1. The physical dimension of the screen,  if the screen is to install outside of a pillar or column, the perimeter of the outer arch must be measured, if the screen is to built like a ribbon shape, the radius of the arch must be decided.

Especially for this type of spiral ribbon, there are more measurement items and design is complicated.

1. The screen is designed to surround a column with diameter 1000 mm, 5000 mm high

2. Build a metal strucutre with inner diamater d= 1000 mm, thickness 200mm, outer diamater D = 1000 + 200x2 = 1400 mm presumably, the entire perimeter of the cylinder L =  Pi D = 3.14x1400 = 4398mm

3. The flex module we use measures 240 mm wide 120 mm high, horizontally there will be 4398/240 = 18.3 pcs 

4. We can't do 18.3 pcs modules, we must  go either 18 or 19 pcs

5. If 18 pcs, the perimeter will be 18x240 = 4320 mm, correspondingly, the revised D=L/Pi = 4320/3.14 = 1375 mm; similiarly with 19 pcs modules, the revised D = 19x240/3.14 = 1451 mm

6. Likewise, the vertial number of modules is decided by height of the column / height of module, which is 5000/120 = 41.6 pcs, we may choose 41 pcs, with 41 pcs modules, the total height of the screen 41x120 = 4920 mm,  the remaining 5000 -4920 = 80 mm will not be covered by module, however, this part can be placed at the bottom covered by siding, unnoticeable. 

7. So we choose the structure diamters 1000 mm inner 1375  outer, total module 18x41 = 738 pcs

8. Each module maximum power consumption is 15W, so total power is 738 x15 = 11,070W, if the power supply we choose is 200W  nominal output, with discount it to 80% output, the number of power supply is 11070/(200x80%) = 70 pcs

9. The number of receiving cards depends on the load capacity of the card and resolution of the modules, varies case by case

Finalization of the screen

There will be some redundancy on the vertical side, the modules can't touch the ground for safety considerations.