As illustrated in FIG. 2, the method for detecting ambient light intensity may include actions illustrated in following blocks.

At block S110, a preset region of the display screen is controlled to display a predetermined picture. The preset region is a region facing the ambient light sensor in the display screen, and the predetermined picture is a pure color picture.

The preset region may be preset on the display screen of the electronic device. The preset region is the region facing the ambient light sensor in the display screen. For example, as illustrated in FIG. 6, the display region 21 of the display screen includes the preset region 23. The preset region 23 may be located at the top left corner of the display region 21. At this time, the ambient light sensor in the electronic device is set facing the preset region 23. In some embodiment, the preset region may also be located at other position in the display region 21.

The electronic device may control the display region of the display screen to display the predetermined picture. The predetermined picture is an image or a partial image preset in the electronic device. Color of any two points in the predetermined picture is the same. That is, the predetermined picture is a pure color picture, and color of all parts of the predetermined picture is the same. In some embodiments, the predetermined picture may be a full black image, and the color of the predetermined picture is black, as illustrated in FIG. 6.