2. The physical size of the display screen is usually expressed by the diagonal length of the visible image, usually in inches. According to the Pythagorean law of mathematics and the aspect ratio, how many planes are there per inch can be calculated;
3. Pixels per inch of the display screen refers to the PPI (Pixels per inch) standard, that is, the number of pixels that can be displayed per inch on the diagonal length of the display. For example, 300PPI means that on the diagonal length of the display screen, 300 pixels can be displayed per inch, and 10 inch is 3000 pixels;
4. The display resolution PPI is separated from the printing resolution DPI (dots per inch), which refers to the number of ink drops that can be printed per inch on the diagonal length. The essential concepts of DPI and PPI are the same. So every inch of pixels can be called PPI or DPI, and the standard name of display resolution is PPI;
5. The higher the 5.PPI, the higher the pixels per inch of the display screen, and the higher the accuracy of the displayed image.
6. In addition, the display resolution can also be expressed by the physical pixel size, such as 1920 x 1080, that is, the maximum number of physical pixels that can be displayed on long and short sides;
7. The total number of pixels and pixels per inch are two ways to express the resolution of the display screen, which are determined after the design of the display screen is completed and cannot be changed.