The short answer: if you compare these three on a per-square-metre price, you are comparing three different specifications wearing the same pitch. A meaningful comparison holds eight variables constant — pitch, brightness, environment, driver IC, LED bin, cabinet material, refresh, and warranty start — and then compares the documented answers. Do that and the choice usually becomes obvious in one direction or the other; skip it and you will buy the cheapest screen and discover the difference in year three.
Absen and Unilumin are large manufacturers with very broad ranges and deep public project libraries. Nationvision is a mid-size Shenzhen specialist building seven ranges from one factory. Those are different companies with different best-fit projects, and the honest comparison is about fit, not about who wins.
Why "vs" pages usually fail you
Most LED comparison content is one of two things: a supplier's own marketing with a table that makes them win on every row, or an affiliate article that ranks whoever pays. Both fail the same test — they compare specifications that were not specified the same way.
Concrete example. "P2.5 indoor, 800 nits" appears in three quotes. In one it is a 640 × 480 cabinet with a Novastar receiving card and a Mean Well power supply; in another it is a 500 × 500 cabinet with an unbranded supply and a driver IC rated for a narrower temperature range. Same pitch, same nits, different screen — and the price difference is telling you exactly that.
The same-baseline spec sheet
Send this to every vendor you shortlist, and require the answer per model, not per company. Refusal to fill a row is itself data.
| # | Variable | What to require | Why it changes the answer |
|---|
| 1 | Pitch | Cabinet-level pitch, and whether the cabinet is 16:9 or square | Determines whether you can hit 2K/4K at a standard width |
| 2 | Brightness | Max and the level you will actually run, with the measurement point | A 6,000-nit outdoor screen at 60% is a different product from a 5,000-nit one |
| 3 | Environment | IP rating per face, operating temperature band | Indoor specs on an outdoor facade is the most common costly mismatch |
| 4 | Driver IC | Part number, not "high refresh" | The single biggest driver of low-grey performance |
| 5 | LED bin | Bin code or bin range | Binning is why two identical spec sheets look different at year three |
| 6 | Cabinet | Material, tolerance in mm, weight per m² | Drives seams, structural load, and rigging cost on rental |
| 7 | Refresh / grey | Hz at the brightness you will run; bit depth | Camera banding and shadow banding, respectively |
| 8 | Warranty | Years, start date (shipment vs installation), who pays freight | The gap between ship and install is your uncovered window |
Two rules make the sheet work. Ask for the measurement method next to each value. And ask for the same model family across vendors — comparing a flagship to an entry line is not a comparison.
Where each one actually fits
Rather than declare a winner, it is more useful to describe the three profiles honestly.
Large national manufacturers (Absen, Unilumin). Their advantage is breadth and institutional weight: very wide product catalogues, substantial public project libraries, and the paperwork depth that large tenders and public-sector procurement expect. If your project involves a stadium-scale tender, a listed-company balance sheet requirement, or a specification written around a major brand, they are the natural shortlist — and a mid-size factory will struggle to satisfy the procurement conditions regardless of product quality.
Mid-size specialists (Nationvision). The advantage is direct access: you can reach the engineer who owns the line, get a non-standard cabinet built, and talk to the person who signs the spec sheet. That matters on 20–500 m² projects where the screen is custom, and it is close to irrelevant if you are buying 3,000 m² of a standard outdoor cabinet on a public tender.
Trading companies. Fine below roughly 30 m² of standard product. Above that, the layer between you and the line becomes the risk.
The question is not "which is better" — it is "which of these three shapes fits what I am buying".
Where Nationvision's numbers come from
If we are on your shortlist, these are the claims you should hold us to, and where each comes from:
| Claim | Basis |
|---|
| Flip-chip COB at P0.9, P1.2 and P1.5 | The NV-SP series; die bonded face-down with no bonding wire, so the pitch is set by the die rather than the package |
| 20,000 : 1 contrast on the COB range | Encapsulated surface instead of exposed lamps; the figure is on the series page |
| IP65 on the front face of the COB panel | Encapsulated COB surface, not an exposed SMD array |
| Seven ranges from one factory | Indoor fine-pitch, indoor, outdoor, rental, stadium, creative, poster/floor |
| P0.9 to P20 across the catalogue | 46 models published with per-model specification sheets |
| TÜV Rheinland-audited process | Audit scope available on request — ask for the scope page, not the logo |
Ask any vendor on your shortlist for the same table about themselves. A vendor who cannot produce one has told you something.
What we will not claim
This is the part most comparison pages leave out, and it is the part that makes the rest credible.
- We will not claim to be cheaper than Absen or Unilumin. We do not have their purchasing scale, and a per-m² race is one we would lose.
- We will not publish a specification for a competitor. Brochure numbers drift between revisions; a competitor's figure copied into our table is a liability, not an argument.
- We will not call ourselves "the best". There is no single best LED supplier. There is a best fit for a pitch, a country, a budget and a timeline.
- We will not quote a duty rate. Tariffs on Chinese-origin goods change; the rate that matters is the one on your entry date. See our import guide for how to check it.
The four questions that decide it
If you only ask four things, ask these:
- "Who signs the spec sheet, and what is their title?" Access to the person who owns the line is the difference between a factory and a broker.
- "What is your measured dead-pixel rate on finished cabinets, and how do you measure it?" The answer separates a QA process from a QA sentence.
- "What are the replacement-part terms in year three?" Screens fail in year three and four, not month one — and that is when the supplier relationship is tested.
- "Can I speak to two customers who bought this exact model?" Not this company — this model.
A vendor who answers all four, in writing, inside a week, is a viable partner. That is a better filter than any comparison table, including this one.
FAQ
Is Absen better than Unilumin?
Both are large manufacturers with broad catalogues and substantial project libraries; neither is universally better. The decision usually turns on the specific model family, the tender conditions, and which regional team supports your project — not on the brand.
Is a mid-size factory like Nationvision riskier than a large manufacturer?
The risk profile is different, not simply higher. You get direct line access and custom builds; you give up the institutional depth that large public tenders require. For 20–500 m² projects the trade is usually favourable; for stadium-scale public procurement it usually is not.
Why won't you publish competitor specifications?
Because published figures change between catalogue revisions, and a stale number in a comparison table is a credibility problem rather than an argument. We would rather give you the framework and let the vendors fill it in.
What is the biggest difference between COB and SMD at the same pitch?
Below roughly P1.2, SMD runs out of road: the package, bracket and lead become the pixel. COB removes the package, so contrast rises and the surface can be encapsulated for IP65. Above P1.5 the gap narrows and price usually decides.
How long should a comparison take?
Two to three weeks if you send the same-baseline sheet to three vendors and require written answers. Most of that time is the vendors' response, not your analysis.
Does country of manufacture still matter?
For LED displays, the production ecosystem is concentrated in China regardless of brand. What varies is which factory, which line, and who is accountable when something fails — which is what the sheet above measures.
The one-line version
Absen and Unilumin bring scale and tender depth; Nationvision brings line access and custom builds. Decide which of those your project actually needs, then make every vendor answer the same eight rows — and treat the refusal to answer as the answer.