The idea of folding multiple folders comes back years ago, but it looks like this year will see the arrival of their advanced and advanced prototypes into the market.
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The handsets come with virtual keyboards and laptops come with a folding design. With the advent of technology, the next generation of mobile devices will have both of these features. Some may still be aware of this idea early, but a dual-mode folding mobile device does not look so unusual. Smartphone makers demand the maximum amount of space for screens, and this form factor, doubles the size of a mobile phone's display and increases the size of a small tablet.

On the other hand, tablet makers demand lightweight and portability. A dual-folding folding tablet can be folded in the middle and is easily pocketed. In addition, folding phones with dual display are highly flexible and can be used potentially in 8 different modes:
Phone Mode: By tilting the device, you can hold it to your ear and talk to the phone.

Laptop mode: By half-opening the device, its bottom to the virtual keyboard and the top to the display and the location of the apps and icons.

The book mode: The device is half-opened in the laptop mode; but by keeping the displays in portrait mode, the device turns into a book with two displays in the role of book pages.

Single-use mode with two displays: The device is either open or half-open, and each screen runs a different application. For example, the top display can display video calls and the lower screen displays the note-taking app.

Tablet Mode: With full hinge opening, the dimensions of the device are doubled and both displays become a single display, like the rest of the tablet.

Single-use marque mode: The device opens upwards of 180 degrees and the flexibility of the hinges on the screen allows the device to be tamponed. When only one display is turned on, the device turns into a regular smartphone that is positioned at an appropriate angle without the need for any other device. In this case, you can use the device with an external keyboard or only for displaying the content. You can also use the device as a bedside alert clock.

Tent and dual mode: In this case, the device opens in single-user tent mode; however, both displays will light up and display two versions of the same content. This mode provides the ability to present or announce, and both the provider and the contact can view a slide, content or video on both sides of the device.

Smartphone mode: With the full hinge open, the device can be used as a regular smartphone so that the external surfaces of the device on each other and the displays are turned in the opposite way, with two displays on the back and the other on.

The concept of folding devices with two displays is not a new idea. The pioneers of a laptop for each child are a nonprofit foundation designed to provide cheap and practical laptops and put them at the disposal of children in developing countries. About 10 years ago, the foundation developed an attractive concept called X02, which was actually a dual-screen folding machine with a small laptop size. The organization even produced an initial prototype of the device, but the idea of ​​making such a device at the time was still early and failed to obtain the necessary support. Eventually, the idea of ​​making X02 was abandoned and was forgotten.

However, from a few years ago, the idea of ​​making Android smartphones with a dual display was rumored to be limited. The Kyokra Echo (also known as the Sprint Echo) was a mobile phone sold by the Sprint Operator in the United States in the spring of 2011. The device was a small 3.5-inch 3.5-inch tablet, which turned into a device with a 4.7-inch unit display in tablet mode.

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In the same year, the idea of ​​making a smartphone called Imarj was unveiled and a prototype was designed and developed in partnership with Imerj and Fargo. The result was an Android phone with two displays and a custom interface. Imerj is far from the current standards of the mobile industry, and the two displays next to each other were a 6-inch display.

One of the most innovative dual-display devices was the Python tablet that was released 5 years ago. The displays of this device were separated from each other to the extent that the technology at that time allowed; however, there was a huge margin around them. The Python tablet at that time was a very big and expensive device as a smartphone, but with today's mobile industry standards, its size and price was quite normal.
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The commonality of these four devices is that all of them were released when technology was still not advanced. In the years to come, and especially in the year that passed, finally some of the technological advances made it possible to build folding mobile phones with dual display. The following is a description of these developments.

Better touch technology: Users need proper touch feedback when using a keyboard. A full virtual keyboard should be equipped with advanced touch technology to associate the real touch of the keyboard with the user.

Lower Thickness of Phones: By reducing the thickness of today's advanced smartphones, we can now build a device that not only does not have a normal thickness, but also has a slight thickness on both sides.

Removing Margins: This item is very important. The advancement of technology has brought us to a point where the edge of the handset will soon be completely eliminated. This feature allows dual display folding devices to take advantage of a continuous display across the entire space on both sides of the device.

