As technology advances, display manufacturers have found ways to increase the amount of flex that can be safely built into the screen. It definitively addresses the durability issue, allowing the screen to bend thousands of times without breaking.
Manufacturers have been playing around with folding screens for over a decade, but the first foldable phones didn’t come out until 2019. There’s a reason folding screens take so much time to mature. More precisely, there are several reasons for this.
Flexible substrates are only part of the equation. Scientists and engineers have had to solve incredibly difficult problems, such as manufacturing substrates that are lightweight and flexible, yet capable of withstanding years of mechanical stress. Ensure that all bends and folds do not affect image quality over time. creating an equally flexible protective layer for the screen; Make sure all other technologies that go into the display are still working. With all this work done, other smart people had to come up with a way to incorporate a flexible display into a foldable phone while maintaining the incredibly high standards we expect from electronics. It is indeed very difficult.
Before looking at the individual components of a foldable screen, it’s important to note that all foldable screens you see on the market today are various OLEDs. OLED screens do not have a backlight like LCDs. Instead, when power is applied, the pixel itself emits light. Because of this, OLED can be made about 30% thinner and lighter than LCD. Along with other advantages over LCDs, OLEDs are the first choice for flexible screens, but flexible LCD displays do exist.
To understand how a foldable OLED display works, it is useful to visualize the display as a very thin (possibly tasteless) layer cake. These layers are stacked together in very thin packages that are millimetres thick.