A closer look at e-paper, often called e-ink. And with closer I mean super-macro of course...
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The color grid technology by E Ink is named "Kaleido". The technology in the picture frame is ACeP or "Gallery 3" also by E Ink. They recently released a version with 6 pigments but this is not available yet (sept 2023).
Good article about the history of e-paper: https://medium.com/@supernote/the-history-of-electronic-paper-cdafa0d6cc38