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And ALL colour screens need x3 to x5 as many pixels (coloured) to do monochrome or colour.
LCDs typically have to have x3 or x4 as many actual LCD pixels.
The colour on LCD and eink is ALWAYS a translucent dyed layer carefully aligned to the monochrome higher resolution layer underneath. A stripe filter only needs horizontal alignment (better than 1/10th pixel). Pentile or similar displays need perfect alignment in horizontal and vertical axis. Though the original Pentile cell used 5 pixels, some use a 2 x 2 arrangement (so 300 dpi needs a 600 dpi mono display underneath). Conventional systems use R G B horizontally, so 300 dpi would need a 900 x 300 dpi mono display under the filter.
The colour layer on LCD and eInk isn't active. Some AMOLED/OLED also need colour filters.
The only displays that NEVER have a colour filter are CRTs, large real LED panels, Plasma, VFD (which are only ever small and low resolution). lasers and DLP.
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