Foldable phones with heavy hinges and a permanent crease down the screen will look as dated as button Nokias in a couple of years. Engineers decided bending a display in half is a dead end and moved to a scroll. In place of Fold and Flip lines comes a concept where a huge panel winds onto an internal drum and slides out of the body. So far only Samsung has shown a project of that kind.
How the Samsung Rollable works
Instead of folding the screen in half and leaving an ugly dent at the bend, engineers hid part of the OLED matrix inside the chassis. The display is wound on a compact drum with a micro motor.
Press a button and the motor gently pushes the side frame out. A compact phone becomes a full 10-inch tablet with 16:9 proportions and a sharp 440 ppi image. The open screen is completely flat: no grooves, creases, or glare bands down the middle.
The engineering trick
The biggest problem with current clamshells is thickness when closed. In jeans they feel like two phones glued together. Samsung Rollable handles that neatly.
Leaks suggest the camera block sits on the moving part of the body. When the phone rolls back to compact mode, the bulky camera module does not smash into a folded screen. It slots into a recess on the main frame. The gadget stays thin while still holding the slide mechanism and a sizable battery.
Goodbye, hinges
The main pain of today’s foldables is fragile hinges. Dust, sand, and pocket grit jam them, and the fold loosens over time.
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On a rollable phone dirt has nowhere to pack in: the display rides on guides, and the bend radius on the inner drum is kept gentle so organic LEDs are not stressed. You get a neat hybrid: a comfortable everyday slab that can unroll into a big screen for movies and games.
