The aspect ratios of current tablet displays
|Device||Size||Normalized aspect ratio|
|Apple iPad mini||768px × 1024px||96 × 128|
|Apple iPad||1536px × 2048px||96 × 128|
|Google Nexus 7||800px × 1280px||87.636 × 140.217|
|Google Nexus 10||1600px × 2560px||87.636 × 140.217|
|Microsoft Surface||768px × 1366px||83.118 × 147.838|
|TV||3:4||96 × 128|
|DVD||9:16||83.138 × 147.802|
|1:2.39||71.704 × 171.372|
|Letter||8.5in × 11in||97.444 × 126.104|
|A4||210mm × 297mm||93.212 × 131.828|
The last column shows the aspect ratio normalized to an area of 12288 (96 times 128). That is, all areas in that columns are the same, only the sides of the rectangles are different. The formula for the factor n with which the sides have to be multiplied is:
The rectangles look as follows.
|Tablet display aspect ratios|
|Film aspect ratios|
|Paper aspect ratios|
Is there a perfect aspect ratio?Current tablets are optimized for different applications:
|Watching movies on the iPad|
- Among the tablets covered here, the iPad works best in portrait orientation. Its display has the “widest” aspect ratio of all tablets. That aspect ratio is the same as those of XGA displays and TVs. It is also close to Letter paper. Note that the Kindle Paperwhite that is clearly optimized for being used in portrait orientation, has the same display aspect ratio as the iPad (768 × 1024 pixels). Alas, the iPad works less well for movies where black bars mean that you lose quite a bit of display space.
- The Surface works best for watching movies. Its resolution (between 1365 × 768 and 1366 × 768.375) is almost 16:9, the aspect ratio of DVDs and many notebook screens.
- The Nexus is situated between the extremes iPad and Surface. It is less elongated than 16:9.