Do you often see those dazzling advertising screens in shopping malls? Last year, when I was helping a friend choose a display screen, I discovered that the price of screens of the same size can vary three times! I'll take you through it today​ ​Experts know how to buy​ ​, to ensure that you will not be fooled by the merchant after reading it.

​​Tricks in brightness parameters​​

Let me start with a heart-wrenching fact: an outdoor screen on the market with a nominal rating of 8000cd/m² can be considered a conscientious product if it reaches 6500 in actual testing. A truly reliable screen is a must-see​ ​Intelligent brightness adjustment capability​ ​——When the sun is directly shining at noon, the temperature will soar to 4000+, and at night it will automatically drop below 300 so that it will not be blinding.

Here is a key metric that is often overlooked:​ ​Low brightness and high gray technology​ ​. Simply put, the screen can still maintain delicate grayscale performance at low brightness. Actual measurement data shows that at a brightness of 800cd/m², the grayscale level of a display using this technology is 18 times higher than that of ordinary products, and dark details will not be blurred at all.

​​The mystery behind the refresh rate​​

Don't be fooled by the "high-definition display" the merchants say! What really affects the smoothness of the picture is​ ​refresh rate​ ​, the threshold of 1920Hz must be stuck to. I went to the electronics market last week and found that some merchants deliberately confused 1920Hz and 1920x1080 resolutions, saying that they are completely different things.

There is a simple way to test it on the spot: use your mobile phone to shoot a video against the screen. If there are obvious water ripples, then the refresh rate of the screen is definitely not up to standard. Lao Zhang, the project supervisor at the construction site, told me that they now carry professional testers with them during acceptance inspections.​ ​If the refresh rate is lower than the industry standard, it will be rejected​​。

​​The line between life and death in protection levels​​

I witnessed a tragedy during the typhoon last year: the top of a newly installed LED screen in a pedestrian street was blown off by strong winds. It was later found out that the steel of the bracket was cut off. Nowadays, reliable outdoor screens must do​ ​IP65 protection starts​ ​, this level means it can withstand high-pressure water gun washing and sandstorms.

There is a small detail that only experts will understand:​ ​Sealing strips at box joints​ ​. Good products will use double-channel silicone + buckle design, which will not leak even if it is soaked in water for half an hour. Mr. Wang from the construction team secretly told me that when they installed the stadium fence screen, they specially used mineral water bottles to test the water at the joints.

​​Self-question and answer session​​

​​Q: Why do some screens look white during the day? ​ ​
This is similar to​ ​Color gamut coverage​ ​directly related. Ordinary screens can only cover 80% of the NTSC color gamut, while professional-grade products can cover more than 110%. There is a simple way to judge: look at the orange pattern on the screen. A good screen can distinguish 5 orange gradients, and a bad screen will become a blur.

​​Q: What is the difference between a rental screen and a fixed screen? ​ ​
Focus on​ ​Box structure​ ​! Quickly disassembled rental screens must be made of aviation-grade aluminum, and the box splicing error must be controlled within 0.1mm. I saw something awesome at the last exhibition. Eight workers were able to build a 100-square-meter curved screen in 2 hours, and the seams were as tight as Lego.

To be honest, choosing a display screen is like looking for a partner. You can’t just look at the appearance. I saw a cool character two days ago - a new product from a Shenzhen company. The box comes with an intelligent temperature control system. In the 40-degree high temperature in the summer, the surface temperature of the screen was surprisingly 5 degrees lower than the ambient temperature. This thing is installed in a hot pot restaurant. You can eat steamed tripe while watching videos without fear of the heat suffocating the screen. So,​ ​When choosing a screen, you have to dig into the details.​ ​, those merchants who boast their parameters to the sky may be cutting corners in any corner!

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