I decided to try my math again and document it more carefully. -------- https://www.pervasivedisplays.com/wp-content/uploads/2021/12/1P255-00_03_E2154CS0C1_20

I decided to try my math again and document it more carefully. -------- https://www.pervasivedisplays.com/wp-content/uploads/2021/12/1P255-00_03_E2154CS0C1_202111203doc.pdf https://www.pervasivedisplays.com/wp-content/uploads/2021/12... Pervasive Displays has an oscilloscope measurement of 3.75mA on their 5.9-second updates for their 1.54" eink screen. (Page 14). That's 22.125 mCoulombs of electrons. -------- https://media.digikey.com/pdf/Data%20Sheets/Sharp%20PDFs/LS013B7DH03_Spec.pdf https://media.digikey.com/pdf/Data%20Sheets/Sharp%20PDFs/LS0... Sharp 1.2" memory-LCD (a bit smaller) has 12uW to 50uW on static images. Assuming 3.3V, that's 15uA worst case (0.015mA). ------- 22.125 mCoulombs / 0.015mA == 1475 seconds per update break-even point, or ~24 minutes. So yet another number, but yeah, memory-LCD is just really good. Remember that the 1.2" screen from Sharp is a bit smaller though, so its not a perfect apples-to-apples comparison. Either way, its a much longer period between updates than I was expecting.