Employee clubs, by organizing various cultural and sports activities, strengthen employee exchanges, enrich employee lives, and promote the development of enterprises. By organizing employee clubs, strengthen employee physical fitness, enhance employee centripetal force, cohesion and sense of belonging; by organizing employee clubs, enhance employee family care and create a good working and living atmosphere for employees; by organizing employee clubs, break down communication barriers between departments and promote employee friendship between different departments; by organizing employee clubs, promote external exchanges and communication of enterprises, and enhance corporate brand value.

LED electronic screen has experienced from monochrome, two-color graphic display, to image display, to today's full-color video display. No matter in the period of performance (brightness LED display and blue light, etc.) and system composition (computerized full dynamic display system) have made great progress. The level of ultra-high brightness full-color video display that has been reached can be said to meet the requirements of various application conditions. Its application field has spread to transportation, securities, telecommunications, advertising, publicity and other aspects. The development of LED display in our country can be said to be basically synchronized with the world level, and has formed an industry with considerable development potential so far. It should be pointed out that our country's LED industry has not only achieved earth-shattering wins in application technology, but also has excellent performance in innovation ability. Compared with the rapid development of the domestic LED display industry, there are too few books on LED displays at present, which is not convenient for the design and manufacturing personnel and the use of maintenance personnel. Therefore, the idea of writing a book on LED display technology originated. At the invitation of the University of Electronic Science and Technology Press, I took the courage to write a book. The book describes the general situation of LED displays, LED display devices, graphic displays, image displays, video displays and other related technical issues, in order to enable readers engaged in various types of LED display work to get some useful materials from this book.