Comparison of Seamless Selection between LCD and COB in Spliced Screen Scheme for Meteorological and Earthquake Monitoring-Qunmao

The large weather/earthquake monitoring screen is the only one in the series that needs to discuss "what screen to choose" and then "how to match. Radar echo color scale, satellite cloud image boundary, seismic waveform main trace, GIS epicenter symbol, the continuity of these data to the physical seam tolerance is very low. Data from public projects in the last two years give a clear signal:A meteorological warning center in Fujian uses Lehman P0.7 COB "the picture is fine and seamless", Hefei meteorological uses Hida P0.9 COB "the whole screen is seamless", and Shenzhen Meteorological Bureau also has COB application records.. Even if the LCD splicing screen is 1.8mm, the splicing is still structurally defective on the waveform and cloud map. This article honestly deals with this selection disagreement:New seamless large screen gives priority to COB/LED evaluation; LCD splicing screen is suitable for existing LCD wall usage or budget constraint scenarios.. No matter which screen is selected, the logic of decoding accounting, NTP/Beidou timing and scene plan is common. What should be verified when docking * * LCD splicing screen China source manufacturer * * is also explained in the article.

1.'s make it clear: the weather/earthquake screen is shifting from LCD to COB seamless screen.

This is not speculation, it is the trend of public procurement data.

A Meteorological Warning Center in FujianThe display system to be put into use in 2026 adopts Lehman cold screen master P0.7 COB product, and the report clearly reads"0.7mm ultra-small point spacing to achieve fine picture without patchworkThe color is realistic and can accurately present meteorological details such as cloud structure, precipitation intensity and typhoon path ". The reason for selection directly points to the interpretation requirements of meteorological data: patchwork will cut off the cloud map and echo, affecting the forecast analysis.

Hefei Meteorological Monitoring and Early Warning and Scientific Research CenterTwo sets of P0.9 COB large screens of Hida Electronics are adopted, with an area of 30.1 ㎡ and 46.2 ㎡ respectively, for meteorological emergency command center and comprehensive business center. COB's "full-screen seamless" feature enables radar maps, satellite cloud maps, and multi-task modules to be linked with the screen without being interfered by dividing lines.

Shenzhen Meteorological BureauThere are also application records of COB ultra high definition display products. Lehman Optoelectronics's public information shows that its COB products have been applied to scenes such as the Shenzhen Meteorological Bureau, indicating that the meteorological department's demand for seamless display is not an isolated case.

The underlying logic of this trend is simple:Meteorological/seismic data is a continuous field, not a discrete monitoring picture. The color scale transition of radar reflectivity, the continuous curve of seismic waveform, and the spatial relationship between the epicenter and the fault zone on GIS all require the picture not to be cut off physically. Even if the stitching of the LCD splicing screen is 1.8mm, it is still a black line at the position of the waveform main trace or the typhoon eye. For scenarios that require "interpretation" rather than just "viewing", this difference is structural.

Therefore, the positioning of this article is:If you are building a new weather/earthquake command screen, give priority to evaluating the COB/LED seamless scheme. If you are facing a scenario where the existing LCD splicing wall is old, expanded, or the budget is really limited, the following contents on decoding accounting, time correction and scene plan are still applicable.Not to push the LCD hard to a seam sensitive scene is what distinguishes this article from soft text.

If LCD is selected for 2.: the parameter baseline shall be subject to the administrative documents.

A procurement document of Zhenjiang Meteorological Conference System gives the reference parameters of LCD splicing unit in meteorological scenarios: 55 inches, bilateral physical stitching1.8mmBrightness ≥ 500cd/m, contrast 1400:1, physical resolution 1920 × 1080, response ≤ 8ms, 24 hours of continuous operation, service life of more than 60000 hours. A meteorological early warning display system in Henan also requires 55 inches, seam ≤ 1.8mm, brightness ≥ 500CD/m, contrast ≥ 4000:1, horizontal and vertical viewing angle ≥ 178, and clearly requires CNAS test report.

