I think I need to do a AMA for parallel eink displays. Lots of misconceptions and misinformation (mostly EInk's fault - the company). It's actually easier to understand and control parallel eink panels compared to the SPI ones with the built-in controller. The reason I say that is because parallel eink only has one way to update the display - a 2-bit code per pixel: 00/11 = skip, 01 = darken, 10 = lighten. That's pretty much the whole story.
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