https://www.cnet.com/news/how-quantum-dots-could-challenge-oled-for-best-tv-picture/

Sure they have similar names, down to the little slash that makes an "O" into a "Q," but according to CNET's tests for picture quality, OLED is superior. It's also fundamentally different from the LCD-based TVs that comprise the vast majority of the market today. Samsung's latest QLED TVs are still based on LCD, and while they have their strengths, they can't compete with OLED.

The "Q" in QLED, however, could change the game a few years down the road. It stands for quantum dot, a microscopic particle that could have a big impact on TV image quality. Samsung and other TV makers are working on technologies beyond QLED that could finally ditch LCD, and potentially challenge the picture quality dominance of OLED.