View source for 21:9 aspect ratio

{{Short description|Width (21) to height (9) aspect ratio}}
{{More citations needed|date=March 2023}}
{{about|the ultrawide aspect ratio of 64:27, known as "21:9"|other ultrawide aspect ratios|Ultrawide formats}}

"'''21:9'''" ("twenty-one by nine" or "twenty-one to nine") is a [[consumer electronics]] (CE) marketing term to describe the [[Ultrawide formats|ultrawide]] [[aspect ratio (image)|aspect ratio]] of 64:27 (2.{{overline|370}}:1 or 21.{{overline|3}}:9), designed to show films recorded in [[CinemaScope]] and equivalent modern [[anamorphic format]]s. The main benefit of this screen aspect ratio is 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 [[Fullscreen (aspect ratio)|4:3]] (SDTV) and [[16:9 aspect ratio|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.{{overline|3}}:1) scaling factor.

<math>\left(\tfrac{4}{3}\right)^1 = \tfrac{4}{3} = </math> SDTV

<math>\left(\tfrac{4}{3}\right)^2 = \tfrac{4}{3} \cdot \tfrac{4}{3} = \tfrac{16}{9} = </math> HDTV

<math>\left(\tfrac{4}{3}\right)^3 = \tfrac{4}{3} \cdot \tfrac{4}{3} \cdot \tfrac{4}{3} = \tfrac{64}{27} = </math> "21:9"

The term "21:9" was chosen as a marketing term, first used by Philips in January 2009.<ref>{{Cite web |url=http://cinematicviewingexperience.com/what-is-cinema.html |title=Cinematic Viewing Experience |access-date=2019-03-13 |archive-url=https://web.archive.org/web/20090118230419/http://cinematicviewingexperience.com/what-is-cinema.html |archive-date=2009-01-18 |url-status=dead }}</ref> Due to its common denominator, 21:9 is more relatable to 16:9, the aspect ratio of regular HDTVs, rather than the more accurate 64:27. If it actually were 21:9 (2.{{overline|3}}:1), the fraction could also be expressed in the reduced form as 7:3, relating to the 4:3 of standard-definition TVs.

Consumer TVs with this aspect ratio were manufactured mainly from 2010 to 2017. Due to it causing [[Pillarbox|pillarboxing]] with standard 16:9 content,<ref>{{cite web |url=https://www.rtings.com/tv/learn/what-is-the-aspect-ratio-4-3-16-9-21-9 |title=What is the Aspect Ratio? |last1=Demers |first1=Cedric |last2=Azzabi |first2=Mehdi |date=15 June 2017 |publisher=Rtings.com |access-date=2019-02-02}}</ref> and the resulting low consumer acceptance, this screen format has rarely been used since then.

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 (2.3{{overline|8}}:1 or 21.5:9) and 12:5 (2.4:1 or 21.6:9) in addition to 64:27. The wider screen provides advantages in multitasking as well as a more immersive gaming experience,<ref name="the219experience">{{cite web |url=https://pcmonitors.info/articles/the-219-2560-x-1080-experience/ |title=The 21:9 (2560 x 1080) Experience |last=Simmons |first=Adam |date=14 April 2016 |publisher=PCMonitors.info |access-date=2019-02-02}}</ref><ref name="2560x1080">{{cite web |last=Saha |first=Anirban |date=13 November 2021 |title=What is 2560×1080 Resolution |url=https://www.techotn.com/benq-mobiuz-ex2710u-review-4k-144hz-hdr-600/ |access-date=2021-11-13 |publisher=techbullish.com}}</ref> and [[Ultrawide formats|even wider screens]] with aspect ratios such as 32:9 (allowing for two 16:9 views side-by-side) are available. 21:9 phones also exist.

==Constant image height==
{{Unsourced section|date=March 2023}}
With content of different aspect ratios, adjustments have to be made when showing such content on a display with a fixed aspect ratio. To avoid loss of content (due to cropping) or distortions (due to stretching), horizontal or vertical bars of a uniform color, usually black to make them less noticeable, are added to adjust the image. With the black bars being unnoticed, this has the effect of a changing image size when switching content aspect ratios.

A 21:9 display is able to present all content up to 'Scope aspect ratios at equal height, with changing vertical bars to the left and right of the image. Note how the large center circle, representing the main image area, remains at a constant size on the 21:9 display, while it changes on the other two depending on the aspect ratio of the content.

