Electronic paper was developed in order to overcome some of the limitations of computer monitors. For example, the backlighting of monitors is hard on the human eye, whereas electronic paper reflects light just like normal paper. It is easier to read at an angle than flat screen monitors. It is lightweight, durable, and highly flexible compared to other display technologies, though it is not as flexible as paper.
The network of electrodes is connected to display circuitry, which turns the electronic ink 'on' and 'off' at specific pixels by applying a voltage to specific pairs of electrodes. Applying a negative charge to the surface electrode repels the particles to the bottom of local capsules, forcing the black dye to the surface and giving the pixel a black appearance. Reversing the voltage has the opposite effect - the particles are forced from the surface, giving the pixel a white appearance. A more recent incarnation[4] of this concept requires only one layer of electrodes beneath the microcapsules.
Polychrome e-paper
Simple colour e-paper[8] consists of a thin coloured optical filter added to the monochrome technology described above. The array of pixels is divided into triads, typically consisting of the standard red, green and blue, in the same way as CRT monitors, although, for commercial releases of e-paper in the forms of newspapers etc, it will most likely be in the 'CMYK' format, for clarity of writing. The display is then controlled like any other electronic colour display.
For more information visit: http://en.wikipedia.org/wiki/Electronic_paper
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