A CDE Definition
The aspect ratio states the comparison of width to height and is commonly used to describe the shape of a TV or computer screen. For example, the aspect ratio of an earlier standard-definition (SD) screen was 4:3, which is a relatively square rectangle. The 4:3 means "4 to 3," or four units wide to three units high. Today's TVs and monitors typically have a 16:9 ratio, which is a wide rectangle that is still not as wide as most movie theater (cinema) screens.
Another way of expressing the 4:3 and 16:9 ratios is 1.33:1 and 1.78:1; however, these latter designations are used mostly for cinema formats, rather than TV (see illustration below). See letterbox, screen resolution, HDTV display modes and anamorphic DVD.
The 2.39:1 Is Also 2.4:1
The Letterbox Effect
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