It's my understanding that component video goes up to 1080i, and can't do 1080p. I can also see where this might be hard to detect on a 1080p flat panel display, because flat panel displays don't interlace. Ever. So when they see a 1080i incoming signal, they automatically convert it to 1080p so they can display it. If a 1080p display receives a genuine 1080p signal, there should be some improvement in tracking fast-moving action, however.
The only true 1080i displays are CRT-based, whether a direct-view tube or CRT-based front or rear projector. All DLP, LCD, and plasma-based displays are progressive.
For example, my LCD-based rear-projection Hitachi will accept a 1080i signal, but the TV's native mode is 720p, and it downconverts a 1080i signal to a 720p display.
The only true 1080i displays are CRT-based, whether a direct-view tube or CRT-based front or rear projector. All DLP, LCD, and plasma-based displays are progressive.
For example, my LCD-based rear-projection Hitachi will accept a 1080i signal, but the TV's native mode is 720p, and it downconverts a 1080i signal to a 720p display.