Motorola has patented a solution for deformities in foldable phone displays4
Regardless of the flexible nature of OLED displays, folding them multiple times can ultimately lead to deformities in the flexible area of the panel. This deformity isn’t necessarily permanent, but would ultimately affect the user experience, hence the adoption of a new heat-based technology that should allow the flexible areas to be fixed immediately. Specifically, Motorola's patent, which was filed back in 2016, details the presence of a hinge that would include a temperature sensor and a heating element that can be activated in order to increase the temperature of the OLED panel around that area and allow the display to return to its usual position whenever a deformity is registered.
According to Motorola, deformities only begin to appear in the OLED panel after it’s been folded for a prolonged period of time. Because of this, the smartphone detailed in the patent also includes a special module designed specifically to track if the display is folded or not. Additionally, thanks to the inclusion of a backup battery, the module can record how long the panel has been in the folded position even when the device is switched off. Once it surpasses the predefined time limit, the smartphone display will then automatically enter recovery mode as soon as its unfolded.