What is 4K TV?

With rapidly falling prices and big names like Sky and Netflix on board, 4K Ultra HD TVs are fast becoming the norm. Learn about the technology in our guide…

The best TVs from the likes of Samsung, Sony and LG are all now 4K Ultra HD televisions. These are fast replacing HD models as the TV of choice in our living rooms. Sky and Netflix are geared up for 4K, and you can now buy a 4K TV for under £500.

But what exactly is 4K? Read on…


How does 4K TV work?  

To get better picture quality, you need a TV screen made up of more pixels. The number of pixels is measured in the screen resolution. 

HD TVs have a screen resolution of 2 million pixels, whereas 4K TVs have a resolution of 8.3 million pixels. This means they offer you 4 times the detail of a HDTV.4K resolution

How will it look better than my HD TV?

Your picture will be packed with detail and have more depth on a 4K TV, compared to your Full HD set. It’ll be much sharper too, and have a wider range of colours.

The razor-sharp picture on 4K screens puts HD TVs far in the shade. And the bigger the screen you choose, the more noticeable the improvement. 

High dynamic range, also known as HDR, features on many of the latest 4K UHD TVs. This gives you better contrast and more vibrant colours. HDR can highlight tiny, nuanced changes in shade, giving you detailed shadows and sensationally bright scenes.

What is HDR TV?

Some 4K TVs combine the above with quantum dots, a tiny layer of crystals added to the screen to further improve colour and brightness.   


What can I watch on my 4K TV?

Loads. Sky Cinema, Sky Sports, Netflix and Amazon Prime all have decent amounts of 4K content – provided you have the right subscription package for each TV service. Most 4K TVs have apps for Netflix and Amazon Prime built in, too. 

Football fan? Watch the 2017/18 season in style on Sky Sports – over 120 games will be shown in Ultra HD with up to 4 times the detail of HD. To watch Sky in Ultra HD you need the right Sky Q box and package.

Sky Q: Everything you need to know

It’s not just the football either. There’s something for everyone in the family to watch in 4K TV. Your favourite shows and movies look sensational.

Box-set binger? Netflix offers big hitters like Stranger Things, A Series of Unfortunate Events and The Crown in 4K.

Adventurer? The Grand Tour with Clarkson and co is on Amazon Prime in 4K, while Sky has David Attenborough documentaries.

Movie lover? Spectre and The Martian are among the films you can enjoy on Sky Cinema, while Ultra HD Blu-ray delivers an incredible experience for real home cinema enthusiasts.

And the 4K offering is growing all the time. Invest in a 4K model now and you’ll have a TV that’s future-proofed for years to come.

Don’t forget: To watch Sky in 4K Ultra HD you need the new Sky Q 2TB box with multiscreen subscription

What else can I watch on my 4K TV?


And when I’m watching BBC One and ITV?

You won’t always be watching 4K, but terrestrial channels like BBC 1 or ITV also look better than on your current television.

That’s because your 4K TV will upscale it to be much sharper, using its built-in processing engine. So you’ll still get greater depth and more vibrant colours.

The benefits of upscaling are most clearly seen with HD channels like BBC One HD and ITV HD.

Tip: It’s worth investing in a more expensive TV with a better processing engine if you want better upscaling.


What is Ultra HD premium?

The latest high-end 4K Ultra HD TVs have an Ultra HD Premium sticker to show they meet certain criteria.

They include minimum requirements for resolution, colour bit depth, colour gamut (the range of colours it can show) and high dynamic range (HDR).Watching 4K TV

The idea is if you see an Ultra HD Premium logo on a TV, you know it’s future-proofed to give you the best possible 4K experience

The standards were created by the UHD Alliance - a group made up of names like Samsung, LG, Panasonic, Netflix, Walt Disney and 20th Century Fox.


Is now a good time to buy a 4K UHD TV?

There’s not been a better time to buy a 4K UHD TV – says our large screen TV buyer, Daler Bhaker.

‘You have more choice, the prices are coming down,’ he explains.

You can now buy a 4K UHD TV for under £500, with 40-inch screen sizes available for smaller rooms, for example.

‘If you buy a 4K TV today you’re only going to reap the benefits more and more as time goes on and more content becomes available,’ says Daler.

And with the likes of LG, Samsung, Sony and Panasonic all getting on board with their own 4K ranges, you know you’ll be buying into the future of TV technology

Find the right 4K TV for you