Although they might sound the same, both of these TVs are different. QLED stands for Quantum Light-Emitting Diode which means these TVs are close to LED TVs. The only difference is that it uses tiny nanoparticles which are known as quantum. These particles are the reason why you get the brightness and colour that you do with the QLED. Even after this the Tv still uses LED lights hence the name QLED. Whereas OLED stands for Organic Light-Emitting Diode. Even if this might sound the same but it isn't as these TV use LED but not as a backlight as QLED. But in a way that there is thin and tiny LED which forms each pixel in the TV. Which produces its own light as also gives off the colour all in one. So, for any darker scenes, the OLED simply doesn't turn on some of the LED light while the QLED dims the lights. This makes OLED TV much more flexible.