about the RGB colors displaying color, it has to do with a polarization filter.
So far when removing a polarization filter from a TFT screen you can only perceive white light.
Depending on how you will paste a linear polarization filter on the TFT/LCD screen the outcome will show R, G, and B pixels or some Pink, yellow and magenta type of colors.

The remarkable thing with the colors is that the polarization filter itself does not contain any color,neither the LED glass substrate.
I suppose since a polarization filter is letting certain light pass through it (horizontal/vertical waves) that by rotating certain light waves through a polarization filter light can change it's color like in a prism.
In this fashion RED, GREEN, or BLUE light can only pass the filter.

I suspect that the glass substrate with the liquid crystal is responsible for turning the light in the right direction, while the polarization filter is responsible to either pass or block the lightwaves depending on their angle; resulting in certain colors to become visible.
I've never read anything about LCD screens, but when I accidentally removed the polarization filter from my EeePc screen I came to a surprise, seeing only a white screen!

The colors must be displayed through a careful mathematical calculation on the light angle through the Liquid crystal display,and the polarization filter.