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Did you read what I said about the basic mathematics and physics of adding colour to eink? It's physically impossible to do it with any sort of quality except with a front light about x5 brighter, minimum, than decent ambient light.
The theoretical minimum loss for a perfect filter with good colour saturation is about x3!, i.e. each pixel gets 1/3rd of the daylight = x3 loss or more. BUT, the filters are lossy even to desired colour, and the light is reflected, so reduced twice. Really good R G B filters would reduce the light even more.
Then you need three inline pixels for each new pixel (R G B), or a square of 2 x 2:
B G
G R
layout works.
So for 300 dpi colour you need either 600 dpi mono, or 900 x 300 mono.
This is the reality for LCD, which compensates with a backlight, so eink loses TWICE the light as LCD as it's reflective rather than transmissive. Of course the polarisers and metallisation for addressing and TFTs also reduce LCD brightness a bit.
You'd thus need a very bright even front light (negating the ambient light advantage) and higher resolution than any current eink.
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