VIZIO 43” 4K Home Theater Display

Could this be used as a computer monitor?

Sure, just need to hook up the PC’s HDMI connection to the display. If your PC doesn’t include an HDMI, you will have a more difficult time making it work.

Also know that you’ll need to have a HDMI 2.0 port on your computer to get 4k resolution at a decent refresh rate over HDMI.