In order to make the intelligent monitoring system of the traffic monitoring command center building better meet the needs of daily management and emergency handling, this paper combines the development trend of future technology and deepen the design of each subsystem of the project according to the principle of moderate advancement, especially Conducted many investigations, research and learning exchanges for the large-screen display system. Finally, the LCD LCD splicing screen in the original "Jiangxi Provincial Traffic Monitoring Command Intelligent System Construction Plan" was adjusted to a high-definition small-pitch digital LED large-screen display system and the subsystem selection was adjusted from the display system index comparison and reality. The overall situation and dynamics of the system and the estimated budget of the system have been demonstrated.
Currently, display technologies used in large-screen display systems include DLP (rear projection), LCD (liquid crystal), and full-color LED. The following three display technologies are compared in terms of display effects, installation load-bearing, business applications, and operation and maintenance costs.
First, display system indicators comparison
(a) brightness
Brightness determines the visual effect. From the current point of view, the DLP display unit is marked with the lumen output of the projector. The value is generally 800-1000 lumens. If the brightness value is changed, the actual pre-screen brightness of the 67-inch DLP display unit should be 200-300cd. /m2, the front-end brightness value of the liquid crystal display unit is 700cd/m2, and the brightness of the high-definition small-pitch digital LED display system can be as high as 1200cd/m2 (Editor's Note: Indoors, the brightness is too high for users to watch for a long time. The high-performance driver IC can be used to make the LEDs have a small pitch and low brightness, and the display screen does not lose gray scale, and the eyes are comfortable and the picture is clear. Therefore, from the perspective of brightness, high-definition small-pitch digital LED display system is the best, LCD is better, DLP display system has the lowest brightness among the three, for the emergency command center, the lobby area is large, so high-definition small-pitch digital LED The display system has obvious advantages and adjustable brightness.
(2) Light effects
The effects of lighting determine the ability of the picture to adapt to the environment. Because the high-definition small-pitch digital LED display system has self-illuminating characteristics, the glass surface is not added to the screen surface, so even if there is strong illumination in the room, there will be no specular reflection on the screen surface or reflected light spots. The phenomenon of liquid crystal and DLP systems is greatly affected by ambient light due to the specular reflection of the surface of the display unit.
(3) Color saturation and color reproduction
Color saturation determines the brilliance of an image, and color reproduction determines how consistent the image is with a real, natural object. Because the high-definition, small-pitch digital LED display system is used for the display screen, the LED light gamut has a wide range, and the screen can display a very good color reproduction effect when displaying various pictures and video programs, which can perfectly reproduce the real world beauty. color. The display principle of liquid crystal and DLP display systems is essentially projection technology. Therefore, the color gamut range is small, and there is a certain gap between color reproduction and color saturation.
(four) resolution
The resolution determines the clarity of the picture. All systems can meet the business expansion requirements of 1920*1080 (Full HD) resolution.
(5) Physical seams
The physical seam determines the degree of segmentation of the picture. The display pixels of the high-definition, small-pitch digital LED display system screen are arranged by the point-like LED lights, and the display circuit unit produced by the high-precision manufacturing process ensures the spacing of each LED light of the display unit and the display unit box. The spacing of the LED lights between the bodies is uniform, there is no visible physical stitching gap, and there are no optical seams of other stitching screens. As the splicing display device, there is a splicing gap. In the overcoming of the physical seam, although the DLP splicing can achieve a physical seam of 1mm, the DLP system is still faintly visible in the whole screen display, while the LCD The physical seam of the display unit of the splicing display system is 5.5mm (Editor's Note: Currently LG has introduced LCD products with 1.8mm physical seams, but the seams are still obvious).
(6) Color consistency
Color consistency mainly reflects the color difference between display units. DLP will have chromatic aberration, and this phenomenon will continue to expand with the passage of time. Although the color difference can be adjusted, it is inconvenient for future application and maintenance; high-definition small-pitch digital LED display system and LCD large-screen system are basically non-existent. This question.
