I use a 43" 4k TV as a monitor and it's great. It's on the outside range of size due to the 100 ppi pitch. You're referring to chroma subsampling. Rtings does

I use a 43" 4k TV as a monitor and it's great. It's on the outside range of size due to the 100 ppi pitch. You're referring to chroma subsampling. Rtings does a review of 4k TVs that support 4:4:4 chroma. https://www.rtings.com/tv/reviews/best/by-usage/pc-monitor https://www.rtings.com/tv/reviews/best/by-usage/pc-monitor This page also has a link to their subsampling article.