This is an old post but it does explain it somewhat:
https://www.engadget.com/2007/08/20/does-your-hdtv-support-1-1-pixel-mapping/
But basically - TVs often "fudge" things when they display broadcast signals. The pixel-for-pixel (which is what Sceptre calls it, others may call it differently) takes VGA signal and just displays it exactly one to one. I am using two of those 32" Sceptre TVs as my monitors, VGA-connected, in that mode and the picture is crisp, no blurriness at all, they work perfectly well. And where else can you get a 32" monitor for $170?