Recently, Xiaomi published a new patent (patent number 2020301357510), through which it is shown that the patent is a vertical folding mobile phone patent.
From the exposure information, the machine uses a hollow screen in the upper left corner, equipped with dual cameras and a small second screen, the SIM card slot, USB-C interface, speaker/microphone opening, etc. are placed at the bottom.
From this point of view, Xiaomi should also release vertical folding phones similar to Samsung and Huawei in the near future.
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