what is component video upconversion

HDMI output, but no HDMI input on TV/What about Upconversion?
I may seem ignorant on new technology, but here it goes. I have an HDMI output on my HD-DVD, and a HDMI input/output on my receiver. But I have no HDMI input on my TV (it’s about 6 years old, so it’s ancient in the technology world). I can connect via HDMI cable to the receiver to get “HD” sound (or whatever you want to call the sound output). And I suppose I can use component cables to get a pretty good video. But don’t I loose the upconversion benefits with respect to normal DVDs of the HD-DVD player w/o HDMI? Is there anyway to take the video signal from my receiver to the TV beside component input? I don’t think my TV even has a DVI input. Am I basically SOL on the upconversion benefits here?
Edit to add that I have an HDTV set, not a standard one. It can go up to 540p/1080i. So upconversion would have some benefit.
You will lose upconversion benefits on prerecorded DVDs, because the industry has mandated hardware limits that prevent such upconverting players from outputting a 720/1080 signal through the component out.
Discs that aren’t protected should upconvert just fine to 1080i.
Denon AVR-2309CI Receiver w/ HDMI switching & video upconversion – AVR2309CI

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