Bendable E-Paper Shows All Colors Of Rainbow!


Here’s a new type of e-paper (electronic paper) which is less than a micrometre thin, bendable and gives all the colours that a regular LED display does while needing ten times less energy than a Kindle tablet.

The researchers believe the best application for the displays will be well-lit places which are outside or in public places to display information. This could reduce the energy consumption and at the same time replace signs and information screens that aren’t currently electronic today with more flexible ones.

The material has been developed by researchers at Chalmers University of Technology, Sweden. The results were recently published in the high impact journal Advanced Materials.

When Andreas Dahlin, Assistant Professor at Chalmers University of Technology, and his PhD student Kunli Xiong were working on placing conductive polymers on nanostructures they discovered that the combination would be perfectly suited to creating electronic displays as thin as paper. A year later the results were ready for publication.


“The ’paper’ is similar to the Kindle tablet. It isn’t lit up like a standard display, but rather reflects the external light which illuminates it. Therefore it works very well where there is bright light, such as out in the sun, in contrast to standard LED displays that work best in darkness. At the same time it needs only a tenth of the energy that a Kindle tablet uses, which itself uses much less energy than a tablet LED display”, says Andreas Dahlin.

According to the news, the team has only tested and built a few pixels which use the same red, green and blue (RGB) colours that together can create all the colours in standard LED displays. The results so far have been positive, what remains now is to build pixels that cover an area as large as a display.

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“We are working at a fundamental level but even so, the step to manufacturing a product out of it shouldn’t be too far away. What we need now are engineers”, says Andreas Dahlin.

However, the use of gold and silver add to the display’s cost which is still one obstacle to its use.

“The gold surface is 20 nanometres thick so there is not that much gold in it. But at present there is a lot of gold wasted in manufacturing it. Either we reduce the waste or we find another way to reduce the production cost”, says Andreas Dahlin.

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