The popular 3D glasses create 3D images by frequently shifting images between the two eyes. However, experiencers may feel dizzy or get headaches after wearing the glasses for a while. The disadvantages of 3D glasses provoked the emergence of naked-eye 3D technology. The greatest advantage of the glasses-free 3D technology is that it can create illusion of depth in an image without the constraint of glasses.
Naked-eye 3D display requires technologies such as the parallax barrier 3D technology, cylindrical lens technology, directional backlight technology and multi-layer display technology. The parallax barrier 3D technology is similar to the polarized 3D technology. It forms a vertical stripe series by using LCD touch, polarizing coating and polymer liquid crystal layer, thus creating the 3D stereo effect. The cylindrical lens technology creates the illusion of depth in an image by taking the same principle as that of water refraction. Instead of taking advantage of angle illusion to create the stereo display effect like the former two technologies do, directional backlight technology creates parallax by projecting 3D images into viewers' eyes in a sequential way, and forms the 3D stereo effect. Naked-eye 3D products have been widely used in many places because they are more real and stereo. Such places as museums and exhibition halls also adopt naked-eye 3D technology in displaying some precious cultural relics, which not only brings visitors visual enjoyment but also lowers the risk of cultural relics damage.