In order to enhance the normal view angle of stereoscopic displays based on parallax illumination, the fundamental way is to restrict the width of the illuminating slit within narrow limits. But the knotty problem is that thin slit will dim the backlight and as a result dropping the brightness of display. A novel architecture to enable base liquid crystal displays to be higher brightness, lower cross talk and auto-stereoscopic mode is described in this paper. A high efficient parallax backlight comprising a recycle barrier block is placed at a distance behind an existing TFT-LCD panel. The barrier provides a series of bright illuminating slits for the parallax image pixels on the display panel and projects the alternate image columns to the observer. The slit is narrow in width so that the display may give diamond-shaped viewing regions with a width of 65mm with slightly cross talk. It can be seen that at the optimum viewing distance from the screen, stereoscopic image can be seen without any glasses. In this paper, the implementation of the backlight component in the auto-stereoscopic TFT-LCD is described in detail and the simulated data are given. The configuration of the prototype and measured performance are presented.