Friends who are engaged in outdoor large screens all know that the surface treatment technology of the display screen directly determines the service life. Recently, some engineering companies are asking: If you want to find a reliable vacuum coating process, what indicators should you look at? To be honest, this nano-level protective coating is the key for outdoor screens to withstand the sun and rain.

​​What exactly does vacuum coating prevent?​​
This film looks like invisible armor on the screen. It mainly protects against three things:

• ​​UV rays​ ​(Delay the aging of lamp beads)
• ​​Salt spray corrosion​ ​(A must for seaside projects)
• ​​electrostatic adsorption​ ​(reduces dust accumulation)
  There is a real case: two screens of the same model were installed in a coastal city. The coated one had a brightness attenuation of less than 15% after three years of use, and the uncoated screen showed chromatic aberration in half a year. Whether the money is worth it or not depends on the data.

​​Coating quality depends on three hard indicators​​
The easiest pitfall for novices is to only look at the price. What you really want to keep an eye on is:

1. ​​Film thickness ≥2.5μm​ ​(On-site inspection with thickness gauge)
2. ​​Transmittance loss＜3%​ ​(Good coating does not affect the display effect)
3. ​​High temperature resistance 85℃ test​ ​(No blistering if exposed to the sun in summer)
   Here is a comparison table:
   | Test items | Standard products | Inferior products |
   |---------|---------|---------|
   | Salt spray test | No rust for 1000 hours | Oxidation point appears after 300 hours |
   | Transmittance change | Decline 1.2% | Decline 5.8% |
   | Adhesion | Grade 5B (no peeling) | Grade 2B (edge ​​lifting) |

​​Where to find reliable coating services​​
Nowadays, there are many good and bad people in the market. Here are three tips to avoid pitfalls:

• Check if the factory has ​ ​Dedicated dust-free workshop for vacuum coating​ ​ (Dust-proof level is at least 10,000)
• Check if the device is ​ ​Magnetron sputtering coating machine​ ​ (More uniform than ordinary evaporation coating)
• Ask clearly ​ ​Warranty period​ ​(Only those who dare to guarantee it for more than five years are reliable)
  Everyone in the industry knows that there is an export factory in Shenzhen. The temperature and humidity control in the workshop is accurate to ±1%, and the coating yield can reach 99.3%. The fence screens they made for Japanese stadiums are fine even if they are submerged in seawater during a typhoon.

Some people may ask: Is it okay to find a coating factory to process it myself? I advise you not to mess around - surface treatment after the display is assembled can easily damage the driver IC. It is best to find someone who can handle everything from chip packaging to full screen assembly. ​ ​Full process automatic control​ ​ manufacturer, so that the coating process can match the overall design.

The editor finally tells the truth: some manufacturers now boast about how advanced their coating technology is, but in the end they cannot even pass the basic temperature cycle test. If you really want to verify it, do two sets of experiments on the samples: one set is frozen to -30°C and then immediately heated to 60°C, cycled 20 times ； Another group used wire brushes to simulate hail impacts. Those who can withstand these two levels are truly skilled.

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