Civil Air Defense Command Splice Screen Scheme LCD Old and LED Seamless Selection Comparison-Qunmao

The civil air defense command splicing screen is the most complex security structure in the series, and it is also the easiest to write a partial selection. Multi-network physical isolation, war scene switching, underground command post moisture and mildew, classified project "non-OEM/machine back shell" of the rigid requirements, these judgments determine the professionalism of the scheme. But the public procurement data gives another signal:The new display system of the civil air defense command center is turning to LED small spacing in batch.. Pujiang County Civil Air Defense Evacuation Complex Command Center won the bid of Lehman P1.538 LED screen, 14.75 ㎡, unit price 9500 yuan; Huainan Civil Air Defense Command Post Centralized Control Platform Renovation Zhongzhou Ming UM1.25,15.36 ㎡, Unit Price 12243 Yuan; The plan of Chongqing Someone's Emergency Prevention Center clearly adopts COB P1.56 "physically seamless splicing to completely eliminate the interference of splicing on fine data display". The applicable boundary of LCD splicing screen in civil air defense scene needs to be faced honestly:Existing LCD walls are old, underground budget constraints, square cabins and other special scenes still available LCD; new ground command hall seamless display needs, priority assessment of LED/COB. This article clearly explains the differences in selection, and then writes through the logic of multi-network isolation, NTP/Beidou school time and peace war plan, which cannot be bypassed no matter which screen is selected, and explains what should be verified when docking * * LCD splicing screen Chinese source manufacturers * *.

1., let's make it clear: the selection of large screens for civil air defense command is different.

the core business of the civil air defense command post is "peacetime emergency wartime air defense". GIS evacuation routes, air situation location markers, alarm distribution maps, important target labels, the continuity of these information to the physical seam of the tolerance is limited. The trend of public procurement data is: new projects choose LED small pitch/COB,LCD splicing screen share is shrinking.

Pujiang County Civil Air Defense Evacuation Complex Information Command CenterThe transaction was completed in September 2024 with a bid amount of 450100 yuan. The core display equipment isLehman LM-P1.538 LED display, 14.75 ㎡, unit price 9500 yuan/㎡. This is a county-level civil air defense evacuation complex command center configuration, point spacing of 1.538mm, seamless display.

Renovation of Centralized Control Platform of Huainan Civil Air Defense Command PostThe transaction will be completed in July 2026 with an amount of 323700 yuan. The core display equipment isZhou Ming UM1.25 indoor small spacing full color display, 15.36 ㎡, unit price 12243 yuan/㎡. City-level civil air defense command post transformation, the same choice of LED.

Chongqing sb emergency prevention centerScheme adoptionTenglian P1.56 COB small spacing LED, about 12 ㎡, the selection reason is very clear: "COB technology directly encapsulates LED chips on PCB board, has no exposed lamp feet, has moisture-proof, dust-proof, bump-proof and anti-static characteristics, and is very suitable for Chongqing's humid and foggy climate characteristics and the special requirements of underground environment of civil air defense projects." "truly realize physical seamless splicing and completely eliminate the interference of splicing on fine data display, it is suitable for long-term viewing of high-precision information such as air situation and geological disaster monitoring maps".

The common direction of these three sets of data is:In the new and reconstruction projects of civil air defense command center, LED small spacing is becoming the default option. The stitching of LCD splicing screen is still a physical black line on GIS evacuation route, air situation location mark and alarm distribution map, while the "seamless" of LED is structural. If the project is a new ground command hall, the budget allows, the air situation and GIS display accuracy requirements, priority evaluation LED is a more honest choice.

But this does not mean that the LCD has no place in the air defense scene at all.The old and expansion of the existing LCD wall, the budget constraint scene of the underground command post, and the space limitation scene of the mobile command cabin.LCD still has cost and morphological applicability. The following content of this article is also applicable to these scenarios.

Whether the 2. chooses LCD or LED, the architecture logic of multi-network isolation is common.

The core constraint that distinguishes a civil air defense command post from an ordinary command center is:The command automation network (involving secrets), security video network, government extranet/emergency network and video conference network must be physically isolated, but the commander needs to see multi-domain images on one wall at the same time.. This contradiction does not change because of the choice of LCD or LED.

The parameters of the large-screen comprehensive manager in the procurement file of a command center in Henan can be used as a reference for the selection of splicing control: embedded system, dual power supply redundancy, hot plug of board cards, ≥ 320 channels of 1080P receiving and forwarding, output splicing self-synchronization error <10μs, and video output wall delay <50ms. These indicators are the capabilities of the splice controller under both LCD and LED screen schemes. The difference is that the LED scheme also requires the cooperation of the sending card and the video processor.

