There are many display technologies that can be called e Paper. Among them, the most traction is called Electronic ink technology, or simply E Ink technology, developed by E Ink Corporation based on research achievements at the MIT Media Lab .
E Ink imaging film is composed of several million of microcapsules. There are charged white and black small particles suspended in a solvent that is encased in the microcapsule. With the application of a voltage across the microcapsule, either the white or the black pigment particles can be driven to rise to the top of the microcapsule. Therefore, an observer looking at the microcapsule from above will see a white or black dot. Combinations of white and black dots within several million of microcapsules make for text and picture rendering.
E Ink is currently available commercially in grayscale and is generally used in mobile devices such as digital readers. Commercial E Ink displays include the high-resolution active matrix displays used in the Amazon Kindle reader, Sony Librie, Barnes & Noble Nook , Sony digital reader and iRex iLiad e-readers. These displays are constructed from an electrophoretic imaging film produced by E Ink Corporation .
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