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Optoelectronics/Displays??

Electronic paper offers 4x wider color reproduction

Posted: 30 May 2011 ?? ?Print Version ?Bookmark and Share

Keywords:electronic paper? display method? color devices?

Ricoh Company Ltd has announced that their electronic paper, using the company's original display method, achieved a display of color still images with about 2.5x brighter (in white reflectivity) and about 4x wider color reproduction range compared with presently commercialized or announced color electronic paper technologies.

According to a report from Gartner Inc., Ricoh's electronic paper, having no luminous source, differs from a conventional display unit. It requires no electric power, except for rewriting characters and images. Known as a technology gentle on the environment and the human eye, 6.6 million monochrome devices for reading digital books are now sold annually throughout the world using the technology and sales are predicted to exceed 11 million readers in 2011.

Color image display

An example of color image display using lamination electrochromic method.

Although color devices are in demand, the methods proposed for color electronic paper have thus far not been able to solve the lack of brightness or color reproducibility, even in theory. Thus, the color electronic paper market is expected to grow together with future technology development, expanding into all possible applications.

"Ricoh developed the world's first new organic electrochromic material (*2) producing three primary colors (Cyan, Magenta and Yellow) while improving memory properties in March 2009. The company, at the same time, proposed a simple laminating element structure, forming three electrochromic layers between two substrates. This was made possible by stepping outside the box and beyond the original display methodology hitherto in vogue. This proved the feasibility of color electronic paper capable of achieving a bright display at low power consumption and low cost," said Shimpei Yamada, president of Yamada Chemical Co., Ltd.

Based on this result, Ricoh moved from the development phase of element technology to the development of a practical application of prototypes featuring high resolution electronic paper. They achieved bright images with high color image reproducibility. Ricoh is set to accelerate the development toward practical applications by improving reliability/repetition durability (guaranteeing tens of thousands of rewrites) and larger screen size.





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