[kragen]

Thanks! This work is really inspiring! Are these OLED screens, matrices of separate LEDs of the usual InGaAs and GaN type, or LCDs backlit with LEDs? The 2.84 mm pixel pitch makes it sound like it's separate inorganic LEDs.

Are there times short of sunshine where you need more directionality to the lighting than the screens can provide? Because the screens can emit from any direction but not toward any direction, being quasi-Lambertian emitters.

[marcan_42]

Discrete LED screens go all the way down to 2mm or even 1.9mm pitch (I have a few 2mm tiles at home). These are certainly discrete LED panels, not OLEDs. I'm not aware of OLEDs being used in "wall" applications like this.

When you hear LED walls, think millions of discrete LEDs mounted on PCBs (and thank China for making this low cost enough to be viable!)

[jweather]

LED video walls are down in the 0.7mm dot pitch vicinity. Not quite the ~0.3mm of a 4K 55" LCD, but we're getting there. And the brightness and contrast ratio can't be beat.

[kragen]

In this case, 106 168 320 discrete LEDs, if we assume RGB and believe the 12288×2160 + 4096×2160 figure in the article; or 35 389 440 discrete LEDs if we count each (presumably RGB) pixel as a single unit, or if they're using a Bayer-pattern screen like PenTile AMOLEDs.

[canada_dry]

> low cost enough

The article doesn't mention cost, but I'm expecting it was in the $5-10M range. Anyone have actual figures for this type of hi-res, hi-lumen hi-refresh LED screen?