The phone screen suddenly turned dark?

1. Opening and exiting the application, or the screen brightness automatically changes during use of the application

1. It may be because you have turned on the automatic brightness adjustment switch. After turning it on, the phone will automatically adjust the brightness according to the top The ambient light sensor determines the current ambient light brightness and automatically adjusts the screen brightness to make you feel more comfortable when using it (when the ambient light sensor is blocked, the screen brightness will decrease), this is normal. If you want the screen brightness to remain unchanged when using your phone, please search and enter Display and Brightness/Brightness in settings, turn off the automatic adjustment switch, and adjust the screen brightness to the brightness you need.

2. If the screen brightness automatically dims when you open and exit the application, it may be that in order to reduce the power consumption of the mobile phone, the system appropriately reduces the brightness for some application scenarios, which reduces display and power consumption. Better overall experience. For example, when you open WeChat, browser, contacts, SMS and other applications, the brightness will be automatically adjusted even if you turn off automatic brightness adjustment. This is designed for ease of use, please feel free to use it.

3. If your phone heats up and the screen brightness automatically dims while you are using the app, it is because the phone appropriately lowers the brightness to avoid overheating (CPU, battery, antenna, etc.) to reduce heat generation. , it will return to normal screen brightness after the temperature drops. This is designed for ease of use on mobile phones, please feel free to use it.

2. Turn on the automatic brightness adjustment, the screen brightness is relatively dark

Please follow the following methods to troubleshoot:

1. Check the location of the ambient light sensor on the phone Is there any film or foreign objects blocking it?

2. In a dim environment or a single light source environment, the brightness of the environment recognized by the mobile phone is relatively low, so the system brightness adjustment is darker. It is recommended that you manually adjust the brightness to a suitable brightness.

3. Check the ambient light sensor. If the following phenomena occur, please back up important data (third-party applications such as QQ and WeChat need to be backed up separately), and bring your purchase receipt to the Huawei Customer Service Center for maintenance. Turn off the automatic screen brightness adjustment switch, and the screen brightness will change automatically; turn on the automatic screen brightness adjustment switch, and the screen brightness will switch back and forth significantly under a fixed light source (such as a flashlight).

3. Turn off the automatic brightness adjustment. In an environment with strong lighting, the brightness of the mobile phone screen will automatically change. When the mobile phone sensor senses that the external light reaches a certain intensity, it will automatically increase the screen brightness to ensure that you can see clearly. mobile phone screen. This is a normal phenomenon, please feel free to use it. To protect your eyesight, it is recommended that you avoid using your phone under strong light for long periods of time.

4. When the ambient light sensor position is blocked, the screen brightness does not automatically adjust to the minimum.

In order to avoid the brightness drop caused by accidentally blocking the light sensor, the system optimizes the backlight adjustment strategy. Screen brightness will not be reduced to minimum when the sensor is blocked. If you need to adjust the brightness to the minimum, you can drag the brightness adjustment button to the left by pulling down the notification bar.

5. After the call is completed, the phone moves away from the ear, and the screen lights up slowly (not applicable to HUAWEI Mate40)

In order to prevent the proximity light sensor from mistakenly detecting that the phone is far away from the phone, causing a call During the process, the screen lights up and power consumption increases. The phone has an anti-shake function. After the call ends, the screen will slowly light up while the phone is away from the ear.

Warm reminder: After the eye protection mode is turned on, the screen will switch between white and yellow during use of the phone, which may be mistaken for a change in screen brightness.

Related links are as follows: Huawei Customer Service Center Repair Service Appointment Service Repair Spare Parts Price Inquiry