[[File:Animated content 4x3 16x9 21x9.gif|Animation of various content on three types of displays]]

{| class="wikitable sortable"
|+
|-
!!! 4:3 content !! 16:9 content !! 21:9 content
|-
! 4:3 TV || 
[[File:Photo of content with 4x3 aspect ratio on 4x3 TV.jpg|4:3 content on 4:3 TV|238px]]
|| 
[[File:Photo of content with 16x9 aspect ratio on 4x3 TV.jpg|16:9 content on 4:3 TV|238px]]
|| 
[[File:Photo of content with 21x9 aspect ratio on 4x3 TV.jpg|21:9 content on 4:3 TV|238px]]
|-
! 16:9 TV || 
[[File:Photo of content with 4x3 aspect ratio on 16x9 TV.jpg|4:3 content on 16:9 TV|287px]]
|| 
[[File:Photo of content with 16x9 aspect ratio on 16x9 TV.jpg|16:9 content on 16:9 TV|287px]]
|| 
[[File:Photo of content with 21x9 aspect ratio on 16x9 TV.jpg|21:9 content on 16:9 TV|287px]]
|-
! 21:9 TV || 
[[File:Photo of content with 4x3 aspect ratio on 21x9 TV.jpg|4:3 content on 21:9 TV|287px]]
|| 
[[File:Photo of content with 16x9 aspect ratio on 21x9 TV.jpg|16:9 content on 21:9 TV|287px]]
|| 
[[File:Photo of content with 21x9 aspect ratio on 21x9 TV.jpg|21:9 content on 21:9 TV|287px]]
|}

==Motion picture film formats and 21:9 ==
The "21:9" digital format's aspect ratio of 64:27 (approx. 2.37:1) is positioned between the classical [[CinemaScope]] aspect ratio (1678:715, approx. 2.35:1) and the aspect ratio of modern [[Anamorphic format|anamorphic]] cinematic content (1024:429, approx. 2.39:1), matching both with only a slight deviation.<ref>{{cite web |title=Aspect Ratio & Screens - Cinemascope |date=5 January 2021 |url=https://cda-proav.asia/aspect-ratio-and-screens/ |access-date=17 April 2023}}</ref>

==Standardization==

===HDMI===
As of May 2013, video timings in this 64:27 aspect ratio are supported by the technical specification that defines video timings for the [[HDMI]] interface, [[CTA-861|CTA 861-F]]:<ref>{{Cite web |url=https://www.cta.tech/Research-Standards/Standards.aspx?cat=DTVInterface&Page=1 |title=Research & Standards - DTV Interface |access-date=2019-07-16 }}</ref>
* 1280×720p, [[Anamorphic widescreen|anamorphic]] [[pixel aspect ratio]] of 4:3
* 1680×720p, near-square pixel aspect ratio of 64:63
* 1920×1080p, anamorphic pixel aspect ratio of 4:3
* 2560×1080p, square pixel aspect ratio
* 3840×2160p, anamorphic pixel aspect ratio of 4:3
In November 2016, CTA (formerly CEA) published CTA-861-G<ref>{{Cite web |url=https://members.cta.tech/ctaPublicationDetails/?id=11016f33-3422-e811-90ce-0003ff528c1a |title=A DTV Profile for Uncompressed High Speed Digital Interfaces (CTA-861-G) |access-date=2019-07-16 }}</ref> with these additional video timings in 64:27, as well as additional frame rates (48&nbsp;Hz, 100/120&nbsp;Hz UHD):
* 5120×2160p, square pixel aspect ratio
* 7680×4320p, anamorphic pixel aspect ratio of 4:3
* 10240×4320p, square pixel aspect ratio
CTA-861-I,<ref>{{cite web |title=A DTV Profile for Uncompressed High Speed Digital Interfaces (ANSI/CTA-861-I) |url=https://shop.cta.tech/collections/standards/products/a-dtv-profile-for-uncompressed-high-speed-digital-interfaces-ansi-cta-861-i |website=Consumer Technology Association |access-date=29 March 2023 |language=en}}</ref> published in February 2023, provides a successor to the VIC enumeration of video timings, using a Resolution ID (RID) carried in Video Format Descriptors (VFDs). These VFDs support additional 21:9 resolutions of:
* 11520×6480p, anamorphic pixel aspect ratio of 4:3
* 15360×6480p, square pixel aspect ratio
* 15360×8640p, anamorphic pixel aspect ratio of 4:3
* 20480×8640p, square pixel aspect ratio

All of the above timings are supported at [[frame rate]]s of 23.97, 24, 25, 29.97, 30, 47.95, 48, 50, 59.94, 60, 100, 119.88, 120, 143.86, 144, 200, 239.76, 240, 300, 359.64, 360, 400, 479.52, and 480&nbsp;Hz, as of CTA-861-I.

