Panorama of splicing screen accessories: distributor/matrix/processor/decoder selection and configuration logic

From distributors, matrices, processors to AI cameras and projectors, build a complete splicing screen system according to signal links, screen size and project tasks.

Spliced screen project problems, rarely because of the screen itself.More often, the fault lies in the place "outside the screen": multiple signals cannot be connected, the screen is black when switching, the monitoring screen cannot solve the code, the wall cannot be eaten until the bracket is installed, and the screen feeder cannot be connected in the customer network. The root of these problems is not that some accessories are wrong,There is no operable link between accessories. This article does not list accessories, but puts 10 accessories into the real system logic according to the order of "where the signal comes from, what it goes through, where it goes, who will install it and who is using it", and gives the method of deriving configuration according to screen number and signal source, budget proportion reference and cross-accessory compatibility verification list.

1. first look at a link: where is the signal from the source to the screen and where is the accessory?

The accessories of the LCD splicing screen system can be put into a clear link according to the signal flow direction and functional division of labor. Understanding this link is more important than remembering the parameters of each accessory individually.

In addition to this main link, there are three branch lines:

• Installation of structural branch line: The bracket/cabinet decides how to install, repair and bear the screen body. It is not on the signal link, but decides whether the project can fall to the ground.
• Content and Management Branch: The playback box solves the problem of "where the content comes from and how to update it". It is juxtaposed with the signal source and is usually connected to the matrix or processor.
• Interactive and intelligent branch: Infrared frame, AI camera and screen projection device change the large screen from "only looking" to "usable". They are respectively connected to the display layer, signal layer and processing layer.

2. Signal Processing Quadruple: Functional Boundaries and Substitution Relationships

Distributor, matrix, processor and decoder are the core of signal processing. Many schemes are misconfigured, not by choosing the wrong device, but by choosing the wrong device.There is no clear boundary between them, and "can be replaced" as "must be connected"。

Distributor: 1 way to multi-way, only solve the "copy"

The distributor copies all the input signals into multiple outputs, all of which are identical. Common specifications are 1 in 4 out, 1 in 8 out, 1 in 16 out, and can be expanded in multiple cascades.

When should I use it?: There is only one signal source, and all splicing screens display the same picture. For example, a play box in the store window drives 4 vertical screens, or a computer in the exhibition hall sends the same screen to 8 screens.

Procurement verification: input/output interface type (HDMI/DVI/DP); Whether the number of output paths covers the number of screens; Supported resolution and refresh rate; Whether cascading is required (for example, 18 screens can be cascaded with 1 minute, 41 minute, 16 minute); Whether audio separation or synchronization is supported.

Boundary: The distributor cannot switch signals, cannot splice pictures, and cannot open windows. As long as there are more than 2 signals that need to be "selected and displayed", the distributor is not enough.

Matrix: more in and more out, solving "switching"

The core value of the matrix is to switch any of the multiple inputs to any of the outputs.signal scheduling. Multiple computers in the conference room take turns to screen, different areas of the monitoring center take turns to patrol, and multiple playback sources in the exhibition hall switch, all rely on the matrix.

Must distinguish between "seamless" and "ordinary": When switching ordinary matrix, the output will appear 0.5-2 seconds of black screen, splash screen or picture tearing, because the signal link is directly disconnected and then connected. Seamless matrices must be selected for scenes that require switching experience, such as conference rooms, command centers, and exhibition halls. Ordinary matrices are only suitable for low-end scenes that are not sensitive to switching black screens, such as monitoring rounds and static images.

Procurement verification: Number of input/output paths; Interface type (HDMI/DVI/SDI/hybrid); Whether seamless switching; Control mode (panel/remote control/RS232/TCP/IP/API); Whether audio is switched or managed independently.

Processor: splicing, windowing, roaming, solving "layout"

The processor determines how to form a screen, how to open the window and how to cross the screen ". The essential difference between it and the matrix is that the matrix tube "which signal is sent to which screen" and the processor tube "how multiple screens cooperate to display a logical picture".

Centralized versus distributed selection logic: The traditional centralized processor concentrates all signals into one chassis for processing. Its advantages are non-compression, low delay, lossless image quality and pure hardware stability. The disadvantage is that expansion is limited by slots, all signal lines must be pulled to the chassis, and the risk of single point of failure is high. Suitable for small and medium-sized monitoring room, conference room, exhibition hall, signal source concentration, screen number is not many projects. Distributed systems distribute processing power to input/output nodes, through switch collaboration, flexible expansion, simple wiring (one network cable), single-node failure does not affect the overall situation. Suitable for large command centers, multi-floor or cross-regional projects.

Procurement verification: The maximum number of splicing rows and columns supported; The number of input/output paths; The upper limit of the number of windows opened; Whether to support cross-screen, roaming, zoom, picture-in-picture; Whether to support scene saving and one-key switching; Control interfaces and protocols.

