1. Small-pitch outdoor LED display: At the moment of consumption upgrading, because outdoor LED display has a fixed position, it can become a regional symbol; it has various forms of expression and strong plasticity; it has high arrival rate, good communication effect and other media characteristics, and It has many advantages such as great influence on mobile people, stronger reality, repeatable appeals, and high information arrival rate. Therefore, although the LED display screen in China is still in its infancy, it has gradually entered our lives. As end users have higher and higher requirements for the display effect of the display, outdoor LED displays with smaller pitches are bound to be more popular.

According to the LED display * sight distance (* sight distance: the vertical distance from the position where all the content on the display can be clearly seen relative to the screen body) formula (pixel pitch [mm] * 3000 - pixel pitch [ mm]*1000) conversion, it can be seen that the conventional P10 and P8 display screens on the market have maximum viewing distances of 8-24m and 10-30m respectively. When viewed at close range, the "graininess" of the screen will be very obvious.

However, with the commercialization of outdoor LED displays, more and more LED displays are located beside business districts and bustling streets, becoming exquisite full-color doors or full-screen window displays, and the distance from the crowd is getting more and more Therefore, the dot pitch must be continuously reduced to ensure a high-quality viewing experience. With the increasing demand for close-up viewing, in turn, small-pitch outdoor LED displays below P5 have become an inevitable trend. It is precisely because of the outdoor LED display with a pitch of P5 and below, the large outdoor advertising screen is no longer "high above", and outdoor seating advertising and low-column advertising have become popular. Even within 5 meters, the picture still has clear and delicate visual effects, which enables the audience to watch at a close distance and strengthens the communication effect of the media.

2. The problem of light pollution of outdoor LED displays: As part of the city's "lighting project", the outdoor LED displays that flicker day and night on the streets not only add a lot of dynamism and beauty to the city, but also bring light pollution to many people. , In recent years, with the development of commerce, the environmental problems of light radiation caused by outdoor LED displays near urban business districts have caused more and more complaints from citizens. Especially with the government's emphasis on environmental protection and the improvement of residents' requirements for the living environment, the problem of light pollution cannot be ignored.

The "Environmental Protection Law" stipulates that enterprises and institutions that discharge pollutants shall take measures to prevent and control the pollution and harm to the environment caused by optical radiation generated in production, construction or other activities. Since the first "light pollution" lawsuit appeared in Jinan in 2002, "light pollution" has become a problem that every LED manufacturer must face and solve. The main responsible object of the display screen is not responsible, and on December 28, 2018, Li and others in Jiangjin District, Chongqing City won the case against the light pollution of the outdoor LED display, which once again sounded the alarm for many outdoor LED manufacturers, reminding Manufacturers should not unilaterally pursue brightness and cause additional consumption and pollution.