If LCD is selected, 1.8mm is the patchwork specification appearing in the meteorological administration documents, not 0.88mm. This means that even within the LCD scheme, the patchwork requirements of weather scenes are not a "smaller is better" competition, but a balance between budget and acceptability. 3.5mm is also acceptable in the conference hall or duty room with a sight distance of more than 2 meters.

3. if COB/LED is selected: control punctuation is completely different from LCD

The core parameter of the COB scheme is not patchwork (because there is no patchwork),Point spacing, protection level, color consistency and heat dissipation。

Point spacing: Meteorological command center commonly used P0.9 ~ P1.2 level. P0.7 for the Fujian project and P0.9 for the Hefei project. The smaller the dot spacing, the less grainy the closer you look, but the cost goes up. The sight distance of the command center is usually 2~3 meters, P1.0 ~ P1.2 can be satisfied, and P0.7 ~ P0.9 is a higher-end configuration.

Protection level: The COB large screen frontal protection of Hida Hefei Project reachesIP65, Anti-collision, anti-shock, moisture-proof, dust-proof, anti-static, anti-salt spray. Weather/Seismic Command Centers, while not as exposed to salt spray as ports, are of value for moisture and dust protection in southern forested areas or coastal stations.

Heat dissipation and power consumption: The operating temperature of the cold screen master series of Lehman Fujian project is stable at 29.5 ℃, and the power consumption is 50% lower than that of the traditional scheme. For the duty room with 7 × 24 operation, heat dissipation and electricity cost are not negligible parts of TCO.

color consistency: COB's point-by-point adjustable feature makes its entire screen uniformity better than LCD splicing walls. A comparative data of display technology pointed out that the small-pitch LED "brightness and color are adjustable point by point, and the whole screen is uniform", while the LCD splicing wall "is used for a long time, the brightness and color attenuation between unit screens are inconsistent and cannot be restored". The interpretation of color scale of weather radar requires high color consistency, which is the structural advantage of COB in meteorological scenes.

4. no matter which screen you choose, these three things determine the success or failure of the project.

4.1 control and decoding: computer sources cannot be plugged into IPC decoders

Most of the sources of meteorological/seismic large screens areComputer SourceRadar display workstation, satellite cloud image workstation, numerical prediction model desktop, seismic waveform analysis software, GIS server. These are not RTSP video streams and cannot be fed into the IPC decoder. The spell controller needs to haveDP/HDMI Capability, directly collect the desktop signal of the workstation without transcoding or compression. IPC decoding is only used for video surveillance around the observation field or station.

The spell control requirements of Henan meteorological early warning project can be used as a reference: pure hardware structure, no CPU, 12 HDMI input and output, startup time <5 seconds, seamless switching <20ms, and maximum access to 256 signal sources. These metrics address the needs of mixed scheduling of computer and video sources.

4.2 NTP/Beidou Time Calibration: Bottom Line of Waveform Timeline

In seismic waveform analysis, the time error of P/S seismic phase pickup directly affects the magnitude and positioning accuracy. The timeline of all waveform windows must come from a unified NTP/Beidou clock source and cannot rely on the local RTC of the splicing controller or workstation. The timestamps of weather radar echoes also need to be unified, otherwise time misalignment will occur when multiple radar puzzles and satellite cloud images are superimposed.

When purchasing, it should be written in the standard control file: the spreader, decoder and all signal source workstations are connected to the same NTP server or Beidou time service source, and the time deviation is less than or equal to 100ms. This is not a plus term, is the premise of seismic waveform analysis.

4.3 scenario plan: second-level switching of typhoon/rainstorm/quick report

The rhythm of meteorological/seismic duty is "daily round-trip event-driven". Before typhoon landing, it needs to be switched to "typhoon mode" (path wind field cloud map coastal station wind top), and after earthquake quick report is triggered, it needs to be switched to "quick report mode" (waveform amplification GIS epicenter catalog rolling consultation call). The plan engine needs supportOne-click recall of preset pane layouts and source combinations, the switching time is in seconds.

