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By square, the question probably refers to the 4 : 3 aspect ratio that all televisions used until the 1990s. The move towards wide screen (16 wide by 9 high) has been going on for about 20 years. Europe was the first region to adopt the 16 : 9 format with most standard definition television production using it by about 2000. North America on the other hand made no moves towards the wide format until HD television was introduced.

Standard definition television signals can be formatted in either widescreen or standard format but HD content is only produced in 16 : 9 format. HD production is now becoming the norm throughout the television world. This is a global standard for HD so there is no prospect of television reverting to the 4 : 3 format.

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15y ago

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