The calculation formula for P1.25 LED display mainly involves pixel density, total number of pixels, and calculation based on screen size and resolution.
However, the calculation directly for the specific dot pitch (pixel pitch) of P1.25 is mainly based on its definition and physical size.
1. Pixel density calculation
Pixel density (Pixels Per Inch, PPI or Pixels Per Meter, PPM) is a measure of the clarity of the display. For P1.25 LED display, its pixel density (in PPM) can be calculated by the following formula:
Pixel density (PPM) = 1000000/(1.25×1.25)
But here we are more commonly used to express PPM, that is, the number of pixels per square meter, so the formula is simplified to:
Pixel density (PPM) = (1000/1.25)^2
The calculation result is:
Pixel density (PPM) = 640000
This means that there are 640,000 pixels on a 1 square meter P1.25 LED display.
2. Calculation of total number of pixels
To calculate the total number of pixels of a P1.25 LED display of a specific size, you need to know the length (L, unit: mm) and width (W, unit: mm) of the display. Then, use the following formula:
Total number of pixels = (L/1.25) × (W/1.25)
Here, L and W are the actual size of the display (length × width), in millimeters.
3. Relationship between resolution and size
Although the word "resolution" in LED displays does not directly correspond to a specific pixel size (such as 1920x1080) as in LCD monitors, you can understand the "resolution" of a P1.25 LED display as the number of pixels in the horizontal and vertical directions at a given screen size. Therefore, the calculation of resolution is actually the calculation of the total number of pixels, but we usually express it in the form of "width × height".
Example
Suppose there is a P1.25 LED display with a size of 3 meters wide × 2 meters high (i.e. 3000mm × 2000mm). Then, its total number of pixels and "resolution" are:
Total number of pixels = (3000/1.25) × (2000/1.25) = 4800000
"Resolution" can be expressed as:
Resolution = 3840 (horizontal pixels) × 1280 (vertical pixels)
Note: The 3840 and 1280 here are obtained by dividing the actual size by the dot pitch and rounding to the nearest integer, but in actual applications, the resolution of LED displays may not always correspond to integer pixel values so accurately because their pixel arrangement may be more flexible. However, in order to simplify calculations and understanding, we usually express it this way.