As outlined above, QD-OLED combines OLEDs (Organic Light-Emitting Diodes) with Quantum Dots in an effort to combine the best aspects of both: essentially the perfect blacks and flawless contrast provided by the self-emissive properties of the former with the colour vibrancy of the latter.
It's early days for the technology but the world's first QD-OLED TV – the Sony A95K – suggests that while QD-OLED isn't a huge leap forwards, it is capable of adding more detailed shading and colour vibrancy to the brightest parts of an image. At this stage, we wouldn't suggest opting for a QD-OLED simply because it's a QD-OLED as there are so many other factors that contribute to a winning TV, but it certainly seems capable of brilliance and has the potential to get even better.