What's a graphene display and why it's going to be in flexible smart devices from the future


Yesterday, a Chinese manufacturer whose name escapes us turned a few heads by showing a working and completely flexible Android smartphone which uses a graphene screen. The invention is shaped like a bracelet and has no problems wrapping itself around a lady's hand, for example. This glimpse of the feature reminded us that leading smartphone makers already have flexible displays in mass production, but they still choose to incorporate them in devices that are absolutely flat and un-bendable. It also sparked our interest in the never seen in use before piece of technology that is the graphene display.

What's graphene?

Graphene is a layer of pure carbon. At just one atom thick, graphene is the thinnest, lightest, strongest, most transparent, and most heat and electricity-conductive material known to scientists. The ultimate super-material which, mixed with traditional metals and plastic, could shape the future of, quite literally, everything! As carbon is the chemical basis for all known life on Earth and found in abundance, graphene is envisioned by futurologists as an ecological, sustainable solution for a theoretically limitless number of applications.

Graphene research has been particularly fruitful in the fields of electronics and biotechnology, although there's still work left to do before the element can be produced in a safe and cost-efficient manner. With development in this direction steadily progressing since 2012, when an important scientific discovery proposed a less toxic method for obtaining high-quality graphene, it's no surprise that display manufacturers, along with other technological enterprises, are heavily interested in the material.

Yesterday marks the first time we've seen graphene used in a flexible smartphone display, in a manner that makes not just the screen, but the entire device fully bendable. Clearly, the future of flexible smart devices that can be worn or experimented with by clever designers will involve the application of graphene, in addition to the already familiar plastic OLED technology used by Samsung, LG, and Apple for their smartphones and smartwatches. So here's an informative look at what a graphene display is right now, along with its questionable near future.

What's a graphene display?

The first flexible graphene display (pictured) was prototyped in September 2014 by two partnering institutions – the University of Cambridge Graphene Center and UK firm Plastic Logic. It was a monochrome screen, similar to that of e-readers. The invention might seem limited, but it's an essential step towards the wearable and flexible smart devices the future has in store.

This particular display, and possibly others that followed it – like the one on the Chinese smartphone we saw yesterday – works on the principle of active matrix electrophoretic. It uses an electric field to output images via re-arranging particles suspended in a solution. The layer of emulsion-processed graphene electrode is deposited onto a flexible plastic panel and etched with electric circuits. There's no intrinsic requirement for using glass sheets, which means graphene displays won't be subjected to the kind of impact damage sustained by glass-covered screens.

Moreover, this sort of display should be easier to produce than flexible OLED screens, because its backplane – the electrical layer which supplies power for re-arranging display particles – can be produced using a low-temperature process (at below 100° C / 212° F), which minimizes yield risk and makes the production less resource-intensive.However, smartphone graphene displays will likely use elements from LCD and OLED technology to provide the kind of colors and refresh rates needed for an adequate user experience. This will inevitably complicate production somewhat.

About five months later, researchers from the University of Manchester and University of Sheffield introduced a semi-transparent, graphene-based LED screen, which is the basis for the flexible graphene displays that will end up in future mobile devices. Being only 10 to 40 atoms thick, it emits light across its entire surface without the need for a backlight.

When are graphene screens coming to smartphones?

We don't know! For the time being, graphene is too expensive to be used in large-scale production of touch-screen displays. And besides, there's much work to be done before a graphene screen can compete with a fine LCD or OLED screen in terms of image quality. Hence, its introduction to smartphone displays is more likely to start on the level of touch screen controllers.

In late 2014, researchers from the University of Surrey and Trinity College, Dublin developed a "simple, scalable, and inexpensive method for creating hybrid electrodes by combining graphene (with its transparent and conductive properties) and silver nanowires. Their accomplishent is in reducing the amount of nanowires needed to produce a touch screen layer more than 50 times, thus simplifying the production process. This concoction could replace the indium tin oxide layer technology that's currently in use, although we're yet to see it appear in consumer devices.

References:

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15 Comments

1. siddharthayadav202

Posts: 286; Member since: Apr 23, 2016

I think carbyne is much more stronger than graphene. It was unstable till a few weeks ago when they found a way to stablize it using Carbom Nano Tubes.

10. marorun

Posts: 5029; Member since: Mar 30, 2015

But dont have same property and cannot be used for screen. But just as a super solid material you are right.

13. Nopers unregistered

Yes but you can't build a large sheet of it. The carbon nanotubes were just there to support the length of carbyne. Basically they did it to prove that they could.

2. SumDumFuq

Posts: 10; Member since: Mar 31, 2016

Read somewhere in the past Samsung already know how to make a big batch of this Graphene. So where is it Sammy boy?

6. ibend

Posts: 6747; Member since: Sep 30, 2014

read where? I know they already working for graphene display and batteries, but never hear about that "big batch".. but no worries.. if they say that, they'll deliver..

9. zunaidahmed

Posts: 1183; Member since: Dec 24, 2011

Is your profile picture squid girl?

8. krystian

Posts: 423; Member since: Mar 16, 2016

It's not always about what you can do with a prototype but if you can actually change your manufacturing process to allow for mass production. That's the costly and tough endeavour.

12. Trakker

Posts: 283; Member since: Feb 11, 2016

They've found an easy way to produce it using the laser of a Dvd/Blu-Ray writer but haven't heard of a way of large-scale mass production yet.

3. ibend

Posts: 6747; Member since: Sep 30, 2014

"in addition to the already familiar plastic OLED technology used by Samsung, LG, and Apple for their smartphones and smartwatches".. why not pick motorola or others instead of apple, since apple never use "OLED technology" for their smartphone?

4. kiko007

Posts: 7493; Member since: Feb 17, 2016

They do use it for the Apple Watch. Perhaps that is why the author included them. Plus ya know, if an article doesn't have Apple in it, they feel incomplete. (Spoken by a true Apple fanboy no less)

5. kiko007

Posts: 7493; Member since: Feb 17, 2016

Incomplete to the author not us readers BTW.

7. siddharthayadav202

Posts: 286; Member since: Apr 23, 2016

Waiting for day they add i in from of their name @PA

11. Landon

Posts: 1245; Member since: May 07, 2015

"Being only 10 to 40 atoms thick, it emits light across its entire surface without the need for a backlight." holy crap this is flipping awesome. I love me some innovation!

14. roscuthiii

Posts: 2383; Member since: Jul 18, 2010

Nice read Luis D. I almost thought this was a Michael H. piece.

16. MrElectrifyer

Posts: 3960; Member since: Oct 21, 2014

Is it pronounced as "graf-fin" or "gra-phe-ne"? I a'ways thought it was an english word and was pronounced as the former, but oddly, my Surface Pro pronounced it as the latter. Easily fixed via the pronunciation dictionary, just curious.

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