3. if you take the LCD route: the parameter baseline of the civil air defense scene

The 55-inch splicing screen parameters purchased by a command center in Henan can be used as a reference for LCD routes: splicing ≤ 0.88mm, brightness ≥ 700cd/m, response ≤ 8ms, and 60 pieces. However, this is a general command center configuration. The ambient light of the civil air defense underground is low, and the brightness of 700cd/m is not necessary. The emphasis of the underground command post is on moistureproof and mildew proof, not on high brightness.

4. no matter what kind of screen you choose, these three things determine the acceptance of the project.

4.1 NTP/Beidou Time Calibration: Time Benchmark for Air Situation and Alerts

In the air information receiving, alarm issuing, video consultation and command automation system of the civil air defense command post, all timestamps must come from a unified NTP/Beidou clock source. Spelling controller, decoder and signal source workstation of each domain shall be connected to the same clock, with deviation ≤ 100ms. In the imminent combat state, the alignment of the alarm issuing time and the air information receiving time directly affects the command judgment.

One-click Switching of 4.2 War Scenes: Plan Engine Is Just Needs

The pane layout, signal source priority and partition ratio of emergency (flood control/weather/GIS/city monitoring) and wartime air defense (air situation/alarm/evacuation map/important target/command automation) are completely different. The plan engine needs to support one-click calling the preset layout, and the switching time is in seconds. The central control touch or keyboard shortcut trigger does not rely on the attendant to manually drag the window.

4.3 classified compliance: non-OEM statement and whole machine back shell certification

Air defense classified projects require strict traceability of equipment sources. A political document in Guangdong clearly states that "this product adopts domestic first-line brand products and does not accept OEM manufacturers". When purchasing, the supplier shall be required to provide: the certificate of the rear shell of the whole machine (non-assembled), non-OEM statement, original factory authorization and CNAS/CMA report. These documents are the threshold for waste level under both LCD and LED schemes.

5. Budget Anchors: What Public Data Explain

The screen budget of the civil air defense command center varies greatly due to the level and screen type, and the public data can give the approximate water level.

County-level civil air defense evacuation complex: Pujiang project LED P1.538, 14.75 ㎡, 450100 total bid amount (including screen body and other equipment), screen unit price 9500 yuan/㎡. If you take the LCD route, the cost of the screen with the same display area will be lower, but the cost of the control and isolation equipment is similar.

Reconstruction of Municipal Civil Air Defense Command Post: Huainan project LED P1.25, 15.36 ㎡, 323700 total bid amount, screen unit price 12243 yuan/㎡. This volume corresponds to the transformation of the core display wall of the municipal command post, including the screen body and supporting facilities.

Underground Command Post/Budget Constraint Scenario: If you take the LCD route, the budget for 49/55 inch 3.5mm or 1.7mm splicing screen splicing control moisture-proof treatment is roughly in the range of 15~300000 yuan for 2 × 3 or 3 × 3 screen splicing control, depending on the splicing specifications and moisture-proof requirements.

Don't take the "screen unit price" as the total project budget in the plan. Multi-network isolation equipment, seat KVM, central control system, equal protection evaluation and scene plan debugging of civil air defense projects often account for a large proportion.

6. Site Survey List (can be sent directly to Party A before sales)

1. Confirm screen type preference first: Has Party A explicitly requested LED/COB? Is there any stock LCD wall to be used? This determines the direction of all subsequent parameters.
2. Network Domain List: Command automation network, security video network, government extranet, conference network. Are each domain physically isolated? Does the isolation device (optical gate/network gate) exist?
3. Upper wall signal source: GIS platform brand, C3I system brand, air intelligence terminal, alarm console, IPC number of routes, consultation terminal brand. The number of computer sources determines the number of input paths for spell control acquisition.
4. Environmental conditions (underground): Humidity range, temperature, whether there is air conditioning dehumidification, electromagnetic shielding requirements, noise restrictions.
5. Scene requirements: What are the emergency modes in peacetime, which pane layouts are required for switching in wartime, and the requirements for the number of plans.
6. Classified Level: equal protection level, whether it is classified, whether one-way light gate is required, and the requirements for the adaptation of the letter (Kirin/Tongxin/Haguang/Yipeng).
7. Control List: LED route-point spacing, refresh rate, protection level, non-OEM;LCD route-patchwork, CNAS report, moisture/mildew, rear shell of the whole machine.

