Are you worried about this? The mall is going to celebrate the anniversary, the school is going to build a lecture hall, and even the hot pot restaurant wants to install a cool large screen - you can search online, and there are as many manufacturers as peppercorns in hot pot, with prices ranging from thousands to hundreds of thousands! What's even more outrageous is that someone bought a screen that cost 80,000 yuan, and "snowflakes" appeared after three months of use, but the repairman said, "This board has been discontinued long ago." Today we broke it and said, how should novice Xiaobai choose large LED screens so that he can't step on the wrong side. (There is a killer skill at the end of the article!)
1. First understand these three fatal issues
1. "What I want is really an LED full-color screen?"
Don't be fooled by your name! There are many types of full-color screens:
- Wall-mountedCorresponding screen, suitable for shopping mall exterior walls
- Can disassemble or installCalled for rental screen, suitable for evening party stage
- It can transmit lightCall transparent screen, suitable for jewelry store windows
Last year, a gym owner bought the wrong floor tiled screen, but all the customers jumped on the screen - the repair fee was more expensive than the screen!
2. "Indoor or outdoor?"
- Indoor screenLike a delicate little princess: brightness 800-1200cd/m² is enough, focus on itGrayscale level ≥16bit, otherwise the sunset is full of color blocks
- Outdoor screenIt must be a tough guy: the brightness must be ≥5000cd/m², and you have to withstand hail hit in typhoons. I have a cold knowledge:A truly qualified outdoor screen will be painted with three-proof paint on the circuit board, otherwise "rust spots" will grow after half a year of use
3. "How long does it take to open every day?"
The screen that is powered on in convenience stores 24 hours a day and only opens during shopping mall activities, the selection strategy is very different! Long-term startup must be launchedCommon-yin drive technology——Save 40% more power than ordinary screens, and save half a new screen in three years of electricity bills
2. Five parameters must be watched
- Pixel spacing (P value)
The smaller the P number, the clearer it is, but the price also doubled. Take a chestnut:
- P6-P8 is enough for shopping mall exterior wall advertising (people stand far)
- Conference room must be below P2.5 (sit close to each other)
Remember the formula:Minimum viewing distance = pixel pitch × 3000(Unit: mm)
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Refresh rate ≥3840Hz
Below this number, all the videos taken are ripple. Test soil method: Turn on the phone camera and aim it at the screen, and the direct pass of water ripples appears!
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Double-layer insurance is required for protection
- Outdoor screen at least IP65 (storm-proof)
- The screens used in restaurants should be protected from oil stains (specially marked with an oil-proof coating)
There is an industry secret:A truly waterproof box can be designed with a breathing valve, balance the air pressure difference between the inside and outside
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The control system must be upgraded
In the 5G era, are you still using USB flash drive to transmit videos? Now the mainstream screens supportMobile APP control + cloud update, some can also automatically switch advertisements with facial recognition
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The warranty period hides tricks
Many businesses say that "three-year warranty" is actually only protected by light beads! It must be written clearly in black and white:
- How many years of power supply module
- How many years does the control system last?
- How big is the free door-to-door range
3. If these pits fall into them, they will be finished.
"If the manufacturer says it is really OK to support customization?"
Last month, a customer wanted to make a curved screen, but what he received was a straight screen that was bent - the light board was cracked! Teach you three tricks to inspect the factory:
① Request to seeReal videos in dust-free workshop(The purification workshop of ten thousand levels is reliable)
② CheckPatent Certificate Number(The official website of the State Intellectual Property Office can be checked)
③ Want72-hour aging test report(Test at 85℃/humidity 85% environment)
"The sample looks good, but the big guys change their faces?"
This is a common problem in the industry! A supermarket owner suffered a loss - the samples were bright in color, but the actual arrival seemed to be covered with gray. remember:
- The contract must be signed with "consistent with the sample sealed product"
- Requires random sampling of large goods
- Leave 10% of the final payment and pay after acceptance
"Where is the agreed installation service?"
The most outrageous thing I have ever seen: the manufacturer sends 30 boxes of parts and lets the customer install it himself! A serious manufacturer should:
- Provide 3D installation renderings
- Installation manual with number
- Send engineers to provide on-site guidance for three days
4. The secrets that only old fry can understand
Do not see the factory date when it is produced
The lifespan of LED lamp beads starts from the day of production! Teach you to distinguish between the old and the new:
- New screen packaging film is elastic and not brittle
- Scan the QR code on the back of the module to display within 3 months
- No oxidation marks on the power adapter plug
Price-pressure killing
Go to inspect the factory at 4 pm at the end of the month! It is best to bargain when sales are making performance, and you can get an additional two years of warranty. Remember the speech:
"Our group will have 20 points this year, and this time we have done a good model and follow-up order..." (Pretend to be a big customer)
The ultimate three tricks for inspection
- Play 4K video for 2 hours, touch the heat sink temperature (no more than 60℃)
- Show pure white picture, use a microscope to see the color consistency of the lamp beads
- Unplug the cable 20 times, test the durability of the interface
(Suddenly lowered your voice) Tell you an industry secret:Manufacturers with monthly output of over 10,000 square meters, the material cost is 30% lower than that of small workshops! Because their chips are directly supplied by fabs, and the box is made by opening the mold by yourself - these are the really cheap and reliable ways!
Having said so much, the safest way is to look at the actual cases. The products of those manufacturers who have done international events and landmark projects have been tested in practice. Next time you go shopping in the mall, you might as well touch the temperature of the display frame and see the workmanship at the joints - good things can speak by themselves!