(7) Installation and load bearing
The DLP splicing display system has a large installation space, high requirements for the equipment room environment, and heavy equipment. According to the current computer room environment, if the calculation is based on 4x8, the optical DLP box needs to bear about 480kg/m2, plus the LED logo display. The decorative materials pose a great pressure on the current 600kg/m2 design load. If the maintenance personnel are added, the design bearing capacity may be exceeded. The high-definition small-pitch digital LED display system and the LCD splicing display system are easy to install and easy to maintain, and will not exist. Bearing the problem.
(8) Business application
All kinds of display systems can meet the current and future business application requirements. Each display system has system-level backup measures to meet the reliability requirements of emergency command and dispatch, but from the display information, high-definition small-pitch digital LED display system to the computer The display of VGA information has obvious advantages; the LCD splicing display system has many display units, and the display has advantages in the video monitoring mode. As a display system of the emergency command center, its function is not only to monitor images, but also to understand the development trend or the information around the dangerous situation in order to better allocate resources, and the LCD screen has relatively simple business applications in this respect.
(9) Operation and maintenance costs
The high-definition small-pitch digital LED display system and the LCD large-screen system will not be as sharply attenuated as other display systems after a long period of use. The screen does not need to be replaced with a light-emitting device. In comparison, under the same brightness, It can save operation and maintenance costs. At the same time, because the high-definition small-pitch digital LED display system equipment maintenance is mainly LED unit, and the liquid crystal and DLP system have projection and optical parts in addition to the illumination source, the high-definition small-pitch digital LED display system has lower maintenance cost. See Table 1 for a comparison of display system indicators.
Second, the overall situation and dynamics of the large screen display system
The three display technologies described above basically share the entire market share of the large screen display system according to their unique characteristics. Among them, because the essence of DLP splicing display technology is digital optical processing rear projection display technology, combined with high-speed graphics processing technology to achieve multi-channel signal processing, DLP has the advantages of high resolution, wide viewing angle, small joints, low maintenance costs, etc. Widely used in dispatching command, conference, industrial process control display, exhibition display, news broadcast, etc.; LCD splicing technology is based on the principle of liquid crystal display, combined with FPGA array technology and parallel high-speed graphics processing technology to achieve unified processing of multi-channel signals. Due to the high brightness, high definition and high color saturation of the liquid crystal technology, its single-screen display effect is good, which makes the liquid crystal splicing technology more applicable in outdoor, shopping mall advertising and power report monitoring.
With the continuous development of large-screen display technology, the high-definition and small-pitch digital LED large-screen display system has continuously entered the command center, dispatch center, performing arts center, conference center and other large-screen display occasions with more and more obvious technical advantages. The high-definition and small-pitch digital LED display system adopts pixel-level point control technology to realize the state control of the brightness, color reproduction and uniformity of the pixel unit of the display screen. From the current point of view, the high-definition digital LED display mainly includes P2.5 (pixel pitch 2.5mm). P2.0 (pixel pitch 2.0mm), P1.9 pixel pitch (1.9mm) and other products. The latest prototypes of P1.8 and P1.6 products have also been released, and the actual operation is also just around the corner (Editor's note: At present, P1.2 products have been put into practical use, and the minimum spacing of 0.7mm has been successfully developed). The large-screen display system has also entered a "seamless" era.
Third, the conclusion
The emergency command center should be positioned to integrate multiple data resources and integrate multiple business platforms to provide emergency decision makers with quick access to multi-party data and provide favorable business support for accurately and efficiently handling emergencies. The large-screen display system is used as the front-end display layer of the provincial government emergency command center access platform, emergency command platform and other business platforms. The display effect directly affects the display of the service platform functions, thus indirectly affecting the command and dispatch work. effectiveness. Based on this consideration, the large-screen display system should have a better overall display effect, and can divide multiple display areas to display different contents according to needs. If the project continues to use DLP, LCD and other conventional technologies, it means that the online line will be eliminated, the advanced nature of the construction of the command hall is not guaranteed, and its insurmountable seam problem will inevitably affect the display effect. Its functionality will also be affected.
Therefore, according to the comparison of the technical indicators of the large-screen display system at the present stage and the specific requirements of the comprehensive application of the emergency command work of the Provincial Communications Department, combined with the experience of investigation and exchange, it is found that the high-definition small-pitch digital LED display system is more suitable for the construction needs of the emergency command hall. .
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