Electrochromic, Gaschromic Technologies Featured at Trade Show (2)

Feb 8, 2013
Tetsuo Nozawa, Nikkei Electronics
The 3.5-inch full-color display using Ricoh's EC technologies
The 3.5-inch full-color display using Ricoh's EC technologies
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The 6-inch single-color display that has a resolution of 200ppi and can display 64 levels of the color
The 6-inch single-color display that has a resolution of 200ppi and can display 64 levels of the color
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Continued from Electrochromic, Gaschromic Technologies Featured at Trade Show (1)

There is a company that is trying to apply EC technologies to displays for electronic paper (e-paper) devices.

Ricoh Company Ltd exhibited a panel that it is developing for color e-paper devices based on EC technologies with a subsidy from Japan's National Institute of Advanced Industrial Science and Technology (AIST) at nano tech 2013.

The panel was made by staking three materials that emit cyan, magenta and yellow lights, respectively, in three layers on a PET (polyethylene terephthalate) film by using a coating process. And a voltage can be separately applied to each layer. But its electrodes and TFTs were made by a sputtering method.

In the demonstration of a prototyped 3.5-inch 113ppi panel, Ricoh showed Johannes Vermeer's paintings on it one by one.

Though Ricoh showed a similar panel at SID Display Week 2011, an international academic conference on display technologies, that took place in 2011, the latest panel has a higher color gamut and contrast ratio, it said. Specifically, the company improved color gamut from 27% to 35% and contrast ratio from 30:1 to 60:1.

Ricoh also exhibited a 6-inch XGA single-color color panel. It has a resolution of 200ppi and can display 64 levels of the color. It is driven by low-temperature polysilicon TFTs.

"We aim to commercialize a 10-inch panel by 2015," the company said.

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