Like said Mini LED isn't any different monitor type.
It's LCD with just different backlight allowing control of backlight brightness in actual segments instead of huge blotches of edge illumination.
But unlike others it is at least actually existing in production tech.
Though Covid related issues have delayed also them.
(like Acer X32 FP)
Micro LED, which is truly different display tech combining self emissive pixels to durability by using pixel sized inorganic LEDs is still like five years away at best.
The only issue? No manufacturer has them in their mass production development roadmap yet. The manufacturing process is still super expensive, which is only made worse by low manufacturing yields.
We’ve seen some prototypes of smart watches at the show, as well as an examples of a rollable display using micro-LED technology. But if it’s difficult and expensive to manufacture these smaller screens made up of thousands of micro-LEDs, you can imagine the challenge of manufacturing a monitor panel made up of millions.
There are no clear dates yet from any of the manufacturers. Based on our conversations with multiple micro-LED suppliers, we don’t expect mass-produced micro-LED monitors to hit the market until 2026-2028..
https://eve.community/t/exciting-monitor-trends-and-panels-found-at-display-week/35236
As for OLED, I haven't yet seen monitor sized high refresh rate 4K panel in any released current schedule.
LG has apparently some serious brightness (leading to endurance) issue in shrinking organic LEDs to size needed for 4K monitors:
Finally, we learned that at high pixel densities, the organic LEDs become so small that they no longer emit enough light to create a feasible image. This means that, at least for now, high resolutions are only possible on larger screens. In the near future, don’t expect to see 4K on an OLED screen smaller than 40 inches.
https://eve.community/t/exciting-monitor-trends-and-panels-found-at-display-week/35236
With 120Hz 4K OLED TVs common and affordable for already many years have suspected something like that.
LG's OLED monitors actually use panels from JOLED made by different manufacturing process and even they have only retro 60Hz panels in roadmap.
That might be also reason why Samsung didn't make monitor sized high end 4K panel, which would have sold like second coming of Jesus even at higher price.
Despite of naming, QD-OLED still uses standard blue OLED as energy source for quantum dot filter.
QD filter simply just absorpts incoming light from blue OLED and then emit that energy at its particle size dependant wavelength.
So if there's issue in shrinking OLED pixel size, it's likely still there at some level.
Also quantum dot filter might be hard to make for small pixels...
