What is ppi pixel density?

When talking about a product with a sharp screen, people often refer to pixel density. So what is pixel density? What role does it play for a display when it comes to display? DienmayXANH.com will talk more about this issue.

What is pixel density?

In printing, people refer to pixel density as dpi (dots per inch), which means the number of dots on a surface with a diagonal of 1 inch. In terms of the display field of the screen, the pixel density is denoted by ppi (pixels per inch), ie the number of pixels contained in the screen with a diagonal of 1 inch. Here, we will only consider the ppi pixel density of the screen.

Each pixel (pixel) is composed of 3 main colors red – blue – green and so on arranged next to each other in each column and row. The pixel density of ppi will be calculated based on a surface with a diagonal of 1 inch equivalent to 2.54 cm.

What role does ppi pixel density play for the screen?

Basically, the more pixels on a PC screen are arranged and crammed on, the smoother and sharper the display will be. Also, if considered on the same screen size, a device with a higher resolution will lead to a higher pixel density leading to a sharper and clearer display. Today, mobile manufacturers are constantly improving the resolution and it is now up to 2K, which means that the pixel density increases to a very high number maybe more than 500 ppi, typically like : 515 ppi on Samsung Galaxy Note 4, 534 ppi on LG G3.

The formula for calculating pixel density

Pixel density is closely related and directly proportional to the resolution of the screen.

For example, considering a screen with a resolution of 1440 x 2560 on a 5.7-inch Samsung Galaxy Note 4, we will have 1440 columns of pixels and 2560 lines of pixels. The formula for calculating pixel density is as follows:

Total number of pixels across the screen diagonal length of 5.7 inches = Square root of the sum of squares of columns and squares of rows.

Here we have:

Pixel density of some mobile devices

Pixel density of some high-end phones:

Sony Xperia Z3: 424 ppi, Lumia 930: 441, Samsung Galaxy Alpha: 312 ppi, Nokia Lumia 1520: 367 ppi.

Pixel density of some cheap phones such as: Asus Zenfone 5: 294 ppi, Lumia 630: 221 ppi, Samsung Galaxy Grand Prime: 220 ppi…

The pixel density of the iPhone 4S is 330 ppi, the pixel density of the iPhone 5S is 326 ppi, the pixel density of the iPhone 6 is 326 ppi, and the iPhone 6 Plus is 401 ppi (These quantities are referred to by Apple as the display). Retina).

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What is the screen resolution?

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