Essentially, LCD suppliers have hit the ceiling when it comes to what the displays can offer, and all R&D funding is going towards newer, self-emissive displays.
LED-LCDs differ from traditional LCDs as they use light-emitting diodes (LEDs) for backlighting rather than cold cathode fluorescent tubes.
This allows for higher contrasts, slimmer displays, a wider colour gamut, and lower power consumption. According to Tom’s Guide, LED-LCDs will continue to be produced and could see prices drop.
It will probably be much like the transition from CRT to LCD, as the price-points converge, the big adoption just takes over.
See https://mybroadband.co.za/news/gadgets/496983-beginning-of-the-end-for-lcd-tvs.html