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So, if I understand correctly, the broader incident angles are not completely redirected (AI=AR @ refraction / reflection) by the microlens, allowing scattering of energy to occur to nearby subpixels. Such that for that energy that isn't fully captured by green subpixels, there will be residual/reflected/scattered energy being captured by neighboring red & blue (thus purple) subpixels, or conversely if the red/blue subpixels aren't fully capturing, the nearby green (thus green) subpixels will capture some scattered energy.
So, the wider the angle of incidence, the greater the difference between refracted vs. reflected ... and the wider the aperture, the more varied the AI Similarly with tilt functions, the varied AI's aren't fully refracted, allowing for more reflection to neighboring subpixels. Thus, the more stopped down the aperture, some reduction in the angles of incidence occurs ... mitigating some of the scattering.
I think I got it ... thanks.