I know that 3d active shutter glasses work with infared or radio wavew. I know that both of them are harmfull but,
with either of them, the glasses and the source (monitor) communicate one time just to get in sync, or they communicate constantly?
A communication for a second or a couple of seconds is tottaly acceptable, no complains, but constant communication is bad.
After contancting a company that makes active shutter glasses and chatting in another forum, they told me that the glasses and the source must communicate constantly because two independent oscilators can never be in sync; even if you synchronize once, they will get out of sync in just a few seconds. In order to do this the monitors and the glasses must have temperature-controled oscilators, which are expensive and big at size.
While there might be a handshake to begin to send, the glasses only need a timing pulse sent to them, there is no need to send information back from the glasses.
Infrared leds of the small size output a tiny bit of infrared,just like a remote control. Bluetooth unlike a cellphone communication is not a very strong radio signal, the design is for very short range operation, so it is a very low power. To get to a cell tower requires much more power. So while i would not discount the existance of an effect, it would be much smaller than many other things.
