5D printing is a combination of digital technology and traditional printing output technology. It uses a series of stereo images to form a picture, and the surface of the picture is covered by a layer of grating. The purpose of the grating is to cause light at any different point on the picture to enter the left and right eyes of the person in a particular direction. According to research, when our human eye observes a three-dimensional object, since the two eyes are horizontally separated at two different positions, the observed image of the object is different, and there is an aberration between them due to this aberration. The existence, through the human brain, we can feel the depth of a three-dimensional world, this is the so-called stereoscopic principle. In this way, people don't need to train, and they don't need tools such as instruments to put the pictures directly in front of them and clearly feel the wonderful fun of three-dimensional painting.

 

　　If the image is composed of a series of continuous animations, then when the eyes move up and down or the grating is flipped up and down, the angle between the eyes and the grating will change. We will also see successive images one after another, that is, see an animation effect of the painting.