Grating is a combination of digital technology and traditional printing technology, which can show different special effects on special films. Show the lifelike three-dimensional world on the plane, the smooth animation clips like a movie, and the incredible changing effect. A grating is a thin sheet of strip lenses. When we look from one side of the lens, we will see an image on the other side of the sheet as a very thin line, and the position of this line is determined by the viewing angle. Decide. If we print these several images on different lines, corresponding to the width of each lens, and print them on the back of the lenticular sheet in order and line, when we look through the lens from different angles, we will see different images.

Gratings are also called diffraction gratings. It is an optical element that disperses (decomposes into a spectrum) light by using the principle of multi-slit diffraction. It is a flat glass or metal sheet engraved with a large number of parallel equal-width, equidistant slits (scribed lines). The number of slits in the grating is very large, generally tens to thousands per millimeter. The monochromatic parallel light passes through the diffraction of each slit of the grating and the interference between the slits, forming a pattern with very wide dark fringes and very fine bright fringes. These sharp and bright fringes are called spectral lines. The position of the spectral line varies with the wavelength. When the polychromatic light passes through the grating, the spectral lines of different wavelengths appear in different positions to form a spectrum. The light passing through the grating to form a spectrum is a common result of single-slit diffraction and multi-slit interference.