An e-ink display is a type of screen, also called electronic paper, that mimics the look of ink on paper. It only draws power when the image changes and holds its content without electricity, which makes it well suited to devices that show the same information for long periods.
E-ink screens contain tiny charged particles, usually black and white and sometimes with a coloured pigment, suspended in microcapsules or a fluid layer. An electrical signal moves the particles to the surface to form text or graphics. Because the screen is reflective rather than backlit, it is read using ambient light, which gives high contrast and a wide viewing angle, even in bright stores.
Retailers meet e-ink most often in electronic shelf labels, where it lets a small battery run the label for a long time. Updates take a moment and can show a brief flicker as the screen refreshes, so e-ink is not suited to video or fast animation. Some displays are limited to black, white and one or two accent colours, which is usually enough for prices and promotional flags.
Considerations include refresh speed, colour range, size options and operating temperature. Chilled and freezer areas may need labels specified for lower temperatures, and cold conditions can affect update speed and battery life. Compare screen readability in your actual lighting and from typical shopper viewing distances before committing to a label size.
E-ink matters because it makes digital shelf pricing practical. Low energy use keeps maintenance down, while crisp, glare-free text keeps prices easy to read, supporting consistent pricing without constant label changes.