Application advantages of seamless LED splicing screen in highway engineering

J@vier M@rceli

The total mileage of expressways in my country has exceeded 100,000 kilometers, ranking first in the world, and a high-speed driving network has been formed, which symbolizes the rapid development of my country’s economy. At the same time, the highway LED information release system has gradually entered the public’s field of vision and played its biggest role in the convenient, fast and safe driving of the highway. In order to meet the needs of the market, high-density LED display screens and seamless splicing screens have emerged as the times require, and have been applied in the field of transportation and highway engineering.

Three courses of seamless splicing technology development

From the perspective of its development process, seamless splicing technology has gone through three processes, namely, pure hardware fusion technology, pure software fusion technology and software and hardware fusion technology.

Pure hardware fusion technology mainly refers to the use of optical shading principles to fuse multiple images together. The software-only fusion technology uses electronic circuits to process images. The software-hardware fusion technology uses the above two technologies in combination, which includes both optical shading fusion technology and electronic fusion. Compared with the first two technologies, its display effect is relatively good. This is because the hardware fusion technology can solve the black balance problem in the image processing process, and the software fusion technology has a positive effect on the processing of the image white balance. The two technologies complement each other and can enhance the authenticity of the reproduced image.

In terms of splicing effect analysis, the seamless splicing technology has also gone through three processes, specifically hard edge splicing, overlapping splicing and soft edge fusion splicing. In the process of applying the hard-edge stitching technology, there are inevitably some seams, which lead to many deficiencies in the panoramic reproduction work; overlapping stitching specifically refers to: using two projectors to superimpose the projected images at the stitching place, so as to achieve overlapping effects. Compared with hard-edge splicing technology, this splicing technology has many advantages, but it also has certain limitations. This stitching method may cause overly bright areas on the display due to the excessive number of image overlays. As a result, it will adversely affect the application of seamless technology. Soft-edge fusion stitching is to use edge fusion technology to process images. This not only makes the two sides blend better, but also effectively prevents the generation of overly bright areas. In addition, the soft-edge fusion splicing technology has a relatively wide range of applications and can be used on planes, cylinders, and spheres. Highway seamless LED splicing technology makes full use of this advantage to provide guidance for the construction of highway projects.

Eight application advantages in highway engineering:

1. Completely solve the visual defect of splitting large-screen splicing images, and realize complete seamlessness

In specific work, the seamless LED splicing technology can completely solve the problem of screen segmentation and meet the requirements of complete seamlessness. Looking at the large-screen splicing system in my country at this stage, there are still many splicing seams in the work of many display screens. For example, in the LCD splicing system, the gap is too large to meet the needs of users. The plasma and rear projection large-screen splicing systems have more advantages than the liquid splicing technology. However, from the perspective of their visual effects, there are still a large number of dividing lines. Even if LCD, DLP, and PDP technologies are applied in the project, and the technical requirements are raised to the highest level, the gap can only be reduced, but cannot be completely eliminated. So far, the best level of patchwork technology is “seamless”, “narrowest”, “nearly seamless”, etc. However, this still cannot deny the existence of gaps.

The use of seamless LED splicing technology can improve the screen resolution in a small area, ensure the texture of the picture, and meet the needs of users for close viewing. Compared with the existing splicing technology, LED physical seamless splicing can realize cross-screen display. For the seam, the level of its level does not lie in the size of the gap, but the existence of the gap. Highway seamless LED technology adopts unique technology to connect each unit together and make up for the defects in the design process with special technology. In this way, the uniform distribution of the pixel pitch can be achieved, and the purpose of eliminating seams can be achieved.

2. Thoroughly solve the problem of inconsistency in splicing large screen brightness and chromaticity attenuation

The application of highway seamless LED technology will effectively handle the situation of different brightness and chromaticity attenuation of splicing large screen led (url) (url) screens. In this technology, point-by-point brightness and chromaticity correction technology is generally used, which ensures the uniformity of brightness and chromaticity. For example, the application of point control technology creates a platform for users to correct chromaticity and brightness point by point, and controls the pixels of the screen to achieve a high degree of image restoration. This technology also has SMS and E-mail reminder functions, which can allow users to grasp the status information of the splicing wall in a timely manner.