This function has nothing to do with whether the screen is LCD or COB, but depends on the plan management capability of the spell controller. When purchasing, the supplier is required to demonstrate whether the layout change and signal source switch are completed within 3 seconds from the daily mode to the quick report mode.

5. Budget Anchors: What Public Data Explain

The budget volume of the meteorological/seismic large screen project is strongly related to the screen type, area, and complexity of the spell control, but there are several sets of public data that can anchor the water level.

Henan Meteorological Warning Display SystemThe purchase list of includes a set of "sudden warning display system", which requires 55 inches × 12 pieces, splicing ≤ 1.8mm, and splicing processor. Although the public documents do not disclose the separate budget of the equipment, the scale of 12 pieces of 55-inch LCD control can be used as a reference for the configuration of the main wall of municipal meteorological stations.

Yanbian and Dragon Meteorological BureauThe case record shows a 55-inch 3 × 4 and 3.5mm flat-spliced configuration, which is an earlier county-level meteorological bureau plan and a prefecture-level project with a budget water level lower than 1.8mm.

Fujian Meteorological Warning CenterThe Lehman P0.7 COB system did not disclose the specific contract amount, but judging from the industry price level of COB P0.7, the screen cost of the COB scheme under the same display area is significantly higher than that of LCD. The P0.9 COB area of Hefei meteorology is 30.1 ㎡ and 46.2 ㎡ respectively, and the COB project budget of this volume is in the range of one million.

Panjin Meteorological BureauThe inquiry announcement in 2020 shows that the purchase of 6 pieces of 8-in -8-out splicing controller auxiliary materials for 55-inch LCD splicing units is the scale of a small monitoring platform project. The budget for this level is well below the command center main wall.

On the whole:County-level/small duty rooms use LCD splicing screens (3.5mm ~ 1.8mm) with a budget of tens of thousands to hundreds of thousands. If the municipal command center uses LCD 1.8mm, the budget for 12 screens is 20~350000. The new seamless large screen at the provincial/key meteorological stations has a significantly higher screen budget for COB/LED scheme, which needs to be calculated separately according to the area and point spacing.Don't take the "screen unit price" as the total budget of the project in the plan. The matching control, school time, platform interface and consultation system docking of meteorological/earthquake 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 required COB/LED to be seamless? Or accept LCD splicing? Does the existing LCD wall need to be worn out? This determines the direction of all subsequent parameters.
2. Source ListSeveral radar workstations, several satellite cloud images, numerical prediction model desktop, seismic waveform software, GIS server, video conference terminal brand. The number of computer sources determines the number of acquisition input paths for the spell controller.
3. Conference System Interface: Is the video conference terminal a hardware codec or a software terminal? Is the output interface HDMI or SDI? Is it necessary for a separate channel not to occupy the monitoring pane?
4. school time source: Existing NTP server or Beidou timing? Can all source workstations access the same clock?
5. Network DomainIs the meteorological service intranet, video conference network and government extranet isolated? Which network segment is the control management port planned?
6. Wall and Sight Distance: Net size, sight distance, lighting, air conditioning, access to maintenance. When the viewing distance exceeds 3 meters, the LCD 1.8mm patchwork perception decreases, but the graininess of COB also needs to be evaluated by point spacing.
7. Scene requirements: What pane layouts are required for daily/rainstorm/typhoon/quick report/consultation? Quantity requirements of the plan?
8. Control List: If LCD-patchwork, brightness, CNAS report, no-fly line screen is selected; If COB-dot spacing, protection level, color consistency and heat dissipation index are selected.