===Blu-ray===
An effort by Panamorph in 2012 to add support for anamorphic video in a 21:9 aspect ratio to the Full HD, 3-D and Ultra HD [[Blu-ray Disc|Blu-ray]] specifications<ref>{{Cite web |url=https://www.avsforum.com/threads/anamorphic-encoded-blu-rays-on-the-horizon.1436729/post-22547410 |title=Anamorphic encoded Blu-Rays on the Horizon ! |date=2012-11-01 |access-date=2020-07-30 }}</ref><ref>{{Cite web |url=https://www.avsforum.com/threads/anamorphic-encoded-blu-rays-on-the-horizon.1436729/post-24246758 |title=Anamorphic encoded Blu-Rays on the Horizon ! |date=2014-01-21 |access-date=2020-07-30 }}</ref> was unsuccessful and ultimately did not get included into the final specification.<ref>{{Cite web |url=https://www.avsforum.com/threads/anamorphic-encoded-blu-rays-on-the-horizon.1436729/post-31293281 |title=Anamorphic encoded Blu-Rays on the Horizon ! |date=2015-01-29 |access-date=2020-07-30 }}</ref><ref>[http://av.watch.impress.co.jp/img/avw/docs/683/374/dg11.jpg Blu-ray Format Extension Video Characteristics]</ref> Blu-ray Discs include the letterbox bars in the encoded 16:9 picture, which means widescreen movies, without additional processing, will be shown with black bars on top and bottom. The company Folded Space, also initiated by Panamorph, was working on a proprietary solution, MFE,<ref>{{Cite web |url=http://www.prweb.com/releases/2012/5/prweb9512515.htm |archive-url=https://web.archive.org/web/20120520034642/http://www.prweb.com/releases/2012/5/prweb9512515.htm |url-status=dead |archive-date=May 20, 2012 |title=Folded Space Announces Blu-ray Disc Encoding Technology Providing up to 50% Greater Performance for Movies with Panoramic Aspect Ratios |date=2012-05-17 |access-date=2019-05-21 }}</ref><ref>{{Cite web |url=http://www.panamorph.com/folded-space/ |title=Folded Space&nbsp;– UltraWide Cinema by Panamorph |access-date=2015-03-02 |archive-url=https://web.archive.org/web/20150221215619/http://www.panamorph.com/folded-space/ |archive-date=2015-02-21 |url-status=dead }}</ref> to put anamorphic 21:9 video onto Blu-rays in a way compatible with standard players.

==Content and source devices==

===Blu-ray===
Some Blu-ray players, e.g., the Oppo BDP-203/205, or Philips BDP3200/12 and BDP9100/05, did support a 21:9 output mode.<ref>{{Cite web |url=https://www.oppodigital.com/blu-ray-udp-203/UDP203-firmware-50-0817B.aspx |title=OPPO UDP-20X 4K UHD Blu-ray Disc Player Firmware Update |access-date=2019-03-13 }}</ref><ref>{{Cite web |url=https://www.philips.co.uk/c-p/BDP3200_12/3000-series-blu-ray-disc-dvd-player |title=3000 series Blu-ray Disc/DVD player BDP3200/12 |access-date=2024-10-19 }}</ref><ref>{{Cite web |url=https://www.philips.co.uk/c-p/BDP9100_05/blu-ray-disc-player |title=Blu-ray Disc player BDP9100/05 |access-date=2024-10-19 }}</ref> In this mode, the player has the capability to trim the letterbox bars and extract the 21:9 center portion of the movie content of a letterboxed disc, upscale it vertically, and scale and re-arrange the 16:9 menus and subtitles for that 21:9 anamorphic upscale so that no user interface elements are trimmed off with the bars.

