The liquid crystal (LC) variable focus lens combining LC Fresnel Zone Plate with spherical lens (FZP-S) presented in
the paper is an electro-optical system using the applied voltages to control the variation of its focal length. Theoretical
study for the mathematic model of the hybrid FZP-S lens shows that the focus length of the hybrid lens can use the
similar method to that of the system with conventional refractive lens. The LC FZP with the electrodes widths vary as a
FZP which was fabricated on a glass substrate with two layers of transparent electrodes in our experiment. The minimum
of the electrodes width is 1.2um.The advantage of such system is that the focal length of which can be changed
electrically without mechanical movement. The effect of the focus length variation was verified by the experiment results.