A fairly simple and comparatively low cost way is to frame the TV behind a reflective glass called Mirropane. It's not as reflective as a mirror, is somewhat bronze in tone, but allows the TV image to be seen when the TV is on and acts like a mirror when the TV is off. Cost is about $15/sq. ft. and a local glass and mirror shop should have samples that you can take a look at.
I have supplied it for local audio-visual installers and it's a lot less expensive than the specialty products the TV vendors sell. You may have some issues if the sun can reach the glass or if the ambient light levels are too high in the room--it's usually done in bathrooms or less lighted areas. I hope this helps.
I have supplied it for local audio-visual installers and it's a lot less expensive than the specialty products the TV vendors sell. You may have some issues if the sun can reach the glass or if the ambient light levels are too high in the room--it's usually done in bathrooms or less lighted areas. I hope this helps.