein Mf is the refraction coefficient of the medium of said lens, wherein Sf is the proportion of said surface of the product to said density of array pixels, wherein If is the release of the contraction rate of the procedure of making said lens.