Decoder: network flow on the wall, monitoring the scene of the "translator"

The decoder decodes the network video stream of the IP camera, NVR or platform into a video signal that the splicing screen can receive. It usually has a built-in matrix function and can be divided into single screens (4/9/16 screens), but it cannot replace the cross-screen splicing and windowing of the processor.

path number logic: The nominal "number of ways" of the decoder usually refersFull decoding capability(such as 64-way 1080P), but the actual project depends on the difference between "the number of ways displayed on the wall" and "the number of ways decoded at the same time. A practical estimation rule is: the ratio of monitors to cameras in key areas should be no less than 1:3, and in non-key areas, no less than 1:8. For example, 200 channels of monitoring and 60 channels of key points require a display capacity of about 20 screens at 1:3. The remaining 140 channels require about 18 screens at 1:8, totaling about 38 screens, and then convert the number of decoders according to the number of single-screen partitions (such as 9 partitions).

Procurement verification: decoding format (H.264/H.265); Protocol compatibility (GB28181-2022, ONVIF, RTSP); Maximum number of decoding paths and resolution per machine; Number and type of output interfaces; Whether multi-picture segmentation and splicing are supported; Whether docking with mainstream NVR/VMS platforms is supported.

The Substitution and Combination of the Four

3. installation structure: bracket and cabinet decide whether the project can fall to the ground.

No matter how well the screen body and signal system are selected, the installation structure is not established, and the project is on paper. The order of selection of the mounting structure is:Look at the wall first, then the maintenance method, and finally the expansion demand.。

Wall mount: the most space-saving, but "the wall has the final say"

Wall hanging is suitable for solid load-bearing walls (concrete, solid brick walls), conference rooms and exhibition areas where the screen body is not often replaced. The advantages are space saving and low cost. The disadvantage is that the rear maintenance is difficult, and the light steel keel partition wall and gypsum board wall cannot be hung directly, so it is necessary to reinforce the steel plate or change the landing scheme.

Front maintenance hydraulic support: wall-mounted front maintenance

The core value of the hydraulic support is "one piece can be replaced without removing the wall or moving the screen": the hydraulic rod drives the screen body to lean forward, and the maintenance personnel can disassemble and assemble the power supply and signal board standing on the front without reserving a back channel. Suitable for monitoring rooms, conference rooms and other wall installation and maintenance requirements of the scene. When selecting the type, look at three points: whether the load-bearing covers the weight of the screen body and leaves an allowance (a single screen usually weighs more than 10 to 20 kilograms); Whether to support up and down, left and right, front and rear three-way fine adjustment (for easy seam alignment, the adjustment amount is usually not less than 1cm); Whether damping and locking are convenient.

Floor cabinet/floor bracket: does not rely on wall load-bearing

The floor cabinet directly carries the weight of the whole screen body without wall load-bearing, and is suitable for projects with uncertain wall conditions such as command center, computer room, old building renovation, etc. The cabinet also has its own equipment position and routing space, which is convenient for centralized management of back-end equipment such as processors, matrices, decoders, etc. The disadvantage is that it occupies the ground space and has requirements for the flatness of the ground. It is not suitable to move frequently after fixing.

Selection of cabinetThe main point is different from the bracket: it focuses on the centralized management capabilities of the back-end equipment, including whether the height and depth of the cabinet accommodate the processor/matrix/decoder/NVR, cooling fan and ventilation design, strong and weak power separation wiring, PDU power distribution, Door lock and dustproof. The cabinet is not a "iron box", the heat dissipation and routing design is not in place, and the equipment failure rate will increase significantly.

4. Interaction and Intelligence: Four Accessories That Make Large Screens "Usable"

Infrared Frame: Add Touch to Splice Screen

The infrared frame is a customized accessory that adds touch capability to the ordinary splicing screen. The touch frame of the splicing screen needs to be customized according to the splicing combination (e.g. 55 inches 3 × 3, 46 inches 3 × 4). The touch area is customized according to the overall splicing length and width, and the number of touch points is usually 10 points.

Procurement verification: Adapted splicing size and combination method; Number of touch points; Touch accuracy and response speed; Whether it is compatible with the interactive software of the processor or playback box; Whether the thickness of the border affects the original border and installation of the splicing screen.

AI conference camera: tracking, box selection, split screen

The core functions of the AI camera in the meeting scene are automatic frame selection, voice tracking and speaker tracking, reducing the operation of manual lens adjustment. Some products support multi-screen and speaker focus, suitable for remote meetings and recording and broadcasting.

Procurement verification: resolution and frame rate; Tracking mode (voice/face/automatic frame selection); Interface (USB/HDMI/NDI/IP); Whether it is necessary to link with the conference terminal or processor; Whether the installation location and viewing range cover the main area of the conference room.

