Huh? Your Sharp HDTV should be able to handle the DirecTV video OUT using Component or HDMI just fine. I'm not aware of any HDTV that ONLY accepts [email protected]
That's probably the HDTV's "native resolution" of its display, but it can convert other formats connected to its video inputs.
In fact, if you're using Component Video cables, you're not passing 1080p. That's only possible via HDMI.