Exploration for the Gratings Used for Auto-Stereoscopic Three-Dimensional Printing

In this paper, parallax-barrier gratings, lenticular lens gratings and spherical crown gratings which are the three kinds of main gratings for auto-stereoscopic three-dimensional printing are introduced. Besides, the principle for these three kinds of gratings is explored. According to the analysis, when different gratings are used for auto-stereoscopic three-dimensional printing，different effects will be obtained. The principle of parallax-barrier gratings is transmission pinhole imaging formation, and the presswork looks comfortable but transmission of light is worse as used parallax-barrier grating. The correspondence principle of lenticular lens gratings is convex lens imaging due to refraction and reflection. Therefore, the stereoscopic images can be only seen in the orientation perpendicular to the array of lenticular lens. While, as the principle of scatter of spherical crowns, the stereoscopic images can be seen in each azimuth when used spherical crown gratings for auto-stereoscopic three-dimensional printing. In the end, a series of further measures are raised to improve the common grating used for auto-stereoscopic three-dimensional printing.