I wonder if you have noticed that there are more and more vehicles on the streets with cool screens recently? Two days ago, I saw a courier car on the road. The roof screen was updating logistics information in real time. Even when waiting for the red light, passers-by took photos with their mobile phones. How do you install this roof LED screen? Where is the best place to install? Let’s talk about this topic today.

Selection of installation location

Some people may think it's just the roof, just fix it. In fact, there are a lot of things to pay attention to here. Last year, when the bus system of a city was upgraded, 27% of modified vehicles were moved while driving due to improper installation location. ​ ​Three key installation positions​ ​Need to focus on:

1. ​​Front of the roof​ ​(30-50cm away from the windshield)
   The advantage is that the viewing angle is large, but special attention must be paid to the wind resistance coefficient. Professional test data shows that the wind pressure at this position at a speed of 80 kilometers per hour is equivalent to a typhoon of 12.

2. ​​Luggage rack area​​
   Many SUV owners choose, but they need to confirm the maximum load bearing on the roof. A brand of vehicles found that the center of gravity shift after the installation of the screen caused the brake distance to increase by 1.2 meters.

3. ​​Special stent position​​
   Customized installation is required, such as the lifting structure commonly used in cold chain transport vehicles, and the screen height can reach 4.5 meters after being expanded.

These parameters must be silly

A friend asked me: "What indicators should I look at when choosing a roof screen? "According to data released by the traffic management department, 43% of vehicle advertising screens were ordered to rectify last year because of failure to meet the standards. Here are the key points for you:

​​Brightness adjustment​ ​: It is recommended to choose a model of 4000-7500cd/m² for outdoor screens, and be careful to have intelligent photosensitive functions. The most exaggerated case I have ever seen is that a car has not adjusted its brightness at night, and it directly shakes the driver behind the car and brakes urgently.

​​Refresh rate​ ​: Never be below 1920Hz! This parameter directly affects the shooting effect. Previously, the screen of a certain internet celebrity car was full of water ripples during live broadcasts because of insufficient refresh rate.

​​Structural strength​ ​: It must be able to withstand the impact of 5 times the acceleration of gravity. The roof screen of a car was blown away last time on a typhoon. After checking, it turned out that the tensile strength of the bracket did not meet the standards.

Six major pitfalls in the installation process

The most likely things for beginners to fall apart, I will give you a list:

1. The line wiring is not electromagnetically shielded, causing noise on the car radio
2. Forgot to reserve the maintenance port, change the power supply module and remove the entire ceiling
3. Waterproof treatment cut corners, and the screen turns into a water curtain hole on rainy days
4. Uneven weight distribution, vehicle roll intensifies when cornering at high speed
5. Improper position of the signal receiver, frequent disconnection during driving
6. The heat dissipation air outlet is incorrectly oriented, and the hot air blows directly at the rear vehicle windshield

There is a real case where a fast food truck had a fuel consumption soared by 18% after installing the screen. Later, it was found that the installation angle caused the wind resistance coefficient to increase. So it’s really important to say that a professional installation team is really important!

Maintenance and cold maintenance knowledge

Maybe you will ask: "If you put this thing in the car, don't worry about it?" "A big mistake! According to industry statistics, the service life of the roof screen regularly maintained is extended by an average of 3.2 years. Remember these maintenance points:

• Clean the dust of the heat dissipation hole every week (the thickness of gray accumulated exceeds 2mm and the heat dissipation efficiency is reduced by 40%)
• Check pixel failure efficiency every month (warning is required if it exceeds 0.3%)
• Waterproof glue strips must be updated before the rainy season
• Preheating mode should be activated in the sub-zero environment in winter

Recently, a friend who started a wedding company complained to me that there was a screen in his fleet that suddenly started to flash snowflakes, and it turned out that the connector was oxidized. This problem can actually be avoided by taking anti-corrosion treatment in advance.

The red line of regulations cannot be touched

Finally, I would like to remind you that the management regulations for on-board screens vary greatly in different places. For example, some cities require:
→ The screen time must not exceed 18 hours/day
→ Playing dynamic videos is prohibited while driving
→ A light shield must be installed on the edge of the screen
→ The driver's line of sight shall not be less than 1.5 meters

There was a case last year when a businessman installed LED light strips around the screen, but it was found that it was illegally modified with lamps. Not only was it fined, it had to be removed and reinstalled. So the money for compliance review is really not saved!

Now more and more cities are starting to promote smart transportation, and the roof screen is changing from an advertising carrier to an information terminal. But the smarter the equipment, the more professional installation and maintenance are required. Those on-board display solutions that can ensure safety and enhance commercial value will sooner or later become the standard configuration for urban mobile landscapes. However, we ordinary car owners must do their homework before modifying it!

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