The QD-OLED technology promises to lower production costs by three times and improve color gamut along with light output over conventional OLEDs. Samsung has been against the adoption of OLEDs in large screen devices for over 5 years now, but the QD-OLED technology somehow changed the company's perspective, as it plans to heavily invest in OLED panels and eventually convert most of its LCD lines into OLED.
https://www.notebookcheck.net/Samsung-invests-US-11-billion-in-QD-OLED-facilities-promises-to-drastically-reduce-OLED-panel-production-costs.439805.0.html