Screen sizes
Tablets and smartphones are equipped with screens with different aspect ratios and different pixel densities, but these parameters are rarely indicated in the technical specifications.
Let's try to deal with all the tricks associated with these parameters. Let's start with the tablets.
Here is the ratio of the size of the screens used in most modern tablets.
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Notice how visually the screen is 8 "with a 4: 3 aspect ratio visually larger than the wide screen 7". And the wide screen is 10.1 "per centimeter less than the screen 9.7" in height.
I tabulated the parameters of the screens most often used in tablets.
Text on screens with low PPI (dots per inch) does not read comfortably. I would not buy a tablet with a screen that has a PPI below 150. Even the 164 PPI of the iPad mini screen seems to many to be insufficient. Perfectly perceived screens with a PPI greater than 200.
For me it was a great discovery that the 9.7 "1024x768 screen has even less PPI than the 7" 800x480 screen.
Modern smartphones use screens with different aspect ratios (3: 2, 5: 3, 16: 9), but they are all pretty close. In the picture I illustrated the ratio of the sizes of screens with the same diagonal and different aspect ratios.
The table of screens used in smartphones looks impressive.
As can be seen from the table, there are quite a few screens with low PPI. Of course, you should not buy a smartphone with a screen that has a pixel density below 170 PPI. But again, it is better that this figure be above 200.
The vast majority of screens have a square pixel, so the aspect ratio of the screen can be calculated, knowing the number of points in width and height. There are only two exceptions - the “wrong” tablet screens with rectangular pixels — 800x480 (should have been 800x500) and 1024x600 (1024x640 would be correct).
I spent the evening creating these pictures and tables primarily for myself. I hope that they will be useful to you.
Tables in the excel file: nadezhin.ru/lj/ljfiles/screen.xls
upd .: Tables of permissions and ppi sets of devices: en.wikipedia.org/wiki/List_of_displays_by_pixel_density
Ppi calculator: members.ping.de/~sven/dpi.html .
Let's try to deal with all the tricks associated with these parameters. Let's start with the tablets.
Here is the ratio of the size of the screens used in most modern tablets.
')
Notice how visually the screen is 8 "with a 4: 3 aspect ratio visually larger than the wide screen 7". And the wide screen is 10.1 "per centimeter less than the screen 9.7" in height.
I tabulated the parameters of the screens most often used in tablets.
Text on screens with low PPI (dots per inch) does not read comfortably. I would not buy a tablet with a screen that has a PPI below 150. Even the 164 PPI of the iPad mini screen seems to many to be insufficient. Perfectly perceived screens with a PPI greater than 200.
For me it was a great discovery that the 9.7 "1024x768 screen has even less PPI than the 7" 800x480 screen.
Modern smartphones use screens with different aspect ratios (3: 2, 5: 3, 16: 9), but they are all pretty close. In the picture I illustrated the ratio of the sizes of screens with the same diagonal and different aspect ratios.
The table of screens used in smartphones looks impressive.
As can be seen from the table, there are quite a few screens with low PPI. Of course, you should not buy a smartphone with a screen that has a pixel density below 170 PPI. But again, it is better that this figure be above 200.
The vast majority of screens have a square pixel, so the aspect ratio of the screen can be calculated, knowing the number of points in width and height. There are only two exceptions - the “wrong” tablet screens with rectangular pixels — 800x480 (should have been 800x500) and 1024x600 (1024x640 would be correct).
I spent the evening creating these pictures and tables primarily for myself. I hope that they will be useful to you.
Tables in the excel file: nadezhin.ru/lj/ljfiles/screen.xls
upd .: Tables of permissions and ppi sets of devices: en.wikipedia.org/wiki/List_of_displays_by_pixel_density
Ppi calculator: members.ping.de/~sven/dpi.html .
Source: https://habr.com/ru/post/169141/
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