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In today's economic globalization and the era of information explosion, people are increasingly demanding the display of various information in their daily work and life, and the requirements for the way information is presented are increasingly diversified. This greatly promotes the application of large screen splicing walls. Simply put, the large screen splicing wall is an integrated display system, which is commonly used in projection and LED. Among them, projections are currently commonly used in LCD, DLP and LCOS technologies. The price of the splicing wall using projection technology is relatively low, and the quality and stability of the picture are relatively high, so the cost performance is the highest, which is the mainstream product in the field of splicing walls. Although LED splicing walls are relatively expensive, they are widely used for outdoor digital display because of their resistance to the sun and wind and rain. In addition, there are LCD liquid crystal and PDP plasma technology.

Mr. Zhao Handing, secretary-general of the large-screen projection display branch of the China Electronics Video Industry Association, said, “The splicing wall is not optional, but can greatly improve work efficiency. For example, in the public transportation dispatching department, the use of LCD splicing walls can simultaneously A lot of pictures are displayed, so that the traffic conditions of each road section are clear at a glance, which is convenient for command and dispatch. It can be seen that the splicing wall plays an important role in large departments and places such as command and dispatch.

At present, large-screen splicing systems have been widely used in exhibition halls, sports venues, news centers, TV studios, meteorological stations, railway stations, airports, entertainment plazas, military operations command centers, traffic command systems, public security 110 command systems, power dispatching, Flood control scheduling, shopping centers, banks, outdoor advertising, etc. Due to the different conditions in each industry, the application methods have their own characteristics. In addition, different types of splicing walls also have their own different advantages, but also have their own specific needs environment. Therefore, the development of the application is accompanied by the development of the product, and the development of the future splicing wall is closely related to the application.

Diversified development  

Various types of splicing walls are different techniques in the competition. It can be seen that in the small size monitoring aspect, the LCD liquid crystal splicing wall will become the mainstream in the future, and the DLP of the large size is still the future development direction.

Although DLP rear-projection splicing walls have the defects of large size and short life, they still occupy the current main market due to their small joints and good visual effects. In addition, DLP has developed for a long time, and the promotion range is also large. Although some drawbacks are exposed during the wide-scale use process, DLP manufacturers are gradually improving the technology, making DLP cabinets bigger and thinner, and making seams at the same time. Smaller, thus achieving picture integration.

DLP occupies half of the country, LCD is a rising star. The display unit of the splicing system can be divided into many types according to its working principle. Commonly used are: CRT (cathode ray tube), LCD (liquid crystal), PDP (plasma), DLP (rear projection) and the like. Throughout the current situation of the display unit, the CRT has gone from the smash hit to the end, and has already become a bright yellow flower; the DLP rear projection splicing system is currently the mainstream product, occupying more than half of the country; the LCD, which is a rising star, has developed rapidly in recent years.

The development of technology and the improvement of demand have made CRT unable to meet the needs of users, and have basically withdrawn from the market. DLP has the characteristics of image clarity, brightness, color and viewing angle, and is still the most widely used technology in the market. In addition, since the DLP splicing curtain wall uses a projection method, the splicing gap can be made small (3-5 mm), but due to the unevenness of the brightness of the picture, the brightness of the whole picture at the splicing edge is low, and each unit The brightness of the central part is high, so it also affects the perception of the spliced curtain wall to a certain extent.

LCD splicing curtain wall adopts LCD screen as splicing unit. It is a curtain wall technology that emerges after CRT curtain wall, DLP curtain wall and PDP curtain wall. It has a service life of up to 50,000 to 80,000 hours, stable quality and low maintenance cost. There is no strict requirement for patchwork, and LCD can be regarded as the most cost-effective curtain wall. From the current domestic and international use situation, all high-end curtain wall systems have adopted LCD splicing curtain wall. With the further maturity of technology, the future market of LCD curtain wall is very promising.

The future video wall will also be networked, and the functions will be further enhanced. It can not only display the terminal, but also add some useful functions to add value. The most important thing is to achieve household consumption.

More complete and perfect

A perfect picture always gives an extraordinary vision. At present, no matter whether it is a large-scale rear projection large-screen splicing or a liquid crystal splicing system, the gap between the screens cannot always satisfy people. At present, most of the large-scale rear-projection splicing display systems are stitched and spliced, and there is no seamless splicing system in the true sense. In addition, there are few manufacturers that can achieve multiple columns and multiple rows; therefore, how to achieve real meaning The large-scale rear projection splicing display system seamlessly splicing, and the splicing system picture is more complete and perfect is still the pursuit of the manufacturers.

