and cheap VR displays. VR displays halve the screen into two, one for each eye. So a 2:1 VR screen would be halved into two 1:1 screens. Smartphones began moving to this aspect ratio since the late 2010s with the release of the Samsung Galaxy S8, advertised as 18:9.

Ultra-wide aspect ratios

21:9 is a consumer electronics (CE) marketing term to describe the ultra-widescreen aspect ratio of 64:27

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