In order to realize autostereoscopic display, a new directional optic structure was proposed, which could provide a pair of parallax images time-sequentially aided with the human eye tracking system, and a high resolution multi-user parallax 3D displayer was invented.Its backlight control system based on single chip microcomputer was elaborated, in view of the crosstalk existed in 3D displays, three methods were put forward for improvement:reducing lit time ratio of backlight, refreshing LCD at a faster speed, and using Kalman prediction interpolation.As the experimental results shows, these methods can reduce the crosstalk effectively, and finally a strong 3D visual sense is achieved without loss of resolution.