At present, a seamless edge splicing display technology is gradually becoming a solution to this pursuit. It is reported that the fusion screen uses the entire screen to eliminate the physical gap between the screens of the traditional stitching, so that the screen display image remains intact.

With the wider application of large-screen splicing walls, the splicing technology is constantly improving. However, due to the insufficient bandwidth of the PCI bus, it has become a key issue that has plagued the development of the large-screen splicing system in a large-scale direction. Taking the system of 81 display units as an example to analyze the bottleneck problem of PCI bus bandwidth: After calculation, it takes 1.84 seconds to transfer from memory to PCI and display one frame of image (243M data), but the actual operation time Other software influences, device interruptions, hard disk access speeds, and memory counts often increase the image data transfer time or cause unacceptable jitter effects when transferring image data. It can be seen that due to the limitation of PCI bus bandwidth, the traditional processor can not complete the ability to drive 81 displays normally.

Embedded stitching is the trend of the times

At present, the large-screen splicing wall on the market basically has three different splicing methods: one is a PCI card type; the other is an external drag splicing controller mode; the third is embedded.

The working principle of the PCI card type is to divide a complete video image into MХN sub-video signals by using a multi-screen splicing card through an industrial computer, and then transmit the sub-video signals to respective corresponding units on the splicing wall. Achieve the purpose of large screen display. However, due to the limited computing power of the industrial computer, the best industrial computer can only achieve 4Х4 splicing, which limits the number of splicing units.

The external drag splicing controller can also be called a large screen splicer, a video wall controller or a video wall splicer. Its main function is to divide a complete image signal into N blocks and assign them to N video display units (such as rear projection). Unit), completes a large screen with multiple common video units. It can support simultaneous access of multiple video devices to meet the functional requirements of the splicing curtain wall. It is called external drag because the splicing curtain wall is divided into two separate parts, one part is the display part, which can be composed of a common rear projection unit such as a rear projection television set; the other part is this splicing controller. Its function is to realize the combination of multiple physical outputs into a resolution superimposed display output, so that the screen displays a picture.

This splicing controller can be implemented in different ways. It can be embedded or plug-in, or both. Simply put, it is like a picture splitter, but it is only enlarged and divided, so it is generally easy to install, the wiring is relatively simple, and there are no advantages such as many modular devices; but the disadvantages are also obvious, for example, once When a certain road fails, it is difficult to overhaul; the hue between the units, the phase of the line, etc. are difficult to adjust, and the image quality is poor.

The working principle of the embedded splicing curtain wall is that each splicing unit has an independent video processing module, and the complete signal is transmitted to each unit through the matrix, and each of them performs video processing, and the part which should be displayed is segmented, and this part of the signal is amplified. After the display, the purpose of the large screen mosaic display is achieved. Since it is a separate process, the number of spliced cells can theoretically be infinite.

Therefore, the basic difference between the PCI card-type splicing and the embedded splicing is that after the former splits the mother signal, each sub-signal must be amplified, and the latter only enlarges the part that should be displayed, so the former The amount of computation is large, and the resolution is determined by the computer and the corresponding PCI card; the latter is small in computation and the resolution is determined by its own embedded processing module.

In addition, the features of embedded stitching include:

Easy to use: Since its software is specifically developed for the product, users can generally use it without training.

High system stability: It will not be interfered by various viruses from the network or computer system, because its software is solidified in FLASH and cannot be changed.

The system starts fast: non-embedded systems are usually built on Unix or WINDOWS to achieve its functions, so the system must start these before you can run the splicing program, the whole machine starts much slower.

Low cost: embedded system software must be developed by itself, non-embedded systems need to buy WINDOWS and other operating systems, the price is not expensive

Small size and compact structure: Because embedded splicing has these advantages, although the current application on the market is still based on the more traditional PCI card splicing, there are more manufacturers in this area, but the future will still be Development towards embedded stitching.

In response to this problem, some manufacturers have proposed some solutions:

Distributed master-slave processor architecture

System with distributed master-slave processor technology, with full-screen high-resolution single-screen display capability and multi-user flexible partitioning application, enabling fast synchronization display for single logic screen applications or partition applications . At present, the rear projection splicing display system adopting the technology has a maximum resolution of 100 M pixels (100 million pixels) or more, and the display speed is equivalent to the display speed of an ordinary 16-channel multi-screen processor system.

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