At present, the light pollution of LED display screens is generally divided into three categories in the world, namely white light pollution, artificial daylight and colored light pollution. At present, China only has relevant regulations on the glass curtain wall in the white pollution, and there is no relevant regulation on artificial daylight and colored light pollution. However, considering that colored light pollution does cause people to feel uncomfortable, it is necessary to consider the problem of preventing and controlling light pollution of the display screen when designing the LED display screen.
1. Adopt a brightness adjustment system that can be automatically adjusted by the system
We know that during the day and night, the brightness of the environment varies greatly at different times and places. If the playback brightness of the LED display is greater than 60% of the ambient brightness, we obviously feel that our eyes are not suitable, which means that it causes light pollution to people. Through the outdoor brightness collection system, the environment brightness can be collected at any time. The display level control system automatically converts the broadcast brightness suitable for the environment through the software by receiving the system data.
2. Multi-level grayscale correction technology
The 8-bit color display gradation adopted by the ordinary display screen system makes the color blunt at some low gray levels and excessive color. It will also cause incompatibility of colored light. The new LED large screen control system uses a 14-bit color display level, which greatly improves the hardness of the color on the excessive. So that people can feel soft colors when watching, to avoid people's discomfort with light.
3. Reasonable choice of installation location and reasonable planning of display screen area
There is an empirical plan for viewing distance and viewing angle and display area, and image research has specific design requirements on the viewing distance and viewing angle of the display screen. In the design of the display screen, it should meet the design requirements as much as possible and plan reasonably.
Fourth, the selection and design of playback content
The large LED screen is a public medium, including public welfare, advertising, and instructions. When we choose to play the content, we must agree with the public's requirements to avoid refusing to watch. This is also an important aspect of preventing and controlling display screen light pollution.
The LED diode itself is a green light source. Although the large-scale LED large-scale display screens used in clusters do cause a certain degree of colored light pollution because of design considerations and operational requirements, this contradiction is inevitable, and It cannot be completely eradicated. Only by adopting technical means, policies and regulations to minimize colored light pollution, and coordinate the needs of advertisers and the viewing psychology of the public. At the same time, we also see that the light pollution of the LED display has been greatly reduced compared to the neon and white light box advertisements today. And the LED electronic display screen also has the advantages of energy saving and rich colors, and will definitely replace the neon outdoor lighting and information display.
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