Televisions always have width/height ratio of 3:4 or 9:16. Why these numbers and not, say, 1:2 (which is very close to 9:16)?
The original 4:3 ratio was chosen to match that of the Academy Ratio, used in cinemas at the time, but when digital television came around, people started using 16:9, to match most widescreen movie aspect ratios, which go from 1.66:1 through 1.85:1, and up to 2.35:1.
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The original 4;3 (or 1.33:1) ratio was chosen for technical reasons, because it was the optimal ratio for the width of the film that was being used at that time. This ratio was eventually chosen as the standard, and when televisions appeared it was logical to have the screen conform to the standard.
the 16:9 ratio is actually a compromise. It allows the viewer to watch wider screen movies in a wide screen while still displaying 4:3 pictures. It is not coincidence that 16:9 is actually 4 squared : 3 squared
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