The screen above the hinge of iPhone Duo will sag and wrinkle when pressed. Apple has not said whether it affects durability.

Abstract:

Weibo user Kang recently posted a video saying that the area above the hinge of the iPhone Duo's inner screen feels soft to the touch and will sink slightly when pressed with a finger, and temporary wrinkles may appear on the surface; after removing the finger, the screen seems to return to a flat surface. Several devices are said to have the same phenomenon, but currently this is only actual user testing and social media reports. There is no independent durability test, and the device cannot be judged to be defective based on this.

Apple’s announced iPhone Duo internal screen structure shows that there are high-strength glass on the top and bottom of the panel, and the surface is covered with a scratch-resistant coating and a nano-texture polymer protective layer. Apple claims that the rigidity of this customized polymer is up to 40% higher than other materials in the industry. There is also a titanium metal plate under the screen, and the customized adhesive layer allows each layer to slide like a book page to relieve bending stress. Apple did not respond to the phenomenon of the screen becoming soft and wrinkled after being pressed.

Ice Universe, the tipster, speculates that this feel may be related to the variable thickness ultra-thin glass: thinner glass is used at the hinge to facilitate bending, and thicker on both sides to enhance strength. Corning did introduce a similar VtG glass design, but Apple has not confirmed that the iPhone Duo uses this material, so this explanation remains speculative.

This does not mean that the surface of the screen has permanent creases. User videos show that the lines formed by pressing seem to disappear after letting go; however, there are currently no public test results on whether repeated bending and long-term use will cause damage. The protective layer of the iPhone Duo's inner screen is replaceable, but this does not mean that the softness in the hinge area only involves the protective layer. The specific reason remains to be further explained by Apple.