What is the background blackout of WeChat, telephone and SMS?

This is because the night mode of the mobile phone is on and can be turned off. Take an Android phone as an example, the specific operation steps are as follows:

1. First enter the WeChat application of the mobile phone. At this time, I found that the background color of WeChat is black, as shown in the figure below, and then I went to the next step.

2. Secondly, return to the main interface of the mobile phone, open the [Settings] software on the mobile phone, then enter the setting center, as shown in the figure below, and then enter the next step.

3. Then find 【 Display and Brightness 】 in the setting center, click to enter, as shown in the figure below, and then enter the next step.

4. Then in the display and brightness interface, drop down the menu, find 【 Night Eye Protection 】, click to enter, as shown in the figure below, and then enter the next step.

5. Then find [Screen Black and White Display] at the bottom. At this time, the display screen has been turned on, and a black background will appear when you enter WeChat, as shown in the figure below, and then go to the next step.

6. Next, slide the slider on the right to the left to turn off this function, as shown in the figure below, and then go to the next step.

7. Finally, after setting, enter WeChat again, and the WeChat interface will return to a white state, as shown in the figure below.