Em processo de aprovação de grandes outdoors de LED, Shenzhen also has strict restrictions on the areas and road sections to be set up. Por exemplo, LED billboards should not be too close to residential areas and should generally maintain a distance of at least 20 meters from the opposite residential area. LED billboards should not affect traffic, should not face intersections directly, and large billboards should have their brightness lowered after 10 pm.
What is light pollution?
The brightness of sunlight is 2000CD (CD is the brightness parameter, called lumens), which exceeds twice the brightness of sunlight. When viewed directly, the human eye may feel uncomfortable. The international brightness standard for outdoor LED displays is 5000CD, and exceeding 5000CD is defined as light pollution.
It is reported that there is no unified legal standard for the brightness of outdoor LED display screens in China, but generally adjusting the brightness to 5500CD is the most suitable, and it is best not to exceed 6000CD.
1、 Adopting a brightness adjustment system that can be automatically adjusted by the system
The brightness of the environment varies greatly during the day and night, at different times and locations. If the playback brightness of the LED display screen is greater than 60% of the ambient brightness, we will clearly feel discomfort in the eyes, which means it causes light pollution to people. By using an outdoor brightness collection system, environmental brightness can be collected at any time. The display control system automatically converts the broadcast brightness suitable for the environment through software by receiving system data.
2、 Multi level grayscale correction technology
The ordinary display system uses an 8-bit color display hierarchy, which results in stiff colors in some low grayscale and color transitions. It can also cause discomfort with colored light. The new LED screen control system adopts a 14 bit color display hierarchy, greatly improving the hardness of colors in transition. Enable people to feel soft colors while watching. Avoid people’s discomfort with light.
3、 Reasonable selection of installation location and reasonable planning of display screen area
There is an empirical plan for viewing distance, ângulo de visão, and display area, while image research has specific design requirements for display screen viewing distance and viewing angle. When designing display screens, efforts should be made to meet design requirements and plan reasonably.
4、 Selection and design of playback content
LED screens are public media, including public welfare, publicidade, and indicator categories. When selecting the content to be played, we must reach an agreement with the public’s requirements and avoid rejection psychology, which is also an important aspect of preventing screen light pollution.
It is important to solve the problem of light pollution in LED screens. While using technical means and policies and regulations to minimize light pollution, it is also necessary to coordinate the needs of advertisers and the viewing psychology of the public. Only by using LED screens in a reasonable and scientific way can they add luster and color to our city!
