This article describes a high resolution aerial 3D display using a time-division multiplexing directional backlight. In this system, an aerial real image is generated with a pair of large convex lenses. The directional backlight is controlled based on the detected face position so that binocular stereoscopy may be maintained for a moving observer. By use of the directional backlight, the proposed system attains autostereoscopy without any moving parts. A wide viewing zone is realized by placing a large aperture convex lens between the backlight and the LCD panel. With the advantage of time-division multiplexing, a high resolution 3D image is presented to the viewer.