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R G B can only use parallel sub cells. Additive colour model.
C Y M can ONLY use layered sub cells. Subtractive colour model.
It's basic physics.
Additive mixing (sub pixels in parallel). Dots or cells are side by side.
G + B = C
R + G = Y
R + B = M
R + G + B = W
Vary proportions for other hues and saturations.
Subtractive Colour Mixing uses cells or pixels in layers.
C blocks Red
Y blocks Blue
M blocks Green
Thus Layers
White - C - Y = Green
White - C - M = Blue
White - Y - M = Red
White - Y - C - M = Black. Because print pigments are not perfect black is also used or you get a dark muddy colour.
Using C Y M print the pigments or transparent cells are superimposed.
R G B needs the dots side by side.
Projectors & cameras currently use either R, G & B added in a prism, OR red, green & blue filter or spinning R G B clear wheel on monochrome. Some displays might use also yellow for brightness. Some cameras and displays don't stripe R G B but use a Bayer pattern.
You could use a single cell with mix of multiple Cyan, Yellow and Magenta balls if there was a way of separating them. It was a lie-for-children in art class that you used red, yellow and blue primary paints. The red was closer to magenta and the blue closer to cyan or you couldn't get very many colours by mixing.
It's not impossible that they have cyan, yellow and magenta in one cell and mix like paint. I can't imagine how that's done compared to three thin layers of cyan, yellow & magenta balls in a clear liquid that can be move to sides of cell or face of cell.
No doubt eInk Corp will explain more later.
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