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Speed issue:
The bistable displays like E ink Corp are mechanical. Admittedly the DLP system is also mechanical, but the mirrors in it are a tiny fraction of the size and not in a liquid.
The epaper/eink/ACeP panels use particles in a liquid, so they are inherently slow. The higher speeds quoted are usually without intermediate levels, simply black or white with mono ink (or colour via CFA of Triton or Kaleido). The ACeP/Gallery 3 panel cells are inherently even slower due to the C Y M W layers.
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