This is a designed feature of your phone. The screen brightness will return to normal after the phone cools down. If your phone heats up and the screen brightness automatically decreases when you are using an app, it is because the screen brightness is lowered to prevent overheating (of CPU, battery, antenna, and other components).For example, the screen brightness automatically changes when using apps such as WeChat, Browser, Contacts, and Messaging, even if automatic brightness adjustment is disabled. To save power and for an optimal user experience, the system automatically changes the screen brightness in some scenarios.For example, when scanning a QR code in Alipay, the screen brightness increases instantly. ![]() This is because the system brightness adjustment permission is open to third-party apps such as video, reader, and payment apps. The app has adjusted the screen brightness itself.If the screen brightness automatically increases or decreases when you open or exit an app, the possible causes are as follows:.(The screen brightness will decrease if the ambient light sensor is covered.) If you want the screen brightness to stay the same, open Settings, search for and touch Display & brightness/ Brightness, disable Automatic, then adjust the screen brightness to the desired level manually. ![]() You may have enabled Automatic on the brightness settings screen, resulting in the screen brightness automatically changing to a suitable level based on the environmental lighting conditions detected by the ambient light sensor on the top of the phone.Disable Zoom Filters Your iPhone brightness will be too low when Low Light is selected as the Zoom Filter. Turn off Reduce White Point, and you will instantly see that the screen gets brighter. Open the iPhone Settings app and tap on Accessibility. The screen brightness changes when the user opens, uses, or closes an app So, please take a few seconds to turn it off.
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