You might want to check this out as well: 4k-tv-as-monitor
The following is from the link that @jeff_rivers provided:
I am currently using a 49" 4K TV as my monitor. This is equivalent to a 2 x 2 grid of 24" FDH monitors.
The actual diagonal is 48.5 inches, resulting in 91 dpi. With the monitor a arms distance I find this easy to read with no DPI scaling. The screen is 23.78" high x 42.27" wide, allowing a full size preview of Arch D size drawings.
I use Display fusion to partition it into virtual monitors My "main" virtual monitor is a 2560 x 1440, 32" diagonal, portion of the screen. This about as large as I can comfortably work with. Other applications or floating AutoCAD Windows/Pallets can occupy the unused space. I mostly work standing so my "main" monitor is at the top. I admit that the monitors on the lower part of the screen are hard to read; temporarily, I either sit down, or drag lower monitor up to a better position.
If you are considering this, I suggest that you copy the attached "4K Monitor.png" file to a USB drive and take it to a big box store to view it on the actual TV you are consideing
I think I paid about $325 for a LG 49U6300 television.

Christopher Stevens
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