In the professional field, the popularity of electronics and digital operating systems has made users increasingly demanding high-definition, large-size image displays, and they are gradually being replaced by large-screen splicing display systems. In addition, it is also widely used in telecommunication network management, public security traffic police command, traffic monitoring management, military command training, industrial production dispatching and other control rooms. It can display RGB, video and a variety of different colors. The internet. The signal of the signal source meets the needs of users to display various shared information and comprehensive information on a large scale.
Moreover, different types of LCD splicing walls also have different advantages, but also have their own specific demand environment. Therefore, with the development of product development and application, the future development of LCD splicing walls is closely related to the application.
With the development trend of the times, various splicing methods are embedded
Currently, LCD splicing walls on the market basically have three different splicing methods. One is PCI card type; the other is external drag and splicing controller mode; the third is embedded.
The working principle of the PCI card type is to divide the complete video image into mХn sub-video signals through an industrial computer using a multi-screen splicing card, and then send the sub-video signals to the corresponding corresponding units on the splicing screen. wall. To achieve the purpose of large-screen splicing display. However, due to the limited computing power of industrial computers, the best industrial computers can only achieve 4Х4 splicing, which limits the number of splicing units.
The external drag splicing controller can also be called a large-screen display splicer or video wall controller. The main function of the video wall splicer is to divide the complete image signal into N blocks and assign them to N video display units (such as Back). The unit is activated, and the large screen is composed of multiple ordinary video units.
It can support simultaneous access of multiple video devices to meet the functional requirements of LCD video walls. "The reason why it is called external drag is that this splicing curtain wall is divided into two independent parts, one part is the display part, which can be composed of ordinary large-screen splicing display units, such as LCD splicing screen; 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 can display a picture.
The working principle of the embedded LCD splicing wall is that each splicing unit has an independent video processing module, the complete signal is transmitted to each unit through the matrix, and each splicing unit performs video processing, and the part that should be displayed is segmentation. After this part of the signal is amplified, it shows the purpose of large-screen splicing display. Since it is a separate process, the number of splicing units can theoretically be unlimited.
From the above simple principle analysis, the basic difference between PCI card splicing and embedded splicing is that after the former splits the mother signal, each sub-signal must be amplified, and the latter only executes the part that should be displayed. The magnification process causes the former to have a large amount of calculation, and the resolution is determined by the computer and the corresponding PCI card; the latter has a small amount of calculation, and the resolution is determined by the embedded processing module itself.