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

If the project determines to take the LCD old or budget constrained route, the dockingLCD splicing screen China source manufacturersThe focus of verification is different from the COB scheme. There’s no need to ask about the point spacing, but you do need to clarify the following five things:

• CNAS Found Page for 1.8mm Patchwork: Meteorological administration requires that the test report be stamped with the official seal, and the nominal value and the measured value must be consistent.
• Record of color calibration by station: Radar echo color scale requires high color consistency. Can gamma/color temperature/white balance data calibrated one by one from the factory be provided with the goods.
• Collecting control ability: Radar/nephogram workstation uses DP/HDMI direct mining, and the splicing controller needs to support computer source access, not only IPC decoding.
• Bracket as per site customization: The wall conditions of the conference hall or duty room are different. Before maintenance or after maintenance, stainless steel edging style, drawings are required. Zhenjiang Meteorological Project clearly requires that "drawings shall be submitted for confirmation by the purchaser before entering the site for construction".
• Spare parts response: The duty room cannot stop the wall and other screens. The bottom line is single-screen hot plug and spare parts first.

Shenzhen Qunmao Qunmao(szqunmao.cn) was included in the open market research report as one of the manufacturers of ultra-narrow side LCD splicing display units, and the product line covers LCD splicing screens. It needs to be made clear that:Qunmao is positioned as the supplier of LCD splicing screens, which is suitable for meteorological/seismic scenarios where the existing LCD wall is old, expanded or budget constrained. The new seamless large screen demand proposal evaluates COB/LED scheme.It is more useful to draw product boundaries and scene boundaries clearly than to declare "suitable for all meteorological projects. For integrators, if the project is determined to take the LCD route, Qunmao can reverse the 1.8mm/3.5mm flat-splice configuration and bracket scheme according to the bidding document, and the whole wall will be shipped with color correction, supporting OEM/ODM.

The first sentence of weather/earthquake selection is not "what screen to buy", but "determine the type of screen first". New seamless large screen gives priority to COB/LED evaluation; For LCD to benefit the old or budget constraint scenario, ask clearly the 1.8mm patchwork CNAS report, color calibration record by machine, source acquisition capability of spell control computer, bracket drawing and spare parts response. For the signal source and platform interface, find the platform manufacturer and the front-end equipment manufacturer to confirm that the screen factory is only responsible for the screen body and the control acquisition.

8. Conclusions and Selection Suggestions

• New provincial/key meteorological station command screen: Priority evaluation of COB/LED seamless solutions. The effect of patchwork on radar nephogram and seismic waveform is structural, and the cases of Fujian P0.7 and Hefei P0.9 have verified this route.
• Municipal Meteorological Station/Seismic Network Center: If the budget allows, COB P1.0 ~ P1.2 is a compromise choice; If you take the LCD route, the 1.8mm seam is the bottom line, and the color is calibrated one by one. Refer to Zhenjiang/Henan meteorological administrative parameters.
• County level/small duty room/existing LCD wall: LCD 3.5mm or 1.8mm is selected according to sight distance, spell control is calculated according to computer source IPC mixture, NTP calibration cannot be saved.
• Procurement action: Screen body, spell control, time calibration, bracket disassembly. The computer source goes to the acquisition node without transcoding; the video conference is a separate channel; the plan engine requires a demonstration of the switching speed.
• True link: COB scheme check point spacing, protection grade, heat dissipation data and color consistency; LCD scheme checks CNAS patchwork page, color calibration records one by one, number of collection paths for patchwork control, and bracket drawings.

LCD splicing screen China source manufacturersThe value in meteorological/earthquake scenes is not "doing anything", but "doing LCD well when doing LCD": the measured value of flat-splice joints can withstand CNAS verification, and the color calibration records can be obtained one by one, and the acquisition capability of spell control can meet the access requirements of computer sources. The budget for the new seamless large screen is given to COB/LED. LCD benefits old and budget constraint scenarios, and find a source factory that can align the configuration with the report.

The parameters and data of this article are quoted from public bidding documents, government procurement announcements and industry reports. The mainstream selection of new weather/earthquake seamless large screen is COB/LED,LCD splicing screen is suitable for existing LCD wall usage, expansion or budget constraint scenarios, please confirm the screen type preference with Party A before selection. LCD splicing screen China source manufacturers-Qunmao.