|
Any eink made colour is MUCH darker than the underlying monochrome screen. That's why putting a filter on top of eink to do colour (like filter on top of LCD panels) is a dead end niche technology. If it's saturated colours then it's about 1/6th bright. If pale pastel shades then about 1/2 as bright.
LCDs are transmissive and back lit. You can make the back light as bright as needed. eInk is reflective and opaque. Thus less than 1/2 the brightness for same light. Colourised eink using regular eink under the filter are unusable without a lot of light.
The other issue is that an eink cell is blackish, whiteish and much slower are 14 additional shades of grey. The LCD & OLED easily do 254 levels of grey, black and clear.
You also have lower resolution depending how the colour filter is done. so for a 300 dpi panel either 100 x 300 dpi or 150 x 150 dpi
|