As far as I understand it, Samsung's dilemma was sourcing high yield manufacturers with suitable quality control, especially for their mid and premium range panels. Sharp did formerly supply that need.
Looking forward the emerging issue for Korean electronics companies will be the Chinese advances developing their own proprietary technology, helped along by the numerous new factories being built in China.
Well known companies like TCL and Hisense will be selling comparable quantum dot tech to saturate the mid range market before too long.