Optical design of an image magnifier based on a lens array is presented. The proposed image magnifier does not have a limit for object size due to off-axis aberration because the object is divided into segments and is kept apart from the nearest neighbor segment with the period of the lens array. Several images can be sequentially generated by magnifying sequentially specific objects among mosaic objects, which are composed of multi-images. The designed lens for the image magnifier corresponds to a lens array with an aperture of 2 mm and a magnification ratio of 3. Furthermore, an application for a display system of the designed image magnifier is also presented.