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| Philips Cinema 21:9 TV ： ウィキペディア英語版 |
21:9 aspect ratio
21:9 (2.3:1) is the approximated screen aspect ratio of the true value 64:27 (2.:1) in comparison to the common ratio of 16:9 (1.7:1). It is designed to show films recorded in CinemaScope or the modern anamorphic format of 2.39:1. The main benefit of this screen ratio 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 is the logical extension of the existing video aspect ratios 4:3 and 16:9, as it is the third power of 4:3, where 16:9 of traditional HDTV is 4:3 squared. This allows electronic scalers to use an easily implementable 4:3 (1.3:1) scaling factor.
The term "21:9" was chosen as a marketing term, probably first used by Philips. 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 21:9. If it actually were 21:9, the fraction could be expressed more elegantly in the reduced form as 7:3.
==Constant height==
A 21:9 TV allows to display all content at equal height, allowing for a more balanced viewing experience.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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