Ideally, it will have a setting called Resolution Scaling (sometimes ... 1,920 by 1,080 (1080p), 2,560 by 1,440 (1440p), and 3,840 by 2,160 (4K). By creating a few custom resolutions in between ...
you're getting a 4K TV. We've long since passed the point where it made economic sense to make large 1080p panels at scale anymore, so even if you're looking for a budget TV, any living room or ...