In the 1970s, Xerox Palo Alto Research Center (Xerox PARC) was a powerhouse of innovation. Many aspects the modern computer, namely the mouse, laser p

The Future of Electronic Paper

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2021-06-07 01:00:05

In the 1970s, Xerox Palo Alto Research Center (Xerox PARC) was a powerhouse of innovation. Many aspects the modern computer, namely the mouse, laser printer, Ethernet, GUI, computer-generated color graphics, as well as a number of important computer languages, were invented at PARC around that time. Yet another development, nearly lost among those important breakthroughs, was invented in 1974 by PARC employee Nicholas K. Sheridon. The Gyricon, a Greek term for rotating image, was to be new display technology for the Alto personal computer; eventually, it became the basis for modern e-paper technology.

A: In the late 60s and early 70s, Xerox PARC was developing and attempting to get Xerox management to appreciate the Alto personal computer; they never did. It was the world’s first office and word-processing computer, but this remarkable machine had one serious drawback: the cathode-ray tube display it used—the best available—was not bright enough, and the contrast was not great. People that used the machine did so in a darkened room, with the lights turned off and the window shades drawn. Several of us scientists were asked to try to find a better display, hopefully one that could permit operation in a brightly lit ambient. I invented the Gyricon rotating-ball display and a display based on a physical phenomenon I called “electrocapillarity.” The electrocapillarity display worked by moving colored liquids against a white background. The rest of the group worked on electrophoretic displays (eventually dropped due to lifetime problems).

I codeveloped the Gyricon and electrocapillarity displays for about 18 months and finally decided the Gyricon would be easier to develop. Hoping to get back to the electrocapillary display, I delayed applying for patents until the early 90s. When my patent applications were laid open in Europe, a university group revived the work and changed the name to “electrowetting.” Electrowetting is widely studied and is considered a promising candidate for electronic paper. I published a paper on the Gyricon and made several presentations. Several patents were applied for. About this time, I met the Xerox head of corporate research in the PARC cafeteria. He complimented me on my display work but pointed out that Xerox was not in the display business. At this point, I realized the Alto was not going to be developed by Xerox. He strongly urged me to invent new printer technology to counter the erosion of the Xerox copier/printer market by the Japanese.

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