Recently, many people have been asking: Why are the advertising screens on buses still clear even when it rains? Where can I buy that red screen with changing words on the back of the logistics truck? Don't worry, today we will explain the car LED screen thing in detail - after reading this article, I guarantee that you will change from a "novice" to a "knowledge king", and you will not have to pay IQ tax when buying a screen!

1. These scenes must be equipped with car screens!

​​the bus​ ​: The long screen on the roof of today’s new energy vehicles is not installed casually! Have to bear it:

• Rinse in heavy rain (protection level is at least IP67, no problem if soaked in water for half an hour)
• 80℃ high temperature exposure (lamp beads must be high temperature resistant)
• Work 24 hours a day (the power module must be military grade)

​​Cold chain logistics vehicle​ ​: The rear window is equipped with a screen to display the temperature, which is very particular:

• It can start normally at minus 25 degrees Celsius (ordinary screens will go black at low temperatures)
• Anti-condensation design (it will be over if the temperature difference between the inside and outside of the refrigerated truck fogs up)
• Comes with backup power supply (can last up to 8 hours in case of sudden power outage)

​​Police car/ambulance​ ​: What are you most afraid of about the warning screen at the top? It’s not bad, it’s just slow response at critical moments! must be satisfied:

• 0.2 second refresh speed (6 times faster than ordinary screens)
• 360° viewing angle (you must also see clearly from the side)
• Anti-electromagnetic interference (police equipment operates simultaneously without cross-frequency)

2. Five hard indicators you must look at when buying a screen

1. ​​Seismic performance​ ​: Only those who have done the ASTM D4169 transportation test are required, otherwise the screws will be completely loose after two months of operation.
2. ​​Brightness adjustment​ ​: It can reach 5000cd/m² during the day and automatically drops below 300cd/m² at night.
3. ​​voltage fluctuation​ ​: Supports 9-36V wide voltage input, so you don’t have to worry about unstable truck battery voltage.
4. ​​Protection level​ ​: Don’t listen to salesmen talking about IP65, car screens must start with IP67 (can withstand water immersion to 0.5 meters)
5. ​​Thermal design​ ​: The thickness of the aluminum substrate should be ≥3mm, and the life of the shark fin heat dissipation structure should be 3 years longer

Let’s take a real case: A certain express delivery company bought ordinary screens for cheap. As a result, 75% of the screens went black at minus 30 degrees Celsius in Northeast China. Each vehicle lost an average of 2,000 orders per day, which made me regret it...

3. The 3 biggest pitfalls that newcomers are most likely to step into

​​Pitfall 1: Buying the wrong power supply method​​

• For small passenger cars, just choose 12V direct supply.
• Heavy trucks must choose 24V with voltage stabilizing module
• Hybrid/electric vehicles must be protected against high-voltage pulses

​​Pit 2: Ignoring the installation method​​

• The roof screen must use an aviation aluminum bracket (thickness ≥ 2mm)
• The rear window screen must be ultra-thin (thickness <3cm)
• The side screen must have an anti-glare coating (clear even at a 45° oblique angle)

​​Pit 3: After-sales service becomes disconnected​​

• Ask if there is a local service point
• See if we can provide 24/7 remote diagnosis
• The contract states a 2-hour response time

4. Soul torture session

​​Q: Why are car screens three times more expensive than indoor screens? ​ ​
A: Expensive​ ​Special materials​ ​! For example, military-grade connectors are five times more expensive than civilian ones, but they can be used for 10 years without poor contact. There is also an anti-salt spray coating, so a car running on the beach will pay for itself after two more years of use.

​​Q: Will I be fined by the traffic police if I modify it myself? ​ ​
A: It is legal if you look for these two certificates:

1. CCC compulsory certification (the certificate number can be checked on the official website)
2. E-mark certification (EU standard, also recognized in China)

​​Q: Is the touch screen practical in the car? ​ ​
A: Never! It's not accurate at all when the vehicle vibrates. If you want to choose physical buttons + APP dual control, the driver can change the content using his mobile phone while waiting at a red light.

5. Expert purchasing list

Save these parameters in your phone for later use:

Finally, I would like to say something from my heart: the more expensive the car screen, the better! Last year, a transportation company paid a high price to buy an imported screen, but the result was that the domestic 4G signal band was not supported and the remote control became a decoration. So, be sure to look for:

• ​​There are real car test videos​ ​(See if the picture is stable on the bumpy road section)
• ​​Can provide three years of data traffic​ ​(necessary for remote update content)
• ​​The factory's monthly output exceeds 10,000 square meters​ ​(Quality control is stable only when the quantity is large)

Next time you go to a manufacturer to inspect, remember to bring a magnet - those who dare to use all-aluminum casings are truly conscientious (many low-quality screens are pretended to be iron sheets, which will be exposed as soon as they are sucked). Choose according to this standard and you can be sure that the screen you buy will last longer than your car!

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