Cutting-edge LCD TVs like the TCL 8 series use mini-LED and QLED to improve picture quality but they're still not as good as OLED. Sarah Tew/CNET ...

OLED shares similarities with both LED and LCD technologies. Unbelievable Technology OLED TV screens are approximately 3/16" thick, and that includes the front glass and back substrate.

In current LED, OLED and microLED production, if a defect is discovered, say on a piece of OLED glass, that entire surface will be disposed of, adding to the production costs.