{| class="wikitable"
|+ Blu-ray subtitle shift for 21:9 display
|-
! Video and Subtitles stored on a Blu-ray !! 21:9 content extracted and upscaled, with subtitles shifted out of the cropped letterbox bars (anamorphic frame at video output) !! Anamorphic frame shown stretched on 21:9 display, now correct and with all subtitles
|- style="text-align: center;" 
| 
[[File:Afd sub 21x9 in 16x9.svg|21:9 content letterboxed in 16:9 frame, with subtitles|238px]]
|style="text-align: center;" | 
[[File:Afd sub 21x9 anamorph.svg|21:9 content in 16:9 anamorphic frame, with subtitles|238px]]
|style="text-align: center;" | 
[[File:Afd sub 21x9.svg|21:9 content in 21:9 frame, with subtitles|317px]]
|}

===Streaming services===
Video streaming and download services use a proprietary technical infrastructure, and are not confined to the same strict rules about frame aspect ratios as standardized distribution services (such as broadcast and optical discs). They therefore often encode content as just the active frame, without any aspect ratio adjustment bars (letterbox or pillarbox bars). Movies with a 2.39:1 aspect ratio are a natural match for 21:9 output video timings, as long as the streaming clients support such video modes, and even content with other wide aspect ratios such as 2.00:1 and 2.20:1 are inherently maximizing the use of the output frame on such systems.
[[Amazon Prime Video]], [[YouTube]], and [[Netflix]] support ultrawide movies/videos, while [[Tubi TV]], [[Disney+]], and [[Hulu]] still do not.<ref>{{Cite web |last=Le Grice |first=James |date=2022-09-13 |title=Stream Fullscreen Video On 21:9 Ultrawide (No Black Bars!) |url=https://productivemess.com/product-guides/monitors/stream-fullscreen-ultrawide/ |access-date=2022-09-20 |website=Productive Mess |language=en-us}}</ref>

===Apple TV===
[[Apple Inc.|Apple]], in September 2024, announced<ref>{{cite web |title=tvOS 18 is now available |url=https://www.apple.com/newsroom/2024/09/tvos-18-is-now-available/ |website=Apple Newsroom |publisher=Apple |access-date=29 September 2024}}</ref> upcoming support for 21:9 with tvOS 18 for the [[Apple TV]] streaming box: "Available later this year, tvOS 18 brings '''21:9 support''' for playing movies and shows on projectors, [...]"

Apple TV 4K (3rd generation, model A2737 and A2843) with tvOS 18.3 supports<ref>{{cite web |title=How do I change the aspect ratio? |url=https://www.reddit.com/r/appletv/comments/1hs2fd0/how_do_i_change_the_aspect_ratio/ |website=Reddit |access-date=4 February 2025}}</ref> the new feature, with the aspect ratio choices 16:9, '''21:9''', '''2.37:1''', 2.39:1, 2.40:1, DCI 4K, and 32:9.<ref>{{cite web |last1=Judge |first1=Sigmund |title=tvOS 8.2 Developer Beta 1 |url=https://x.com/sigjudge/status/1853538516803703066 |website=X |publisher=Twitter |access-date=10 November 2024}}</ref> This provides separate selections for 21:9 (presumably 7:3) and 2.37:1 (presumably 64:27). The exact scale ratios are still to be confirmed as of November 2024.

