What you should know before applying a screen protector to your foldable phone.
Screen protectors are among the first accessories many people think about when buying a new phone. It's no wonder; they're a low-cost investment to protect an expensive purchase, and nobody wants permanent scratches on their phone's glass. Screen protectors for standard phones are standardized by now, but for foldables, it's more complicated.
Not only do most foldables have two screens, but the inner screen uses technologies different from those of standard displays. Foldables are more delicate, so understandably, people want to take extra care with them.
But what about screen protectors? Can you put one on a foldable phone? The short answer is yes, but it depends on the screen. It's fine to put a protector on the outer screen, but you should avoid putting anything on the inner display.
Due to the physics involved, the inner screen of a foldable smartphone doesn't use regular, rigid glass. Instead, it relies on many flexible layers to survive hundreds of thousands of folds — and to better protect all those layers, foldable phones usually come with a built-in screen protector.
On Samsung foldable phones like the Galaxy Z Fold8 , the screen protector is made of TPU, which is flexible and specifically designed for foldable screens. The recently announced iPhone Duo , Apple's first foldable phone, also comes with a screen protector on top of the display layers. This protector also adds a nano-texture coating that gives the screen a matte finish and reduces the visibility of the crease.
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