E-ink is a fascinating display technology. Here is an account of a non-destructive “teardown” of an E-ink display by optical coherence tomography (OCT): https

E-ink is a fascinating display technology. Here is an account of a non-destructive “teardown” of an E-ink display by optical coherence tomography (OCT): https://arxiv.org/ftp/arxiv/papers/1605/1605.05174.pdf https://arxiv.org/ftp/arxiv/papers/1605/1605.05174.pdf