Why does the mobile phone flash when taking pictures on the LED display?

Is caused by light reflection, the solution is as follows:

1. First, find the camera software in your mobile phone and open it, as shown in the figure below.

2. Then on the camera page that opens, find the professional mode of the menu bar and click Enter, as shown in the figure below.

3. Then, in the opened professional mode page, find and select the iso mode, as shown in the figure below.

4. Finally, in the opened page, adjust the degree, as shown in the figure below.