Bravely say "NO" to outdoor large screen light pollution

Light pollution is harmful

Light pollution refers to things that have a negative impact on people's visual environment and physical health. Among them, LED display screen is one of the sources that cause serious pollution of color light. The brightness of the sunlight we usually see is generally 2000CD (CD is the brightness parameter), and the brightness of the outdoor LED display in the domestic market is generally set at 5000CD, 7000CD or even higher. Experts have found that people who work and live in a polluted environment for a long time, the retina and the iris will be damaged to varying degrees, the visual acuity drops sharply, and the incidence of cataract is as high as 45%. It also makes people feel dizzy and upset, and even suffer from symptoms such as insomnia, loss of appetite, depression, and physical weakness.

The LED full-color screen installed outdoors is lit for a long time. In order to meet the needs of the advertising owners, the video screen is beautiful, the pursuit of high brightness and all kinds of novelty and hunting content are not only easy to cause light pollution to the people coming and going, but also easy to disperse the vehicle flow. Attention, causing traffic accidents. At night, the brightness of the full-color screen is likely to cause pollution through the residents' windows, affecting people's lives and sleep.

In recent years, many citizens have reported that LED lights, neon lights and other colored light pollution near their homes can “turn over the wall”, and work all night, pervasive, causing unanimous resentment and condemnation. A recent study in the United States shows that about two-thirds of the world's people now live in light pollution. Experts call it "an environmental killer that directly affects the health of human beings." We must intervene early and strengthen supervision.

Solution suggestion

With the wide application of LED full-color screens and the pace of urbanization construction, various lighting pollution has become a real problem in large and medium-sized cities. Because this is a new kind of pollution, unlike the previous environmental pollution, the perception and understanding of light pollution in the community is not comprehensive enough, so the social legislation process is relatively lacking, and there is no specific and specific laws and regulations. This makes it more difficult to prevent and control light pollution, and it requires the efforts of the state, society and enterprises to jointly prevent and control.

First of all, legislation is the most important. China is a society ruled by law, and any social problem requires a set of laws and regulations that can be relied upon. Prevention and control of light pollution is a social system project, which requires relevant departments to formulate the necessary laws and regulations and take corresponding protective measures. What is more embarrassing is that there is no single-line law for light pollution. The handling of such disputes can only be based on some principled provisions scattered in the General Principles of Civil Law, the Environmental Protection Law, the Property Law and local regulations. It is not specific or systematic, which causes the embarrassment of judicial application and it is difficult to effectively protect the legitimate rights and interests of victims.

Second, make a fuss from the source of light pollution. LED display is a major cause of light pollution. Therefore, LED display industry and related companies need to try their best to reduce the degree of light pollution and ensure the beautiful image of LED display in outdoor advertising.

LED display causes light pollution mainly due to excessive area, high brightness, improper location, inappropriate content, and technical problems. As a result, industry and industry experts have made the following recommendations.

First, industry associations have formulated relevant standards for LED outdoor displays, including brightness standards, dimming principles, etc., and provided relevant qualifications to urge LED display manufacturers to deepen their awareness and prevention of light pollution.

Second, a reasonable plan for the installation of the display. In the downtown area of ​​the city, if the installation location of the display screen is too close to the pedestrian or too close to the nearby residents, the light pollution hazard is great; if the display screen area is too large and the installation position is not suitable, it is obviously easy to cause light pollution. Therefore, it is recommended that the display terminal user and the installer and the manufacturer have an experience plan for viewing distance, viewing angle and display area, and at the same time fully consider the situation in the design process to ensure that the display is beautiful and the installation is reasonable.

Third, the supervision and selection of the content to be played. The elbow on the technical hardware causes the light pollution of the full color screen to occur to a certain extent, and the content of the screen is increased. On the one hand, advertising owners tend to play beautiful and colorful advertisements to attract consumers. On the other hand, residents and pedestrians who are deeply polluted by light hope to alleviate this kind of harm. There is a contradiction between the two on the display video. Because the outdoor full-color screen faces a wide audience, it is necessary to coordinate the psychology of all parties, reach a consensus, and strengthen the supervision and control of the content.

Fourth, the display uses an adjustable brightness system. The LED full color screen installed outdoors is bright because of the day and night, and the ambient light required is different, so it is necessary to adjust the brightness of the screen. Through the automatic adjustment of the system, the LED display responds according to the ambient brightness, and then adjusts to the brightness suitable for the surrounding environment.

Fifth, the use of display multi-level grayscale correction technology. The technical research to prevent light pollution is also reflected in the grayscale correction technology of the display screen. The 8-bit color display level adopted by the ordinary display system makes the color hard in some low grayscales and excessive colors, which also causes the color light to be unsuitable. . The new LED large-screen control system adopts 14-bit and 16-bit color display levels, which greatly improves the hardness of the color in excess, so that people can feel the color softness when watching, and avoid people's discomfort to light.