Since the iPhone 6 series in 2014, Apple has been using 2.5D glass design on the screen glass cover to match the sleek design of the phone's curved middle frame, making the transition between the screen surface and the middle frame perfect and smooth. This design continues even in the full screen era.

However, this year's iPhone 12 series may change. Recently, a Twitter account named Apple Lab posted that all iPhone 12 series models will use 100% straight glass panel design instead of 2.5D glass that has been extended for many generations.

This tweet didn't reveal any more information, but considering that all kinds of revelations and existing models point to the flat middle frame design of the iPhone 12 series that will return to the iPhone 4 era, it would be rather stiff to add 2.5D glass in the design. After all, from iPhone 4 to iPhone 5s, flat glass panels are used.

After the iPhone 5s, the number of mobile phones with flat middle frame+flat glass panel that are still in the process of doing is probably the previous hammer mobile phone. Now there are even fewer in the market. At present, most of the high-end models in the Android camp have turned to curved screen design. It seems that Apple wants to take the lead in being a "sharp alien" after being "slick" for a long time.

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