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How to choose the right screen size

Is your telly too small - or too big - for HD?

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Is Full HD really necessary?

As well as asking BBC staff how far they sat from their TV sets, the researchers ran a second set of tests to determine how much detail the human eye can resolve. This was done with a series of test images, and methodology that’s described in some detail in the whitepaper.

Essentially, it involved comparisons between series of filtered and unfiltered images, and the result was broadly in line with the accepted figure of one minute of arc - 1.054, to be precise.

In fact, the BBC research wasn’t strictly concerned with viewing distance, but with what quality of image needed to be broadcast, based on the ability of the eye to discern detail, at the median viewing distance of 2.7m (8.9ft). And the results are quite surprising:

Spotting the Detail
Picture resolution vs screen size

TV Size vs Resolution

Plot resolution (vertical axis) against screen size and, at an average distance of 2.7m, viewers can't see the difference between 1080p and 720p for the most common TVs
Source: BBC

For the vast majority of viewers, a resolution of 1280 x 720 - 720p - will be sufficient for screen sizes of up to 50 inches diagonal, while 1440 x 1080 may suffice 50-56in screens – a figure that may perhaps influence the decision to broadcast some BBC HD services with a horizontal resolution of 1440 rather than 1920 pixels, though it's also to do with maintaining a 4:3 aspect ratio - which contains an anamorphic picture that stretched to the correct dimensions by a widescreen telly.

And if you’re one of those who feels that you’re being short-changed by the picture quality on some channels, or perhaps someone who simply can’t see what all the fuss is about, a second set of results shows the proportion of people in the test who required a specific standard.

At sizes of 35-40in, it seems that up to around 15 per cent per cent of people will notice a higher quality than 720p, though the proportion noticing anything better than 1440 x 1080 doesn’t increase beyond 15 per cent until screen sizes exceed 45in.

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Next page: The maths bit

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Whitepapers

Forging a new future with identity relationship management
Learn about ForgeRock's next generation IRM platform and how it is designed to empower CEOS's and enterprises to engage with consumers.
Storage capacity and performance optimization at Mizuno USA
Mizuno USA turn to Tegile storage technology to solve both their SAN and backup issues.
The next step in data security
With recent increased privacy concerns and computers becoming more powerful, the chance of hackers being able to crack smaller-sized RSA keys increases.
Security for virtualized datacentres
Legacy security solutions are inefficient due to the architectural differences between physical and virtual environments.
A strategic approach to identity relationship management
ForgeRock commissioned Forrester to evaluate companies’ IAM practices and requirements when it comes to customer-facing scenarios versus employee-facing ones.