==Display devices==

===Flat-panel TV===
All Blu-ray Disc content with 1920 horizontal resolution has 1080 vertical resolution, though in the case of widescreen formats wider than 16:9, the image appears on 16:9 displays with [[letterboxing (filming)|letterboxing]]. [[Philips]]' "Cinema 21:9" TV eliminates the black bars by scaling the 1920 horizontal resolution to its full width of 2560 and the 800+ pixels of CinemaScope images (actual pixel counts vary)<ref>{{cite web |url=https://hometheaterreview.com/native-2351-projector-unveiled-by-avielo-optix |title=Native 2.35:1 Projector Unveiled By avielo optix |date=13 September 2010 |work=Home Theater Review |publisher=Luxury Publishing Group |access-date=2019-02-02}}</ref><ref>{{cite web |url=http://www.ilounge.com/index.php/articles/comments/the-complete-guide-to-itunes-movie-rentals-part-2 |title=The Complete Guide to iTunes Movie Rentals, Part 2 |last=Hollington |first=Jesse |date=18 February 2008 |publisher=iLounge |access-date=2019-02-02}}</ref> is scaled to 1080 with the black space [[cropped]]. The result is an image which fills the screen, but does not provide higher quality due to the use of [[image scaling|scaling]].<ref>{{cite web |url=http://www.digitalversus.com/philips-56pfl9954h-p460_5513_53.html |title=Philips 56PFL9954H |last=Lheur |first=Vincent |date=3 July 2009 |publisher=DigitalVersus |archive-url=https://web.archive.org/web/20100723023041/http://www.digitalversus.com/philips-56pfl9954h-p460_5513_53.html |archive-date=2010-07-23}}</ref> Despite the intention being to fill the screen with a non-letterboxed image, the zoom mode can result in some cropping at the edges.<ref name="whathifi">{{cite web |url=https://www.whathifi.com/philips/cinema-219-56pfl9954h/review |title=Philips Cinema 21:9 56PFL9954H review |date=7 July 2009 |work=What Hi-Fi? |publisher=Future Publishing |access-date=2019-02-02}}</ref> Content with the full image at 1920×1080 can be displayed in the center of the screen with [[pillarboxing]], and should the viewer choose to not display CinemaScope content at full width, it appears [[windowbox (film)|windowboxed]].

====Philips====
The [[Philips]] "Cinema 21:9" TV was the first [[LCD television]] of this aspect ratio.<ref>{{Cite web |url=http://www.newscenter.philips.com/in_en/standard/about/news/press/pressrelease_2010-12-10_219ledpro_launch.wpd |title=Philips launches World's First Cinema Proportion Full HD 3D LED Pro TV with Ambilight |access-date=2011-02-01 |archive-url=https://archive.today/20130104093053/http://www.newscenter.philips.com/in_en/standard/about/news/press/pressrelease_2010-12-10_219ledpro_launch.wpd |archive-date=2013-01-04 |url-status=dead }}</ref> The first model launched was a 56-inch screen size, although it was no taller than a conventional 16:9 42-inch television. Models released in 2010 and 2011 had screen sizes of 50 and 58 inches.

Early reviews claimed that it was "one of the coolest TVs" to enter the market for some time.<ref name="whathifi"/> This set was previewed in the UK in advance of its release date of 18 June 2009. Pre-release launch events were held at numerous Philips retailers throughout June 2009.

The online advertising campaign surrounding the Cinema 21:9, titled ''[[Carousel (advert)|Carousel]]'', went on to win the most prestigious award in the advertising industry, the Grand Prix at the [[Cannes Lions International Advertising Festival]].<ref>{{cite web |url=https://www.shots.net/news/article/65305/film-grand-prix-for-carousel |title=Film Grand Prix for Carousel |date=27 June 2009 |work=Shots |publisher=Media Business Insight |access-date=2009-09-22}}</ref>

In 2012, Philips stopped production on all its 21:9 televisions due to lack of demand.<ref>{{cite web |url=https://www.theverge.com/2012/8/28/3273716/philips-cinema-21-9-tvs-discontinued |title=Philips discontinuing super-wide Cinema 21:9 TVs due to lack of demand |last=Goddard |first=Louis |date=28 August 2012 |work=The Verge |publisher=Vox Media |access-date=2013-03-18}}</ref>

====Vizio====
[[Vizio]] followed Philips in 2011 with their own Cinema TVs with identical resolution, similarly marketed as "21:9" in the United States.<ref>{{cite web |url=https://www.engadget.com/2011/01/04/vizio-bringing-21-9-cinema-hdtv-to-ces-with-2560-x-1080-resoluti |title=Vizio bringing 21:9 Cinema HDTV to CES with 2560 x 1080 resolution, all our hopes and dreams |last=Miller |first=Paul |date=4 January 2011 |work=Engadget |publisher=Verizon Media |access-date=2019-02-02}}</ref><ref>{{cite web |url=http://www.vizio.com/news/VIZIOUnveilsUltraWidescreen219CinemawideHDTVLEDLCDsfortheUltimateCinematicExperience |title=VIZIO Unveils Ultra-Widescreen 21:9 Cinemawide HDTV LED LCDs for the Ultimate Cinematic Experience |date=5 January 2011 |publisher=Vizio |access-date=2019-02-02 |archive-url=https://web.archive.org/web/20110717202831/http://www.vizio.com/news/VIZIOUnveilsUltraWidescreen219CinemawideHDTVLEDLCDsfortheUltimateCinematicExperience |archive-date=2011-07-17}}</ref>

The 58-inch TV with a panel resolution of 2560×1080 was sold in 2012 and 2013, but was then discontinued. A planned 50-inch model never made it to market.

