Mainly based on liquid crystal technology and the development of the variable zoom liquid crystal lens (Liquid Crystal Lens) components. This lens effectively utilizes the optical properties of the liquid crystal to make it have great potential for development. The electric field is controlled by the external voltage. The polarization direction of the photoelectric field is different from that of the liquid crystal molecule. The refractive index is also different. Into a similar GRIN Lens optical components, the advantage is that you can use the external electric field to control the focal length of the optical components, unlike the traditional optical lens for the fixed focal length. The most important part of the liquid crystal lens is to try to produce a refractive index difference, so that the refractive index for the gradient distribution, so that the light can focus or divergence. The structure of this liquid crystal lens is similar to the principle of liquid crystal screen, for two conductive glass (ITO) filled between the liquid crystal, and then use the electric field to control the refractive index of liquid crystal, and by the refractive index distribution (Gradient refractive index) to achieve the focus Function, while controlling the focal length, to make convex lens effect.