Xiaomi's 100 million pixels don't look so clear. Why is this?

Your idea is wrong. The number of pixels does not determine the sharpness of a photo.

When the photo size is fixed, the more pixels, the clearer it is, which is the concept of ordinary people.

The pixel size must be, the more pixels, the bigger the picture.

The size of pixels is limited by technology and human resolution. Can't be infinitely small. The normal resolution of the human eye is about 300 pixels per inch, which is the retinal resolution. This is almost the size of a hair.

According to this calculation, the human eye can see 2 million pixels at a distance of 30 cm. You can try to find a flat panel (HD level) about 10 inch to see if your eyes can distinguish pixels. If you can't see it, there are no more pixels.