E Ink (electronic ink) is a paper-like display technology, characterized by high visibility and contrast, a wide viewing angle and low power requirements.

E-link is currently available commercially in grayscale and color and is commonly used in mobile devices such as e-readers, and, to a lesser extent, digital signage, mobile phones, smart watches, electronic shelf labels and architecture panels. E Ink is processed into a film for integration into electronic displays and has enabled novel applications in phones, watches, magazines, wearables and e-readers.

Advantages of E Ink include low power usage, flexibility, durability and ruggedness and better readability under direct sunlight. Low-power, high-resolution screens will allow it to reduce energy consumption and the related costs, as they are powered by a solar panel and require power only when content is changing or being updated. The lower weight of the screens than those typically used is also said to make them cheaper to install.

The applications in Public Transport is still at prototype level ut they are increasing in the last 2-3 years.