An e-reader can continue to show a page while its screen no longer receives energy. This behavior is surprising when we think of screens that must continually maintain their display. In electrophoretic electronic ink, the image is based on physical particles: their position determines the appearance of the surface.
In a monochrome version described by E Ink, tiny capsules or cells contain black and white pigments in suspension. Their electric charges allow them to be moved by an applied field. Depending on the particles brought to the top, an area appears light or dark. The text thus results from a hardware arrangement controlled electronically, and not from a permanent light emission.
Once the particles are placed, the image can be kept without power provided on the screen: this is the bistability. Changing the page requires energy, and the other components of the e-reader can still consume it. The entire system did not become autonomous. But its display borrows from paper a valuable property: to remain legible without having to be constantly recreated.
What we know
The preservation of the image does not make the entire e-reader without consumption.
To go to the source
References consulted on September 21, 2026. Linked pages may be in another language.
Signaler une erreur ou apporter une précision
