Analysis of smartphone screen definition users: PPI and ppi2

We know that the screen size (in inches) of mobile phones on the market is getting bigger and bigger,

Yes, it is really cool to hold a big screen mobile phone in your hand. But if the screen size increases, will the user experience be satisfactory?

Of course not. User experience is also related to resolution.

 

Currently, the most common indicators for cell phone screen clarity are: PPI and DPI.

 

PPI:

The number of pixels per inch. Pixels per inch indicates the number of pixels per inch. The higher the PPI value, the higher the density of the display. Of course, the higher the display density, the higher the anthropomorphic degree.

 

DPI:

 

 

PPI (pixels per inch): image sampling rate (in the image, the number of pixels per inch) DPI (dots per inch): print resolution (the number of points that can be printed per inch, the relationship between the print size, the number of images, and the print resolution can be expressed using the following formula: the number of horizontal (vertical) Measures of the image = print horizontal (vertical) resolution X horizontal (vertical) Size of the print, number of horizontal (vertical) rows of the image/print horizontal (vertical) Resolution = horizontal (vertical) Size of the print. For a specific image, the number of dimensions of the image is fixed. Therefore, the print resolution is inversely proportional to the print size.

1 screen size (screen size) refers to the actual physical size of the mobile phone, such as 2.8 inch, 3.5 inch, and the screen size of the phone is 3.5 inch;

2 aspect ratio (width/height ratio) refers to the actual physical size, width/height ratio, divided into long and nolong, milestone is 16: 9, belongs to long;

3 Resolution (resolution) indicates the number of pixels in the portrait and horizontal directions of the mobile phone screen. The value of Moto xt701 is 854*480;

4 DPI (DOT per inch), number of pixels per inch, such as 120 DPI and 160dpi;

 

 

Based on the calculation methods of the above indicators, I have compiled the relevantProgramAnd evaluate the popular high-end mobile phones in the market.

It is worth mentioning that, according to the DPI formula, the calculated value is the number of pixel points in a unit size,

However, the mobile phone screen is a plane, so I introduced a metric named ddi2.

The calculation method is as follows:

Ddi2 = horizontal pixel points * vertical pixel points/(horizontal screen size * vertical screen size)

 

It indicates the number of pixel points in an area. Obviously, ddi2 is the square of DDI. However, its significance is more relevant to the measurement of user experience.

 

The specific experiment data is as follows:

 

From the data, we can see that Samsung's gs4 definition is unique.

Xiaomi's 2 S is slightly better than IP5.

 

This test also has some defects:

1: it is not associated with the screen size. The screen size will definitely affect the user's embodiment.

2: it is not associated with the price. Most users are most concerned about cost effectiveness.

 

However, we can see that pepper Q1 is more cost-effective.

 

This experiment is not intended to promote chilies. It only analyzes and learns screen definition indicators.

The screen definition of pepper is relatively cost-effective, but its other indicators are not evaluated. At the same time, the user needs further research on its durability.