Electronic ink, or e ink, is a special type of electronic display. Somewhat similar to regular ink, e ink is unique in three primary ways: it is made up of many tiny capsules, these capsules are filled with ink, and the ink contains white particles that have a negative charge. These three properties allow an electronic ink display to be changed on demand.
E ink can be used on many of the same surfaces as regular ink. For example, e ink might be applied to a piece of thin plastic containing many small cells. The cells are connected to microelectronics in the sheet, and the ink covers the entire surface of the sheet. The microelectronics create a positive or negative charge in each of the capsules. A negative charge beneath a capsule causes the particles in the ink to go to the top of the capsule, covering its top surface and making it appear white. A positive charge attracts the particles to the bottom of the capsule, allowing the dark ink to show and making the capsule take on the color of the ink.

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