Every time you pass by those cool advertising screens in shopping malls, are you curious-why some screens can still display clearly at noon? Why do some displays change color when viewed from different angles? Today we are going to talk about this problem that troubles newbies:​ ​What should you look for when choosing an LED display screen? ​ ​

1. Picture quality is the last word

Many people think that the bigger the screen, the better. In fact,​ ​Brightness, contrast, refresh rate​ ​It is the key to determine the display effect. For example, if the brightness of an outdoor advertising screen is lower than 4000cd/m², the screen will turn gray when the sun shines, making it impossible to see the content clearly. Some manufacturers will advertise brightness values, but​ ​Intelligent brightness adjustment​ ​This is real skill - it automatically increases the brightness to 7500cd/m² during the day and drops to 800cd/m² at night, which saves power and protects your eyes.

Another example is the big screen at the concert.​ ​Refresh rate lower than 1920Hz​ ​If so, there will be smearing on the screen when the singer moves quickly. Just like using a mobile phone to take pictures of a high-speed rotating electric fan, the edges of the blades are blurred. At this time, the screen needs to be refreshed more than 1920 times per second to ensure that every action is clean and crisp.

2. Don’t be fooled by parameters

Some merchants brag about their high resolution, but if they are installed on a stadium fence 20 meters away, the display effects of P2 and P4 will be indistinguishable to the naked eye. Here's a useful formula:​ ​Best viewing distance = pixel pitch (mm) × 1000​ ​. For example, the viewing distance of a P4 screen is 4 meters. Choosing a smaller spacing beyond this distance is a waste of money.

A more hidden pit lies​ ​Color reproduction​ ​. Some screens look bright, but the reds are more orange and the greens are bluish. A good screen will use NTSC 110% wide color gamut technology to restore the lipstick color test and clothing fabric texture in the advertisement to be consistent with the real thing. Next time you go to the mall, you can pay attention to the display screen of the beauty counter. The ones where you can clearly see the details of the mascara brush head are the best products.

3. Pay attention to installation and maintenance

Have you ever seen a screen where black spots appear after half a year? This is often because​ ​Protection level is not up to standard​ ​. A truly reliable outdoor screen must achieve IP65 protection - when it rains heavily, the rain rolls off like a lotus leaf, and dust does not get into the gaps during sandstorms. Here’s a little trivia: the back of the screen is more susceptible to moisture than the front, so the thickness of the waterproof tape at the interface must be at least 3mm.

Speaking of maintenance, the design that requires dismantling the entire screen to replace the lamp beads is long out of date. Now advanced​ ​Modular design​ ​, just like putting together Lego blocks. If there is a problem in any area, the corresponding module can be directly replaced, and the repair can be completed in 20 minutes. Some venues can even provide uninterrupted power for maintenance, and screen repairs during the concert will not affect the performance.

4. Scene matching is the most critical

The poster screens used in convenience stores and the circular screens used in stadiums are not the same thing at all. The former requires​ ​More than 86% light transmittance​ ​, ensuring that customers can see the screen content and the products on the shelves behind them at the same time； For the latter, arc splicing technology must be considered to ensure that the picture seen by viewers from every angle is not deformed. There is a classic case: a certain stadium used the wrong screen type, causing the score numbers seen by spectators on both sides to be distorted.

The popular human-screen interactive technology now tests hardware even more. For example, if the dance floor tile screen can withstand the trampling of high heels, it must also be​ ​Respond to footsteps within 0.01 seconds​ ​, turning the pedaling position into a blooming flower pattern in real time. Special tempered glass is added to the surface of the lamp beads of this kind of screen, so even if beer is spilled on it, the touch sensitivity will not be affected.

5. Keep an eye on the service network

Have you ever encountered a problem with your screen and couldn’t find anyone to fix it? Focus on the manufacturer​ ​Service response speed​ ​: Door-to-door service within 24 hours is just a passing standard. A truly professional team can perform remote diagnosis and spare parts storage. For example, manufacturers that set up local warehouses in core cities such as Tokyo and Seoul can send parts three days faster than sending parts from China at critical times.

Remember to ask before paying​ ​Warranty coverage​ ​: Is the warranty for the whole machine or the main components? Will the lamp be replaced free of charge if the brightness reaches 70%? Some hidden terms will state that "human factors" do not guarantee the warranty. If the screen is damaged by a typhoon, it will be your responsibility.

Editor's point of view: Choosing an LED screen is like wearing glasses. No matter how beautiful the parameters are, it is not as good as the actual experience. It is recommended to bring frequently played video materials to see the prototype on site, and observe it for half an hour from a daily viewing distance, which is ten times more effective than looking at the parameter table. remember——​ ​A good screen speaks for itself​​。

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