##### Vizio OLED H1 TV Review

Jaron Schneider

Vizio OLED H1 TV Review

"21:9" ("twenty-one by nine") is a consumer electronics (CE) marketing term to describe the ultrawide aspect ratio of 64:27 (2.370:1), designed to show films recorded in CinemaScope and equivalent modern anamorphic formats. The main benefit of this screen aspect ratio, compared to the more common 16:9, is the absence of the black bars at the top and bottom of the screen when viewing content in this format, and a constant display height when displaying other content with a lesser aspect ratio.

The 64:27 aspect ratio of "21:9" is an extension of the existing video aspect ratios 4:3 (SDTV) and 16:9 (HDTV), as it is the third power of 4:3, where 16:9 of traditional HDTV is 4:3 squared. This allows electronic scalers and optical anamorphic lenses to use an easily implementable 4:3 (1.33:1) scaling factor.

${\displaystyle {\tfrac {4}{3}}^{1}={\tfrac {4}{3}}=}$ SDTV

${\displaystyle {\tfrac {4}{3}}^{2}={\tfrac {4}{3}}\cdot {\tfrac {4}{3}}={\tfrac {16}{9}}=}$ HDTV

${\displaystyle {\tfrac {4}{3}}^{3}={\tfrac {4}{3}}\cdot {\tfrac {4}{3}}\cdot {\tfrac {4}{3}}={\tfrac {64}{27}}=}$ "21:9"

The term "21:9" was chosen as a marketing term, first used by Philips in January 2009.[1] Due to its common denominator, 21:9 is more relatable to 16:9, the aspect ratio of regular HDTVs, rather than the correct 64:27 or 21${\displaystyle {\tfrac {1}{3}}}$:9. If it actually were 21:9 (2.33:1), the fraction could also be expressed in the reduced form as 7:3, relating to the 4:3 of standard-definition TVs.

As of 2017, this ratio is rarely used in TVs, due to it causing pillarboxing with standard 16:9 content.[2]

It is still prevalent in projection systems, using anamorphic lenses, and supported by a number of consumer electronics devices, including Blu-ray players and video scalers.

It is also used in computer monitors, where the term "21:9" can represent aspect ratios of 43:18 and 12:5 in addition to 64:27. The wider screen provides advantages in multitasking as well as a more immersive gaming experience.[3]

1. ^ "Cinematic Viewing Experience". Archived from the original on 2009-01-18. Retrieved 2019-03-13.
2. ^ Demers, Cedric; Azzabi, Mehdi (15 June 2017). "What is the Aspect Ratio?". Rtings.com. Retrieved 2019-02-02.
3. ^ Simmons, Adam (14 April 2016). "The 21:9 (2560 x 1080) Experience". PCMonitors.info. Retrieved 2019-02-02.