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21:9 movies usually refers to 1024:429 ≈ 2.387, the aspect ratio of digital ultrawide cinema formats, which is often rounded up to 2.39:1 or 2.4:1 Ultrawide resolution can also be described by its height, such as "UW 1080" and "1080p ultrawide" both stands for the same 2560×1080 resolution.
Ultra-Wide QHD LG, Samsung, Acer, HP and Dell UltraWide monitors ... Ultra-Wide 4K: Sony Xperia 1, Sony Xperia 1 II, ... 4K UHD-1 4K Ultra HD 1:2160p, 4000-lines ...
There are other, non-standard display resolutions with 1080 lines whose aspect ratios fall between the usual 16∶9 and the ultra-wide 64∶27, e.g. 18∶9, 18.5∶9, 19∶9 and 19.5∶9. They are mostly used in smartphones or phablets and do not have established names, but may be subsumed under the umbrella term ultra-wide (full) HD.
The LG New Chocolate (BL40) was the first mobile device with a 21:9 aspect ratio, using a 4-inch TFT display. On February 25, 2019, Sony launched their latest flagship device, the Xperia 1, with the world's first 21:9 ultra-wide 4K HDR-enabled OLED (6.5") display in a smartphone.
This is the resolution of the UHDTV1 format defined in SMPTE ST 2036–1, [15] as well as the 4K UHDTV format defined by ITU-R in Rec. 2020, [16] and is also the minimum resolution for CEA's definition of Ultra HD displays and projectors. [21]
Some panels advertise a resolution only slightly smaller than the native, such as 1360×765. For these panels to be able to show a pixel perfect image, the EDID data must be ignored by the display driver or the driver must correctly interpret the DTD and be able to resolve resolutions whose size is not divisible by 8.
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