4K upscaling: everything you need to know about how TVs turn HD into 4K

A woman plays games with FreeSync on her LG CX

4K TVs are everywhere – and they’re getting bigger and better. Over the past few years, there’s been a resolution revolution as Full HD TVs have become virtually extinct to usher in the new era of TV tech and many improved 4K TVs.

4K might have been a cutting-edge new TV tech a few years ago, but now 4K TVs are well and truly mainstream, accounting for nearly 50 per cent of all TVs shipped worldwide. Each has a resolution of 3,840 X 2,160 pixels, which equates to eight megapixels. That’s so much more detailed than the paltry two megapixels offered by Full HD TVs.

So why are some 4K TVs so thoroughly underwhelming?