The reason for having changes of the brightness are listed below:
1. The momentary decrease in brightness is not noticeable in normal lighting conditions and perceptible in a dark room environment. However, it does not affect the normal functionality of the device;
2. Flickering occurs only when using fingerprint unlocking in bright outdoor environments. However, it does not affect the functionality of fingerprint unlocking. There is occasional momentary flickering in bright outdoor conditions, however, it is not highly noticeable to you. There is no such issue in normal environments.