[yig]

Two adjustable wavelength emitters should be sufficient, right? So the picking-and-placing problem gets easier by factor of 3:2 rather than 3:1.

[modeless]

I bet you might run into some interesting problems trying to represent white with two wavelengths. For example, colorblind people (7% of the population) might not perceive your white as white. And I wonder if there is more widespread variation in human eye responses to single wavelengths between primary colors that is not classified as colorblindness but could affect the perception of color balance in a 2-wavelength display.

[mark-r]

The whole point of this technology is that you don't need picking-and-placing anymore, it's all built on the same wafer.