[Quoth]

OLED isn't LEDs in the normal sense. They are diode-like electroluminescent dots with phosphors, so the they are limited in brightness and and life. The phosphors age and suffer burn-in like CRTs.

Decent LCD screens don't have glowy blacks, uniess backlight is too bright. Cheaper ones have a lightpipe behind and only edge LEDs. Ones good in full sunlight have arrays of LEDs and some can vary these to off on large black areas.

Often people have the brightness on OLED or LCD too high.

Matte, non-reflective screens (like Nxtpaper) have existed for decades (even on CRTs) but are rare because shiny polished glass is cheaper. Gorilla glass and sapphire are very expensive to make matte.

QLED is the brightest screen for sun, or lowest power consumption LCD, because it uses real blue LEDs as the back light and instead of red, green and blue dots or stripes which dramanically dim the light (see Triton filtered eink!), there are red and green quantum dots that change blue to red and green. White LEDs are really blue to violet with a yellow phosphor. The cheaper "White" LED backlights (or edge lights on cheap panels) have a bluish or magenta caste. The colour changes with ages. So some Sony LCD panels use mixed red, green and blue backlights as this is more efficient (or brighter) and doesn't age.

There is actually no proper evidence that "blue" keeps you awake, it's the content that stimulates. Reflection is the commonest cause of headaches, followed by too bright. The peak white should only be the same or less than paper under the current ambient illumination.

Maybe three makers do non-reflective panels. TCL's Nxtpaper is the best and used withe OLED and LCD displays. TCL and Samsung are the two main QLED panel makers. You don't really need QLED on a TV, though that is were they are common, unless you only view in a very bright room.

Only rubbish LCD panels don't do decent blacks.