Alas, recently a friend asked me: "Where should I buy this small LED surveillance screen? "To be honest, when I first came across this thing, I was confused - there were so many products on the market like instant noodles on supermarket shelves, with prices ranging from hundreds to tens of thousands, which made people confused. Today we will break it apart and talk about how to choose a reliable LED monitoring screen, and by the way, where to buy it is the most worry-free.

1. Let’s talk about the real thing first: what kind of monitoring screen is qualified?

Let's remember this formula first:​​"See clearly + carry it for a long time = good screen"​​. Last year, when I installed a surveillance screen for the community activity center, a display screen reflected severely during the day and blurred at night, and finally it was solely removed and reinstalled. So, you have to open your eyes when choosing.

1. ​​The resolution must be sufficient​​：
   The surveillance screen is most afraid of mosaic faces. If used indoors, the small-pitch screen below P2 can see the details of the face clearly. For example, our common front desk registration office uses P1.8, and even the small words on the visitor's badge can be read very clearly. If installed at the warehouse gate, the spacing between P3 and P4 is enough.

2. ​​The brightness will be varied​​：
   Have you ever seen a display with a big daytime black screen? The brightness of the outdoor screen must reach 5000cd/m² upwards. It is basically useless if it is installed in Erqi Square where the sun shines directly. But don't be so bright indoors. 800-1200cd/m² is just right. It's too bright and staring at it for half an hour.

3. ​​The protection level will be​​：
   Let me tell you the truth - on a typhoon last year, a surveillance screen at a express station was short-circuited, and the three-day monitoring records were all ruined. Therefore, outdoor screens must be selected from IP65 protection level, and those with nano coatings are more reliable. It is okay to use a water gun to rush on rainy days.

2. Which surveillance screen is the most suitable? Don't waste good equipment

Last month, I installed a monitoring system for the chain pharmacies and found that they hid the screen under the cashier. Isn’t this in vain? Share a few practical scenarios:

• ​​Front desk display area​​: Use a transparent screen with a 86% transmissivity to display the surveillance screen without blocking the store layout. Customers can see it at first sight when entering the store.
• ​​Warehouse entrance and exit​​: It is equipped with intelligent photosensitive function, which will automatically brighten during the day and automatically reduce brightness at night, saving power and protecting eyes
• ​​Operation workshop​​: Choose a dust-proof and oil-proof coating, and it will be clean after being wiped with engine oil.

To give a real case: A shopping mall has installed a curved screen, and 36 camera images are put together into panoramic surveillance, but the incident of holding the sheep that month has dropped by 70%. So, if the screen position and shape are designed, it will be twice the result with half the effort.

3. Don’t just look at the price when buying a screen. You need to understand these tricks.

A friend bought a second-hand screen with a cheap picture, but he changed the module three times in three months, and the repair fee was even more expensive than the new screen. Remember these key points to avoid pits:

1. ​​Don't be fooled by "low price and high-end"​​：
   The ones marked "P1.5 is only 2999" on Taobao, most of them are renovated with old lamp beads. The small-pitch screen of regular manufacturers, the cost of lamp beads alone accounts for more than 60% of the entire screen price.

2. ​​The cooling system needs to be passed​​：
   Have you touched the back of the screen that you worked continuously for 8 hours? The temperature difference of a good heat dissipation system can be controlled within 3℃. For example, with 32 channels of temperature control, Dubai can be as stable as an old dog at high temperatures of 55℃ in Dubai.

3. ​​Don't make do with the interface​​：
   Now the monitoring system is heading towards 4K/8K, and HDMI2.0 is all basic configuration. I've seen someone who uses an old interface to connect to a new camera, but the screen is stuck like a PPT

4. How to choose a purchasing channel? Online and offline have their own ways

Last week, I helped my friend compare prices and found that the same model can be 20% different from the price in different channels. Let's talk about the situation:

​​Three notes on offline procurement​​：
① You must look at the manufacturer's "Environmental Guarantee Letter" and "Anti-Blue Light Inspection Report"
② Decisive pass with a grayscale reduction degree exceeding 1.5 under test
③ Ask clearly how long does the warranty last, how long does the module, power supply and control system last?

​​Tips for online procurement​​：
✔ See the details page. Are there any real-time videos to check
✔ Manufacturer direct store with calibration report
✔ Choose a 7-day return or exchange that supports no reason

A friend found a manufacturer on 1688, but the goods and samples sent were not the same as the samples. Later, it was directly purchased from a manufacturer with a production base of 100,000 square meters. Not only was the price real, it was also sent to home maintenance for three years.

Personal opinion time

After working in display equipment for so many years, my deepest experience is:​​The monitoring screen is not a fast-moving consumer goods, and it is really saving money if you can use it.​​. I have seen too many companies spend more money on repairs every year in order to save tens of thousands of dollars. Now mainstream manufacturers are playing the combination of "technology + service". For example, some manufacturers' 24-hour response centers, European customers can provide video guidance after two hours of repair.

Finally, I’ll say that it’s heart-wrenching: buying a screen is like finding a partner, the parameters are hard conditions, and after-sales service is soft power. Next time you want to purchase, you might as well ask more questions: "If there is a problem with this screen in three years, do you care?" "The one who has a reliable answer is a truly reliable partner.

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