True multi-tasking with high speed: Since both displays in folding devices often take two different processing processes, they require the power to perform the actual multitasking with the proper function. Thanks to Qualcomm and Intel's powerful chips, this is now possible.

Biometric authentication without the need for space occupation: Using Face Detection, such as the iPhone 5's Face Detection, or a fingerprint integrated with the display, such as Synaptic technology, allows you to use biometric authentication without having to allocate marginal space for dual-framed folding mobiles.

With the advent of technology, leading companies in this field are beginning to come up with dual-screen folding devices. All major mobile phone manufacturers have been thinking of offering such a product for many years. In the following, we will examine the performance of some companies in this regard.
Microsoft:
Redmond has recently patented for a creative hinge for a folding device. Some speculation suggests that this hinge will be for Surface von's dual display. In the same vein, a well-known Internet designer David Barrier, based on the same patent, developed the appearance of Surface phone on a rendered image and posted on Twitter
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This hinge is a creative initiative, because by opening the device, both displays turn into a single display and there is almost no distance between them.

If you remember, Microsoft in 2009, with the concept of a folding tablet with a dual touch-based touchpad called Courier, attempted to create a new wave in the technology world. Courier was not an all-in-one device, but according to a video of how it was released, Microsoft dreamed of making a device with special features like note-taking.
Google
Last month, Google patented for a very different tablet with two displays. Google's initiative to create such a tablet is somewhat strange and, of course, innovative. The two displays of the device can be separated from each other and used as a separate tablet. However, the two displays, when connected to each other, make up a single tablet with a screen size of twice the size. In addition, the bottom display can also be used as a virtual keyboard and a touchpad. When connecting two displays, they both take advantage of each other's power and charge them with a charging connection.

Samsung:
Rumors say the Korean giant at the 2018 CES will unveil a dual-folding smartphone. The company has reportedly been working on folding handsets for many years, and it's likely that they will eventually come up with a real example of it in the first half of this year.

However, another strong possibility is that Samsung's device is not a folding phone like we've seen before, but it's likely they're going to reshuffle their flexible phone. The hinges of the device can be placed under a flexible and continuous display, which opens up a thin, thin handset.

However, there is the possibility of Samsung taking advantage of its other patents, or even such a device may not be introduced at this time.

ZTE
The only company that has ever been able to build the most complete and most commercially folding machine is the Chinese company. In October, the company unveiled a product called Axon M, a dual-display phone. Exxon has two 5.2-inch displays and can be used in laptops, tablets or tents. The innovative way to make this folding device is to use Exxon One as a camera for normal shooting, selfie shooting or video calling. The HTC Desire has a 20 megapixel camera.
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Nevertheless, one half of the phone is more thick than the other half, and the overall thickness becomes too large when closed. So, my Exxon might look like some elementary device. Also, the displays of this handset are not facing inside but are closed out. As a result, instead of placing screens on each other and preventing falling lines and scratches and stains on them, both of them are closing each other and are in danger of injury.

In addition, the displays of this device are not without margins; as a result, they are not exactly one-to-one in the middle, and when there is a gap between them there is a thin margin. This distance does not mean that the device is not connected continuously when using the phone, and the sensation of arresting a single device is not instructed by the user.

However, the quest to build a real folding device and pave the way for other actors is worthy of praise.

Apple
Lastly, the latest company is Co-op. Apple has its own patents for dual-screen folding devices. Samsung's patents refer to a flexible display device like Samsung's patents.

Goodbye with the tablet
The tablets will continue to be with us right now, but if dual-core folding handsets become mainstream, the tablet will gradually shrink, with digital personal assistants and pocket computers being replaced.

However, the demand seems to remain on the market for advanced and expensive tablets such as iPad Pro or low-cost tablets such as the Amazon Fire. But the market for tablet devices would be to grab folding smartphones with a dual display because they could be used as tablets at any time. As a result, in the lead year, the first wave of folding handsets will come with a dual display, and at the same time, tablets will gradually lose their popularity and influence.