I own a Panny 3LCD RPTV (Not the new Lifi)

Wondering the difference between an LCD RPTV and a DLP.

That's kind of a broad question; they are very different rear projection technologies. IMO, DLP and LCOS are the RP technologies to look at currently, not RP LCD, but the only thing that matters is what looks best to your eyes. Go to the stores, see what features you like and which PQ looks best to you, rather than worrying about technical differences between them.