Newbie question. I'm looking at buying a Mitsu diamond series projection TV. When I picked up their 2002 catalog, I noticed that on the back panel for the WS-65908 model, next to one of their component video inputs, there are two additional RCA jacks labeled H and V---the label on the back panel reads (GRBHV). What's this all about? Is this some sort of new HD-video input that surpasses component?