ABSOLUTELY YES, as much or more then audio, imho. That is the thing I noticed most once I got a good Power conditioner. Even Better, after the conditioner, if your display has old lamp cord cable, replace it with cord upgrae. I have opened several TVs to install IEC and could tell the TVs were made fore iec and downgraded for cheap cord (often cut out is not there). If you don't want to open TV, I use a $5 adapter (I get from dedicated audio) that easily splices into old cord (no solder, a 10 minute surgery) and it adds UEC external from TV which is safer in terms of warrantee (I can't be sure on that). I promise that will give added improvement with a modest ($200) aftermarket cord. The 2 combined are amazing upgrade.
Ed
Ed