Play box: where does the content come from and how to update it

The play box solves the "content source" problem of advertising and display scenes. The key to selection is not hardware parameters,Content Management Methods: Local U disk playback, LAN release, cloud remote management, determine the later operating costs.

Procurement verification: operating system (Android/Windows/Linux); Whether remote publishing and scheduled playback are supported; Whether multi-screen synchronization is supported; Whether docking with CMS/DMS is supported; Storage capacity and network capability (wired/WiFi/4G/5G); Whether vertical screen output and splicing output are supported.

Screen Cast: How Personal Devices Connect to Large Screens

The screen caster is used frequently in conference and training scenarios, but it is also the most easy accessory to roll over in the "customer network environment. Enterprise-class screen prop needs to focus not only on resolution,Network compatibility, weak-network stability, and security policies: Whether to support 5G frequency band, whether to maintain stability at 10%-20% packet loss rate, whether to install software or administrator rights, whether to support screen code verification and encrypted transmission.

Procurement verification: Support Windows/macOS/Android/iOS; Wired/wireless/USB screen projection mode; Maximum number of devices connected at the same time; Whether to support multi-screen split screen; Screen delay; Whether an external network or a specific port is required; Available under customer VLAN and firewall policies.

5. Deduce Configuration by "Screen Number Source": Three Examples to Apply

The list of accessories cannot be written by feeling. The following three examples show the logic of deriving the accessory combination from "screen number" and "signal source". The actual project needs to be adjusted according to the interface type, distance and brand compatibility.

6. budget perspective: how much accessories, what to protect first, what to add later

If the selection of accessories is separated from the budget, it is easy to go to two extremes: either "all on the high end" leads to overspending, or "only buy the screen body" leads to the system not running. The common structure of an industry quote is:About 60% of the screen body, about 15% of the control system and auxiliary materials, and about 10% of the construction and commissioning., specifically due to brand, patchwork and project complexity. Hardware equipment costs (including screen body, processor, controller and signal transmission) usually account for 55%-65% of the total budget, installation and construction costs are about 10%-15%, cables and auxiliary materials are about 3%-5%, and brackets or cabinets are about 5%-8%.

Order of trade-offs when budgets are tight: First protect the bracket/cabinet and cable (safety and basic transmission), then protect the indispensable equipment on the signal link (monitoring decoder, multi-signal protection matrix, cross-screen saver processor), and finally consider interaction and intelligent accessories. Most infrared frames, AI cameras and screen-throwing devices can be installed later,The maintenance method of the support (before maintenance/after maintenance) and the space allowance of the cabinet must be determined in advance.The cost of later transformation is much higher than the equipment itself.

7. cross-accessory compatibility verification list: it is not a single device that is most likely to roll over.

Procurement verification by parts is the basis, but the most common failure in the project isInterface, protocol, or environment mismatch between accessories. The following list is recommended for confirmation item by item at the programme stage.

8. common configuration errors

• Misunderstanding 1: the more accessories, the more "professional".Do not duplicate those that can be combined in the link. A 1-way signal splitter is enough, and hard-adding matrices and processors will only increase the point of failure and budget.
• Myth 2: A matrix does not need a processor, and a processor does not need a matrix.Matrix tube "signal scheduling", the processor tube "screen layout". For multi-signal cross-screen projects, both are often required.
• Myth 3: Ordinary matrices are used in conference rooms or command centers.Ordinary matrix switching has a black screen of 0.5-2 seconds, which is unacceptable for meeting demonstration and command scheduling. These scenarios must be a seamless matrix.
• Misunderstanding 4: The number of decoder roads is directly bought according to the total number of cameras.The nominal number of channels of the decoder is the full decoding capability, which actually depends on the number of single-screen divisions, the number of channels displayed on the wall and the number of output interfaces. 200-way monitoring is not the same as requiring 200-way decoders.
• Misunderstanding 5: only look at the bracket load-bearing, do not look at the wall and maintenance methods.Light steel keel wall cannot be directly wall-mounted; The rear maintenance bracket needs a back channel, and the front maintenance hydraulic bracket must be selected for wall-to-wall installation.
• Misunderstanding 6: The screen projection device only looks at the resolution, not the customer network.VLAN isolation, firewall policies, and wireless AP frequency bands in enterprise networks may all make the screen-throwing device "not connected". Network compatibility and weak network stability should be confirmed before procurement.
• Misunderstanding 7: buy AI cameras as ordinary cameras.The AI function depends on the algorithm, computing power and deployment mode (local/cloud). You need to confirm the tracking mode, identification distance and linkage capability with the conference terminal, instead of just looking at pixels.

9. FAQ

10. Conclusion