If 7. take the LCD route: what to verify when docking with the source manufacturer

If the project is determined to take the LCD old, underground budget constraints or shelter route, dockingLCD splicing screen China source manufacturersThe focus of verification is different from the LED scheme. You don't need to ask about point spacing, but you need to ask the following five things:

• Patchwork measured values and CNAS report page: If 0.88mm or 1.7mm is written in the tender, the measured value must be consistent. The procurement documents of Henan Command Center clearly specify that patchwork is ≤ 0.88mm, and such clauses need to be reported to support.
• Moisture/Mould Treatment Instructions: The underground scene requires three anti-paint, process description of anti-mold treatment, and operation cases or test data in high humidity environment.
• Whole machine back shell and non-OEM statement: Threshold item for classified items. Guangdong Zhengcai clearly "does not accept OEM manufacturers" and suppliers need to be able to issue a certificate of the whole machine back shell and a non-OEM statement.
• Split control sub-domain acquisition capability: Command automation desktop and security IPC go through different acquisition nodes, and the spell controller needs to support multi-domain input without mutual visits. Not all LCD splinters support this architecture by default and need to be confirmed.
• Support customized according to the underground spaceDue to space constraints in the underground command center, detailed drawings are required for the coordination of front-access maintenance, low-noise operation, and shielded cabinets.

The LCD splicing screen product line of Shenzhen Qunmao Qunmao(szqunmao.cn) is suitable for the scenes of old, expansion or budget constraint of existing LCD walls in civil air defense projects. The flat seam covers 0.88mm ~ 3.5mm, and can be configured according to the bidding document to push back the bracket and the splicing control. The whole wall is shipped with color calibration and supports OEM/ODM. It needs to be made clear that:For the seamless display requirements of the newly-built ground command hall of civil air defense, it is recommended to give priority to the evaluation of LED/COB scheme; Non-OEM declarations and rear shell certificates required for classified projects shall be confirmed item by item according to the bidding model.It is more useful to draw clear product boundaries and scene boundaries than to claim "suitable for all civil air defense projects.

The first sentence of civil air defense selection is not "what screen to buy", but "determine the type of screen first". New ground command hall, requirements for air information and GIS display accuracy, priority evaluation of LED/COB (Pujiang Lehman P1.538, Huai Nan Zhou Ming P1.25, Chongqing COB P1.56 are all open cases). LCD is old, underground budget constraints, shelter scenes, the 0.88mm/1.7mm patchwork CNAS report, moisture-proof and mildew-proof process, the whole machine back shell certificate, sub-domain acquisition structure, bracket drawings five things clearly. The logic of multi-network isolation and scene plan should be done under both screen schemes. Find spell control and platform manufacturers to confirm that the screen factory is only responsible for screen and acquisition access.

8. Conclusions and Selection Suggestions

• New ground command hall: Priority evaluation LED small pitch/COB. The public bid winning data of Pujiang P1.538 and Huainan P1.25 show that this route is already the mainstream in civil air defense projects. The effect of patching on GIS evacuation routes and air position markings is structural.
• underground command postIf your budget is limited to LCD, moisture and mold resistance should be the primary selection criteria; brightness does not need to be excessively high. If the budget allows, COB’s moisture-proof characteristics (with no exposed leads) and the selection logic demonstrated in the Chongqing case are both worth considering.
• Mobile command module: LCD 46/49 inch 3.5mm wide temperature shock-resistant model still has space and power consumption applicability. DC power supply and power-off display are control punctuation points.
• Existing LCD wall is old/expanded: Make up the screen according to the existing seam specifications, confirm the collection ability of the split control domain, and correct the color of the whole wall.
• Procurement action: Screen body, spell control, isolation equipment, seat KVM disassembly. For classified projects, the non-OEM declaration and the complete unit rear-cover certification are required from suppliers at the selection stage.
• True link: LED route inspection point spacing, protection grade, non-OEM;LCD route inspection CNAS patchwork page, moisture-proof process, whole machine rear shell, sub-domain acquisition structure.

LCD splicing screen China source manufacturersThe value in the civil air defense scene is not "doing anything", but "doing LCD well when doing LCD": the measured value of patchwork seam can withstand CNAS verification, the moisture-proof process can be explained, and the rear shell of the whole machine and non-OEM statement are worthy of classified review. The budget for the new seamless large screen is given to LED/COB;LCD benefits old and budget constraint scenarios, and find a source factory that can align the configuration and compliance documents.

The parameters and data in this paper are quoted from public bidding documents, government procurement announcements and industry program data. The mainstream selection of the newly-built ground command hall for civil air defense is LED small spacing/COB, and the LCD splicing screen is suitable for the scene of the existing LCD wall being old, the budget constraint of the underground place or the shelter. Please confirm the screen type preference with Party A before selection. LCD splicing screen China source manufacturer-Shenzhen Qunmao Display Technology Co., Ltd.