Question

The correct expression of pixel density in LED display is ( )

A. P10 10000 dots/m2

B. P10 6944 dots/m2

C. P16 4096 dots/m2

D. P16 3906 dots/m2

Answer 1

Answer: A. P10 10000 dots/m²

Answer analysis:

In LED display screens, pixel density is an important parameter, which indicates the number of pixels per unit area. 

The calculation of pixel density is usually related to the pixel pitch (P value). 

The pixel pitch refers to the distance between two adjacent pixels, and the unit is usually millimeter (mm).

For a given pixel pitch P, we can calculate the pixel density (in dots/square meter) by the following formula:

Pixel density = 1/(P×10⁻³)²×10⁶

Here, P×10⁻³ is to convert the pixel pitch from millimeters to meters, and then square it to get the area of ​​a single pixel (square meter). 

Finally, multiply by 10⁶ to convert the unit from "1/square meter" to "dots/square meter".

Now, we calculate the pixel density of each option according to this formula:

A. P10 10000 dots/m²

Use the formula to calculate the pixel density of P10:

Pixel density = 1/(10×10⁻³)²​×10⁶=10000 dots/m²

It matches the value given in option A, but we need to continue to verify other options.

B. P10 6944 dots/m²

The pixel density of P10 calculated using the formula should be 10000 dots/m², which is inconsistent with the 6944 dots/m² given in option B, so B is wrong.

C. P16 4096 dots/m²

Use the formula to calculate the pixel density of P16:

Pixel density = 1/(16×10⁻³)²×10⁶=3906.25 dots/m2

It does not match the 4096 dots/m² given in option C, so C is wrong.

D. P16 3906 dots/m²

The pixel density of P16 calculated using the formula matches the value given in option D, which is 3906 dots/m², but we already know that option A is also correct, so we need to confirm which is the correct answer required by the question.

However, according to the requirements of the question and common understanding, we only need to find a correct pixel density expression. 

Since option A (P10 10000 dots/m²) is exactly the same as the result calculated by the formula, and there is no other information indicating that an answer closer to a specific value needs to be selected, we can determine that option A is correct.

Therefore, the answer is: A.