Complex sentence: A quantum dot display uses quantum dots (QD), or semiconductor nanocrystals, in a photo-emissive layer to improve efficiency of the backlight in LED-backlit LCDs, or potentially in electro-emissive displays with active pixels emitting light on their own.
Split into simpler sentences: A quantum dot display uses quantum dots (QD), or semiconductor nanocrystals. Quantum dots could be used in a photo-emissive layer to improve efficiency of the backlight in LED-backlit LCDs, or potentially in electro-emissive displays with active pixels emitting light on their own.