I have been using a 4K television as a computer monitor for several weeks now. I picked up the 50 inch television from BestBuy at $330 plus tax. It is Hisense brand, obviously one of the cheaper brands.
I am searching for a reason to pay more for a computer monitor. I have yet to find it. I did get some feedback once that perhaps using cheap processing inside the television was cause to purchase a more expensive brand. The person who gave me the information cited pixel by pixel color-space processing of the image as it is displayed, and that using a cheap brand TV likely meant that the supplier went with a cheaper processor so as to reduce the cost of real time massage of the image for things like color, tint, sharpness controls. The suggestion was that original image at Y:Cb:Cr of 4:4:4 would reduce quality to a ratio of 4:2:2 or even 4:2:0.
So I went out and located a test image, otherwise known as torture image to test for 4:4:4 image degradation to 4:2:2 during pixel by pixel image processing in the TV. In fact, if there are any serious color losses from original image on display array in PC, through HDMI to television, and during processing of image in TV prior to displaying on the acutal screen, this image is designed to illuminate those problems. The image is an HD image, so its size is 1920X1080. It should fit perfectly on an HD screen, and should cover exactly 1/4 of a 4k screen. When blown up to full size (1/4 screen) on a 4k monitor or TV, or full size on any monitor (I use old school Paint at 100%), the image should show artifacts in the letters as there are many transitions from fully on to fully off/vice versa for the various colors.
When I first displayed this image on my new 4k screen, I was horribly disappointed with all of the artifacts displayed by this torture image. You could clearly see the distortion that the loss in chromiance information had inflicted upon my monitor picture. And since this concern was brought to my attention by a fellow techie, I wanted to give a good answer. So I fiddled with the display to see what I could figure out. And it was right about the time I was considering getting one of those $50 android display computers when I realized that its not gonna help to put another computer in series, the problem is the processing inline between the computer and actual screen.
And then I started considering removing the computer in back of the TV, and placing the improved computer there. But how would the connections to the actual display look? And how much power does it need? I am going to have to act as a TV maker to solve this one. Maybe I should have just bought a better TV. It was then that I tried 'game' mode. And the torture image happened to be up at the time. I was pleased to see the delay when I switched into that mode, but even more pleased when I saw the improvement in the torture image. Check it out below...