This paper introduces the application of LED display screen in traffic, and introduces in detail the design method of LED dynamic display screen based on dual CPU and dual-port RAM, the control of three colors of the display screen, and the realization of scanning drive circuit. Finally, a method of extracting Chinese character dot matrix under VB6.0 is given. The actual operation shows that this method is very practical. With the rapid development of urbanization and transportation, in the research and development of intelligent transportation system (ITS), traffic guidance information system is the main means to solve traffic congestion, ensure traffic safety, and improve the efficiency of traffic network. The release of traffic information is an important part of the whole guidance system that plays a direct role. It is used to release traffic instructions, road conditions and other information in real time to improve the traffic capacity of the road. LED dot matrix display screen has become an important way to release traffic information with its advantages of bright colors, high brightness, long life, stable and reliable operation. Single primary color (red or green) LED display screen often cannot meet the differences in information classification and viewing angle, and traffic information is mainly for vehicle drivers. Since the time that vehicles stay in the visible distance is very short, complex multi-grayscale graphics and animation content should be avoided to avoid interfering with drivers. In the display screen system that uses two primary colors to realize red, yellow and green, red, yellow and green are common colors in the field of traffic, representing prohibition, warning and consent slogans respectively, which can achieve the effect of color change, give people a visual difference, and match the color of the signal device of the traffic control department. Using dual CPU and dual-port RAM to make a large three-color graphic display system, the data processing and transmission are completed by two independent CPUs respectively, which not only improves the processing speed and stability of the system, but also makes the software design relatively simple.
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