Major technologies are CRT, LCD and its derivatives (Quantum dot display, LED backlit LCD, WLCD, OLCD), Plasma, and OLED and its derivatives (Transparent OLED, PMOLED, AMOLED).
The figure shows a sketch of how different technologies present a single white/grey frame.
Notice that some have a fixed intensity, while the illuminated period is variable.
It employs a transparent conductive oxide as a heater that can quickly change the pixels.
They claim that the metasurface array could replace the liquid crystal layer in today's displays, eliminating the need for production technology.