Disconnect the electronics...
from the display panel and have very thin wires running to it and it will disappear even more. I wonder how it would work in a very bright room with a colorful wall behind it, would you be able to see the wall behind or does it actually get 100% opaque when on? Personally, I like the idea of having the TV disappear into a cabinet or the painting in front of it more than a see through TV, seems gimmicky.