Alas, recently I received a rush question from the backstage: "The LED large-screen video I just bought has afterimages. Are you buying a fake product? Where should I go to check it?" To be honest, this question really comes to the point! Today we will break it apart and talk,LED display screen detects the doorways​​, you will be more sensible than the screen seller after watching it.

1. If these testing items are not done, regret it

Last month I saw a case with my own eyes - a shopping mall spent 800,000 yuan to install the screen because it was not done.​Color uniformity detection​, when the blue sky and white clouds are soaring, it feels like a mosaic. Remember the five must-do testing items:

1. ​​Brightness uniformity​(The brightness difference of full screen cannot exceed 15%)
2. ​Color Gamut Coverage​(NTSC standard must reach more than 92%)
3. ​​Refresh rate measurement​(The truth can be drawn from the slow motion mode of the mobile phone)
4. ​​Protection level verification​(Outdoor screen must be tested for IP65 spray)
5. ​​Continuous Aging Test​(Hidden dangers can be exposed if the 72-hour round is rotated)

Take a look at a chestnut: The screen of a certain exhibition last year was black, but later it was found out that it was​Power module load detectionNot done well. Here is a key point - if there are no these five items in the test report, it is no different from waste paper!

2. How to choose a testing agency so as not to be cheated

I heard that a merchant prints a test certificate by itself? Here are some tips for you:

• ​​Identify the CNAS logo​​ (National certified laboratories are qualified)
• ​Check the equipment list​ (Optical detector must have NIST certification)
• ​​View the detection environment​(The background illuminance of the dark room should be ≤1lux to be professional)

Comparison of the differences between different types of detection:

Special reminder: There are some tricks in testing now, useAlternative testing​Missing people. For example, if you test the entire screen, you only test the module, and you will not recognize this kind of report when you take it to the rights protection court!

3. Self-test secrets that Xiaobai can also do

Don't rush to send inspection! First do these four tricks to investigate:

1. ​​White screen to see the bad points​: Under the entire white background, dark spots visible to the naked eye 3 meters away are not qualified
2. ​Grayscale test​: Play 256-level grayscale images, and being able to distinguish the differences of 1-5 levels is considered to meet the standards
3. ​​Temperature gun scanning​: After working for 1 hour, the temperature difference between each area is >8℃ and there is a problem of heat dissipation.
4. ​​The method of knocking and listening to sound​: Use a rubber hammer to tap the box, and the sound is dull and water vapor may enter

Last week, I used this trick to help my friend inspect the goods and found a wholesale product.​The protective rubber strip has a 0.5mm notch​, when the goods were returned, the merchant was shocked-"Can you see this?"

4. Text games in the test report

The most outrageous report I have ever seen says "comply with corporate standards", but the corporate standards are three times looser than the national standards! Focus on these details:

• The testing basis must be indicated (national standard GB/T 29468-2019 is the bottom line)
• The parameters must be accurate to the decimal point (for example, if the color temperature is written "6500K±50" to be considered true detection)
• Comes with original data record (no conclusions and no process)

Here is a truth: Last year, a certain project was accepted and tested.​View angle detection data​It was actually measured using equipment from 10 years ago, with a large error that can calculate an extra 20° visual angle!

5. What to do if the test fails

Don't panic first! Keeping these evidences can turn the tables:

• Seal the same batch of unopened products (it is best to record the unboxing process for video)
• Requesting three parties to take samples together (representatives from themselves, merchants, and testing institutes)
• Appeal within 15 days after receiving the report (the time-out test center does not recognize the review)

There is a ruthless trick to teach you: ask for itDestructive detection​, for example, if you soak the screen in water for 48 hours, you will only dare to take this job if you are not afraid of real gold and good people who are not afraid of fire.

Editor's opinion: Testing is like doing a physical examination on the screen. Just seeing "no serious illness" is not enough, you have to find out the health indicators of each organ. Those manufacturers who dare to open testing laboratories to customers and can regard international certification as standard are the real people who truly regard quality as their lifeblood. Remember - the screen can speak by itself, but the test report that can speak human language is the amulet for our consumers!

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