A window display fights two things at once. The daylight outside is far brighter than anything a normal panel emits, and the glass itself traps heat, which is where cheaper panels turn grey and start to darken from the edges in.
Our window line answers both. Brightness runs from 2500 to 5000 nit depending on the size, and the panel uses the M+ structure so it stays black where it should be black even when the glass behind it is warm. A light sensor tracks the ambient level so the display is not sitting at maximum output on an overcast morning.