The application of LED display technology in highway traffic guidance screen

Time:2018-11-28 Views:135

With the vigorous development of expressway in China, intelligent traffic management plays an increasingly important role in ensuring safety and improving traffic management efficiency.Traffic information release system is also called induced traffic information system, is the main part of expressway monitoring system, is the intelligent transportation system (IntelligentTransportationSystem) ITS main means of display.As one of the intelligent traffic management methods of information release carrier LED variable intelligence board, can display all kinds of images and text, notify all kinds of traffic conditions and meteorological information, issued traffic instructions, to ensure traffic safety.The image and text displayed can be compiled and stored in the variable intelligence board controller in advance, or compiled and reissued at any time on the computer controlling the variable intelligence board.

In the information age and rapid development of intelligent transportation systems (its) today, in the field of public transportation service for the society, information release became important service content, all kinds of information display device as airports, railway stations, docks, bus stations, highways, highway service area, urban road and parking lot the dominant means to release information to the public.Led display is favored for its high brightness, high reliability, long life and low power consumption.

LED electronic display screen is an ideal public information display media for displaying text, images, two-dimensional or three-dimensional animation, television, video, VCD and other video signals. The display technology has been widely used in many fields of social economy, among which the display of traffic information is one of the important application fields.LED display is a new type of flat-panel display device, in the 1990 s is a concentration of optoelectronic technology, microelectronics technology, computer technology and video technology is one of the high-tech product, its luminous part made up of LED (light emitting diode) assembled, its advantage is less power consumption, high brightness, clear images and bright colors, long life and stable performance.

The display surface of the variable intelligence board is generally composed of LED display array. Each light emitting unit in the display array is also called a pixel, and each pixel is composed of different light emitting base colors (red, green, blue and yellow)LED tubes in a certain proportion.The variable intelligence board itself has the functions of display drive, detection and control, and is equipped with remote communication interface to communicate with the center.

At present, there are two types of display screens commonly used on highways: one is a dual-base color display screen, which is red and green, with 256 levels of gray and can display 65,536 colors;The other type is full color display, which is red, green and blue. A 256 level full color display can display more than 16 million colors.

In order to reduce highway traffic congestion and traffic accident frequency, to improve the highway operation conditions and the existing security guarantee system, reduce the number of traffic accidents, traffic congestion and secondary accidents, delay and loss brought by the crowded, should give full play to the role of the highway information release system, for highway safety, high speed and smooth running.

Various forms of LED screens have become the main release carrier of traffic guidance information. The common ways of traffic guidance LED display include LED display variable intelligence board, path indicator, variable sign and so on.Outdoor LED display of traffic guidance information, according to the requirements of road traffic management and the actual situation of traffic guidance information release and display, has the following characteristics in the specific use function: high brightness, reasonable perspective;The display colors are mainly red, green and yellow.Display brightness automatically adjustable;All-weather work, complex environmental conditions;Remote control, intelligent detection;High security, real-time, accuracy and reliability.

1. Gantry type variable electronic display screen

Variable conveyor electronic intelligence screen is a major way of information dissemination, the highway due to large volume generally adopt gantry across the road as the framework of the variable electronic display, by the main control computer through the communication network for remote control, transmission and display a variety of graphic information, different sections of the road to the driver in a timely manner and all kinds of traffic information, and traffic regulations, traffic knowledge propaganda, reproducibility to reduce highway congestion, reduce the influence of highway the reproducibility of accident, and improve the driving safety purposes;Thus effectively dredge traffic, improve the efficiency of highway use.

2. Variable speed limit screen (board)

Variable speed limit display screen is mostly set in some complex road conditions or the key sections of extra-large Bridges, mostly circular or single-arm suspension single-block screen.The computer of the monitoring center implements remote control through the communication network, transmits and displays the speed limit mileage or short traffic information of this section of road to remind the vehicle to drive according to the speed limit and ensure the safety of driving.

3. Mobile traffic information screen

When highway construction and maintenance, highway authorities or construction personnel temporarily close or change lanes, how to inform road users of traffic information is very important.Fixed variable information board is limited to the road construction site is not sure or the distance is far, not easy to play a role.And mobile traffic information screen (vehicle-mounted screen) has a small, flexible and light, suitable for installation on the trailer motor vehicle, can be placed at any time and anywhere in the target site direct display, to make up for the fixed variable intelligence board.

4. Guide indicator (alarm) screen

In order to ensure the safety of highway construction workers, vehicles and other normal driving vehicles, highway operation vehicles must be installed with eye-catching high-brightness signs to warn and guide other subsequent vehicles to avoid accidents.But the guidance warning screen is the highway construction work vehicle essential equipment.

5. Service screen

Service led display refers to the charging station area, service area installed to provide all kinds of services, publicity led equipment.Through toll plaza, service area parking lot, indoor installation of all kinds of LED screens in a timely manner for the past passengers and drivers to provide real-time road conditions and service help and other information, facilitate the travel of passengers and drivers, improve the level of road management and external image.

Six, the concluding

Highway LED information release system not only enhances the speed and safety of highway operation, but also improves the operation efficiency. More importantly, it has achieved good social benefits.It is believed that the system will play an increasingly important role on the expressway with the continuous increase of the expressway mileage, the continuous improvement of computer technology and the continuous improvement of highway monitoring technology.