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Top-selling smartphone models from Apple, Samsung and Chinese tech companies are reaching the limits of impressing consumers based on new design elements.The last significant and sustained change in the smartphone design era will be a truly foldable handset.The 334.3 million units shipped during the first quarter of 2018 was a 2.9 percent decline year over year, according to IDC, and was led by China, which declined to a level not seen since 2013.With few exceptions, top-selling smartphone models from Apple, Samsung, Huawei and the rest — a sea of rectangular slabs with rounded corners and maybe a bezel — lately have reached the limits when it comes to impress consumers with new design elements to stand out.
Now they are all about the screen.

According to Brett Newman, co-founder of product design firm Daylight Design, the screen is “the point of interface, the centerpiece of the design.” Most buyers just want a screen that’s durable enough not to crack when dropped, coupled with two diametrically opposed design elements: a bigger, richer screen on which to consume media, but which also lays atop a smaller handset that fits within a palm or pocket. The latter problem is getting closer to being solved.
All the major smartphone makers are quietly working on foldable phones, devices that might use two or more bendable OLED panels that form a large screen when unfolded, according to recent reports. Huawei might have something to show us in October, Samsung’s foldable Galaxy X is Reportedly due for launch sometime in 2018 or 2019, and Apple’s version could come as soon as 2020.
Apple  and Samsung  declined to comment.

If these devices work well, look sleek and offer a user experience that’s as rich or richer than what our iPhone X and Galaxy 8′s provide, a flood of phones with 6-inch or 7-inch screens that scrunch down into 3.5- or 4-inch forms might have the potential to shake up the saturated smartphone sector.
“Foldable phones could be the future,” Newman said. “But they need to meet the current standards of performance and specifications and be foldable to be widely accepted. If they do both, there is a chance for a significant, sustained meaningful change in the market,” he added. There’s no doubt that consumers and Wall Street would welcome the debut of a relevant, cutting-edge form factor in the global smartphone market, where shipments have waned due to fewer smartphone converts and fewer people willing to upgrade as often. According to IDC, vendors shipped 334.3 million units during the first quarter of 2018, a 2.9 percent decline over the prior year’s first quarter. China drove the decline, where shipment volumes dipped below 100 million — a low not seen since late 2013.

“The abundance of ultra-high-end flagships with big price tags released over the past 12 to 18 months has most likely halted the upgrade cycle in the near term,” IDC said in its most recent Worldwide Quarterly Mobile Phone Tracker. “It now looks as if consumers are not willing to shell out this kind of money for a new device that brings minimal upgrades over their current device.”

The foldable phone is almost a realityA foldable phone powered by technology that delights users might tip the scales up — at least a bit.

“You only have to look at the other core electronic devices with screens — computers, TVs, tablets — to know that once you get saturation, there is never going to be this huge explosion of demand for these products,” said Stephen Baker, vp and industry advisor for technology and mobile at market research firm NPD Group. ”[Foldable phones] will be great, awesome products, but I’m sure it will be a slow burn in terms of both the interest level and people’s acceptance. But this is the kind of stuff you do as a consumer electronics company — you advance the product.”
There have been a handful of dual-screened, hinged phones released over the past decade, but all have sacrificed too many features to be up to snuff to their one-interface pairs. ZTE’s Axon M, introduced in October, got the market a little closer with its two 5.2-inch LCD screens that form a 6.75-inch tablet when opened.

The ZTE Axon M is not a true flexible phone — the second screen slides out from the back and is attached with a bulky hinge. And with a price tag of $725, a few shortcomings won’t help convince consumers: its displays are lower resolution than most 2017 phones, while the life of its battery, which must power two screens, is expected to be significantly shorter. ZTE also is currently in a fight for its life as the US-China trade war evolves, with a proposed US ban on its use of American technology components posing an existential threat.

The biggest design challenge with foldable smartphones is with screens, which like on all high-end models, are made up of various layers of glass and/or polymer films.
“Developing any glass to bend at a tight radius hundreds of thousands of times without significant damage, and whilemaintaining outstanding optical properties, is a challenge,” 
Foldable phones are likely to be based on OLED screens, which presents another problem, according to David McQueen, a research director at ABI Research. The OLED layer is semipermeable, which makes it susceptible to moisture leaks. Major display manufacturers — LG Display, Samsung and Royole, to name a few — are examining ways to coat interfaces with protective barriers.
Folding a display 280 times a dayFolding a display 200,000 times without damage — opening and closing the phone about 280 times a day to meet a two-year device warranty — is an early expectation. Hsieh says that mechanical designs haven’t quite gotten there, although German glassmaker giant Schott says Its materials are ready.
“Whatever foldable device that comes to market next year, if it has a glass cover, most likely it will be from Schott,” said Jose Zimmer, a vice president Schott Thin Glass & Wafer.
The firm developed a production technique that draws down the thickness of its glass significantly to less than 100 micrometers (versus the 300 to 400 that today’s smartphone cover glass features). Laminates chemically strengthenly its display material. Schott’s flexible glass has undergone undergoing bend tests of up to 100,000 times.
Corning, the display glass market leader, is still working to find the optimal tradeoff between beauty and function for foldable glass. “We can make foldable displays, but they tend not to be that compelling versus what you can have today,” said CEO Wendell Weeks on the company’s latest quarterly conference call in April. “And if we try to make a very compelling form factor, they tend not to be durable enough. We’re a long way from having a really compelling product here.”

Samsung already offers screens that are flexible and curved, on phones and other smart devices like its Gear Fit watch. But a truly foldable Galaxy phone isn’t out yet, though company officials previously indicated that 2018 could be the year if technical problems are solved .″[A manufacturer] might have the right answer, but is it

compatible with all the other things that go on in a device and can you scale it?” said William Stofega, program director for IDC’s mobile device technology and trends research program. “What we really need is something that’s not a lab experiment; something that can be produced in volume. It’s a process.”
Royole, a six-year old manufacturer, says flexible displays are production-ready; they’re just waiting for the rest of the supply chain to catch up.

“Before flexible/bendable displays became available for commercialization, it was difficult for manufacturers to work on consumer product design to even begin to find out what potential issues may be,” said Ze Yuan, Royole’s director of R&D. “Now the situation has changed . We are ready to offer our display products, know-how, and IP for product integration. This is one area that can be built up quickly, not only for us, but also for a lot of different industries.”

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