Apple is continuing to develop unconventional display technology that can be folded and unfolded along hinge junctions, possibly for future foldable iPhones. In a patent application for an electronic device with a foldable extended display, apple described the hinge structure in more detail. The first figure in the patent, first filed in February 2020, details a folding device bent at right angles. The figure seems to show a new multi link hinge structure with more than one contact point. According to the patent text < / P > < p > the hinge structure may include gear teeth, belts and / or other motion synchronous structures, as well as components that move relative to each other during bending. These moving members may be subject to bars and links with opposing bending bearing surfaces, including stop surfaces that prevent excessive rotation of the rods and links relative to each other. These links can be rotated around pivot points located within the display without the actual hinge structure placed inside the display. < / P > < p > the patent also relates to other expandable or slide out displays, pointing out that the shell structure supporting folding, sliding, rolling and / or other behaviors can provide users with more screen space in a compact size. In addition, the patent also relates to some methods for preventing the display screen from over stress during folding and unfolding, including specific hinge types, stress minimization components, stop surfaces, and control of friction applied to the hinges. < / P > < p > Apple also doesn’t limit display technology to the iPhone. It points out in the patent that foldable or extensible devices can be applied to a range of different device types, including embedded kiosk systems, bicycles, wristbands, laptops, glasses and devices in vehicles, etc. Apple submits many patents every week, but it doesn’t mean that these technologies will eventually enter the market commercially. Global Tech