Industry News

Why the foldable screen can bend and stretch?

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Author : KTBABA-JUN
Update time : 2021-08-19 15:31:37
In the evolution of smart phones, from narrow bezels to curved screens and today's full-screen display, people never stopped to chase for a larger display area.

Except the LCD notch screen and the water drop screen , there are still sliding covers, mechanical structures and other methods to create a full-screen display effect. The hole-digging screen is also on the way to the market. Even through these structure’s screens can reach 100% full-screen display, but due to the volume of the mobile phone, The size of the screen is limited in 7 inches, so how to break through this limit?

Yes, it is time to use a foldable screen to achieve the effect of widening the screen.


 

How is the folding screen made? KTBABA also makes research on emerging technologies and plans for the future lcd market.

 

The biggest feature of curved OLED screens is that they can be bent, but whether it is a curved TV or a curved screen mobile phone, the curved screen is not bent at a large angle.

 

If the bending angle can reach 180°, what will happen?
 

Therefore, what we call a folding screen mobile phone requires that the screen of the mobile phone be bent enough to be 180 degrees so that it can be stacked together, and it must be able to be closed and opened at will. The folding screen can be regarded as an upgraded version of the curved OLED screen. Through the bendable display area, the mobile phone can be closed and opened at will, which not only controls the volume of the mobile phone, but also obtains a larger display area.
 

However, it is not easy to make a foldable screen. Thing to be clear here is that the screen we see is not a simple unit At this stage, OLEDs are mainly composed of a substrate, an anode, a conductive layer, a light-emitting layer, and a cathode.
 

OLEDs are stacked into several ultra-thin layers on a glass or plastic substrate, with multiple layers of organic compounds sandwiched between two electrodes (cathode and anode). When voltage is applied to the electrode, electrons from the cathode and holes (positive charges) from the anode attract each other and meet in the light-emitting layer. When electrons and positive holes recombine, the OLED emits light, releasing energy in the form of photons.


 

To put it simply, it means that the components and structure of the screen can be folded. The previous screen design is definitely not good, especially the glass that cannot be bent at will as the screen substrate, so we need to use plastic material.
 

The characteristics of plastic make it the most suitable substrate material for foldable screens. It not only enables the substrate to be folded, but also improves the drop resistance of the screen, and at the same time makes the screen lighter and thinner. The lightness and thinness of the plastic material is also the advantage of the folding OLED screen. The 1.2g~1.4g/cm2. Compared with the glass material, the weight of the mobile phone is greatly reduced.



However, there are still worrying factors of the folding screen. High-frequency folding is bound to put more severe requirements on the life of the hinge. In addition, whether the hinge design can fit the two screens together is also of concern to consumers. In the next time , KTBABA will have an in-depth understanding of the development trend of folding screens of various brands in the market.

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