Had Dr. Dipak Chowdhury known just how accident-prone I really am, he
never would have handed over the 0.1-millimeter sheet of glass for me
to bend between my fingers.
Luckily for me, the vice president and director of Corning's Willow
Glass division is a trusting soul and gave the world's very first
public demo of this glass so thin it can bend without breaking.
Flexible glass and flexible screens have been a hot topic for some time, culminating with fanfare at Samsung's demo of its curvy Youm OLED display at
CES.
Companies like Samsung,
Nokia, and even
Apple
have been working on flexible smartphone displays for a years, but for
the first time, there's enough real research and development in this
area to, perhaps, start getting excited.
Eyes-on Samsung's Youm flexible display tech at CES (pictures)
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Just think of what a bendable smartphone could do: curve with your
body's movement so it sits more comfortably in a pocket; drop from a
height and flex on impact, rather than shatter; pack into any number of
compartments without having to triple-swath it in bubble wrap.
But don't get too frothed up yet. Willow Glass isn't the hearty
Gorilla Glass 3, Samsung's Youm screens have nothing to attach to yet, and smartphones that sway in the breeze are still years out.
There's more that needs to go with the flow than just the display and its glass.
The problems with flexible glass
One of the biggest challenges with a flexible phone is getting the
cover glass to bend -- and it's a common misconception that bendable
glass is unbreakable.
Corning's Dr. Chowdhury stresses that Willow Glass was designed as a
substrate material -- glass that belongs on the inside of a smartphone
-- but in its current form, it isn't strong enough to serve as the tough
barrier guarding the internal materials from the elements. It wasn't
designed to be.
Yes, a substance similar to the bowed Willow Glass could undergo a
similar chemical strengthening process as Corning's more famous
Gorilla Glass, the substance that makes up the outer layer protecting many of today's phones,
tablets, and laptops.
However, even if a Willow Glass cousin does grow fortified enough to
top a phone and maintain its bend, breakage is still a worry.
When chemists and industrial designers talk about strength, they're
not just talking about massive cracks and shattering. It is true that
flexible glass can withstand drop tests with less damage than some rigid
glass, thanks to its undulating ways, but it may not be able to rebuff
the scratches, gouging, and long-term wear patterns that make screens
vulnerable to breaks.
Though Corning's current Willow Glass formula can deeply arch, it can still also puncture and snap.
What about a plastic screen instead?
It's very possible that the first actively bending displays we see
will be covered by plastic rather than glass. As always, resilience and
durability are concerns.
"There will be a compromise there," said Mark Rolston, chief creative director of celebrated firm
Frog Design. "It's a material reality that anything that conforms will be more susceptible to scratches."
Corning's Dr. Chowdhury notes that some companies have demoed an
arching plastic display for several years, but that there's still a long
road to commercialization, even for the polymer.
The fact that the smartphone industry has almost wholesale moved from
plastic screens to glass is also telling -- you don't see a plastic
Retina Display on the
iPhone 5,
after all. Images look sharper and clearer with a glass cover, and it's
also more responsive and sensitive to touch. (I've reviewed
touch-screen phones without glass covers, and the experience was pretty
terrible.)
Glass is also better at being impermeable to oxygen
and water, two compounds you want as far from a phone's electronic guts
as possible, to keep them from damage and aging.
If we do see
bendable designs with plastic screens, they'll likely top reference
products and concept designs, or very early niche models, rather than
mature, mass-market devices.
Batteries don't flex well
Even
if you get the screen technology and the glass to flex, there's still
the matter of the other internal components. What do you do about the
battery, the processors, the camera module, and the NFC circuitry -- all
currently static wafers, bricks, and chips?
Today's conventional batteries work best as a brick.
Conventional lithium-ion batteries, which power today's
smartphones, are very rigid, says Marc Juzkow, vice president of
research and development for battery company
Leyden Energy. They need to be stiff and unyielding in order to last the longest time possible.
New battery technology in early development
is moving in the direction of the thin, flat cell, but these aren't the
right solution for a bendable phone, either, Juzkow says. First, they
use a solid state electrolyte to generate power-yielding reactions, and
that takes longer to charge. Second, their energy output isn't enough to
run a power-hungry phone for very long.
In case you're
wondering, it would in fact be possible to place a thicker, shorter
battery to one end of a device, Juzkow concedes, so that the phone
flexes while the battery does not. Makers of small flexible products,
like smartphones, could also insert a series of smaller batteries along
the length, leaving room for the device to bend between these static
slugs. There's just one major problem with the latter: smaller batteries
generate less charge and die off faster than larger batteries.
That
doesn't mean a flexible phone is out of the question. Mechanical and
design engineers have worked with shaped batteries and flexible printed
circuit boards before, even though both are generally rigid.
Flexible
printed circuit boards for example, were at one time ubiquitous in the
humble flip phone, connecting both halves of the clamshell as it folded.
