Ricoh has developed an extra-vivid color e-paper using copier technology, which is 50% brighter than conventional devices, reported DigInfo News.
The prototype color e-paper offers a 3.5-inch, QVGA display that is 2.5 times brighter than current color-filter displays, and can produce colors better than current newspapers with a pixel density of 113.6 ppi and reflectivity of 70%.
The material used by Ricoh for the chromic layers is transparent in its oxidized state, but becomes colored when it’s reduced. To achieve a color display, rewriting is done three times in the order magenta, yellow and cyan. As the spaces between the electrochromic layers are as narrow as to about 2 microns, the result is an ideal color-mixing display.
Ricoh says it applied color copy machine technology to e-paper, using cyan, magenta and yellow as the base colors instead of red, green and blue used in existing e-papers.
The company claims that squeezing a transparent electrode and the three color layer, separated by insulating layers, between two sheets of glass made it possible to produce a color e-paper prototype that’s not only thinner but also lighter than conventional models. It can also retain graphics after the user turns it off.
The company announced that they would like to increase the current size to 6 inches and then to 10 inches and are working towards achieving stable driving and faster response.
“The stage we’re at right now is, we’re checking that this model works with an actual active panel. Regarding the color drive, we haven’t refined this yet, so switching takes over a second for each color. But the reaction speed of the chromic material is, ideally, about 100 ms.” said the company in a statement.
The e-paper is currently under development by Ricoh, which is planning to get itself a practical version ready by 2014.