====Jupiter====
Jupiter Systems in California was first to launch a full line of 5K resolution 21:9 large LCDs named Pana for the enterprise market in 2020, with engineering development that traced back to 2018. They were touch and non-touch models, with screen sizes 105" and 81", as well as a 34" desktop.<ref>{{cite web |title=Pana 21:9 LCD |url=https://www.jupiter.com/displays/ |access-date=17 April 2023}}</ref> In 2021, Jupiter continued with its exclusive 21:9 product offering by launching an ultra fine pitch direct view MicroLED product line, starting with 0.7mm pitch at 165" through 1.2mm pitch at 281", all in 5K 21:9 configurations.

====LG====
[[LG]] has a number of monitors with panel resolutions of 2560x1080 (64:27), 3440x1440 (43:18), 3840x1600 (12:5) and 5120x2160 (64:27), the latter being advertised by LG as '5K2K' with a 21:9 aspect ratio.<ref>{{cite web |url=https://www.lg.com/us/ultrawide-monitors |title=21:9 UltraWide Monitors |publisher=LG |access-date=2019-02-02}}</ref>

Other monitor manufacturers, such as Acer, AOC, Asus, BenQ, Dell,<ref>{{cite web |url=https://www.alphr.com/dell/dell-ultrasharp-u2913wm/32154/dell-ultrasharp-u2913wm-review |title=Dell UltraSharp U2913WM review |last=Muller |first=Sasha |date=19 February 2013 |work=Alphr |publisher=Dennis Publishing |access-date=2019-02-02}}</ref> Gigabyte, HP, Iiyama, Lenovo, MSI, NEC, Philips, Samsung and Viewsonic, have since followed suit.

At the CES 2014, LG presented the 105UC9,<ref>{{cite web |url=https://www.engadget.com/2013/12/18/lg-105-inch-curved-uhd-tv-105ub9 |title=LG's 105-inch, 21:9 curved UHD TV is wide enough to be a tanning bed |last=Lai |first=Richard |date=18 December 2013 |work=Engadget |publisher=Verizon Media |access-date=2019-02-02}}</ref> a 105-inch curved LCD TV with a 5120×2160 panel, one of the first two [[Ultrawide formats|ultrawide]] 5K screens. LG started selling the TV in early 2015 for approx. $100,000<ref>{{cite web |url=https://www.lg.com/us/tvs/lg-105UC9-led-tv |title=LG 105UC9: 105 Class (104.6 Diagonal) UHD 4K Smart 3D Curved LED TV w/ webOS |publisher=LG USA |access-date=2019-02-02}}</ref> in the U.S., the only ultrawide TV in the market that year.

====Samsung====
Also at CES 2014, [[Samsung]] presented a 105-inch curved LCD TV<ref>{{cite web |url=https://www.engadget.com/2013/12/19/samsung-105-inch-ultra-hd-ultrawide-lcd-ces |title=Samsung has its own 105-inch, ultrawidescreen UHD TV to show at CES |last=Lawler |first=Richard |date=19 December 2013 |work=Engadget |publisher=Verizon Media |access-date=2019-02-02}}</ref> with 5120×2160 resolution as well, the other first UW5K 21:9 screen.

====BOE====
Chinese panel manufacturer BOE presented an Ultra-Wide 10K 21:9 TV with a resolution of 10240x4320 (UW10K) at the 2015 Display Week conference.<ref>{{cite web |url=https://www.flatpanelshd.com/news.php?subaction=showfull&id=1433489433 |title=TV with 10K resolution exhibited by Chinese BOE |last=Larsen |first=Rasmus |date=5 June 2015 |publisher=FlatpanelsHD |access-date=2019-02-02}}</ref>

