Polychromatic Pixels

Does this need very accurate DAC to cover the entire color spectrum? Maybe even fine-tuning on each pixel?

Alien Vs Predator 3?

My ultimate hope is that this will allow us to store and display color data as Fourier series.

Right now we only represent colour as combinations of red, green, and blue, when a colour signal itself is really a combination of multiple "spectral" (pure) colour waves, which can be anything in the rainbow.

Individually controllable microLEDs would change this entirely. We could visualize any color at will by combining them.

It's depressing that nowadays we have this technology yet video compression means I haven't seen a smooth gradient in a movie or TV show in years.

Hm, thinking about this further, this would need dithering to work properly (which probably works fine, but the perceived quality difference would mean pixel density comparisons aren't apples-to-apples)

Presumably, you get to control hue and brightness per-pixel. But that only gives you access to a thin slice of the sRGB gamut (i.e. the parts of HSL where saturation is maxed out), but dithering can solve that. Coming up with ideal dithering algorithms could be non-trivial (e.g. maybe you'd want temporal stability).

With two wavelength-tunable LEDs you should be able to cover the entire CIE colorspace.

That's because the points on outer edge of CIE are pure wavelengths and you can get to any point inside by interpolating between two of them.