Dear readers, have you noticed the super large LED advertising screens on the street that are hotter than barbecue grills in summer? Today I will take you to solve this mystery-​Where does the best place to dissipate heat from LED screens?​​ Don’t rush to find out the answers. Let’s play “Let’s find fault” first: imagine that the same outdoor large screen will be the same as new for three years, and some will appear color spots and black spots in just half a year. The problem is likely to lie in the "hidden level" of heat dissipation.

1. Where does the heat come out?

Let’s first understand the “heating major players” of LED screens. Just like when cooking, you have to know the heat, and when repairing a car, you have to find the fault point. To solve the heat dissipation problem, you must first find out these "heat-producing professionals":

• ​​Light beads themselves​: Although a single LED lamp bead is only the size of a rice grain, 100,000 of them work together, and switch it thousands of times per second, the heat generation is even stronger than that of a microwave oven.
• ​Driver chip​: The "nervous system" equivalent to the screen, 24-hour high-intensity work will inevitably produce a lot of calories
• ​Power supply module​: Just like the "heart" of the entire system, the greater the power, the more exaggerated it will be.

Let me give you a real case: the curved advertising screen in a commercial square was just installed and the effect was amazing. As a result, in the summer of the next year, a large area of ​​color shift occurred in the lower half of the screen. Disassembly inspection found that​The bottom heat dissipation hole was blocked by willow catkins​​, resulting in the driver IC working at a high temperature of 85℃ for a long time, directly burning the chipset.

2. The heat dissipation location reveals the secret

(1) Basic version: Natural heat dissipation

Suitable for scenarios:​Indoor conference room screen, temporary stage rental screen​​
The principle is like when we shake a palm fan in summer, it depends entirely on the flow of air to take away heat. This type of screen will usually be:

• ​Bottom of the box​Open the honeycomb air intake hole (note that it is not completely drilled, it is necessary to have a dustproof net)
• ​Top Edge​Make a hidden exhaust slot
• ​​The back of the power module​​Thermal silicone pad

But be careful! Last year, there was a menu screen in a restaurant restaurant. In order to save money, the boss stuffed the machine into a wooden decorative cabinet, but the high temperature caused the screen driver board to be deformed.​​Natural heat dissipation must ensure smooth space of 30cm in front and rear​​, this lesson is worth 200,000 yuan in repairs.

(2) Advanced version: Active heat dissipation

​​Outdoor advertising screen, large stadium screen​​A must-have solution is equivalent to installing a "central air conditioner" on the screen. There are three core positions:

1. ​​The waistline position on both sides​​Axial flow fan (diameter 50-60cm is most suitable)
2. ​​At the top eaves​Install the exhaust system
3. ​Key hot spotsBuried temperature sensor

There is a very clever design: the arc screen of a certain sea-crossing bridge,​Inside the keel bracket​The cooling air duct is pre-buried and natural convection is used to save 80% of the air conditioning electricity bill. I will give this kind of cooling idea of ​​"leveraging the power to fight the power" to achieve full marks.

(3) Top version: Mixed heat dissipation

​​Ultra-high-definition transparent screen, floor tiles interactive screen​​For this type of high-end product, you can play with "radiation black technology":

• ​Pixel gap​Inlaid micro-radiation fins (thickness is only 0.3mm)
• ​​Module back​​Use graphene thermal conduction film (thermal conductivity is 5 times that of copper)
• ​Structural gap​Make aerodynamic diversion tank

Last year, the 360-degree ring curtain of a science and technology museum was right here​At the joints of each box​​Designed a shark gill-type heat dissipation structure. Test data shows that the temperature at the same brightness is 12℃ lower than the conventional design, and the key is that it does not affect the visual effect at all.

3. Choose a position and look at the "measures"

Don’t think that just a few holes can dissipate heat. There are many more details here:

1. ​Area​: 20㎡ is a watershed

   • Small screen (＜20㎡): Two 500mm fans on both sides are enough
   • Large screen (>20㎡): 1 600mm fan is installed for every 10㎡ additional
     (The southern region needs to add another 30% balance, don’t ask why, Guangdong will teach you how to be a human being)

2. ​​Installation method​：

   • Wall-mounted screen: Top exhaust air + bottom air supply air forming a "chimney effect"
   • Column screen: open the middle blinds to intake air, and fan at the top exhaust air
   • Floor-standing screen: It must be raised by 30cm, and a dust-proof air intake layer is installed at the bottom

3. ​​Ambient temperature​​：
   There is a calculation formula that is very practical:​Required cooling power = total screen power × 65%​. For example, a 50㎡ 4K screen in a shopping mall consumes a total power of 35kW, which requires at least 22.75kW of cooling capacity, which is equivalent to having 6 3-horsepower air conditioners.

4. Discussion on personal blood and tears experience

I have been working in the display screen project for more than ten years and have seen too many "radiation rollover scenes". Let me talk about some easy pitfalls:

• ​​Waterproofing and heat dissipation are mortal enemies​: The water screen in a scenic spot sealed the heat dissipation hole in order to prevent water, and the chips went on strike collectively. Now we all use​Labyrinth-type waterproof heat dissipation structure​​, both blocking rain and ensuring ventilation
• ​Don't be superstitious about air conditioning​: The most outrageous thing I have ever installed is that I have equipped 8 air conditioners for a 20㎡ screen, and the electricity bill is even more expensive than the screen itself. ActuallyFan + Intelligent Temperature Control​is the king of cost performance
• ​​Regular cleaning is important​: The worst case has been encountered. The screen of a gas station in the north is covered with heat dissipation holes, which causes the line to burn spontaneously. Now we all come standard​Automatic ash cleaning filter​​, can save 30,000 maintenance fees in half a year

Recently, I am helping a fence screen for an international event, and innovatively adopted​Liquid metal heat dissipation layer​. After testing, the temperature dropped by 18℃ under the same working conditions, and the key is to compress the screen thickness by 30%. This technology that "hides heat invisible" is definitely a future trend.

5. Three advice to Xiaobai

1. ​​Heat dissipation design is not a cost but an investment​: Spend 10,000 more heat dissipation, saving 50,000 repair costs
2. ​​The most important thing to adapt to local conditions​: The cooling solution between the seaside screen and the desert screen is very different
3. ​​Dynamic monitoring must not be missing​: Nowadays, high-end screens have intelligent temperature control systems, and the temperature exceeds the standard will automatically reduce brightness and ensure safety

After all, cooling is like tailoring people. Don't look at those fancy technical parameters, seize them​Heat generation point →Heat dissipation path →Emission outlet​This core driving line ensures that your screen is cool in summer and warm in winter. Next time, you will see the large screen on the street. You might as well look closer and take a look at its cooling design - maybe you will find the little thoughts hidden by the engineers!

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