E-ink ESL in retail: technology, applications, and advantages

E-ink (electrophoretic e-paper) is based on electrophoretic processes within microscopic capsules. Each pixel contains microcapsules filled with electrically charged pigment particles (typically black and white) suspended in a fluid. When an electric field is applied, the particles move either to the surface or into the background. This creates a visible pixel (light or dark, with extensions for color systems). The image is bistable, meaning it remains stable without a continuous power supply.

• Reflective display (no backlight), paper-like appearance
• Very high readability, especially under direct lighting or sunlight
• Wide viewing angle (close to 180°)
• Low reflectivity compared to emissive displays
• Typical contrast ratios in the range of 10–15:1 (for monochrome variants), ensuring good readability

• Power consumption only occurs during image updates
• Bistable: stable display without continuous power
• Update times: several hundred milliseconds (monochrome) up to 2 seconds (color)
• Specialized control using optimized waveforms (a coordinated sequence of voltage pulses) to reduce ghosting (residual images from previous content)
• Temperature-dependent performance (relevant for refrigerated or outdoor environments)

E-ink is not a one-size-fits-all technology. Different technological approaches offer varying display capabilities and use cases at the shelf.

E-ink displays have become one of the key technologies for electronic shelf labels in retail, especially wherever energy efficiency, readability, and minimal maintenance are essential. Thanks to their bistable nature, they only consume power when updating content, enabling battery lifetimes of several years – a major advantage for large-scale ESL rollouts.

In day-to-day use, E-ink ESLs excel in standard price labeling, product information, and static content. Their paper-like appearance leads to high customer acceptance, as prices and text remain easy to read even under challenging lighting conditions or direct sunlight. At the same time, variants with extended color capabilities allow for targeted visual highlights in promotions or special offers without significantly increasing energy consumption.

This makes E-ink-based ESLs particularly well suited for applications where content does not change continuously but must be displayed reliably, clearly, and consistently – from supermarket shelves and drugstores to electronics retailers and home improvement stores.

E-paper displays are ideal for simple, fundamental content without animation, such as price tags, product information, QR codes, or static promotional content. Rapidly changing content, animations, videos, or colorful product images are not well suited to E-ink.

Yes, with some limitations:

• Standard: black and white
• With color filter: basic colors, but reduced brightness
• Multi-pigment: better color rendering, but slower updates

The greatest benefits come from:

• Reduced labor costs
• Improved price accuracy
• The ability to implement dynamic pricing

How quickly the investment pays off depends largely on the size of the stores or store network and how manual and labor-intensive existing processes are.

In general, yes. However, performance – especially update speed – is temperature-dependent and may slow down in colder conditions.