​​Triple confirmation method for physical size​​
A common misunderstanding for beginners is to only look at the numbers on the product manual. In fact, the actual size of the display needs to be confirmed in three dimensions:

• ​​Module splicing calculation​ ​: Single box size × horizontal quantity × vertical quantity (remember to count 2-3mm splicing seams)
• ​​Visual area measurement​ ​: Use the rangefinder to measure the diagonal line of the luminous area after lighting up the screen
• ​​Install the frame space​ ​: Overall placeholder size including the outer frame structure

The actual test of a stadium project shows that​ ​Ignoring the box splicing gap will lead to an actual error of 3.5%.​ ​. Here is a tip: use a red laser pointer to illuminate the four corners of the screen, and the spot spacing is the accurate visual size.

​​Parameter comparison table and scene adaptation​​

​​Key reminder​​：

1. The height of the indoor screen is recommended to be controlled within the audience's head-up angle range of ±15°.
2. Outdoor advertising screen aspect ratio is preferred 16:9 or 21:9
3. ​​Special-shaped screen size​ ​CAD drawings and other ratios need to be verified

​​Installation planning pit avoidance guide​​
​​Why did my screen find the wrong size after I installed it? ​ ​ This problem occurs in three additional links:

1. The location of the building load-bearing beam was not clearly surveyed (a shopping mall project was reworked as a result)
2. Ignore the space occupied by the heat dissipation channel (at least 30cm maintenance area is reserved)
3. The safe distance between the distribution box and the screen is not calculated (strong electrical interference will cause the screen to shake)

Here is a trick:​ ​Use AR to measure the APP preview installation effect​ ​, can intuitively see the proportional relationship between the screen and the environment. Remember to frame the "invisible sizes" of fire passages and vents and look at them.

Now I understand why the master has to bring three rulers to work? Measure size not just by looking at numbers, but by taking all environment variables into consideration. I heard that the new generation of smart screens can automatically recognize the installation space, but we still have to practice the basic skills. Remember, the size difference is one centimeter, and it may take three more days to debug later!

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