https://blog.wongcw.com/2021/04/08/e-ink-spectra-3100%e9%9b%bb%e5%ad%90%e7%b4%99%e7%99%bc%e5%b8%83%ef%bc%8c%e5%8f%af%e9%a1%af%e7%a4%ba%e9%bb%91-%e7%99%bd-%e7%b4%85-%e9%bb%83%e5%9b%9b%e8%89%b2/