3. Intensive display and control platform handles all surveillance video sources

Seamless LED technology applies an intensive display and control platform to ensure the reliability of surveillance video sources. The intensive display and control platform can create a management platform for customers, and effectively realize the management of video signals, computer signals, and network signals, and provide users with better services.

4. Powerful redundant backup design for power supply and signal to ensure safe and reliable use

In the design of the seamless LED system, the redundancy of power supply and signal is backed up, which can reduce the occurrence of problems during its use. This is mainly reflected in the following aspects:

(1) Signal redundancy design control. In the highway seamless LED technology, the signal redundancy design adopts dual signal channels, and it is expressed as N+1 redundancy and supports hot swapping.

(2) Optimize the decentralized power supply design to centralized power supply, reduce the key heating parts of the screen body, and save energy more efficiently; the integrated power supply N+1 redundant design, intelligent current sharing when the power supply fails, and improves the safety of use. In addition, the power supply supports hot swapping, making maintenance simple and fast.

5. Ultra-long life, simple maintenance process, and ultra-low maintenance cost

Compared with ordinary display screens, LED has a longer service life, and its maintenance and repair costs are relatively low. Taking the seamless LED technology in a certain project as an example, the LED standard unit and the display panel are made up of smaller units (L2.5: 200*80mm/block-8.5 inches): the display pixels are individual LED lights Composition; if necrosis occurs, replace it with a spare unit and repair one LED light; if the panel is irreparable, replace a small display panel; take the 32-inch display area as an example, the area is only the traditional 4% of the panel. At present, the mainstream is 46-inch, 55-inch and 60-inch splicing units, and the proportional cost will be lower. In addition, in this case, the size of the DLP monitor in the seamless LED system is generally 50-100 inches, and the lifespan is about 8000h. If there is a problem with the projection bulb and panel, the LCD monitor needs to be replaced as a whole, and the size is generally 40 to 100 inches. The glass panel breaks easily and needs to be replaced as a whole.

6. Super large viewing angle, super high contrast, super high refresh rate

The project provides a larger viewing angle and prevents the occurrence of reflections. Based on the analysis of the above engineering case, it uses a matte black bottom panel and a black lamp bead surface, which breaks through the limitations of traditional screen reflections. The contrast ratio is as high as 4000:1, and the color expression is better. In addition, its fill rate and contrast ratio are also very high. When taking pictures, the state is relatively stable, and when dealing with dynamic display pictures, the edges of the images are clear, with good dynamic expressiveness, and the image information is accurately and truly restored. Make the video picture delicate and smooth, bring the greatest visual enjoyment. In addition, it is particularly pointed out that the brightness uniformity of the LED screen is excellent, and with the single-point brightness correction, the brightness uniformity of the entire screen tends to the extreme.

7. Ultra-thin, ultra-light structure, ultra-quiet heat dissipation technology

In the application process of seamless LED splicing technology, ultra-quiet heat dissipation treatment technology is also adopted. The engineering case I studied mainly uses high-performance heat-conducting material aluminum plate for overall heat dissipation, and the left and right wings of the unit shell take away the heat in the box through convection grooves, which is conducive to maintaining the same temperature as the environment. The large-area aluminum heat dissipation surface on the back of the box is an attached heat sink for circuits and ICs. The good self-heating design and convection scheme ensure that the product is ultra-quiet and has strong heat dissipation.

8. Dynamic energy saving, ultra-low power consumption, green light source, energy saving and environmental protection, no pollution

(1) Low power consumption and energy saving technology

When the LED high-definition display wall is working, different power consumption will be generated with the change of the picture; that is, it is equivalent to a part of the peak power consumption, generally between 30% and 50%; there are differences depending on the display content; traditional splicing large screens When working, no matter what the screen content is, even if the screen is black, it still maintains a constant power consumption, that is, the required power.

(2) Energy saving and environmental protection, non-polluting products

Pollution-free traditional splicing large screens have various environmental pollution sources such as mercury, ultraviolet rays, and auxiliary radiation due to their luminescent materials and working principles. The LED high-definition display directly emits light to display products. The LCD light source is a backlight bulb (tube), and its light-emitting medium is mostly tungsten, lead, etc., which has no significant impact on the environment.

In the process of highway construction, the seamless LED splicing technology is used to make the picture of the entire screen very clear, and the viewing angle is relatively large, which is very beneficial to engineering construction.

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