Group 1 - The article discusses the recent trend in the smartphone industry, where major Chinese brands are shifting from curved screens back to flat screen designs [2][3] - Xiaomi initiated this trend with its Xiaomi 13 series, gradually moving towards flat screen solutions [2][3] - Other brands like OPPO and vivo have also adopted flat screens in their flagship models, such as the Find X8 and X200 series [2][3] Group 2 - The latest models released, including Huawei Mate 80, Xiaomi 17, OPPO Find X9, and vivo X300 series, all feature flat screen designs [2][3] - Previously, Huawei exclusively used curved screens across its entire Mate 40 series lineup [2][3]