Hmm I'm not an expert here but IMO the wording is just marketing jargon. Most important thing is to look at the supported resolutions. Could be that "hd ready" supports 720p while hdtv is 1080p or more. Not really sure, but either way when looking at monitors, you should look at getting one that supports higher resolutions (1920x1080 is great), has 5ms response or better, and ideally a high contrast ratio like 40,000:1 or better.