I picked 7 because it works nicely with hexagonal pixels. :-) But the primaries can be relatively close together in color. It’s fine if we have e.g. 2 reds, 2

I picked 7 because it works nicely with hexagonal pixels. :-) But the primaries can be relatively close together in color. It’s fine if we have e.g. 2 reds, 2 blues, and 3 greens instead of 1 of each. Or for an LCD, some of them could be broader-spectrum primaries which were brighter but less colorful, while others could be more intense narrow-spectrum primaries. This would make the display more color accurate for various observers (more robust against “observer metamerism”), and would make the display overall brighter for the same intensity of backlight. Or I dunno.. I’m not an expert in display technology, I’m sure the engineers could come up with many ideas.