===Front projection===
Wide screen projectors with a 16:9 aspect ratio can be converted to 21:9 by attaching a 4/3 horizontal stretch or vertical squeeze anamorphic lens. This will optically scale standard projection images with e.g. 1920×1080 (FullHD) or 3840×2160 (UHD) to a 21:9 aspect ratio. These lenses are manufactured by optical companies like Isco and Zeiss, and provided to the home theater market by companies such as Panamorph.<ref>{{Cite web |url=https://www.panamorph.com/ |title=Panamorph 4K/8K Cinema Format Home Theater Projector Lenses |access-date=2021-04-17 }}</ref>

DIY anamorphic lenses have been made with 2 or 4 triangular prisms.<ref>[https://www.avsforum.com/threads/just-got-my-french-prisms.889863/ AVS Forum: Just got my French Prisms]</ref>

Besides projectors outfitted with anamorphic lenses, Digital Projection,<ref>{{cite web |url=http://www.digitalprojection.com/ProjectorDetail/tabid/87/ProjectorId/222/Default.aspx |title=dVision Scope 1080p |publisher=Digital Projection |access-date=2019-02-02 |archive-url=https://web.archive.org/web/20130607124458/http://www.digitalprojection.com/ProjectorDetail/tabid/87/ProjectorId/222/Default.aspx |archive-date=2013-06-07}}</ref> Projection Design<ref>{{cite web |url=http://www.projectiondesign.com/products/f35-series |title=F35 series |publisher=Projection Design |access-date=2019-02-02 |archive-url=https://web.archive.org/web/20110609075732/http://www.projectiondesign.com/products/f35-series |archive-date=2011-06-09}}</ref> and Avielo<ref>{{cite web |url=http://www.avielo.com/product-optix-superwide235.html |title=optix superWide235 |publisher=Avielo |access-date=2019-02-02 |archive-url=https://web.archive.org/web/20110304162057/http://www.avielo.com/product-optix-superwide235.html |archive-date=2011-03-04}}</ref> have released projectors that utilise 2560x1080 pixels of a 2560×1440 [[Digital Light Processing|DLP]] chip with a spherical lens.

===Computer monitors===
While not primarily intended for cinematic content,<ref name="the219experience" /> computer displays have also made use of this and other wide aspect ratios, marketed as "21:9", to provide expanded desktop space. Common resolutions in the market are listed below:
{| class="wikitable"
|-
! Resolutions ||colspan=3| Aspect ratio
|-
| 2560×1080, 5120×2160, 7680×3240, 10240×4320 || 64:27 || 2.{{overline|370}} || {{frac|21|1|3}}:9
|-
| 3440×1440, 5160×2160, 6880×2880 || 43:18 || 2.3{{overline|8}} || {{frac|21|1|2}}:9
|-
| 1920×800, 2880×1200, 3840×1600, 4320×1800, 5760×2400, 7680×3200, 8640×3600 || 12:5 || 2.4 || {{frac|21|3|5}}:9
|}

The [[Ultrawide formats|ultrawide]] page states PC monitor aspect ratios outside the cinematic 2.35:1 to 2.40:1 range.

===Smartphones===
{{anchor|CinemaWide}}
[[File:BL40.jpg|thumb|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 Mobile|Sony]] launched their latest flagship device, the [[Sony Xperia 1|Xperia 1]], with the world's first 21:9 ultra-wide [[4K resolution|4K]] [[High dynamic range|HDR]]-enabled [[P-OLED|OLED]] (6.5") display in a smartphone. They have trademarked the name ''CinemaWide'' for use in their latest ultra-wide Xperia devices.<ref>{{cite web|url=https://www.gsmarena.com/sony_trademarks_cinemawide_display_for_xperia_xz4-news-35403.php|title=Sony trademarks "CinemaWide" display for Xperia XZ4|author=Ricky|date=6 February 2019|website=GSMArena}}</ref> It is not the first mobile device to use a 21:9 aspect ratio display; that recognition belongs to the [[LG New Chocolate (BL40)|LG New Chocolate]], released in 2009. It has a 4" [[Thin-film transistor|TFT]] display with a resolution of 345×800 pixels. The [[Samsung Galaxy Fold]] smartphone/tablet folding hybrid, with its 4.6" Super AMOLED cover display, and the Xperia 10 and 10 Plus are among the first modern devices with ultra-wide displays. [[Motorola Mobility|Motorola]] introduced two 21:9 smartphones in 2019, the One Vision in May<ref>{{Cite web|url=https://www.theverge.com/2019/5/15/18624750/motorola-one-vision-announced-pricing-specs-features|title=The Motorola One Vision has a 21:9 screen and looks less like an iPhone clone|work=[[The Verge]]|last=Welch|first=Chris|date=15 May 2019|access-date=15 May 2019}}</ref> and the One Action in August,<ref>{{Cite web|url=https://www.gsmarena.com/the_motorola_one_action_unveiled_with_an_wideangle_camera_219_screen-news-38711.php|title=The Motorola One Action unveiled with an ultrawide camera, 21:9 screen|website=GSMArena|date=15 August 2019|access-date=1 December 2019}}</ref> both with a 6.3" [[1080p|FHD+]] IPS LCD screen.

