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Electronic Paper:
If computer screens were as lightweight and flexible as a sheet of paper, your newspaper could update you every hour and still be portable. As this ScienCentral News video reports, some nanotechnologists say that soon everyone could be reading off electronic paper.
Electrifying Reading
One of nanotechnology's visions is a newspaper that updates itself constantly, and fits in your pocket. Electronic paper would offer all the pluses of old-fashioned newsprint: excellent resolution, high contrast that can be read in strong or dim light, no need for external power to maintain an image. It would be light and flexible enough to carry easily on your morning commute. But unlike newsprint, electronic paper would spare trees and wouldn't leave any messy newsprint on your fingers.
Such a dream will require computer screens as thin and supple as paper. Now E Ink, a company in Cambridge, Massachusetts, has announced a big step forward: an ultra-slim computer display that bends and rolls up into a narrow tube, about one inch in diameter.
The flexible display is a prototype of E Ink's ultimate goal, what the company calls "RadioPaper�." Chemist Michael McCreary, vice president for research and advanced development, believes that RadioPaper�, or digital paper as it's also called, is going "to revolutionize the publishing industry," because it's so easily updated.
A key component of RadioPaper� is electronic ink, invented by one of E Ink's cofounders, physicist Joseph Jacobson, and his research team at the Massachusetts Institute of Technology's Media Lab. This ink can be controlled electronically, stays as sharp as regular ink, and doesn't require extra power to retain text or images. Electronic ink consists of tiny capsules full of minute particles of black and white pigment that is sensitive to electrical charges. With a negative charge, white particles move to a capsule's surface; with a positive charge, black particles move up, to form words and pictures. With no charge, the pigment stays in place, so that text or graphics remain unchanged.
E Ink's first commercial product was electronic signs for use in stores and other public places. E Ink's signs used electronic ink to change their messages every few seconds via wireless connections, eliminating the need to constantly paste up new printed notices.
electronic paper from the side
The company's most recent research has been to "write" with electronic ink on a high-resolution flexible computer screen. E Ink's new research prototype is little larger than a business card, and no thicker than three sheets of paper. It can be rolled up into a cylinder without distorting words or pictures. The secret of its slimness and flexibility is very thin stainless steel foil. Traditional computer screens are backed by inflexible glass covered with silicon transistors. Plastic can be flexible, but may melt in the high temperatures required to fabricate transistors. McCreary's team discovered that unlike plastic, thin metal foil could withstand heat while remaining flexible.
"One of the advantages of RadioPaper� as we envision it," McCreary explains, "is that you could download many kinds of information onto it, wirelessly or through an Internet connection." He foresees pocket-sized electronic books that tell a different tale every week, smart cards that let you know your credit balance or your train fare, and even wearable computer clothing.
Early next year, E Ink displays will be used to make electronic books, a new way to read changing content on a display that looks very similar to paper. The researchers' next steps toward electronic newspapers including making the display thin enough to be folded, improving the ink's switching speed, and adding color.
McCreary et al's research was published in Nature, May 8, 2003, and is funded by E Ink.
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If computer screens were as lightweight and flexible as a sheet of paper, your newspaper could update you every hour and still be portable. As this ScienCentral News video reports, some nanotechnologists say that soon everyone could be reading off electronic paper.
Electrifying Reading
One of nanotechnology's visions is a newspaper that updates itself constantly, and fits in your pocket. Electronic paper would offer all the pluses of old-fashioned newsprint: excellent resolution, high contrast that can be read in strong or dim light, no need for external power to maintain an image. It would be light and flexible enough to carry easily on your morning commute. But unlike newsprint, electronic paper would spare trees and wouldn't leave any messy newsprint on your fingers.
Such a dream will require computer screens as thin and supple as paper. Now E Ink, a company in Cambridge, Massachusetts, has announced a big step forward: an ultra-slim computer display that bends and rolls up into a narrow tube, about one inch in diameter.
The flexible display is a prototype of E Ink's ultimate goal, what the company calls "RadioPaper�." Chemist Michael McCreary, vice president for research and advanced development, believes that RadioPaper�, or digital paper as it's also called, is going "to revolutionize the publishing industry," because it's so easily updated.
A key component of RadioPaper� is electronic ink, invented by one of E Ink's cofounders, physicist Joseph Jacobson, and his research team at the Massachusetts Institute of Technology's Media Lab. This ink can be controlled electronically, stays as sharp as regular ink, and doesn't require extra power to retain text or images. Electronic ink consists of tiny capsules full of minute particles of black and white pigment that is sensitive to electrical charges. With a negative charge, white particles move to a capsule's surface; with a positive charge, black particles move up, to form words and pictures. With no charge, the pigment stays in place, so that text or graphics remain unchanged.
E Ink's first commercial product was electronic signs for use in stores and other public places. E Ink's signs used electronic ink to change their messages every few seconds via wireless connections, eliminating the need to constantly paste up new printed notices.
electronic paper from the side
The company's most recent research has been to "write" with electronic ink on a high-resolution flexible computer screen. E Ink's new research prototype is little larger than a business card, and no thicker than three sheets of paper. It can be rolled up into a cylinder without distorting words or pictures. The secret of its slimness and flexibility is very thin stainless steel foil. Traditional computer screens are backed by inflexible glass covered with silicon transistors. Plastic can be flexible, but may melt in the high temperatures required to fabricate transistors. McCreary's team discovered that unlike plastic, thin metal foil could withstand heat while remaining flexible.
"One of the advantages of RadioPaper� as we envision it," McCreary explains, "is that you could download many kinds of information onto it, wirelessly or through an Internet connection." He foresees pocket-sized electronic books that tell a different tale every week, smart cards that let you know your credit balance or your train fare, and even wearable computer clothing.
Early next year, E Ink displays will be used to make electronic books, a new way to read changing content on a display that looks very similar to paper. The researchers' next steps toward electronic newspapers including making the display thin enough to be folded, improving the ink's switching speed, and adding color.
McCreary et al's research was published in Nature, May 8, 2003, and is funded by E Ink.
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