This particular breakthrough hails from the efforts of researchers over at the Pusan National University in South Korea, where they have managed to come up with an advanced light shutter which is capable of rapidly switch between transparency and opaqueness, doing so in under a millisecond, and at the same time, paving the way for displays which will become transparent upon the moment where you flick a switch.
Majority of the transparent displays do rely on organic light emitting diodes (OLEDs), and these displays happen to be completely transparent when turned off, but will also remain as completely opaque when turned on, in order to ensure that what remains behind the screen will not end up compromising the overall picture quality. Not only that, these shutters also happen to consume extremely little power in order to work, which means the energy required is used to have it become opaque, and not when you want it to remain transparent. Future iterations will see a bistable version of the shutter being developed that will consume power only when it makes the switch between opaque and transparent, and this will definitely be one major step in ensuring that practical transparent displays become reality. [Press Release]