I’ve opened and closed foldable phones hundreds of times by now. But even after reviewing the Galaxy Fold (twice), playing with Huawei’s Mate X and bending slim concept designs, nothing has prepared me for TCL’s prototype dual-hinged phone, which folds in three parts and opens into a huge, 10-inch tablet.
The most remarkable thing about TCL’s phone is that the hinges themselves move in different directions. The DragonHinge fold in, like a book, or like the Galaxy Fold, while the Butterfly Hinge folds the opposite way.
The two hinges create a zigzag shape as you open and close the device, a silhouette in Z. It looks like an accordion. Or a taco holder. And I have to get my greedy hands on it to give it a fold, one panel at a time: Open. Folded over once. Completely folded up into a triple-stacked sandwich so that the exposed panel becomes the TCL phone’s “outer” screen. With this design, a single uninterrupted screen does it all.
more here