Color Electrophoretic Display

Until now, the only way to get "full" color from an EPD -- at least the only way that E Ink has shown us -- is placing a matrix color filter in front of the monochrome display. E Ink showed the way forward a few years ago with a black, white, and red display, which managed to control particles of three different colors using differences in mobility and a cleverly designed controlling waveform.

At Display Week 2016, E Ink introduced an impressive expansion of this approach, in which particles of four different colors are included within each microcapsule, given different mobilities through different sizing, and driven with a pulsed controlling wave movement that permits the creation of thousands of colors, as explained by E Ink's Giovanni Mancini.  

 
The resulting display showed impressively bright and saturated colors and drew crowds.  When a new image was written, the display would flash several times.  It took about 10 seconds for a new image to build to its final colors.  One possible application Mancini mentioned is a color E Ink sign powered by photocells.


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