1. Formula to calculate Length and Height

Distance between Pixels × Number of dots = Length (Height)

There we list two cases:

Case 1:

Module length P16 = 16 (dots) × 1.6cm = 25.6cm

Height of Module P16 = 8 (number of dots) × 1.6cm = 12.8cm

Case 2:

Length of Module P10 = 32 (dots) × 1.0cm = 32cm

Height of Module P10 = 16 (dots) × 1.0cm = 16cm

2. Formula to calculate viewing distance of LED screen

The viewing distance can be the appropriate distance at which you can clearly see the images on the LED screen. Basically, we have minimum viewing distance, optimal viewing distance and maximum viewing distance, and we list the calculation here. However, it is worth noting that the exact viewing distance is related not only to the pixel pitch, but also to the total size of the LED display and the specific condition.

(1) Minimum viewing distance (provide a smooth image)

Pixel Pitch (mm) × 1000/1000 = Minimum viewing distance (m)

For example, a LED screen of size P.10mm has a minimum viewing distance of 10 meters and a screen of size 20mm has a minimum viewing distance of 20 meters.

(2) Optimal viewing distance (provide HD images)

Pixel Pitch (mm) × 3000/1000 = Optimal viewing distance (m)

The optimal distance is three times longer than the minimum viewing distance.

(3) Maximum viewing distance

Height × 30 = Maximum viewing distance (m)

For example, a 2m high LED screen can be observed from 60 meters away.

3. Formula for calculating resolution

Resolution per square meter = 1 / pixel pitch (m) / pixel pitch (m)

For example, resolution of LED display P16 = 1 / 0.016 / 0.016 = 3906 points /

You can easily understand that there is an inverse correlation between pixel pitch and resolution, that is, the smaller the pixel pitch, the higher the resolution and the better the image quality.

4. Distance between LEDs

The distance between LEDs measures the distance from a pixel point to a neighboring pixel and can be understood simply. For example, the spacing distance of P16 LED display module is 16mm, for P20 module is 20mm, and that of P12 LED display module is 12mm.

5. Scan mode

Before we calculate this parameter, let's clarify some scan mode definitions . In a certain display area, the ratio between the number of lines of light simultaneously to the number of lines in the entire area is called the scan mode.

There are basically  two scanning modes, they are static scan and dynamic scan .

If  the drive circuit lights up every pixel  of the LED display every time, this scanning mode  is called static scan mode  .

And if the  lighting is intermittent  , for example, there are 1, 2, 3, 4, 5, 6, 7, 8 rows of pixel dots on the screen, and the steering wheel lights up only 1 and 3 rows at the beginning of the time, removes them and brightens 3.5 rows in a very short time – this is what we call  dynamic scan  , which is lower in brightness than static scan but can reduce power consumption.

For example, if the pixel for the full color LED display module is 16×8 (2R1G1B) and a 16-bit MBI5026 is used for the drive, there will be 512/16 = 32.

(1) If 32 MBI5026 chips are used, it is a static scan;

(2) If 16 chip MBI5026, it is 1/2 dynamic scan;

(3) If 8 chip MBI5026, it is 1/4 dynamic scan.

6. Number of LED display modules

(1) Total Area Length of Module Height of Module = Number of LED Modules

Case 1:

For 10 square meters of P16mm LED display, the number of LED screens should be:

10㎡ 0.256m (length) 0.128m (width) = 305,17678 pcs 305 pcs

(2) For a more precise calculation:

Number of modules for length × Number of modules for height = Total number of modules

Case 2:

Number of LED modules for length euqals up to 5m ÷ 0.256m (length of LED module ) = 19.53125pcs ≈ 20pcs

Number of LED modules for euqals height up to 2m 0.128m (height of LED module ) = 15.625 16pcs

So total LED module is 20pcs × 16pcs = 320pcs

7. How to calculate brightness

For P16 LED display panel with 2R1G1B LED beads and 1/4 scan mode, there are 3906 points per square meter. If the brightness of  the red LED, green LED and blue LED are 800mcd, 2300mcd and 350mcd separately  , then the brightness per square meter should be:

(800 × 2 + 2300 + 350) × 3906/1000/4 = 4150cd /

The formulas for calculating pixel brightness are (  2R1G1B  ):

(1) Brightness for red LED: Brightness per square meter / Dots per square meter × 0.3 / 2

(2) Brightness for green LED: Brightness per square meter / Dots per square meter × 0.6

(3) Brightness for blue LED: Brightness per square meter / Dots per square meter × 0.1

For example, the LED module has 2500 points per square meter, 2R1G1B and the brightness should be 5000 cd/㎡:

Brightness of red LED: 5000 2500 × 0.3 2 = 0.3

Brightness of green LED: 5000 2500 × 0.6 2 = 1.2

Brightness of blue LED: 5000 2500 × 0.1 = 0.2

The brightness of each pixel is: 0.3 × 2 + 1.2 + 0.2 = 2.0cd

Conclusion

This article introduces some of the most practical calculation formulas of LED display including how to calculate distance, length and height, number of LED display modules you will need, scan mode, brightness , resolution and viewing distance. They are all basic knowledge and you can understand them well if you read this article carefully.

TOP DIGITAL