What are Foldable Phones?
Precursors to the concept have used multiple touchscreen panels on a hinge in a similar manner, but contemporary designs utilise a flexible display. Concepts of such devices date back as early as Nokia's "Morph" concept in 2008, and a concept presented by Samsung Electronics in 2013 (as part of a larger set of concepts utilizing flexible OLED displays), while the first commercially available folding smartphones with OLED displays began to emerge in November 2018.
The first generation of commercially-released foldable smartphones faced concerns over their durability, as well as their high prices.
History:
The Kyocera Echo was a precursor to the current generation of foldable smartphones.
In 2006, Polymer Vision showed a roll-able concept and a foldable smartphone, the Readius, at the Mobile World Congress (MWC) which also serves as a reader.
In 2008, Nokia presented animated concepts of a flexible device it dubbed "Morph", which had a tri-fold design that could be bent into various forms, such as a large unfolded device, a feature phone-sized unit, and a smart wristband. In a 2019 retrospective on the concept, CNET noted that Morph could be considered a forerunner to the first wave of commercially produced folding phones, as well as a showcase of future possibilities.
In 2011, Kyocera released a dual-touchscreen Android smartphone known as the Echo, which featured a pair of 3.5-inch touchscreens. When folded, the top screen continued to face the user while covering the secondary screen. Two individual apps could be shown on the displays, a single app could span across them, while specific apps also featured "optimized" two-pane layouts. Two years later, NEC released the Medias W in Japan. Unlike the Echo, the secondary screen could be folded behind the phone. The camera rotated with the screen so that the same sensor could face both forward and rear In 2017, ZTE released the Axon M with a similar hinge to the Medias W. ZTE stated that the more powerful hardware of modern smartphones, and improvements to multitasking and tablet support on Android, helped to improve this experience.
The development of thin, flexible OLED displays enabled the possibility for new designs and form factors. During its Consumer Electronics Show keynote in 2013, Samsung presented several concepts—codenamed Youm—for smartphones incorporating flexible displays. One such concept was a smartphone that could fold outward into a single, uninterrupted tablet-sized display. The first Youm concept to make it to a production model was the Galaxy Note Edge—a phablet with a portion of the screen that sloped over the right-hand bezel.
Speculation surrounding the development of folding phones using OLED displays began to emerge more rapidly in 2018. In January 2018, it was reported that LG Electronics had obtained a design patent for a folding smartphone. Later in June, it was reported that Microsoft had been developing a similar device as part of its Surface line, codenamed "Andromeda" (itself a spiritual successor to a dual-screen booklet tablet prototype Microsoft had been exploring in the late-2000s known as Courier), while Samsung was also said to be developing such a device.
In January 2019, Xiaomi CEO Lin Bin published a video on Sina Weibo, featuring him demonstrating a prototype smartphone with two flaps capable of being folded inward. Samsung officially unveiled the Galaxy Fold during its media event at Mobile World Congress in February 2019. Alongside the Galaxy Fold, the convention also saw other foldable phones being unveiled or teased, such as the Huawei Mate X, and TCL presenting various prototype concepts featuring its "DragonHinge" technology (including a bracelet-styled device).LG did not unveil a folding device, citing a desire to focus more on regaining market share in the smartphone market. It did, however, unveil a "Dual Screen" case accessory for its LG V50 smartphone—a folio-styled case containing a secondary display panel inside.
Other companies expressed interest in the concept, or have received patents on designs (such as hinge implementations and overall designs) relating to foldable phones. Motorola Mobility had received patents for a horizontal folding smartphone reminiscent of clamshell feature phones.
In April 2019, the impending launch of the Galaxy Fold was met with quality concerns from critics, after widespread reports of review units experiencing varying forms of display failure (in some instances caused by accidental removal of a plastic layer meant to protect the screen instead of glass, along with other failures). Samsung indefinitely postponed the device's release, stating that it needed time to investigate the failures and improve the device's durability Huawei also delayed its Huawei Mate X, with the company citing its desire to take a "cautious" approach due to the Samsung Galaxy Fold.
In November 2019, Motorola unveiled its horizontal-folding Razr—inspired by its former Razr feature phone line released on 6 February 2020. Samsung also announced a similar device known as the Galaxy Z Flip. Huawei announced the Mate Xs on 24 February 2020 as a hardware revision of the original Mate X; it was released in "global markets" outside China in March 2020. The device features a more durable display, improved hinge function and a redesigned cooling system, as well as the newer Kirin 990 5G SoC and Android 10 with EMUI 10. Samsung later revealed the Samsung Galaxy Z Fold 2 in September 2020. In January 2021, Apple tested its two foldable-iPhone prototypes at the Foxconn factory in China.[39] On 25 February 2021, Huawei released the Huawei Mate X2. In March 2021, Xiaomi Technology announced the Xiaomi Mi MIX Fold.
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