Prior to the publication of these standards, it was sometimes casually referred to as 'QFHD' (Quad Full HD). It is also the minimum resolution requirement for CEA's definition of an Ultra HD display. To avoid storing the eight lines of padded pixels, some people prefer to encode video at 624 × 352, which only has one stored padded line.ģ840 × 2160 was chosen as the resolution of the UHDTV1 format defined in SMPTE ST 2036-1, as well as the 4K UHDTV system defined in and the UHD-1 broadcast standard from. The same is true for qHD and 1080p but the relative amount of padding is more for lower resolutions such as nHD. H.264 codecs have this padding and cropping ability built-in as standard. Video frames encoded with 16×16 pixel macroblocks would be padded to 640 × 368 and the added pixels would be cropped away at playback. One drawback of this resolution is that the vertical resolution is not an even multiple of 16, which is a common size for. Pixel doubling (vertically and horizontally) nHD frames will form one 720p frame and pixel tripling nHD frames will form one 1080p frame.
One consequence of this transition was that the highest available resolutions moved generally downward (i.e., the move from 1920 × 1200 laptop displays to 1920 × 1080 displays). By 2011, the 16:10 aspect ratio had virtually disappeared from the Windows laptop display market (although Mac laptops are still mostly 16:10, including the 2880 × 1800 15' Retina MacBook Pro and the 2560 × 1600 13' Retina MacBook Pro). In this time frame, with the notable exception of Apple, almost all desktop, laptop, and display manufacturers gradually moved to promoting only 16:9 aspect ratio displays. The computer display industry maintained the 16:10 aspect ratio longer than the entertainment industry, but in the 2005–2010 period, computers were increasingly marketed as dual use products, with uses in the traditional computer applications, but also as means of viewing entertainment content.
In 2014, '21:9' screens with pixel dimensions of 3440 × 1440 (actual aspect ratio 43:18 or 2.3 8) became available as well.
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