iPhone Duo's screen crease is inevitable, and here's why

The iPhone Duo, Apple's folding smartphone, will inevitably develop a visible crease along its hinge over time due to fundamental physics and material fatigue, despite engineering efforts to delay it. This is an unavoidable consequence of repeated folding, not a flaw that can be permanently solved. The crease forms from progressive fatigue failure as the ultra-thin glass layers, each thinner than a human hair and coated with sliding adhesive, endure millions of micro-stresses at the hinge point. Apple's precision-engineered hinge minimizes damage by ensuring uniform folds, but micro-cracks and delamination will still accumulate, becoming visually and tactilely evident at the screen's center. Screens are typically rated for about 250,000 folds, equating to over 125 open-close cycles daily for five years. While Apple has had years to study competitors' failures, the crease's appearance is a matter of time and use, not a defect, and early reports should be monitored without hysteria.