I think the picture Samsung provided for the QLED vs. OLED light technology is funny and a bit misleading: they make the two look the same, with both having a light source, color filter, and display. But that's really only true for QLED. In OLED (and AMOLED and the upcoming MicroLED), the LED's are the source of the color and the light, that's why they have such great viewing angles and perfect blacks: there is no separate color filter layer between the light and person viewing.
Other than cost, the real downside to OLED and AMOLED compared with QLED (which is really just an LCD technology with really good LED backlighting) is the organic nature of the LED's, which does degrade over time. That is also indirectly related to what currently limits their brightness, as compromises are made to give them a reasonable many-year life. MicroLED is the solution to that negative, and will therefore be able to provide the total brightness and resistance to screen burn-in of LCD with the color and contrast power of OLED.
Can't wait for MicroLED to become mainstream but given that virtually nothing uses them yet (Samsung has some super high-end, small production run TV's), and it will probably take a few years for costs to come down, we're probably still several years from that. But to be clear, MicroLED is not some laboratory-only technology that sounds great but may never reach consumers. It's being scaled for consumer manufacturing now. It's the real deal and it's coming to all of us soon.
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