When games are talking about HD, that means high definition, right? If so then where do you get a HD PC monitor. I've never seen "19'' LCD HD monitor" ever...
Standard TVs are 640x480. Most PC monitors have a resolution of 1280x1024 which is HD but not full. Full HDTV is 1920x1080.
Remember that TV formats are much different than PCs. Look closely at them and your notice that an HDTV has lines running down it and PCs just have pixels.