End of the Bulb

You can tell that new <DOCTOR.WHO> is just days away and my fan-boy gene is turned up to eleven 'cause when I see a story like this:

Researchers working on organic light-emitting devices (OLEDs) have made a critical jump that could finally call lights out time for the humble bulb.
Since OLEDs are transparent when switched off, the prospect is of whole surfaces like walls, windows, or even curtains flooding rooms with brilliant white light.

I think "roundels, anyone"*

*(this will only make sense to the likewise afflicted)