eInk, short for electronic ink, is a display technology that holds an image or text on the screen without constant power. It only uses energy when the display changes, which makes it ideal for long-running, low-power devices such as labels, readers, badges, and small embedded projects.
In cybersecurity, eInk matters because it can keep important status visible even during outages, reboots, or limited battery life. That makes it useful for access badges, security notices, inventory tags, and device dashboards where the display should remain readable and trustworthy. It also creates a security boundary: if a device receives content over a network, attackers may try to alter what is shown by compromising firmware, update channels, or content sources. Defenders therefore care about signed firmware, authenticated updates, and tamper-resistant display logic.