The highest display resolution of the TX-48AX630 is 4K Ultra HD. That's over four times the display resolution of a Full HD TV, which is the most common display resolution. 4K Ultra HD TVs have a resolution of 3840 x 2160 pixels.
This television's display resolution (4K Ultra HD) is in fact the best display resolution amongst all TVs of a similar spec and age to the TX-48AX630.
The worst display resolution amongst comparable types of television is HD Ready.
4K Ultra HD TVs have a resolution of 3840 x 2160 pixels.
It may also be worth also looking at one of the other 4K Ultra HD TVs currently available including the 40UF7707, or the 49UF640 (£489.99) both from LG which is cheaper.