Note that both Motorola and Sony chose to use a screen resolution of 2520×1080, rather than the CE resolution of 2560×1080, as defined in CTA-861. This leads to the device to have a "true" 21:9 (7:3) Aspect Ratio, rather than the normal CE aspect ratio of 64:27. The Xperia 1 also has an odd aspect ratio of 320:137, and would have been able to meet 64:27 with a more even resolution of 3840×1620. Sony does not adhere to consumer standards, as with their [[Video projector|home theater projectors]] that feature a 4096×2160 [[4K resolution]], rather than the CE resolution of 3840×2160.<ref>{{cite web|url=https://www.sony.com/electronics/home-cinema-projectors/t/home-cinema-projectors|title=Home Theater Projectors}}</ref> 4096×2160 is a resolution only relevant in digital cinema ([[Digital Cinema Initiatives|DCI]]), where movie theater projectors feature this resolution with either letterboxed 4096×1716 or pillarboxed 3996×2160 content for "Scope" (2.39:1) and "Flat" (1.85:1) aspect ratios, respectively. The full panel aspect ratio of 256:135 is unfit for normal consumer content with a 16:9 container aspect ratio.

{| class="wikitable sortable collapsible" data-sort-type="number"
|-
!scope="col" | Device
!scope="col" | Display specs 
!scope="col" | Resolution (px&nbsp;×&nbsp;px)
!scope="col" | Density (ppi)
|-
| [[LG New Chocolate (BL40)]] || 4-inch HVGA TFT LCD || 345 × 800 || 217
|-
| [[Sony Xperia L4]] || 6.2-inch HD+ IPS LCD || 720 × 1680 || 295
|-
| [[Sony Xperia 1]], [[Sony Xperia 1 II|II]], [[Sony Xperia 1 III|III]], [[Sony Xperia 1 IV|IV]], [[Sony Xperia 1 V|V]] || 6.5-inch 4K OLED || 1644 × 3840 || 643
|-
| [[Sony Xperia 5]], [[Sony Xperia 5 II|II]], [[Sony Xperia 5 III|III]], [[Sony Xperia 5 IV|IV]], V, 10 V || 6.1-inch Full HD+ OLED || 1080 × 2520 || 449 
|-
| [[Sony Xperia 10]] || 6.0-inch Full HD+ IPS LCD || 1080 × 2520 || 457
|-
| [[Sony Xperia 10 II]], [[Sony Xperia 10 III|III]], [[Sony Xperia 10 IV|IV]] || 6.0-inch Full HD+ OLED || 1080 × 2520 || 457
|-
| [[Sony Xperia 10|Sony Xperia 10 Plus]] || 6.5-inch Full HD+ IPS LCD || 1080 × 2520 || 422
|-
| Meizu 20 Infinity, 21 Pro || 6.8-inch AMOLED || 1368 × 3192 || 511
|-
| [[Motorola One|Motorola One Vision, Action]] || 6.3-inch Full HD+ IPS LCD || 1080 × 2520 || 435
|-
| [[Moto G 5G Plus|Motorola One 5G]], Moto G100  || 6.7-inch Full HD+ IPS LCD || 1080 × 2520 || 409
|-
| Oppo Find N2 Flip, N3 Flip || 6.8-inch Full HD+ AMOLED || 1080 × 2520 || 403
|}

==See also==
* [[Display aspect ratio]]
* [[Ultrawide formats]]

==References==
{{reflist}}

==External links==
* [http://www.philips.co.uk Philips UK]

{{Philips}}

[[Category:Philips|Cinema 21:9 TV]]
[[Category:High-definition television]]
[[Category:Picture aspect ratios]]