Could you clarify, what do you mean under term "Is it safe?". Safe for what or whom ?
From the point of health, we would know truth approximately in a couple decades if some1 find something bad about nowadays TV's(as it was with CRT TVs). To compare to the old CRT displays a new one TV with LED background light is way to much better since they don't generate X-Rays. There was some researches that says that a blue color emitted by LED kinda dangerous in a long term, but TV is device that trying to perfectly build correct white color by mixing Red,Green,Blue in ratio where blue light will be always has less level than red and of cause green(old formula for phosphorous pixels used in old CRT where white ratio of RGB is 3:6:1 doesn't work with LED based TV due to wide wavelength range of LED emitters but blue color is still lowest). As about pixels, if you stay far enough from TV so you can't recognize individual pixels then you are fine, you aren't tease your eyes.
If it was a question regarding your computer - if it safe for computer, then you already got the answer: "That is what it is made for". Well, it will use a little more energy to be able to drive two displays, but common, we paying for convenience. Than older we getting than more and more I find myself more comfortable to work in front of my 60" TV than 21" 4k display :)
You didn't bother mentioning what "safe" means. This is a poor quality question until that is fixed. – Bort – 2017-01-03T00:41:15.580
What sort of danger(s) are you concerned about? Visual strain? Issues with the computer and/or TV screen? Please expand on what you mean by "safe". – music2myear – 2017-01-05T16:49:33.357