2chnlben
Definitely with todays Digital Displays as all Flat panels are basically "DTV's" if you can get a copper ring on the IEC and its a standard WBT type IEC you use to make a custom connection/cable etc...Then what we are talking about above will work well, For sure this could be of some benefit right on your TV.. You can do it to both ends but seems the most important by concensus so far is doing the IEC at the Units input closest to the transformer.
Mostly everybody above is talking about on your DVD player, or Cable box, or Movie server I am sure could all benefit from an upgraded cable with this copper shielding being they are all based in the digital component realm. You could even keep your cheap belden IEC computer cables that come with the components and take one over to the hardware store and find some Copper to fit those as well, but they will NOT be the sizes above, they will be smaller, like 1" or 3/4" or something probably.
Beyond that I have not tried it on a TV display, I would accept mine has a Standard IEC but its RECESSED into the back and very difficult to get an IEC other than the standard generic cables to fit in there, also with a copper ring Definitely will not fit, but I could do it and may on the AC end at the wall.
Bottom line although some above argued it, I explained very Clearly that 1 1/4" couplers are tricky, THEY ARE THE EXACT correct size if the ID (Inner Diameter) is this size not the OD (outer Diameter), Only for WBT's and Wattgates which are made by the same manufacture MARINCO. Above somebody says a 1 1/4" coupler Hits and does not go over but just hits the insert, Yes and this is why He used standard Marked 1 1/4" couplers, you need to be careful and find the more rare it seems Reducer couplers, or get lucky and find a straight pipe with the REAL 1 1/4" ID. You can use the 1 1/2" and use some Blu tack or double side tape to make up the difference, but I prefer not to, it has a pretty good amount of space.
I had to custom cut some with the ID of the correct size and they fit directly on like the plug was made out of Copper, but this is probably not easy for most, so just buy the 1.5" and modify as you see fit to fill the gap.
Good Luck