In recent years, the focus of the new high-performance display is the near-infrared up conversion light-emitting display, which has the advantages of bright color, high brightness, long life, small size, etc., and also can achieve three-dimensional display is one of its advantages. At present, many workers are doing research in this area, and have made corresponding useful results. For example, Zheng Yan developed an infrared beam detection board, which is simple in structure, safe in use, reliable in performance, and can work effectively in the infrared band of 500-1500nm. As a display, it can not only emit red, green and blue visible light, but also has the advantages of clear eye spots and good visual effect.