When active shutter* TVs are running in 3D mode they're at 2x the frame rate. So cutting the refresh rate in half gets you back to the base rate.


*Passive 3D displays show both frames at the same time, so wouldn't matter there either.

Pioneer PDP-5020FD, Marantz SR6011
Axiom M5HP, VP160HP, QS8
Sony PS4, surround backs
-Chris