Folding iPhone could automatically protect itself from drops

Apple has long been researching foldable devices such as an iPhone or iPad, and has also looked at rollable screens. Each has the intention of presenting a larger display on a small device, but both can result in a screen that is potentially vulnerable to damage.

A newly-revealed patent application called "Self-Retracting Display Device And Techniques For Protecting Screen Using Drop Detection," describes ways of protecting such devices.

Whether the device folds at a hinge, or a screen can be pulled out of a base chassis, Apple proposes that the display itself can choose to break away. Instead of a possibly delicate hinge, or a fragile connection to the device, the display can detach, or fold in such a way that the screen is protected.

Specifically, it could do this when it detects the need. Which means when it detects that the device has been dropped.

"Mobile devices with foldable and rollable displays can use a sensor to detect vertical acceleration (e.g., acceleration with respect to the ground) to determine if the mobile device has been dropped," says the patent application. "If the sensor detects that the mobile device has been dropped... the foldable device can retract at least partially to afford protection from the fragile display from striking the ground."

There are then two options — retracting the screen, or releasing it.

"[For example, the process] can include activating a release mechanism for a hinged connection between a first display and a second display of the electronic device when the vertical acceleration exceeds a predetermined threshold," continues Apple, "wherein the activating reduces an angle between the first display and the second display below a threshold angle."

That proposal would clearly fit a folding iPad or iPhone where there are really two devices connected by a hinge. If that isn't possible with a specific device, Apple says it could fold the display back.

"Even folding the display to an angle less the 180 degrees can afford some protection," it says, "because the mobile device can strike edges of the mobile device instead of the display itself."

Then lastly, "a rollable device can retract the display if predetermined acceleration limits are exceeded."

This all depends, of course, on how fast the device can register a fall. It also obviously depends how high it's dropped from. So there can never be total protection against drops, but these proposals would help with foldable and rollable devices, which are necessarily more fragile than regular ones.

This patent application is credited to two inventors, Hoon Sik Kim and Michael B. Wittenberg. Both have previously worked on details for a folding iPhone, including the use of geared hinges in it.