The VIZIO M43-C1 has a maximum display resolution of 4K Ultra HD. That's over four times the display resolution of the most frequently found HD type of Full HD. 4K Ultra HD TVs have a resolution of 3840 x 2160 pixels.
This TV's display resolution (4K Ultra HD) is actually the best display resolution across all mid-size TVs that have been around for around the same time as the M43-C1.
An HD Ready HD type is the worst display resolution amongst similar types of TV.
4K Ultra HD TVs have a resolution of 3840 x 2160 pixels.