Use of LED traffic guidance screen

　　The outdoor application of LED displays has been very mature. LED displays are often used in squares, aviation, highways, stages and other fields. Recently, LED displays have also been further developed and used in the security industry; and LED displays The application of screens in traffic has always occupied a dominant position. What are the general requirements for outdoor traffic guidance full-color LED displays:

　　1. The release of road traffic guidance information with high brightness and reasonable viewing angle is mainly for vehicles on the road. The viewing angle of the display screen is not high, and it is generally about ±35° on urban roads. Traffic guidance outdoor LED display works continuously for 24 hours. In the case of direct sunlight on the surface of the display screen, the display content should be clearly visible, so higher brightness is required. Under normal circumstances, the visual distance is required to be about 200m.

　　2. The display color is mainly red, green and yellow. The release of traffic information is mainly for dynamic driving vehicles. The staying time of the driving vehicles within the visible distance is very short, so the use of complex multi-gray graphics and animations should be avoided. Content, the display content is mostly text and simple graphic signs. Taking into account the common colors of traffic sign signals, red, green, and yellow three-color display screens are usually used. The three colors of red, green and yellow can respectively display prohibition, indication suggestion and warning information.

　　3. The brightness of the display is automatically adjustable. The outdoor LED display for traffic guidance information works 24 hours a day, and the environmental illuminance changes greatly. It is necessary to ensure that the display screen is clearly visible when the maximum ambient illuminance is 100 days in a sunny day, but also to avoid the "glare" phenomenon in rainy days and night. The brightness of the LED display screen needs to be automatically adjusted according to the environmental illuminance. Under normal circumstances, the brightness of the outdoor LED display for traffic guidance should be automatically adjusted above level 8.

　　4. Work around the clock, with complex environmental conditions. Traffic guidance LED displays work under complete outdoor conditions. The environmental conditions are complex. The requirements for temperature, power supply, rain, moisture, corrosion, and lightning protection are complex, and at the same time they are very demanding. High reliability requires special targeted measures to be taken. In the structural design of the outdoor LED display for traffic guidance information, attention should be paid to the heat dissipation, waterproof and dustproof issues of the display body. The unit box structure design of the display should meet the requirements of IP65 protection level.

　　5. Remote control, intelligent detection of traffic guidance LED display installation locations are distributed in a larger area, generally remotely controlled by the control center. The daily maintenance and inspection of the display screen is difficult, so it must have the corresponding remote control and fault diagnosis and inspection functions. Generally, the temperature of the cabinet should be automatically detected and adjusted to make the LED work within the appropriate temperature range to ensure the service life of the display.

　　6. High requirements for safety, real-time, accuracy, and reliability. Traffic guidance information is released to the public, with high requirements for real-time, accuracy and reliability. In order to ensure the stability and reliability of the traffic guidance LED display, the display control system and software are used. The selection and quality requirements of LED pixel tubes, integrated circuits, etc. should be based on stability and reliability.

　　At the same time, traffic guidance LED display screens generally work in a network environment for public information release, and they also have higher requirements for safety. Traffic guidance LED display mainly considers the location, the color of the display, the brightness of the LED display, the remote requirements, safety, real-time, accuracy, and reliability.

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