The secret of crease slinging without wrinkle: Moto Razr features a unique screen hinge design

When Motorola released the Moto Razr, many people were surprised to worry that the flip-flop would leave creases like the Samsung Galaxy Hand. But in fact, the company spent four years improving screen hinge engineering to make the Moto Razr as durable as a traditional flipper. Somemedia were invited to visit the headquarters lab in Chicago, where many industrial robots conducted rigorous tests on new equipment under development.

The secret of crease slinging without wrinkle: Moto Razr features a unique screen hinge design

(Instagram via Cnet / Patrick Holland)

In November, Patrick Holland had the privilege of visiting the development iteration of the Moto Razr hinge. The flip-flops in the lab are slightly different from the finished product, but have been quite satisfying.

Motorola wants to create a slim, collapsible phone that doesn’t create permanent creases in the mid-screen. The biggest obstacle to overcome is how the screen collapses.

Flexible screens are made of thin plastic, which limits how much bending they can be made before they can fold or wrinkle. After years of testing, Motorola has determined the optimal bend without leaving a permanent crease.

This is similar to folding a piece of paper, which can cause folds if it is overdone. However, if left beyond the limit, most of the paper can still be restored to the original status of the voucher.

The secret of crease slinging without wrinkle: Moto Razr features a unique screen hinge design

To this end, Motorola chose to integrate flexible screen supports into the phone’s bottom frame. In contrast, Huawei chose a solution that placed a flexible screen outside the Mate X body.

The secret of crease slinging without wrinkle: Moto Razr features a unique screen hinge design

Like the Moto Razr, the Samsung Galaxy Fold is more like a book, but with an open space in the halfway up and down, you can see it from the latter side view.

The secret of crease slinging without wrinkle: Moto Razr features a unique screen hinge design

To accommodate the folding curves of the display, Moto Razr chose to build a special hinge on both sides of the screen, leaving some room for the shape of the screen (similar to the hinge design of a Lenovo Yoga laptop).

The secret of crease slinging without wrinkle: Moto Razr features a unique screen hinge design

The Moto Razr and Galaxy Fold are also very different in how the screen is turned on. The former uses a verticalfolded flip scheme, while the latter is a horizontal-to-fold flat scheme.

The secret of crease slinging without wrinkle: Moto Razr features a unique screen hinge design

To keep the Moto Razr completely flush when closed and avoid wedge-shaped air gaps, the company also uses steel plates that cross the width of the phone under the screen. When the phone is closed, the board slides out, leaving some room for the folding of the flexible screen.

The secret of crease slinging without wrinkle: Moto Razr features a unique screen hinge design

When the phone is open, the soleplate pushes the screen to achieve the perfect flat display. Of course, this requires a spring cam system at the edge of the screen to pull out completely if necessary. When you close your phone, you actually move up and down slightly behind your chin.

The secret of crease slinging without wrinkle: Moto Razr features a unique screen hinge design

For durability considerations, the cam section is also made of hard steel and coated with a diamond-like coating (similar to the gears on the watch, which can be moved when the phone is on and off).

In summary, the Moto Razr dispels many people’s concerns about the durability of this flip-top folding screen smartphone. As for its performance in real life, especially to prevent debris from entering the fuselage, it is still to be tested.

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