For our E-Ink display breakout boards, we add an SRAM chip onboard to help buffer the display. Unlike TFTs that have built-in video RAM, EPDs require writing the full memory at once—which can get into multi-KBs. For many modern chips, up to 64KB of video RAM isn't a big deal, but for small, low-cost micros like Arduino, that's a lot! Since EPDs are slow anyway, we can use an external SRAM chip for fast write/read—an ideal solution. See the chosen part on DigiKey https://www.digikey.com/short/5ndhzrm5 ----------------------------------------- Visit the Adafruit shop online - http://www.adafruit.com LIVE CHAT IS HERE! http://adafru.it/discord Subscribe to Adafruit on YouTube: http://adafru.it/subscribe New tutorials on the Adafruit Learning System: http://learn.adafruit.com/ ----------------------------------------- #EInk #Sensors #Engineering