As for shapely batteries, one only need to look to
Nike's FuelBand
for a hint of recently broken ground. In making the device, Nike placed
two curved batteries on either side of the band, covered by a piece of
metal goes that restricts that portion of the band from bending.
It may be that the flexible phone of the future comes with some premolded elements.
Seeking the Lycra of phone chassis
When
thinking about a bendable phone, there's also the problem of the phone
material itself. From a design perspective, you don't want the body to
be too lax or too rigid, says Rolston, Frog Design's creative lead.
"You
have to build in limits. You can use a flexible plastic, but can [the
body materials] also stop the movement at the end of the flex?"
In
other words, if the phone bends, will it snap back to its original
shape. There is such a thing, it turns out, as a phone that is
too flexible.
One good example of what's possible and what might actually come, is
Nokia's "kinetic device,"
a working prototype of a lightly twistable handheld computing device
that CNET reporter Stephen Shankland saw in London in 2011.
Beyond
its screen, you can manipulate the entire device, adjusting the sides
in order to scroll through content like music and photos.
Shankland reported that some of the devices Nokia demoed that day contain carbon nanotubes in an
elastomer
material, a specific type of rubbery polymer. Stressing one side of the
device while compressing the other created the physical interaction to
make images advance and music to forward.
The ideal material for a
flexible smartphone or other device bends slightly without losing its
original upright form over time, a sort of Lycra for the personal
electronics world.
"The question is the memory of the material,"
says Robert Curtis, Frog Design's executive director of product
development. "How much does it hold if it's bent or unbent?" Memory, in
this case, refers to the material's ability to return to its original
shape, the antithesis of memory foam.
The good news is, all the
materials to make this possible already exist. The difficulty is in
assembling all the pieces into a functional design.
Then there's the price
Ask
Corning's Dr. Dipak Chowdhury one of the main benefits of Willow Glass
and he'll tell you that because it can be made it in a roll, it's
cheaper to manufacture.
Yet the cost of making a single component
less expensively doesn't add up to a product that's cheaper overall.
The research, development, sourcing, and manufacturing process for new
materials doesn't happen overnight, and can wind up being pretty pricey
for a new technology.
How much would the average consumer pay for
a bendable phone? Sure, it's a neat idea, but after the novelty wears
off, how practical would a bendable phone really be compared to a
traditional stick-straight device? Put another way, how much extra would
you pay for your phone to conform to the shape of your pocket?
Forget the phone rollup, "bent" will triumph over "bending"
There's
one shape we can cross off the list when drafting the flexible
smartphone of our dreams: a device that rolls up into a circle or a
scroll.
A rolled-up handset is "a really stupid idea," says Mark Rolston, Frog Design's creative director.
"Rolling
and unrolling a phone defies the behavioral element of a phone," he
added, stating that people want to pull their device out of your pocket
and use it right away.
Flexible phones and other devices may have
a place in the world, but Rolston thinks they won't show up until the
bending of glass and other components is "really mature."
Corning's
Dr. Chowdhury agrees, partly because vendors haven't zeroed-in on what
they want. "We're trying to commercialize our glass," he said, and when
it comes to a fully-functioning device, "there's no agreed-upon term for
what "flexible" means." Without that firm definition, there's also a
foggy path to how vendors plan to profit from phone flex in their
designs.
Instead of bending for the sake of it, both the glass
and marketing executives see conformable displays finding much broader
applications at first, before we start seeing commercial uses for those
flexible bodies and screens. Premolded glass structures defy the
straight, flat rectangle comprising so many panels in TVs, cell phones,
and pretty much every programmable screen, and displays that take on
organic shapes and configurations have any number of uses: perhaps
futuristic computers that form the walls of your office, or a car
windshield you can program to show you a map while you drive.
Between
Rolston and Chowdhury, there are plenty of other examples that we can
expect in the near future across a variety of industries, some of which
we already see budding today:
- Wrap-around screens for devices and trade-show booths
- Curved displays for sports accessories, like watches and home appliances
- Formed displays for car dashboards
- Toys, thermostats, and tools that read out measurements
- Flexible photovoltaic cells for solar paneling you can unroll on a roof
These
ideas may not be widely seen today, but they aren't new. In 2008,
Rolston said, Frog Design created a prototype design for HP with a
wrap-around screen. It was decorative, rather than for informative, he
said, but it made the sides of this mystery device integral in the
never-released project's shape.
Rolston, for one, keeps coming
back to the car dashboard, waxing poetic in the charming way that
designers do about the aesthetically driven "humanistic" form of a
sculpted car dash and the effort that designers put in to create luxury
finishes using metal, wood, and carbon fiber.
"In the middle of
all that," Rolston laments, "we increasingly cut an 8-inch rectangular
hole to put a screen. If we can have that screen instead be part of the
material, part of the car's visual language...that would be a beautiful
thing."
"God, that'd be cool."
And perhaps that's the
major lesson that bendable screens can teach us at this stage in their
development. To be cool, you've got to be flexible.
