I went to http://www.lg.com/uk/monitors/lg-28MT49S to check it out. While it will accept 1080 input the TV has to throw out pixels to fit and use what screen pixels there are. The result will look bad.
Here's a Wikipedia about Native Resolution: https://en.wikipedia.org/wiki/Native_resolution
I got a LG 28MT49S and I'm using it as a monitor for my PC, connected via HDMI to an nvidia GTX 760. The thing will only look good in 1360x768, it's native resolution, but I want to use it in 1920x1080. When I try changing the resolution to 1920x1080, the image looks blurred and I can't read anything.
I also tried another TV I have (that I know is 1080p) and it also looks horrible. Before that, I used an old AOC monitor that worked alright in 1920x1080. What do I have to do to use that resolution?