LED display is a common display device, widely used in a variety of places, such as billboards, store signs, station screens and so on. With the continuous progress of technology, the development of LED display is also getting more and more attention. In this paper, we will discuss the classification, principle, application and other aspects of LED display in a comprehensive manner. Classification of LED display screen LED display screen according to its different light-emitting principle, can be divided into LED digital tube, LED dot matrix screen, LED video screen and so on several types. LED digital tube is a kind of display equipment to display the number by flashing bit by bit, has the advantages of low power consumption, high brightness, high reliability and so on. LED dot matrix screen is a kind of display equipment which is composed of dot matrix modules, can display LED video screen is a kind of display equipment through the video signal to display, can display video images, with high definition, high brightness and other advantages. Principle of LED display The principle of LED display is to display images or text through the brightness of LED lights.LED lights are a kind of light-emitting diode, with unidirectional conductivity and high brightness, high luminous efficiency and other advantages. In LED display, LED lights are mounted on the circuit board, and the LED lights are controlled by the control circuit on the circuit board. When an image or text needs to be displayed, the control circuit will control the LED lights to light up or go out, so as to realize the display effect. Application of LED display LED display has a wide range of applications, mainly used in various places of advertising, information display and so on. In terms of advertising, LED display can be used to make billboards, store signboards, station screens, etc. It can display products and services through dynamic images and text to attract more users. In terms of information display, LED display can be used to make information kiosk, electronic newspaper reading board, etc. It can facilitate the life of the public by displaying real-time news, weather forecast and other information. In addition, LED display can also be used in stage performances, sports competitions and other fields, which can convey information by displaying images, text, video and other content. The development trend of LED display screen With the continuous progress of technology, the development of LED display screen is also getting more and more attention. In the future, the development trend of LED display screen mainly has the following aspects. First, the development of high-definition and high-contrast. As people's requirements for picture quality continue to improve, the clarity and contrast of LED display will also continue to improve to meet people's needs. The second is to the intelligent development. In the future, LED display will gradually develop in the direction of intelligence, through the connection with the Internet, remote control and real-time monitoring.

Future LED display will have more interactive features, such as touch screen, voice recognition, etc., to facilitate the use of people. Third, to the development of energy saving. With the increasing awareness of environmental protection, the energy saving of LED display will also become the future development trend. In the future, LED display will use more efficient LED lights to reduce energy consumption. At the same time, more advanced control circuits will also be used to improve the brightness and contrast of the LED display, so as to realize energy saving. Fourth, to the development of thin and light. In the future, LED display will be more and more thin and light to facilitate people's carrying and use. At the same time, the appearance of the LED display design will also be more fashionable to meet the pursuit of beauty. In short, LED display as a common display device, the future development will be more extensive and in-depth, in order to meet the growing needs of people.