My friend who has just entered the industry always asks me: "Where should this LED large screen be put into place? I am afraid of being hit by a car on the side of the road, and I am afraid of falling off the wall! "This reminds me of the misunderstanding in a commercial square last year - the construction team put an 8-meter-long poster screen directly above the fire escape, and was ordered to be demolished by the urban management the day before its opening. Today, let’s talk about the “screen installation and location selection” approach.

▌Three elements of site selection: visible, reachable, and hold on
Choosing a location is like a blind date, and you have to pay attention to a "family match". Let me first talk about a real case: a chain of convenience stores installed a 55-inch LED sign directly above the cash register, and it was dismantled after three months of opening. Why? Customers always look at the price list when they are blinded by the reflection of the screen! Here is the key point:
​​①Visible distance = screen height × 30​ ​(For example, a 2-meter-high screen, the best viewing distance is 60 meters)
​​②Maintenance channel ≥ Screen width × 0.6​ ​(Don't let yourself become a "spider-man")
​​③Load bearing load ≥ 1.5 times the weight of the screen​ ​(Concrete walls and light steel keels are not the same)

▌Environmental matching: Don't let the display screen "become unacceptable to the local environment"
Last year, I helped my friend debug a transparent window screen, which was installed in the floor-to-ceiling windows of luxury goods stores with excellent results. But the screen of the same model was moved to a seafood restaurant as a menu and it was scrapped in half a year - guess what? The steam drilled into the heat dissipation hole, and the circuit board was full of moss! Here is a universal formula:
Indoor screen selection​ ​Three degrees​ ​(Temperature, humidity, illuminance)
Outdoor screens are of great importance​ ​Three defenses​ ​(Waterproof, dustproof, corrosion-proof)
For example, hot pot restaurants are suitable for IP54 protection front desk screens, and you must choose IP65 dustproof model at construction sites.

▌Power supply wiring: Be careful of "electric tiger" showing its power
The most outrageous installation I have ever seen is to directly slam the distribution box behind the display screen, and the electromagnetic interference caused the picture to shake like a disco. Here is a real thing:
​​High-electric wiring distance ≥ 80cm​​
​​Weak current signal cables must have shielding layers​​
​​20% margin reserved for total power​​
Once, I installed a stage floor tiles screen for the concert. The electrician tried to save trouble and tied the power cord and the audio cord together. As a result, the singer opened his voice and the large screen flashed with the rhythm. Later, I took the special line again and solved it. This lesson is worth 20,000 yuan in tuition!

▌Perspective Positioning: Don't have the nightmare of "head-downing people"
Have you seen the curved advertising screen in the shopping mall atrium? When I installed it, I adjusted the elevation angle to 45 degrees in order to make the shape cool. As a result, when customers were watching advertisements on the escalator, they all had to perform "cervical rehabilitation exercises". Remember this golden ratio:
​​Horizontal viewing angle ≤ 120 degrees​​
​​Vertical viewing angle ≤ 30 degrees​​
If installed on the stadium fence, the corner must be adjusted to 15-20 degrees so that the audience sitting in the stands will not feel that they are watching "Alien Guests""

▌Heat dissipation and ventilation: install a "respiratory system for the screen"
I handled a strange case last month: a gym embedded a large 75-inch screen in the partition wall of the locker room, but the screen was blacked out at 5 pm every day. I opened it and saw that the guy was looking at it - the heat dissipation port was facing the steam room! Here are some tips for testing:
Two hours after turning on the machine, use an infrared thermometer to sweep the border
Normal temperature difference ≤ 15℃
The heat dissipation spacing ≥ 2 times the screen thickness
Like those who need to be installed in the wall, remember to open a honeycomb hole on the back plate, just like installing a "breathing valve" on the screen.

Speaking of this, some friends may ask: "What is the difference between a rental screen and a fixed screen installation? "Good question! The detachable screen set used in the music festival last year, each box has a quick-connect buckle. This design allows for installation errors of ±5 degrees and is especially suitable for temporary construction. The fixed screen must be controlled within ±1 degree, otherwise the splicing seam will become "centipede legs"."

Personal opinion time: I have seen too many people use LED screens as decorations, but in fact it is a "environmental creature". When installing it in a glass curtain wall, the light transmittance should be considered. The wind load should be calculated when placed in the column advertising space, and even shade should be taken into consideration. Next time you choose a location, you might as well take out your phone to take a panoramic photo and use the picture editing software to simulate the visual effect - this trick is better than any theory!

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